WO2005088483A1 - 電子パッケージ信頼性予測装置および電子パッケージ信頼性予測プログラム - Google Patents
電子パッケージ信頼性予測装置および電子パッケージ信頼性予測プログラム Download PDFInfo
- Publication number
- WO2005088483A1 WO2005088483A1 PCT/JP2005/001782 JP2005001782W WO2005088483A1 WO 2005088483 A1 WO2005088483 A1 WO 2005088483A1 JP 2005001782 W JP2005001782 W JP 2005001782W WO 2005088483 A1 WO2005088483 A1 WO 2005088483A1
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- Prior art keywords
- evaluation
- simulation
- electronic package
- result
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/18—Chip packaging
Definitions
- the present invention relates to an electronic package reliability prediction device and an electronic package reliability prediction program for predicting the reliability of an electronic package at the stage of designing the electronic package.
- CSP Chip size Package: LSI package with almost the same outer dimensions as a chip
- the solder joints of electronic packages such as these BGA package CSPs are usually called “micro joints”.
- the solder joints of these electronic packages are exposed to stress such as temperature change and drop impact, the electronic package including the above solder joints must be applied to actual products. It is necessary to fully evaluate the overall strength reliability.
- CAE Computer Aided Engineering: Design of industrial products
- FEM Simulation finite element analysis
- Patent Literature 1 and Patent Literature 2 below various techniques have been conventionally considered for performing high-speed simulation of the strength evaluation of the entire electronic package.
- Patent Document 1 discloses a method of analyzing a semiconductor package mounting structure in which a thermal strain simulation and a life prediction of a solder joint are analyzed accurately in a short time using a structural model in which a BGAZCSP is mounted on a printed wiring board. Have been.
- this method of analyzing a semiconductor knockout mounting structure the life of a solder joint of an electronic package is predicted by performing a simulation using a two-dimensional plane model.
- a technique for predicting life by ordinary two-dimensional analysis is known, and is disclosed in Patent Document 1. Adjusts the setting of the thickness direction parameter for 2D analysis to match the actual phenomenon.
- Patent Document 2 when the life expectancy of an electronic package is predicted by three-dimensional analysis, a rough analysis of the analysis model is performed by a coarse model in order to perform the three-dimensional analysis more accurately and efficiently.
- IC An IC package analysis method is disclosed in which an attention area is determined by this rough analysis, a detailed model is created, and a high-precision analysis is performed at high speed by analyzing the detailed model.
- Patent Document 1 JP-A-2000-304630
- Patent Document 2 JP-A-2000-99550
- a general designer or a factory worker can easily evaluate the strength of an electronic package without performing a simulation by using an analysis result performed by an expert, and It is an object of the present invention to provide an electronic package reliability prediction device and an electronic package reliability prediction program capable of predicting reliability.
- the present invention provides an electronic package reliability prediction device including the following means.
- a package modeling database having data relating to the shape of an electronic package and modeling specifications of the electronic package
- Parameter setting means for accepting input of parameters for the type, dimensions, material selection and evaluation conditions of the electronic package, and characteristics of the material specified by the input parameters.
- Modeling means for generating a simulation model based on the reliability data and the parameters of the dimensions of the electronic package,
- Simulation execution means for executing a simulation under specified conditions specified by the input parameters based on the simulation model generated by the modeling means
- Simulation result evaluation means for storing and accumulating, in an evaluation result database, the above input parameters and the evaluation results obtained by evaluating the simulation results for each type of the electronic package.
- An evaluation formula generating means for generating an approximate expression of the evaluation result with respect to the input parameters for the plurality of evaluation results stored in the evaluation result database in a predetermined amount, and using the approximate expression as an evaluation formula
- An electronic package reliability prediction unit comprising: an evaluation prediction unit that outputs an evaluation prediction result by the evaluation expression when an electronic package in which the evaluation expression is already constructed is designated by the input parameters.
- An apparatus is provided.
- the evaluation formula generation means has a function of updating the evaluation formula every time the simulation is performed and the simulation result is added.
- the electronic package reliability prediction apparatus of the present invention uses an orthogonal polynomial based on an experimental design for generating an initial evaluation formula with respect to the construction of the above evaluation formula. Updates are now based on least squares.
- the present invention provides a computer having a package modeling database having data relating to the shape of an electronic package and modeling specifications of the electronic package, and a material database having characteristic data of the material of the electronic package.
- Parameter setting means for receiving input of parameters of the type, dimensions, material selection and evaluation conditions of the electronic package;
- a simulation execution means for executing a simulation under specified conditions specified by the above-mentioned input parameters based on the generated simulation model; and a simulation result obtained as a result of the above-mentioned simulation being set to a predetermined evaluation condition.
