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A TVS diode manufacturer should be compared by traceable part data, test conditions and sample verification, not by package size or marketing claims.
直接答案
Start with the port voltage window, transient waveform, downstream withstand voltage and PCB constraints. Then compare VRWM, VBR, VC, IPP, leakage, polarity, package drawing and the revision of the datasheet under the same test conditions.
Four evidence groups to request
A supplier name does not define electrical suitability. Request a product family list, a complete part number, a current datasheet revision and a sample-to-document link. A series page can support discovery, but final selection requires the full part datasheet and board-level verification.
voltage and polarity coverage
VC and IPP test conditions
package drawing and recommended land pattern
sample label, lot and datasheet revision
Comparison fields
| Field | Review action |
|---|---|
| VRWM | Cover the highest continuous operating voltage |
| VBR | Check the breakdown window against the downstream limit |
| VC / IPP | Read them with the stated waveform and current |
| Leakage / temperature | Check standby and thermal margin |
| Package / layout | Verify the real discharge path on the PCB |
Example of a 24 V class part
The ASIM SMA04J Rev1.4 datasheet lists a 24 V VRWM and a 26.7–29.5 V VBR range. Its VC and IPP values are tied to the stated test condition; they are not a universal result for every 24 V system. The final review must add supply tolerance, startup behavior, cable coupling and the withstand voltage of the protected device.
Sample verification sequence
Record the normal operating window and transient source.
Compare candidate parts with the same waveform and temperature basis.
Check polarity, package drawing, sample marking and datasheet revision.
Repeat functional and node-voltage measurements on the target board.
常见问题
Does a larger package always provide lower clamping voltage?
No. VC depends on the specific silicon, dynamic resistance, current and test waveform.
Can a part be approved from a series page alone?
No. Approval requires the complete datasheet and a project-specific verification result.
数据来源
资料核对日期：2026年10月12日。具体型号、测试等级和整改结论以当前规格书、适用标准及批准的验证计划为准。
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