CN218482243U - Bidirectional TVS device - Google Patents
Bidirectional TVS device Download PDFInfo
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- CN218482243U CN218482243U CN202222664795.9U CN202222664795U CN218482243U CN 218482243 U CN218482243 U CN 218482243U CN 202222664795 U CN202222664795 U CN 202222664795U CN 218482243 U CN218482243 U CN 218482243U
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- transient voltage
- voltage suppression
- chip
- lead frame
- suppression chip
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Abstract
The utility model discloses a two-way TVS device, its first transient state voltage restraines the chip, second transient state voltage restraines the chip and is located the support base region, and the positive pole of first transient state voltage restraines the chip, the negative pole of second transient state voltage restraines the chip is connected with the support base region electricity of first lead frame, an electrode zone that is located the support base region top connection piece and the negative pole of first transient state voltage restraines the chip, the positive pole electricity connection of second transient state voltage restraines the chip, the weld end and the second lead frame one end electricity of connection piece are connected, a narrow strip portion has between the weld end of connection piece and the electrode zone, the weld end width of this connection piece is less than the width of electrode zone, the width of narrow strip portion is less than the width of the weld end of connection piece, the thickness of this narrow strip portion is less than the electrode zone of connection piece and the respective thickness of weld end. The utility model discloses two-way TVS device had both realized 2 ascending surge voltage clamps of side, had avoided TVS to exceed the abnormal conditions that the bearing capacity short circuit of itself arouses the product burning again.
Description
Technical Field
The utility model relates to a semiconductor device technical field especially relates to a two-way TVS device.
Background
The bidirectional TVS device is also called as a transient suppression diode, is used for absorbing surge power, can bear reverse voltage impact in a very short time, enables a voltage clamp between two electrodes to be positioned at a specific voltage, and avoids the impact on a rear circuit. The bidirectional TVS device clamps the voltage to a predetermined level suitable for ac circuits.
After the current surge of the existing bidirectional TVS device is short-circuited, if the time is relatively long, new potential safety hazards, such as abnormal conditions of combustion, easily exist, and therefore, a bidirectional TVS device is needed to solve the technical problems.
Disclosure of Invention
The utility model aims at providing a two-way TVS device, this two-way TVS device had both realized 2 ascending surge voltage cramps of side, can thereby avoided TVS to exceed the abnormal conditions that the bearing capacity short circuit of itself arouses the product burning again, had improved the security of using greatly.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a bidirectional TVS device, comprising: the first transient voltage suppression chip and the second transient voltage suppression chip are positioned on the supporting base region, and the anode of the first transient voltage suppression chip and the cathode of the second transient voltage suppression chip are electrically connected with the supporting base region of the first lead frame,
an electrode area of a connecting sheet positioned above the support base region is electrically connected with a negative electrode of the first transient voltage suppression chip and a positive electrode of the second transient voltage suppression chip, a welding end of the connecting sheet is electrically connected with one end of the second lead frame, and the other ends of the first lead frame and the second lead frame extend out of two ends of the epoxy resin packaging body;
a narrow strip is arranged between the welding end of the connecting piece and the electrode area, the width of the welding end of the connecting piece is smaller than that of the electrode area, the width of the narrow strip is smaller than that of the welding end of the connecting piece, and the thickness of the narrow strip is smaller than that of the electrode area and the welding end of the connecting piece.
The further improved scheme in the technical scheme is as follows:
1. in the scheme, the thickness of the narrow strip part is 1/3~1/4 of the thickness of the electrode area and the welding end of the connecting sheet.
2. In the above solution, the central region of the electrode region has 2 bosses facing the first transient voltage suppression chip and the second transient voltage suppression chip, respectively.
3. In the above scheme, the bottom surface of the epoxy resin package body has an outer convex layer.
4. In the above scheme, the first transient voltage suppression chip, the second transient voltage suppression chip and the first lead frame are connected through the first solder paste layer.
5. In the scheme, the connecting sheet is connected with the second lead frame through the second soldering paste layer.
Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:
the utility model discloses two-way TVS device, it is located first transient voltage suppression chip, the second transient voltage suppresses and has a narrow strip portion between the welding end of chip top connection piece and the electrode zone, the welding end width of this connection piece is less than the width of electrode zone, the width of narrow strip portion is less than the width of the welding end of connection piece, the thickness of this narrow strip portion is less than the respective thickness of electrode zone and welding end of connection piece, when the failure mode of TVS device is the short circuit, the TVS device plays and surpasss TVS self bearing capacity and after the short circuit, the narrow strip portion of connection piece can break off immediately, thereby avoided TVS to surpass the abnormal situation that self bearing capacity short circuit arouses the product burning, the security that uses in some industry products that high reliability requires such as automotive electronics, medical industry has been improved greatly; and the anode of the first transient voltage suppression chip and the cathode of the second transient voltage suppression chip are electrically connected with the support base region of the first lead frame, and the electrode region of the connecting sheet positioned above the support base region is electrically connected with the cathode of the first transient voltage suppression chip and the anode of the second transient voltage suppression chip, so that surge voltage clamping in 2 directions is realized, and the number of protected electronic equipment is further increased.