- a simulation result evaluation means for evaluating and evaluating the simulation results based on each of the electronic package types and storing and storing the input parameters and the evaluation results obtained by evaluating the simulation results in an evaluation result database.
- An evaluation formula generating means for generating an approximate expression of the evaluation result with respect to the input parameters for the plurality of evaluation results stored in the evaluation result database in a predetermined amount, and using the approximate expression as an evaluation formula
- the parameter setting unit, the modeling unit, the simulation execution unit, the simulation result evaluation unit, the evaluation formula generation unit, and the evaluation prediction unit that constitute the electronic package reliability prediction device of the present invention described above include:
- the program may be stored in a storage unit such as a RAM (random 'access' memory) or a ROM (read-only memory) of the computer in advance, and may be configured by a program.
- the parameter setting means, the modeling means, the simulation executing means, the simulation result evaluating means, the evaluation expression generating means, and the evaluation predicting means execute a program stored in a storage part of the computer in advance by a CPU of the computer. (Central Processing Unit: Central Processing Unit) and so on.
- FIG. 1 is a block diagram showing a basic configuration of the present invention.
- FIG. 2 is a conceptual diagram showing an example of division by a standard mesh when evaluating a solder joint by a finite element method.
- FIG. 3 is an input screen diagram showing a first example (part 1) of an input screen when parameter input is performed interactively.
- FIG. 4 is an input screen diagram showing a first example (part 2) of an input screen in the case of interactively inputting parameters.
- FIG. 5 is an input screen diagram showing a second example (part 1) of an input screen in the case of interactively inputting parameters.
- FIG. 6 is an input screen diagram showing a second example (part 2) of an input screen in the case of interactively inputting parameters.
- FIG. 7 is a conceptual diagram showing an example of automatic generation of a simulation model by a finite element method.
- FIG. 8 is a schematic diagram showing an example of calculating a fatigue life cycle.
- FIG. 9 is a schematic diagram showing an example of parameters input to generate an approximate evaluation expression.
- FIG. 10 is a graph showing an example of evaluation results of a fatigue test of a solder joint.
- FIG. 11 is a graph showing a relationship between a fatigue life cycle and a strain amplitude.
- FIG. 1 is a block diagram showing a basic configuration of the present invention
- FIG. It is a conceptual diagram which shows the example of division
- the configuration of the electronic package reliability prediction device according to the present invention is shown in a simplified manner.
- the package modeling database 1 that holds data on the shape of the electronic package and the modeling specifications of the electronic package, and the physical properties (material properties) of the materials of the electronic package.
- a material property database 2 that has data is prepared.
- the number of electronic packages to be evaluated is limited to several representative packages, and the package modeling database 1 is configured.
- FC—BGA Flip-Chip BGA
- OMPAC Over Molded Pad Array Carrier
- FBGA Full Molded Pad Array Carrier
- EBGA Enhanced BGA
- TabBGA Tape-Automated Bonding BGA
- Flip—Chip—C4 flip chip C4 and the like.
- the modeling method of various electronic packages that the simulation specialist has been modeling is classified, and important modeling techniques that affect the simulation result evaluation are standardized in advance.
- the finite element method which is a typical simulation method
- the entire region of the simulation model is divided into a plurality of sub-regions called meshes.
- the simulation result obtained as a result of performing the simulation is affected by the size of the sub-region at the time of division by the mesh, that is, the mesh size. Therefore, it is necessary to standardize the mesh size of an important point in performing the reliability evaluation in advance.
- FIG. 2 illustrates a mesh size of a standard mesh when the solder joint of the electronic package is evaluated by the finite element method.
- the solder joints Sl, ..., S4, ..., S7, ..., SN between the pad PA and the solder SO in Fig. 2, each standard mesh , Where N is any positive integer
- each standard mesh Where N is any positive integer
- each standard mesh Where N is any positive integer
- the enclosure is determined in advance. If a value outside the valid range is specified, the system should output a warning message to prevent the wrong range from being entered.
- the material property database 2 shows the material properties such as the elastic modulus (Young's modulus) and the coefficient of linear expansion of the material constituting the electronic package, which are necessary for the simulation of the reliability evaluation.
- Data material property values are set for all defined materials and stored in advance.
- the parameter setting means 3 receives the input (A) of the type, dimensions, material selection, and evaluation conditions of the electronic package, and the package modeling database 1 and the material The necessary data is extracted from the physical property database 2 and passed to the modeling means 4.
