ACDST-70-HF

Overview

The ACDST-70-HF is a transient voltage suppression diode manufactured by Comchip Technology. It features a unidirectional configuration with a working voltage of 70 V and a breakdown voltage of 77.8 V. The device handles a peak pulse current of 5.3 A, resulting in a peak pulse power dissipation of 600 W. It clamps at 113 V under specified conditions. The component operates within a temperature range of -55 °C to +150 °C junction temperature. It utilizes an SMB (DO-214AA) surface-mount package and offers a forward voltage of 3.5 V.

Feature Summary

• Provides automotive-grade transient voltage protection for sensitive electronic circuits
• Unidirectional design ensures correct polarity operation in DC power lines
• High surge capability manages high-energy transients via 600 W peak pulse rating

Applications

• Automotive electronics systems requiring ESD and transient protection
• Protection of I/O ports in automotive control modules
• Surge suppression on vehicle data bus lines

Procurement Notes

Verify the specific datasheet revision and RoHS compliance status directly with Comchip Technology or authorized distributors before procurement. Confirm that the SMB package dimensions match your PCB footprint requirements. Ensure the unidirectional variant aligns with your circuit's polarity constraints. Validate that the 600 W pulse rating meets the transient energy profile of your target application environment.

Selection Notes

Select this component when designing circuits for automotive environments subject to ISO 7637 or similar transient standards. The unidirectional characteristic makes it suitable for single-rail DC power supplies where reverse polarity protection is not required. Compare the 70 V working voltage against your system's nominal operating voltage to ensure adequate margin. Consider the SMB package size relative to available board space and thermal dissipation needs.

Part Context

This part belongs to Comchip Technology's AUSMBJ series of automotive TVS diodes. The series is designed to meet automotive reliability standards. The 'HF' suffix typically indicates halogen-free manufacturing processes. It serves as a specialized protection device within the broader category of surface-mount transient suppressors used in harsh electrical environments.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.