Drawings
Fig. 1 is a top view of the overall structure of the bidirectional TVS device of the present invention;
fig. 2 is a schematic diagram of the internal structure of the bidirectional TVS device of the present invention;
fig. 3 is a transverse sectional front view of the bidirectional TVS device of the present invention;
fig. 4 is a longitudinal sectional front view of the bidirectional TVS device of the present invention.
In the above drawings: 1. a transient voltage suppression chip; 2. a first lead frame; 201. a support base region; 3. a second lead frame; 4. connecting sheets; 401. an electrode area; 402. welding the end; 5. an epoxy resin package; 6. a narrow strip portion; 7. a second transient voltage suppression chip; 8. a convex layer; 91. a first solder paste layer; 92. a second solder paste layer.
Detailed Description
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1: a bidirectional TVS device comprising: the device comprises a first transient voltage suppression chip 1, a second transient voltage suppression chip 7, a first lead frame 2 and a second lead frame 3 with a supporting base region 201 at one end;
the first transient voltage suppression chip 1 and the second transient voltage suppression chip 7 are positioned on the support base region 201, and the anode of the first transient voltage suppression chip 1 and the cathode of the second transient voltage suppression chip 7 are electrically connected with the support base region 201 of the first lead frame 2;
an electrode area 401 of a connecting sheet 4 positioned above the supporting base region 201 is electrically connected with the cathode of the first transient voltage suppression chip 1 and the anode of the second transient voltage suppression chip 7, a welding end 402 of the connecting sheet 4 is electrically connected with one end of the second lead frame 3, and the other ends of the first lead frame 2 and the second lead frame 3 extend out of two ends of the epoxy resin packaging body 5;
a narrow strip part 6 is arranged between the welding end 402 and the electrode region 401 of the connecting sheet 4, the width of the welding end 402 of the connecting sheet 4 is smaller than that of the electrode region 401, the width of the narrow strip part 6 is smaller than that of the welding end 402 of the connecting sheet 4, and the thickness of the narrow strip part 6 is smaller than that of the electrode region 401 and the welding end 402 of the connecting sheet 4 respectively.
The width of the narrow strip part is smaller than the width of the welding end of the connecting sheet, the thickness of the narrow strip part is smaller than the thickness of the electrode area and the welding end of the connecting sheet, the current passing capacity of the narrow strip part is smaller than the thickness of the welding end and the welding end of the connecting sheet, when the failure mode of the TVS device is short circuit, the TVS device acts when the upper limit of the current passing through the narrow strip part is lower than the upper limit of the current passing through the narrow strip part, if the current after the short circuit exceeds the bearing capacity of the TVS, the narrow strip part of the connecting sheet can be immediately disconnected, and therefore the abnormal condition that the TVS exceeds the bearing capacity of the TVS and causes product combustion due to short circuit is avoided.
The thickness of the narrow strip portion 6 is 1/3 of the thickness of the electrode portion 401 and the welding end 402 of the connecting piece 4.
The width of the narrow strip portion 6 is 1/4 of the width of the welding end 402 of the connecting piece 4.
The central region of the electrode region 401 has 2 bumps facing the first tvs 1 and the second tvs 7, respectively.
The first tvs 1, the second tvs 7 and the first lead frame 2 are connected to each other by a first solder paste layer 91.
The connecting sheet 4 and the second lead frame 3 are connected by a second solder paste layer 92.
The first solder paste layer 91 and the second solder paste layer 92 are solder paste layers.
The narrow strip portion 6 is a copper narrow strip portion.
Example 2: a bidirectional TVS device, comprising: the device comprises a first transient voltage suppression chip 1, a second transient voltage suppression chip 7, a first lead frame 2 and a second lead frame 3 with a supporting base region 201 at one end;
the first transient voltage suppression chip 1 and the second transient voltage suppression chip 7 are positioned on the support base region 201, and the anode of the first transient voltage suppression chip 1 and the cathode of the second transient voltage suppression chip 7 are electrically connected with the support base region 201 of the first lead frame 2,
an electrode area 401 of a connecting sheet 4 positioned above the supporting base region 201 is electrically connected with the cathode of the first transient voltage suppression chip 1 and the anode of the second transient voltage suppression chip 7, a welding end 402 of the connecting sheet 4 is electrically connected with one end of the second lead frame 3, and the other ends of the first lead frame 2 and the second lead frame 3 extend out of two ends of the epoxy resin packaging body 5;
a narrow strip part 6 is arranged between the welding end 402 and the electrode area 401 of the connecting sheet 4, the width of the welding end 402 of the connecting sheet 4 is smaller than that of the electrode area 401, the width of the narrow strip part 6 is smaller than that of the welding end 402 of the connecting sheet 4, and the thickness of the narrow strip part 6 is smaller than that of the electrode area 401 and the welding end 402 of the connecting sheet 4 respectively.
The thickness of the narrow strip portion 6 is 1/4 of the thickness of the electrode region 401 and the welding end 402 of the connecting piece 4.