- the above parameter setting means 3 can be configured by a predetermined program built in a computer system. As shown in Fig. 3 to Fig. 6 below, inputting the parameters as described above can be performed easily and without error if the user and the input screen are interactively performed.
- FIGS. 3 and 4 are input screen diagrams showing the first and second examples of the first example of the input screen in the case of interactively inputting the parameters.
- FIGS. 5 and 6 show the parameter screens.
- FIG. 9 is an input screen diagram showing first and second examples of a second example of the input screen in the case where the input is performed interactively.
- the input screen shown in Fig. 3 is an example of the start screen, and the user can create a new database or click on an existing link by clicking on the link displayed as "User power ⁇ New" or "Existing". You can specify whether to open the database.
- the input screen shown in Fig. 4 is a screen for specifying the type of package to be analyzed from the displayed electronic packages after opening the existing database. In the example of FIG. 4, one of “C type BGA”, “Tape BGA”, and “EBGA” is specified by the user from the types of the BGA package.
- the input screen of FIG. 5 is an example of a sequential, interactive input screen for parameters of dimensions (Dimensions) representing characteristics of components of the electronic package and load conditions.
- the user sequentially and interactively inputs the specified dimensions (width W, length L and thickness T) of the specified knock target for evaluation for each target load with reference to the displayed sample diagram.
- Load conditions such as temperature and load Cases are also defined interactively.
- the material names of the material data retrieved from the material property database 2 are displayed (for example, AL, AL203, ALC, ALLOY42, and ALN).
- the user interactively selects the materials (e.g., ALLOY42) for the components of the electronic package to be evaluated with reference to the material names of the material data displayed on the input screen in Fig. 6 to obtain the material property database. Make an interactive choice from 2.
- material property data such as the elastic modulus (Young's modulus), Poisson's ratio, and coefficient of thermal expansion of the material selected by the user are extracted from the material property database 2 and displayed.
- the modeling means 4 generates the simulation model (B) based on data specified by the user (for example, dimensional parameters and material property data of the electronic package specified by the user). Generate.
- the above-mentioned modeling means 4 can be constituted by a predetermined program built in the computer system.
- the simulation executing means 5 executes the simulation based on the simulation model (B) generated by the modeling means 4 under the conditions specified by the user.
- the above-mentioned simulation executing means 5 can be constituted by a predetermined simulation program built in the computer system.
- Figure 7 below shows a sample of automatic generation of a simulation model by the finite element method.
- FIG. 7 is a conceptual diagram showing an example of automatic generation of a simulation model by the finite element method.
- the three-dimensional simulation model in Fig. 7 is automatically created by dividing the structure including the solder joints of the electronic package to be evaluated into multiple meshes using the aforementioned modeling means 4 (Fig. 1). It has been generated.
- a simulation can be executed on the simulation model generated in this manner by using, for example, a structural analysis simulator such as a finite element method solver.
- evaluation criteria evaluation conditions
- the evaluation method of the simulation result (C) obtained as a result of performing the simulation by the simulation executing means 5 referring to past simulation cases.
- Set the evaluation criteria in advance It is desirable. For example, regarding the evaluation of simulation results in places where stress concentrates and the simulation results fluctuate extremely, such as the joint interface of solder joints, the simulation results (C) in the area 100 m from the interface are considered. Average.
- evaluation criteria such as fracture / fatigue life are set in advance. For example, the destructive stress at the joint interface between the pad and the solder is defined as 100MPa (megapascal).
- Such evaluation criteria are stored in a database and compiled as an evaluation criteria database 9.
- the simulation result evaluation means 6 evaluates a simulation result obtained as a result of the simulation based on the above evaluation criteria.
- the above-described simulation result evaluation means 6 can be configured by a predetermined program built in a computer system. For example, when the failure determination is performed by the simulation result evaluation means 6, the presence or absence of breakage of the electronic package is determined, and when calculating the fatigue life of the electronic package, the number of fatigue life cycles is determined, and the screen is displayed. To be displayed.
- FIG. 8 is a schematic diagram showing an example of calculating a fatigue life cycle.
- the simulation result evaluation means 6 determines the input parameter and the simulation result.
- the data on the evaluation results such as stress, strain, and fatigue life cycle, etc., which are evaluated by the above, are registered in the evaluation result database (D).
- the evaluation formula generation means 7 in Fig. 1 calculates the combined power S of the input parameters and the simulation evaluation result data for the same type of electronic package, and the number of input parameters.
- the evaluation expression generating means 7 can be constituted by a predetermined program built in a computer system.
