Protective Component products

Unidirectional TVS Diodes

A unidirectional TVS conducts hard in one direction and blocks in the other, which suits DC rails that never go negative. Set the standoff voltage above the worst-case rail including ripple, then confirm the clamping figure at your surge current.

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Unidirectional TVS Diodes product selection results
Part number	Datasheet	Compare	Downloads	Polarity	Vrwm/V	Vesd Air/Vesd Contact	Cj/pf	Package	Operating Temperature
WHALD03G4U	SPEC	Compare WHALD03G4U	PDF	ESD	3.3	±15KV/±12KV	0.3	DFN2510-10L	-40 °C to 125 °C
WHALD30E2B	SPEC	Compare WHALD30E2B	PDF	Bi-Directional ESD	30	±30KV/±30KV	0.9	SOT-23	-40 °C to 125 °C
WHTA5V01P2C	SPEC	Compare WHTA5V01P2C	PDF	ESD	5	±20KV/±20KV	1.2	SOT-363	-40 °C to 125 °C
WHTB058VA	SPEC	Compare WHTB058VA	PDF	Bi-Directional TVS	58	-	-	DO-214AB	-60 °C to 150 °C
WHTA3V30P8B	SPEC	Compare WHTA3V30P8B	PDF	ESD	3.3	±30KV/±30KV	0.8	SOD323	-40 °C to 125 °C

By polarity

Unidirectional and bidirectional devices

Polarity follows the signal: unidirectional for DC rails, bidirectional for AC and differential lines.

01Uni-Directional TVS0 part numbers 02Bi-Directional TVS1 part numbers 03ESD3 part numbers 04Bi-Directional ESD1 part numbers

How to select

Selection guide for TVS Diodes and ESD Protection Devices

Selection steps, parameter explanations and the series comparison for TVS Diodes and ESD Protection Devices are on one page. Confirm the series there, then use this list for part numbers, files and samples.

Open the TVS Diodes and ESD Protection Devices selection guide →

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TVS and ESD datasheets

Datasheets carry the clamping curve, pulse waveform conditions and capacitance.

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VOOHU’s published product content is reviewed by its engineering team. Specifications, downloads and technical support information are tied to specific part numbers, so you can verify them before requesting samples or a quotation.

FAQ

TVS and ESD questions engineers ask

Answers cover TVS against ESD, polarity choice, capacitance and placement.

Guide 01Selecting a TVS or ESD device in four steps Guide 02Where TVS and ESD devices are fitted Guide 03TVS and ESD datasheets

When should I use a unidirectional TVS?

On a single polarity DC line that never goes negative in normal operation, such as a supply rail or a DC control input. The device blocks in the reverse direction and clamps in the forward direction, which gives tighter protection than a bidirectional part of the same voltage class.

What happens if I fit one to a bidirectional signal?

It conducts on the negative half and corrupts the signal, because a unidirectional part looks like a forward biased diode in that direction. On an AC line, a differential pair or a bus that swings both sides of ground, a bidirectional device is required rather than optional.

Does polarity matter when I place it?

Yes. A unidirectional device has a defined cathode and anode, marked on the package and defined in the datasheet. Fitting it the wrong way round leaves the line effectively unprotected in the direction that matters and forward biased in normal operation.

How do I set the standoff voltage?

Above the highest voltage the rail reaches in normal service, including ripple, tolerance and start-up transients that are not faults. Too low and the device leaks or conducts during operation. Then confirm the clamping voltage at your surge level stays below the protected device's rating.

How do I request samples or a quote?

With a complete part number, send the part number, quantity, delivery region and the date you need it. If you are still selecting, send the rail voltage, the surge standard you must meet and the withstand rating of the device being protected.

Engineer support

Continue after product selection

Send the candidate part number and the condition you need reviewed. Sample support can be added after the selection is clear; commercial questions may be discussed in the same engineering conversation.

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Published replacement reviews Push-Pull Transformer Selection Comparison: VOOHU WHST06Q02E0 vs. Würth Elektronik 750316819 2026-08-31 View all alternatives

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