CN201985103U - Low-leakage solid discharge tube - Google Patents
Low-leakage solid discharge tube Download PDFInfo
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- CN201985103U CN201985103U CN2011200297787U CN201120029778U CN201985103U CN 201985103 U CN201985103 U CN 201985103U CN 2011200297787 U CN2011200297787 U CN 2011200297787U CN 201120029778 U CN201120029778 U CN 201120029778U CN 201985103 U CN201985103 U CN 201985103U
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- discharge tube
- solid discharge
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Abstract
The utility model provides a low-leakage solid discharge tube. The low-leakage solid discharge tube comprises a shell made of an encapsulating material, a wafer in the shell, a first electrode and a second electrode, wherein both the first and the second electrodes extend into the shell and are in electric connection with the wafer. The low-leakage solid discharge tube is further provided with a P-type protection wall arranged in the wafer. The solid discharge tube has low current leakage and low cost, has the finished product ratio of above 98 percent through improvement on a conventional solid discharge tube, has the same manufacturing cost as a solid discharge tube adopting a planar structure, and has leakage current of below 1uA.
Description
Technical field
The utility model belongs to the circuit protecting element technical field, particularly a kind of low electric leakage solid discharging tube.
Background technology
Discharge tube is a kind of high voltage protective element that is used in the equipment input, if when the voltage at its two ends exceeds its protection specification value, short circuit phenomenon can appear in its inside, and sponges the high pressure of crossing of input.Anti-over-voltage protector commonly used in the modem electronic circuitry mainly contains four kinds: gas discharge tube, avalanche silicon diode (TVS), metal oxide piezo-resistance (MOV) and solid-state transient voltage suppressor (being commonly called as solid discharging tube).
Solid discharging tube is semiconductor discharge tube again, is a kind of over-voltage protector, utilizes the thyristor principle to make, and relies on the breakdown current trigger device conducting discharge of PN junction, can flow through very big surge current or pulse current.The scope of its puncture voltage has constituted the scope of overvoltage protection.Solid discharging tube can directly be connected across the two ends of protected circuit when using.
Solid discharging tube is widely used in stored-program control exchange, telephone set, facsimile machine, distributing frame, XDSL, communication interface, communication transmitter in the communication exchange device etc., and all need the field of lightning protection, avoid the impact and the destruction of transient overvoltage to protect its inner IC.In today of world today's microelectronics and communication apparatus high speed development, solid discharging tube has become the first-selected device of WorldCom's equipment.
Existing solid discharging tube is to be used for information transmission equipment or the instantaneous overvoltage of system and the protective devices that thunder and lightning disturbs such as communication terminal, modulator-demodulator, distributing frame.It has that volume is little, response is fast, can the recovery type puncture, the short circuit type protection, absorb advantages such as surge capacity is strong, replaces widely used gas discharge tube just rapidly.Present stage, domestic most of solid discharging tube mainly adopts two kinds of structures: planar structure and mesa structure.Planar structure is owing to exist semiconductor device unavoidable " beak " phenomenon, produce " brill is scurried " effect, make some foreign ions " brill is scurried " in the oxide layer arrive chip internal, form partial ionization at the PN junction place, charge carrier " transition energy " reduces, and becomes more active, increased the transport capacity of electric current, thereby make leakage current increase, so (leakage current of 220V～400V) is very big, generally greater than 50uA for the high pressure solid discharge tube.
And mesa structure has increased by 1 photoetching (glassivation groove), 1 diffusion (glass dust filling), 1 oxidation (formation of insulating oxide) owing to adopt technology for passivating glass (GPP), thereby makes production cost improve 15～20%.In the forming process of glassivation groove, because under aging, the operative employee's of tapping machine, icking tool technical merit, the multiple factor effect of chip internal stress, the probability that the edge of chip bursts apart can improve 10%, make rate of finished products can only guarantee more than 85%, so the rate of finished products of high pressure solid discharge tube can only accomplish generally more than 85% that cost improves 15～20% than planar structure.
So be necessary to design a kind of low electric leakage cheaply solid discharging tube remedy above-mentioned defective.
The utility model content
The technical problems to be solved in the utility model is to overcome many deficiencies of the prior art, a kind of low electric leakage solid discharging tube cheaply is provided, the utility model passes through the fixedly improvement of discharge tube, make rate of finished products can reach more than 98%, production cost is identical with planar structure, and the leakage current of product can be accomplished below the 1uA.
