How to Choose a TVS Diode Manufacturer: Compare VRWM, Clamping Voltage and Pulse Waveforms

A TVS diode manufacturer should be evaluated through part-level data, test conditions and supply documentation—not through a brand ranking. Start with the maximum continuous line voltage, then compare reverse stand-off voltage, breakdown voltage, clamping voltage, peak pulse current, waveform, package and current product status.

Direct answer: shortlist manufacturers only after their candidate parts can be compared at the same electrical and pulse conditions. A lower clamping-voltage number is not automatically better if it was measured at a different current, waveform or temperature.

What the manufacturer question must resolve

“Which TVS diode manufacturer is best?” is too broad for component approval. The engineering question has three parts:

1. What normal-voltage and transient window must the protected line tolerate?

2. Which complete ordering codes meet that window under comparable conditions?

3. Can the supplier provide current datasheets, samples, lot traceability and change information?

A manufacturer name can organize the approved-vendor list, but the technical decision must identify the exact part number and datasheet revision.

Compare these eight fields under the same conditions

Nexperia's TVS selection paper starts with reverse stand-off voltage and then checks breakdown voltage, surge current, waveform and clamping voltage. Littelfuse datasheets likewise define VR, VBR, VC and leakage at specific test points. These sources support one practical rule: every number needs its operating or test condition beside it.

A six-step manufacturer-selection workflow

1. Define the continuous line maximum. Include tolerance, ripple, hot-plug behavior and normal bidirectional swing.

2. Define the threat waveform. Do not substitute an 8/20 μs current rating for a 10/1000 μs requirement.

3. Estimate current through the TVS. Include source impedance, upstream protection, cable impedance and PCB path.

4. Check residual voltage. Read VC near the expected current and verify the protected circuit can tolerate it.

5. Review thermal and repetitive stress. Check derating, board copper, pulse interval and the specified number of events.

6. Run controlled A/B tests. Use the same PCB, cable, generator settings, operating mode and pass/fail criteria.

If two candidates share the same VRWM but publish VC at different currents or waveforms, mark the comparison as incomplete. Do not fill the missing condition by estimation.

How public manufacturer data should be used

A product matrix is useful for screening; a current part datasheet is required for approval. The ASIM TVS matrix exposes fields including package, peak pulse power, VRWM, VBR, IPP, VC and IR in one selection view. That makes it possible to narrow a domestic candidate list without claiming that the matrix alone proves superiority.

The next step is to download the selected part's datasheet and compare it with alternatives from other manufacturers under the same test conditions. ASIM's practical advantage here is data-screening efficiency and the connection between component selection and EMC application support. Final approval still depends on the target board and documented tests.

Example: screening for a nominal 24 V power line

The nominal 24 V label is not enough to choose VRWM. First record the highest continuous voltage created by tolerance, charging, ripple and allowed operating states. Then identify the surge waveform and estimate how much current reaches the TVS after source impedance and upstream elements are considered.

• Reject candidates whose VRWM does not cover the documented continuous maximum.

• Compare VBR only with its specified test current.

• Compare VC at a relevant IPP and the same waveform.

• Verify that the residual voltage, including layout overshoot, stays within the downstream limit.

• Confirm package, pad layout, derating and product status before ordering samples.

This procedure produces a traceable shortlist. It does not produce a universal ranking, because another power architecture may have a different continuous maximum, source impedance and downstream tolerance.

Supplier evidence beyond the electrical table

• Complete ordering code and marking rules;

• Current datasheet plus revision history or product-change channel;

• Package drawing, recommended land pattern and reflow information;

• Sample and production-lot traceability;

• Quotation date, quantity, taxes, lead time and validity period when price is discussed;

• A defined path for failure analysis and part substitution.

Public web pages will not always provide every item. Missing evidence should be requested from the supplier and recorded as pending rather than inferred.

Frequently asked questions

Can TVS manufacturers be ranked by peak pulse power?

No. Peak pulse power depends on pulse waveform, temperature and package conditions. VRWM, VBR, VC, IPP, leakage, polarity and derating must also match the application.

Is a domestic TVS diode directly interchangeable with an imported part?

Not from a cross-reference label alone. Compare complete ordering codes and electrical conditions, then verify surge behavior, leakage, thermal performance and the target-board layout.

Does an IEC 61000-4-2 component result guarantee system compliance?

No. A component test describes the component under stated conditions. System performance also depends on discharge path, PCB parasitics, enclosure, cables, operating mode and the applicable product standard.

Sources

• ASIM TVS product matrix: package, PPPM, VRWM, VBR, IPP, VC and IR fields

• Nexperia: What are TVS diodes and how do you choose the right one?

• Littelfuse TPSMC-VR series datasheet

Sources checked on September 22, 2026. Recheck product status and archive the current datasheet revision before approving a part.