SM6T68AHM3_A/I Equivalent & Substitute Parts

Part Overview

The SM6T68AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for transient overvoltage protection in surface mount applications, featuring a 58.1V reverse standoff voltage and 92V maximum clamping voltage. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

SM6T68AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1172SM6T68AHM3_A/I Datasheet

Current PartRFQ

SM6T68AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1130SM6T68AHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SM6T68AHM3_A/I is determined by strict equivalence across the following critical parameters:

Voltage specifications must match exactly: Reverse standoff voltage of 58.1V (typical), breakdown voltage minimum of 64.6V, and maximum clamping voltage of 92V at peak pulse current.

Current and power ratings must be identical: Peak pulse current of 6.5A at 10/1000µs pulse duration and peak pulse power of 600W.

Physical and electrical configuration must be preserved: Unidirectional topology (single channel), Zener type, and DO-214AA (SMB) surface mount package.

Compliance and qualification standards must be maintained: Automotive grade with AEC-Q101 qualification and ROHS3 compliance.

The SM6T68AHM3_B/I meets all these criteria and is identified as the manufacturer-recommended substitute. The primary distinction is product status: the substitute is active production, whereas the original part is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The SM6T68AHM3_B/I is the direct functional equivalent of the SM6T68AHM3_A/I. Both parts share identical electrical specifications, thermal operating range, package configuration, and automotive-grade qualification. The substitute maintains full compliance with AEC-Q101 and ROHS3 standards.

The primary advantage of selecting SM6T68AHM3_B/I is product status: this part is in active production, ensuring long-term availability and supply chain stability. The original SM6T68AHM3_A/I, classified as obsolete, presents procurement risk and potential discontinuation.

For new designs or redesigns of existing products, SM6T68AHM3_B/I is the appropriate selection. For legacy system support requiring the original part number, SM6T68AHM3_B/I provides complete functional compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can SM6T68AHM3_B/I be used as a direct replacement for SM6T68AHM3_A/I?

A: Yes. Both parts are identical in electrical performance, voltage ratings, current capacity, thermal range, package type, and automotive qualification. The substitute is manufacturer-recommended and requires no circuit modifications.

Q: What is the difference between SM6T68AHM3_A/I and SM6T68AHM3_B/I?

A: The parts are electrically and mechanically identical. The difference is product status: SM6T68AHM3_A/I is obsolete, while SM6T68AHM3_B/I is active production. The packaging format differs (the substitute is supplied in Tape & Reel format), but the component itself is unchanged.

Q: Are there any compatibility concerns with the DO-214AA (SMB) package?

A: No. Both parts use the same DO-214AA surface mount package. PCB footprints, reflow profiles, and assembly processes are identical.

Q: Does the substitute maintain automotive qualification?

A: Yes. SM6T68AHM3_B/I carries the same Automotive grade and AEC-Q101 qualification as the original part.

Q: Is the substitute RoHS compliant?

A: Yes. SM6T68AHM3_B/I is ROHS3 compliant, matching the compliance status of the original part.

Q: What is the recommended action for designs currently using SM6T68AHM3_A/I?

A: Transition to SM6T68AHM3_B/I to ensure continued supply availability. No design changes are required.