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SM4T21AY The SM4T21AY is a 400W unidirectional TVS diode from STMicroelectronics, featuring 18V reverse standoff voltage and 39.3V clamping voltage. It is surface mount in an SMA (DO-214AC) package.
Mfr Part #:

SM4T21AY

Available from 1 distributors
Mfr Name: STMicroelectronics
STMicroelectronics
The SM4T21AY is a 400W unidirectional TVS diode from STMicroelectronics, featuring 18V reverse standoff voltage and 39.3V clamping voltage. It is surface mount in an SMA (DO-214AC) package.
✓ Total Stock: 20,000 pcs
$ Price Range: $0.32 - $1.46

SM4T21AY Available from 1 distributor

✓ Authorised
✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
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Non-Authorised Inventory information
20,000 pcs
On Request
20000 pcs On Request 1 On Request On Request On Request On Request On Request
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SM4T21AY Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Applications
Automotive Grade
Current
Mounting Type
Operating Temperature
Power
Power Line Protection
Supplier Device Package
Tape & Reel
Technology
Type
Unidirectional Channels
Voltage
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SM4T21AY Description

Short technical summary and product information.

The SM4T21AY is a unidirectional transient voltage suppression (TVS) diode designed for automotive applications. It provides 400W peak pulse power (8/20µs waveform) with a peak pulse current rating of 59A. The device has a reverse standoff voltage of 18V and a clamping voltage of 39.3V. It is not intended for power line protection. The SM4T21AY is surface mountable in an SMA (DO-214AC) package and operates over a temperature range of -55°C to 150°C. It is RoHS3 compliant and has MSL 1 unlimited moisture sensitivity level. This component is suitable for protecting sensitive electronics from voltage transients in automotive environments.

SM4T21AY Quick Information

Product Type: TVS Diode
Canonical Name: STMicroelectronics SM4T21AY TVS Diode, Unidirectional, 400W, SMA Package
Subcategory: Unidirectional TVS Diode

SM4T21AY Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

SM4T21AY Estimated Pricing

Qty Low High
1+ $1.46 $1.46
10+ $0.92 $0.92
100+ $0.61 $0.61
500+ $0.48 $0.48
1,000+ $0.43 $0.43
2,500+ $0.37 $0.37
5,000+ $0.35 $0.35
10,000+ $0.33 $0.33
25,000+ $0.32 $0.32

Estimated market price range - modelled values for guidance only, not live distributor offers.

SM4T21AY Features

  • 400W peak pulse power dissipation.
  • 18V reverse standoff voltage rating.
  • 39.3V clamping voltage protection.
  • Unidirectional TVS diode design.
  • Surface mount SMA package.

SM4T21AY Applications

  • Automotive electronic system protection.
  • Transient voltage suppression circuits.
  • Sensitive IC input protection.

SM4T21AY FAQs

7 frequently asked questions generated from this part’s specifications.
What is the reverse standoff voltage of SM4T21AY?

18V.

What is the clamping voltage of SM4T21AY?

39.3V.

What is the peak pulse current rating of SM4T21AY?

59A (8/20µs waveform).

What package is the SM4T21AY available in?

DO-214AC, SMA.

Is the SM4T21AY unidirectional?

Yes, it is a unidirectional TVS diode.

What is the peak pulse power of SM4T21AY?

400W.

What is the operating temperature range of SM4T21AY?

-55°C to 150°C.

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