The width of the narrow strip portion 6 is 1/5 of the width of the welding end 402 of the connecting piece 4.
The bottom surface of the epoxy resin package 5 has an outer convex layer 8.
The narrow portion 6 is an aluminum narrow portion.
The first tvs 1, the second tvs 7 and the first lead frame 2 are connected to each other by a first solder paste layer 91.
The connecting sheet 4 and the second lead frame 3 are connected by a second solder paste layer 92.
The first solder paste layer 91 and the second solder paste layer 92 are copper solder paste layers.
The utility model discloses the theory of operation of two-way TVS device is as follows, it has a narrow strip portion between the welding end of the connection piece that is located transient voltage suppression chip top and the electrode region, the welding end width of this connection piece is less than the width of electrode region, the width of narrow strip portion is less than the width of the welding end of connection piece, the thickness of this narrow strip portion is less than the respective thickness of electrode region and welding end of connection piece, because the ability of passing through the electric current of narrow strip portion is less than the welding end and the electrode region of connection piece, when the failure mode of TVS device is the short circuit, the TVS device plays a role when narrow strip portion passes through below the upper limit of electric current, if the electric current exceeds TVS self bearing capacity after the short circuit, the narrow strip portion of connection piece can break off immediately, thereby avoided TVS to exceed the abnormal situation that self bearing capacity short circuit arouses the product burning, the security that the industry product that has improved some high reliability requirements such as automotive electronics, medical industry uses greatly; and the anode of the first transient voltage suppression chip and the cathode of the second transient voltage suppression chip are electrically connected with the support base region of the first lead frame, and the electrode region of the connecting sheet positioned above the support base region is electrically connected with the cathode of the first transient voltage suppression chip and the anode of the second transient voltage suppression chip, so that surge voltage clamping in 2 directions is realized, and the number of protected electronic equipment is further increased.
When the patch type semiconductor device is adopted, surge voltage clamping in 2 directions is realized, the number of protected electronic equipment is further increased, and when the failure mode of the TVS device is short circuit, if the current after the short circuit exceeds the bearing capacity of the TVS, the abnormal condition that the TVS exceeds the bearing capacity of the TVS to cause product combustion can be avoided, and the safety of products in certain industries with high reliability requirements, such as automobile electronics and medical industries, is greatly improved.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (6)
1. A bidirectional TVS device, characterized by: the method comprises the following steps: the structure comprises a first transient voltage suppression chip (1), a second transient voltage suppression chip (7), a first lead frame (2) and a second lead frame (3) with a supporting base region (201) at one end, wherein the first transient voltage suppression chip (1) and the second transient voltage suppression chip (7) are positioned on the supporting base region (201), and the anode of the first transient voltage suppression chip (1) and the cathode of the second transient voltage suppression chip (7) are electrically connected with the supporting base region (201) of the first lead frame (2);
an electrode area (401) of a connecting sheet (4) positioned above the supporting base region (201) is electrically connected with the negative electrode of the first transient voltage suppression chip (1) and the positive electrode of the second transient voltage suppression chip (7), the welding end (402) of the connecting sheet (4) is electrically connected with one end of a second lead frame (3), and the other ends of the first lead frame (2) and the second lead frame (3) extend out of the two ends of the epoxy resin packaging body (5);
a narrow strip part (6) is arranged between the welding end (402) and the electrode area (401) of the connecting piece (4), the width of the welding end (402) of the connecting piece (4) is smaller than that of the electrode area (401), the width of the narrow strip part (6) is smaller than that of the welding end (402) of the connecting piece (4), and the thickness of the narrow strip part (6) is smaller than the thickness of the electrode area (401) and the welding end (402) of the connecting piece (4).
2. A bidirectional TVS device as recited in claim 1, wherein: the thickness of the narrow strip part (6) is 1/3~1/4 of the thickness of the electrode area (401) and the welding end (402) of the connecting sheet (4).
3. The bidirectional TVS device of claim 1, wherein: the central area of the electrode area (401) is provided with 2 bosses respectively facing the first transient voltage suppression chip (1) and the second transient voltage suppression chip (7).
4. The bidirectional TVS device of claim 1, wherein: the bottom surface of the epoxy resin packaging body (5) is provided with an outer convex layer (8).
5. The bidirectional TVS device of claim 1, wherein: the first transient voltage suppression chip (1), the second transient voltage suppression chip (7) and the first lead frame (2) are connected through a first solder paste layer (91).
6. The bidirectional TVS device of claim 1, wherein: the connecting sheet (4) is connected with the second lead frame (3) through a second welding paste layer (92).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222664795.9U CN218482243U (en) | 2022-10-10 | 2022-10-10 | Bidirectional TVS device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222664795.9U CN218482243U (en) | 2022-10-10 | 2022-10-10 | Bidirectional TVS device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218482243U true CN218482243U (en) | 2023-02-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222664795.9U Active CN218482243U (en) | 2022-10-10 | 2022-10-10 | Bidirectional TVS device |
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| Country | Link |
|---|---|
| CN (1) | CN218482243U (en) |
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- 2022-10-10 CN CN202222664795.9U patent/CN218482243U/en active Active
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