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SMBJ5.0A-TR

Unidirectional TVS diode, 5V stand-off, 9.2V clamp, 600W, SMB DO-214AA

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Manufacturer Part：

SMBJ5.0A-TR

Package：

SMB (DO-214AA, 5.3 x 5.2 x 2.6 mm)

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Description

Product Overview

The SMBJ5.0A-TR from STMicroelectronics is a unidirectional Transient Voltage Suppressor (TVS) diode with a 5.0V stand-off voltage, 600W peak pulse power rating, and 9.2V clamping voltage. Housed in an SMB (DO-214AA) package, it provides ESD and transient protection for low-voltage power lines and data interfaces.

Key Specifications

Type Unidirectional TVS Diode
Stand-off Voltage (VRWM) 5.0V
Breakdown Voltage (VBR) 6.4V (minimum) / 7.07V (maximum)
Clamping Voltage (VC) 9.2V (maximum at IPP)
Peak Pulse Power (PPP) 600W (8/20 µs)
Peak Pulse Current (IPP) 65.2A (8/20 µs)
Leakage Current (IR) 800 µA at VRWM
Operating Temperature -55°C to +150°C
Package SMB (DO-214AA)
Packing Tape & Reel

Features

  • 600W peak pulse power dissipation (10/1000 µs)
  • 5.0V stand-off voltage for 5V logic protection
  • Low clamping voltage: 9.2V maximum
  • Unidirectional protection for positive voltage lines
  • Response time: virtually instantaneous (sub-nanosecond)
  • SMB (DO-214AA) surface-mount package
  • RoHS compliant (Ecopack2)
  • ESD protection per IEC 61000-4-2: ±30 kV contact

Applications

  • 5V power supply line protection
  • USB VBUS protection
  • RS-485 transceiver protection
  • Telecom line protection
  • Industrial I/O module protection
  • Security system sensor inputs

The SMBJ5.0A-TR from STMicroelectronics is a 600W unidirectional Transient Voltage Suppressor (TVS) diode designed to protect sensitive electronic circuits from voltage transients caused by ESD, EFT, and lightning surges. The device features a 5.0V stand-off voltage, making it ideal for protecting 5V logic and power supply lines. Under transient conditions, the TVS diode clamps the voltage to a maximum of 9.2V, protecting downstream components. With a peak pulse power rating of 600W (10/1000 µs waveform), the SMBJ5.0A can absorb significant surge energy. The SMB (DO-214AA) package offers a compact surface-mount solution with good thermal performance. The TR suffix indicates tape and reel packaging for automated assembly. The device provides ±30 kV ESD protection per IEC 61000-4-2.

The SMBJ5.0A-TR operates through two key mechanisms:

1. Normal Operation: When the protected line voltage is below the stand-off voltage (5.0V), the TVS diode operates in reverse-bias with leakage current of 800 µA maximum. The device is effectively invisible to the circuit, presenting only its junction capacitance to the signal path.

2. Transient Clamping: When a positive voltage transient exceeds the breakdown voltage (6.4V minimum), the TVS diode enters avalanche breakdown. The device rapidly conducts, diverting the transient current away from the protected circuit. The voltage is clamped to 9.2V maximum at the rated peak pulse current of 65.2A (8/20 µs). The 600W peak pulse power rating ensures the device can safely dissipate high-energy surges. After the transient subsides, the diode returns to its high-impedance state.

Pin Name Type Function
1 Cathode Terminal Positive terminal (connect to protected line)
2 Anode Terminal Negative terminal (connect to ground)
  • 5V power supply lines: 600W peak pulse power protects 5V rails from lightning-induced surges and EFT events with 9.2V clamping voltage
  • USB VBUS protection: 5.0V stand-off voltage matches USB 2.0 power rail, clamping hot-plug transients to safe levels for downstream USB controllers
  • RS-485 bus protection: Unidirectional TVS protects RS-485 transceivers from common-mode surge events on industrial communication lines
  • Industrial I/O modules: SMB package provides 600W surge protection for 5V sensor inputs and control outputs in factory automation environments
Manufacturer Part Number Package Notes
STMicroelectronics SMBJ5.0CA-TR SMB Bidirectional version
STMicroelectronics SMAJ5.0A-TR SMA 400W, smaller package
onsemi SMBJ5.0A SMB 600W, equivalent specs
Vishay SMBJ5.0A-E3/52 SMB 600W, equivalent specs
Littelfuse SMBJ5.0A SMB 600W, equivalent specs
Bourns SMBJ5.0A SMB 600W, equivalent specs
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