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STMICROELECTRONICS SM4T21AY Automotive Surge Protector

The SM4TY series consists of automotive-grade Transil™ devices designed for surge protection of sensitive circuits against ISO 7637-2 pulses and electrostatic discharges per ISO 10605. Packaged in JEDEC SMA footprint with a resin meeting UL 94 V-0, these unidirectional and bidirectional components offer high power dissipation up to 400 W with a peak pulse power of 2.3 kW, low leakage current, and operate safely at junction temperatures up to 150°C. Suitable for automotive environments requiring reliable transient suppression and electromagnetic compatibility.

Authorized Distributors
Source:DigiKey
Part No:SM4T21AY
Stock:0
Inv Date:06-11-2026
Price: Unit price: $0.38401
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Part No:SM4T21AY
Stock:4006
Inv Date:06-12-2026
Price: Unit price: $1.46
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Part No:SM4T21AY
Stock:4179
Inv Date:06-12-2026
Price: N/A
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STMICROELECTRONICS SM4T21AY Automotive Surge Protector Specifications:

  • Peak pulse power: 400 W (10/1000 ps), 2.3 kW (8/20 us)
  • Stand-off voltage: 5 V to 70 V
  • Types: Unidirectional and bidirectional
  • Operating junction temperature: -55°C to +150°C
  • Storage temperature: -65°C to +150°C
  • Maximum lead soldering temperature: 260°C for 10 seconds
  • Package: SMA (JEDEC DO-214AB)
  • Dimensions: Length 2.25-2.90 mm, width 1.25-1.65 mm, height 4.80-5.35 mm
  • UL 94 V-0 flammability rating, RoHS compliant
  • High surge current capability, low leakage current at 25°C and 85°C, and meets automotive Q101 standards.

Buy the STMicroelectronics SM4T21AY – Reliable Automotive Surge Protection for Industrial Applications

Secure your automotive circuits with the high-performance automotive surge protector in SMA package. The SM4T21AY offers 400 W peak pulse power and 2.3 kW surge capacity, ensuring robust transient suppression against ISO pulse standards. Designed for unidirectional and bidirectional use, it features low leakage current and operates safely within a maximum junction temperature of 150°C. With proven reliability, UL 94 V-0 resin, and automotive-grade qualification, this device guarantees long-term performance and electromagnetic compatibility in demanding automotive environments. Purchase online today for dependable surge protection.

Buy STMicroelectronics SM4T21AY now and experience unmatched reliability and high surge current handling for automotive circuits.

Frequently Asked Questions

Where can I buy STMICROELECTRONICS SM4T21AY?

You can click on the BUY or RFQ button to purchase SM4T21AY from an authorized STMICROELECTRONICS distributor.

How do I troubleshoot issues or seek technical support for part SM4T21AY?

You can download the SM4T21AY datasheet or visit the STMICROELECTRONICS website for support.

Who is the manufacturer of SM4T21AY?

STMICROELECTRONICS

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