The SMBJ5.0A is a 600W transient voltage suppressor (TVS) diode designed to protect sensitive electronic equipment from voltage transients induced by inductive load switching, lightning strikes, electrostatic discharge (ESD), and other transient voltage events .

This device is specifically optimized for 5V circuit protection, with a reverse stand‑off voltage (V_RWM) of 5V and a maximum clamping voltage of 9.2V. When a transient over‑voltage occurs, the diode responds in sub‑nanosecond time (typically <1ns) to clamp the voltage to a safe level, diverting the surge current away from protected components .

The “A” suffix denotes a unidirectional device with a 5% tolerance breakdown voltage. Bidirectional versions are available with the “CA” suffix (e.g., SMBJ5.0CA). The SMBJ series is manufactured by multiple leading semiconductor companies including STMicroelectronics, Bourns, Vishay, Diodes Incorporated, and Microsemi .

Key technologies used in this device include:

Planar technology: Ensures low leakage current and high junction temperature operation, providing reliability and stability over time
Glass passivated chip junction: Enhances long‑term reliability and environmental stability

The device is packaged in a DO‑214AA (SMB) surface mount package, which is ideal for automated PCB assembly and provides a low profile for space‑constrained designs.

Parameters

Parameters	Specifications
Manufacturers	STMicroelectronics
Part Number	SMBJ5.0A
Diode Type	Transient Voltage Suppressor (TVS), Unidirectional
Working Peak Reverse Voltage (V_RWM)	5V
Breakdown Voltage (V_BR) Range	6.4V to 7.23V (typical 6.7V)
Clamping Voltage (V_C) Maximum	9.2V
Peak Pulse Power Dissipation (P_PPM)	600W (10/1000µs waveform)
Peak Pulse Current (I_PPM)	65.2A (typical), 100A (max)
Leakage Current (I_R) @ 25°C	0.2µA typical, 1µA maximum
Leakage Current (I_R) @ 85°C	1µA typical
Response Time	<1ns (unidirectional)
Test Current (I_T)	10mA
Package Type	DO‑214AA (SMB)
Mounting Type	Surface Mount
Operating Junction Temperature (T_J)	-55°C to +150°C
Storage Temperature Range	-55°C to +150°C
Moisture Sensitivity Level	MSL 1 (no dry pack required)
RoHS Compliant	Yes (depending on suffix, e.g., -13-F, -E3)

Applications

5V power supply protection – Over‑voltage clamping for DC power lines
Industrial control systems – Protecting PLCs, sensors, and I/O modules from switching transients
Telecommunications equipment – Secondary lightning protection per IEC61000-4-5 (Class 1-3)
Consumer electronics – Smartphones, tablets, laptops, and wearables prone to voltage fluctuations
Automotive electronics – Protection for ECUs, infotainment systems, and sensor interfaces (select AEC‑Q101 qualified versions)
Switch‑Mode Power Supplies (SMPS) – Protecting MOSFETs and control ICs from voltage spikes
ESD protection – Compliant with IEC61000-4-2 and MIL‑STD‑883 Method 3015
Medical devices – Ensuring reliability against electrical interference
Data acquisition systems – Protecting signal lines and analog inputs from induced RF and EFT transients