CN209496880U - Transient Suppression Diode - Google Patents
Transient Suppression Diode Download PDFInfo
- Publication number
- CN209496880U CN209496880U CN201822222383.3U CN201822222383U CN209496880U CN 209496880 U CN209496880 U CN 209496880U CN 201822222383 U CN201822222383 U CN 201822222383U CN 209496880 U CN209496880 U CN 209496880U
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- tvs chip
- tvs
- chip
- pin
- transient suppression
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Abstract
The utility model discloses a kind of Transient Suppression Diodes, including pin, encapsulating housing and at least one TVS chip, pin and TVS chip weld, a part and TVS chip of pin are located in the encapsulating housing, and the TVS chip, which is equipped with to be looped around around TVS chip welding region, refuses layer.The utility model has the advantages that avoid in welding short-circuit because caused by being spread scolding tin.
Description
Technical field
The utility model relates to technical field of semiconductors, a kind of specific Transient Suppression Diode.
Background technique
Transient Suppression Diode (TVS) is a kind of device for protecting sensitive semiconductor, makes sensitive semiconductor from wink
A kind of solid-state semiconductor device that state voltage surge destroys, it have that clamp coefficient is small, small in size, response is fast, leakage current is small and
High reliability, thus be widely used on voltage transient and carrying out surge protection.Static discharge (ESD) and its
His some transient voltages occurred at random in the form of voltage surge, are typically found in various electronic devices, and semiconductor devices
Increasingly miniaturization, high density and multi-functional feature, so that electronic device becomes increasingly susceptible to the influence of voltage surge, even
Lead to fatal harm.
Existing Transient Suppression Diode includes TVS chip and the pin with the welding of TVS chip, TVS chip and pin
After welding, then it is packaged using black glue.However, being in molten state in welding region when welding TVS chip and pin
Under scolding tin readily diffused into except the welding region of permission in welding, therefore, scolding tin after diffusion and pad are linked to be one
After body, it be easy to cause the short circuit of circuit.
Utility model content
This practical new purpose is to provide a kind of Transient Suppression Diode of avoidable short circuit.
Realize that the technical solution of above-mentioned purpose is as follows:
Transient Suppression Diode, including pin, encapsulating housing and at least one TVS chip, pin and TVS chip weld
It connects, a part and TVS chip of pin are located in the encapsulating housing, and the TVS chip, which is equipped with, is looped around the welding of TVS chip
Layer is refused around region.
The width for refusing layer is 0.3-0.5mm.
Refuse the edge that layer extends to TVS chip using the edge of welding region as starting point.
The TVS chip be it is multiple, two neighboring TVS chip welding region by welding is attached.
The pin includes weld part and extension, and one end of weld part and one end of extension connect, weld part it is another
One end is the free end welded with TVS chip, and weld part is tapered, shape between the circumferential surface of weld part and one end of weld part
At angle be 30 to 34 degree.
In the present invention, except thering is scolding tin to be diffused into the welding region of TVS chip it after, refuses layer and plays to make to spread
The effect be isolated with the circuit of TVS chip of scolding tin, prevent the scolding tin of diffusion from causing short circuit.Therefore, the utility model ensures
Short circuit caused by will not being spread because of scolding tin when welding.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the schematic diagram of the pin in the utility model；
Fig. 3 is the schematic diagram of the TVS chip in the utility model.
Specific embodiment
As shown in Figure 1 to Figure 3, the Transient Suppression Diode of this practical new type, including pin 1, encapsulating housing 2 and extremely
A few TVS chip 3, pin 1 and TVS chip 2 weld, and a part and TVS chip 2 of pin 1 are located at the encapsulating housing 3
Interior, shell 3 is made using the black glue of environmentally friendly low stress.The TVS chip 2 is equipped with and is looped around 2 welding region of TVS chip
Layer 2b is refused around 2a, the width for refusing layer 2b is 0.3-0.5mm, and 0.4mm is selected in the breadth-first for refusing layer 2b.It refuses to weld
Layer 2b is to use oxide layer obtained from oxidation processes on the surface of TVS chip 2, when the welding for having scolding tin to be diffused into TVS chip 2
Except the 2a of region and layer 2b is refused in arrival, is refused layer 2b and is played the role of that the scolding tin of diffusion is isolated with the circuit of TVS chip 2,
Prevent the scolding tin of diffusion from causing short circuit.Refuse the edge that layer 2b extends to TVS chip 2 using the edge of welding region 2a as starting point.
As shown in Fig. 2, the pin 1 includes weld part 1a and extension 1b, one end of weld part 1a is with extension 1b's
The other end of one end 1c connection, weld part 1b is the free end welded with TVS chip 2, and weld part 1b is tapered, weld part
The angle α formed between one end 1c of the circumferential surface 1d and weld part 1b of 1b is 30 to 34 degree, and angle α preferentially uses 32 degree, is used
The angle α of this shape and 30 to 34 degree, it is possible to reduce scolding tin diffusion avoids causing the short circuit on chip.
As shown in Figure 1, the TVS chip 2 be it is multiple, two neighboring TVS chip 2 welding region 2a by welding carry out
Connection.After multiple TVS chips 2 are overlapped, the voltage carrying capacity of Transient Suppression Diode can be promoted, is tested by experiment
Card, after multiple TVS chips 2 are superimposed, voltage carrying capacity is up to 1200V.Two TVS chips 2 use chip solid-state welding
Tap into capable welding.
Claims (5)
1. Transient Suppression Diode, including pin, encapsulating housing and at least one TVS chip, pin and TVS chip weld,
A part and TVS chip of pin are located in the encapsulating housing, which is characterized in that the TVS chip is equipped with and is looped around TVS
Layer is refused around chip welding region.
2. Transient Suppression Diode according to claim 1, which is characterized in that the width for refusing layer is 0.3-0.5mm.
3. Transient Suppression Diode according to claim 1, which is characterized in that refusing layer with the edge of welding region is
Point extends to the edge of TVS chip.
4. Transient Suppression Diode according to claim 1, which is characterized in that the TVS chip be it is multiple, it is two neighboring
TVS chip is attached in welding region by welding.
5. according to claim 1 to Transient Suppression Diode described in one of 4, which is characterized in that the pin includes weld part
And extension, one end of weld part and one end of extension connect, the other end of weld part is oneself welded with TVS chip
By holding, weld part is tapered, and the angle formed between the circumferential surface of weld part and one end of weld part is 30 to 34 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822222383.3U CN209496880U (en) | 2018-12-28 | 2018-12-28 | Transient Suppression Diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822222383.3U CN209496880U (en) | 2018-12-28 | 2018-12-28 | Transient Suppression Diode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209496880U true CN209496880U (en) | 2019-10-15 |
Family
ID=68155007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822222383.3U Active CN209496880U (en) | 2018-12-28 | 2018-12-28 | Transient Suppression Diode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209496880U (en) |
-
2018
- 2018-12-28 CN CN201822222383.3U patent/CN209496880U/en active Active
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