This protection module combines a SMBJ5.0A Transient Voltage Suppression (TVS) diode with a resettable PTC fuse to provide robust protection against voltage spikes, surges, overcurrent, and electrostatic discharge. It is designed to safeguard sensitive electronic circuits from transient overvoltage events commonly caused by inductive loads, power supply fluctuations, or external interference.

Key Features

Integrated surge and overcurrent protection in a compact module
Fast-response TVS diode for transient voltage clamping
Resettable PTC fuse automatically recovers after fault removal
Suitable for DC power lines and signal protection
Helps prevent damage to microcontrollers and peripheral circuits
Improves system reliability and long-term durability

Technical Specifications

TVS Diode (SMBJ5.0A):

Type: Unidirectional TVS diode
Stand-off voltage (Vwm): 5.0V
Breakdown voltage (Vbr): approx. 6.4V – 7.0V
Peak pulse power dissipation: 600W (10/1000 µs waveform)
Fast response time for transient suppression

Resettable Fuse (PTC):

Type: Polymer PTC resettable fuse
Operating voltage: typically up to 30V
Overcurrent protection with automatic reset after cooling
Low resistance during normal operation

Electrical Characteristics

Designed for low-voltage DC systems (5V logic and power rails)
Provides protection against ESD, lightning-induced surges, and load switching transients
Reduces risk of permanent damage caused by short circuits or current spikes