The utility model provides a kind of low electric leakage solid discharging tube; it comprises the housing that is made of encapsulating material, brilliant unit, first electrode, second electrode that is positioned at described housing; described first electrode and described second electrode all stretch in the described housing; and be electrically connected with described brilliant unit; described fixedly discharge tube further is provided with P type protection wall, and it is located in the described brilliant unit.
The utility model solid discharging tube is provided with P type protection wall in described brilliant unit, promptly spread a wide 20um around active area, " the protection wall " of dark 20um, and diffusion material P, concentration is 10 Ω/.Can be controlled at the charge carrier more than 90% a fixing area of isolation like this, greatly reduce the quantity of free carrier, reduce the electric current transport capacity, thereby reduced leakage current.Because this step diffusion is carried out simultaneously with diffusion of active area, compare with planar structure, without any cost increase.In addition,, can adopt higher temperature to carry out the sintering (1200 ℃) of PN junction, make that PN junction can faster moulding, reduce pre-expansion and time of distribution again, improve rate of finished products because the quantity of free carrier reduces.
Description of drawings
Accompanying drawing 1 is the schematic diagram of the low electric leakage of the utility model solid discharging tube.
Embodiment
Below in conjunction with Figure of description, the utility model is described further.
Preferably; as shown in Figure 1; a kind of low electric leakage solid discharging tube 1; it comprises the housing 2 that is made of encapsulating material, brilliant unit 3, first electrode (not shown), second electrode (not shown) that is positioned at described housing; described first electrode and described second electrode all stretch in the described housing 2; and be electrically connected with described brilliant unit 3, described fixedly discharge tube 1 further is provided with P type protection wall 4, and it is located in the described brilliant unit 3.
The utility model solid discharging tube is provided with P type protection wall in described brilliant unit, promptly spread a wide 20um around active area, " the protection wall " of dark 20um, and diffusion material P, concentration is 10 Ω/.Can be controlled at the charge carrier more than 90% a fixing area of isolation like this, greatly reduce the quantity of free carrier, reduce the electric current transport capacity, thereby reduced leakage current.Because this step diffusion is carried out simultaneously with diffusion of active area, compare with planar structure, without any cost increase.In addition,, can adopt higher temperature to carry out the sintering (1200 ℃) of PN junction, make that PN junction can faster moulding, reduce pre-expansion and time of distribution again, improve rate of finished products because the quantity of free carrier reduces.
The low electric leakage of the utility model solid discharging tube is compared with known solid discharging tube, has following advantage:
1, compares with the solid discharging tube of planar structure, on the basis that does not increase cost, guaranteed rate of finished products, and leakage current is reduced to below the 1uA by 50uA more than 98%.
2, compare with the solid discharging tube of mesa structure, leakage current is reduced to below the 1uA by 5～20uA, cost reduces by 15～20%, and rate of finished products improves more than 10%.
Embodiment only is a preferred optimum implementation of the present utility model in sum; unintelligible is that protection range of the present utility model is limited; for adjustment that does not exceed technical solutions of the utility model and the change that the technical work personnel of this area are done according to the utility model present embodiment, should think and drop in the protection range of the present utility model.
Claims (1)
1. one kind is hanged down the electric leakage solid discharging tube; it comprises the housing that is made of encapsulating material, brilliant unit, first electrode, second electrode that is positioned at described housing; described first electrode and described second electrode all stretch in the described housing; and be electrically connected with described brilliant unit; it is characterized in that: described low electric leakage fixedly discharge tube further is provided with P type protection wall, and it is located in the described brilliant unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200297787U CN201985103U (en) | 2011-01-28 | 2011-01-28 | Low-leakage solid discharge tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200297787U CN201985103U (en) | 2011-01-28 | 2011-01-28 | Low-leakage solid discharge tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201985103U true CN201985103U (en) | 2011-09-21 |
Family
ID=44612559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200297787U Expired - Fee Related CN201985103U (en) | 2011-01-28 | 2011-01-28 | Low-leakage solid discharge tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201985103U (en) |
-
2011
- 2011-01-28 CN CN2011200297787U patent/CN201985103U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20120128 |