S4006VS3

Overview

The Littelfuse S4006VS3 is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. It is housed in a TO-251-3 surface-mount package, also known as DPAK. This component is designed to protect sensitive electronic circuits from voltage spikes and electrostatic discharge (ESD) events. The device features unidirectional polarity, ensuring protection for DC power lines where reverse voltage application must be avoided. Its compact form factor allows for integration into space-constrained printed circuit boards while providing robust clamping capabilities against high-energy transients.

Feature Summary

• Provides bidirectional or unidirectional transient voltage suppression depending on specific configuration variants within the series
• Designed with low clamping voltage characteristics to safeguard downstream semiconductor components
• Engineered for high peak pulse power dissipation to absorb energy from lightning-induced surges or inductive switching events

Applications

• Protection of data lines and power inputs in telecommunications equipment
• Surge suppression for automotive electronic control units and sensors
• Electrostatic discharge (ESD) protection in consumer electronics interfaces

Procurement Notes

Verify the exact datasheet revision and electrical parameters directly with Littelfuse or authorized distributors before procurement. Ensure the TO-251-3 package dimensions match your PCB footprint design. Confirm that the unidirectional specification aligns with your circuit's polarity requirements to prevent operational failure during normal bias conditions.

Selection Notes

Select this component based on its standoff voltage and breakdown voltage ratings relative to the operating voltage of the protected line. Consider the peak pulse current capability required for the specific surge environment. The TO-251-3 package offers a balance between thermal performance and board space efficiency compared to smaller SMD packages.

Part Context

The S4006VS3 belongs to Littelfuse's broader family of TVS diodes designed for transient protection. These devices are critical for maintaining system reliability in environments prone to electrical noise and surges. The VS3 suffix typically denotes the specific packaging and termination style, distinguishing it from through-hole or other surface-mount variants in the same electrical family.

Replacement Considerations

Check for direct pin-compatible substitutes from Littelfuse or other manufacturers offering similar TO-251-3 TVS diodes. Ensure replacement parts meet or exceed the original standoff voltage, breakdown voltage, and peak pulse power ratings. Verify that the replacement maintains the same unidirectional characteristic if required by the circuit design.