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SMBJ12A

600W unidirectional TVS, 12V standoff, 19.9V clamp, SMB package

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Manufacturer Part：

SMBJ12A

Package：

SMB (DO-214AA) (4.6 x 3.9 x 2.3 mm)

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Description

Product Overview

The SMBJ12A is a 600W unidirectional TVS diode in an SMB (DO-214AA) package. With 12V standoff voltage and 19.9V clamping voltage, it provides transient overvoltage protection for 12V power rails commonly found in automotive and industrial systems.

Key Specifications

Type Unidirectional TVS Diode
Peak Pulse Power 600W (10/1000us)
Standoff Voltage (VRWM) 12V
Breakdown Voltage (VBR) 13.3V ~ 14.7V @ 1mA
Clamping Voltage (VC) 19.9V @ IPP=30.2A
Leakage Current 1uA @ VRWM
Package SMB (DO-214AA)
Operating Temperature -55°C to +150°C (TJ)

Features

  • 600W peak pulse power (10/1000us)
  • 12V reverse standoff voltage
  • 19.9V maximum clamping voltage at 30.2A
  • Low 1uA leakage at standoff
  • Unidirectional for DC rail protection
  • SMB surface-mount package

Applications

  • 12V automotive power rail transient protection
  • Industrial 12V bus surge suppression
  • Telecom equipment power input protection
  • LED driver output overvoltage clamp
  • Embedded system power supply ESD protection

The SMBJ12A is a 600W unidirectional transient voltage suppression (TVS) diode in an SMB (DO-214AA) surface-mount package. With 12V reverse standoff voltage and 19.9V maximum clamping voltage at 30.2A peak pulse current, it provides robust protection for 12V power rails against ESD, EFT, and surge transients. The low 1uA leakage current at standby minimizes power draw. Available from multiple manufacturers (Littelfuse, Yageo, MCC, Bourns) ensuring multi-source supply. IEC 61000-4-2 ESD protection to 30kV air discharge. The SMB package provides a balance of power handling and PCB footprint.

The SMBJ12A operates as an avalanche breakdown diode. Under normal conditions (voltage below 12V VRWM), the device draws only 1uA leakage current. When a transient exceeds the breakdown voltage (13.3-14.7V), the device enters avalanche breakdown, conducting heavily and clamping the voltage to 19.9V at the rated 30.2A peak current. The 600W peak pulse power dissipation absorbs transient energy. After the transient passes, the device returns to its high-impedance off-state. The unidirectional configuration protects DC power rails where voltage polarity is fixed, blocking reverse voltage like a normal diode.

Pin Name Type Function
1 Cathode Power Cathode (connect to positive rail)
2 Anode Power Anode (connect to ground)
  • 12V automotive battery rail load dump and ESD protection
  • Industrial 12V DC bus transient suppression
  • Telecom equipment 12V power input surge clamp
  • LED driver and lighting 12V output protection
  • Embedded system 12V power supply overvoltage protection
Manufacturer Part Number Package Notes
Yageo SMBJ12A SMB Multi-source equivalent
MCC SMBJ12A-TP SMB Multi-source equivalent
Bourns SMBJ12A-M3/9AT SMB Multi-source equivalent
ST SMBJ12A-TR SMB Multi-source equivalent
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All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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