- FIG. 9 is a schematic diagram showing an example of parameters input to generate an approximate evaluation formula.
- the approximate evaluation formula for example, the evaluation formula of the maximum stress (evaluation stress) SA generated in the sample of the no-metal electronic package having the two-layer structure force shown in Fig. 9 is taken.
- the maximum stress SA at this time is expressed as a function of each input parameter as follows.
- equation (1) Since the inputtable range of each input parameter is limited to some extent, it is possible to approximate equation (1) with a second-order polynomial (orthogonal polynomial) approximately as follows.
- SA a + ax + ax 2 + by + by 2 +----+ d ⁇ ⁇ + d ( ⁇ ⁇ ) 2 (2)
- a, a, a, b, b, '.', D, and d are unknown coefficients. According to equation (2), if a combination of the number of input parameters equal to the number of unknown coefficients and the evaluation result SA is obtained, the unknown coefficients can be uniquely determined. When a combination exceeding the number of unknown coefficients is obtained, the unknown coefficients can be estimated with high accuracy by a method such as the least squares method.
- the evaluation predicting means 8 sets the evaluation expression ((E) when an electronic package of a type in which a similar evaluation expression has already been constructed is specified by the parameter input by the user. Predict the result using E).
- the prediction result predicted by the evaluation formula (E) is output from the evaluation prediction means 8 (predicted output (F) in FIG. 1). If a predetermined number of data are accumulated in the evaluation result database (D) and an evaluation formula based on the data is already created, it is possible to predict stress, strain, fatigue life cycle, etc. with a certain degree of accuracy. Can be. As a result, it is possible to obtain an evaluation result with a certain degree of accuracy without performing a simulation that requires a long calculation time.
- the above-described evaluation prediction means 8 can be configured by a predetermined program built in a computer system.
- FIG. 10 is a graph showing an example of evaluation results of a fatigue test of a solder joint
- FIG. 11 is a graph showing a relationship between a fatigue life cycle and a strain amplitude.
- a white dot indicates the relationship between the fatigue life cycle Nf and the strain amplitude ⁇ (the change in strain amplitude per cycle of the fatigue life cycle Nf).
- the dots in the black circles are the results of the thermal fatigue test, plotted in the relationship between the fatigue life cycle Nf and the strain amplitude ⁇ .
- the white square dots indicate the three-point bending fatigue
- the evaluation results of the test (BGA assembly) are plotted in the relationship between the fatigue life cycle Nf and the strain amplitude ⁇ .
- the graph of Fig. 11 illustrates the relationship between the fatigue life cycle (cycle) and the strain amplitude (absolute value).
- the white triangular dots show the calculated values of the strain amplitude m) based on the analysis values obtained by evaluating the simulation results.
- the white square dot indicates the value (mm) of the strain amplitude based on the evaluation formula (approximation formula) using an approximate straight line. It is calculated. If a plurality of evaluation results are accumulated in the evaluation result database (D) by a predetermined amount, it can be understood that the values on both graphs almost match.
- the electronic package reliability estimating apparatus of the present invention it is possible to obtain a constant and stable evaluation result by evaluating the simulation result, and further, it is possible to obtain a material characteristic, a simulation or the like by a user. It is possible to evaluate an electronic package only with knowledge of the package structure of the electronic package without requiring special knowledge of the electronic package. On the other hand, for electronic packages for which approximate evaluation formulas have already been constructed, it is possible to obtain evaluation results with a certain degree of accuracy in a very short time without performing a simulation.
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JP2006510886A JP4500308B2 (ja) | 2004-03-10 | 2005-02-07 | 電子パッケージ信頼性予測装置および電子パッケージ信頼性予測プログラム |
US11/509,615 US7467076B2 (en) | 2004-03-10 | 2006-08-25 | Apparatus for predicting reliability in electronic device package, program for predicting reliability in electronic device package, and method for predicting reliability in electronic device package |
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JP2004-067116 | 2004-03-10 | ||
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US11/509,615 Continuation US7467076B2 (en) | 2004-03-10 | 2006-08-25 | Apparatus for predicting reliability in electronic device package, program for predicting reliability in electronic device package, and method for predicting reliability in electronic device package |
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CN116341471B (zh) * | 2023-03-30 | 2023-11-24 | 广西中科蓝谷半导体科技有限公司 | 一种半导体功率器件特性的版图结构仿真设计方法 |
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JP4500308B2 (ja) | 2010-07-14 |
JPWO2005088483A1 (ja) | 2008-01-31 |
US20060294436A1 (en) | 2006-12-28 |
US7467076B2 (en) | 2008-12-16 |
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