SMAJ12CAHM3P/H Equivalent & Substitute Parts

Part Overview

The SMAJ12CAHM3P/H is a Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for telecom applications requiring transient protection. This bidirectional Zener diode operates with a 12V reverse standoff voltage and provides 19.9V clamping at peak pulse current. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing procurement and design continuity.

Substiute Parts

SMAJ12CAHM3P/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 816SMAJ12CAHM3P/H Datasheet

Current PartRFQ

SMAJ12CAHM3P_A/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 1003SMAJ12CAHM3P_A/H Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SMAJ12CAHM3P/H is determined by strict equivalence across the following critical parameters:

• Voltage ratings: 12V reverse standoff, 13.3V minimum breakdown, 19.9V maximum clamping
• Current handling: 20.1A peak pulse current (10/1000µs)
• Power dissipation: 400W peak pulse
• Package type: DO-214AC (SMA) surface mount
• Bidirectional Zener topology
• Automotive grade with AEC-Q101 qualification
• Operating temperature range: -55°C to 150°C
• RoHS3 compliance and MSL 1 rating

Parts meeting all these parameters are classified as direct equivalents and may be substituted without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

The SMAJ12CAHM3P_A/H is a direct equivalent substitute for the SMAJ12CAHM3P/H. Both parts are manufactured by Vishay within the TransZorb® series and share identical electrical specifications, package configuration, and automotive qualifications.

The primary distinction is product status: the original part is discontinued, while the substitute remains in active production with confirmed inventory availability (978 pieces in stock). Both parts maintain AEC-Q101 automotive qualification and ROHS3 compliance, ensuring regulatory and quality standards are preserved in substitution.

No circuit modifications, layout changes, or thermal management adjustments are required when substituting SMAJ12CAHM3P_A/H for SMAJ12CAHM3P/H.

Frequently Asked Questions (FAQ)

Q: Can SMAJ12CAHM3P_A/H be used as a direct replacement for SMAJ12CAHM3P/H?

A: Yes. Both parts are identical in electrical performance, voltage ratings, current handling, package type, and automotive qualifications. The substitute is a direct equivalent with no design changes required.

Q: What is the difference between these two part numbers?

A: The parts are functionally equivalent. The difference lies in the product status: SMAJ12CAHM3P/H is discontinued, while SMAJ12CAHM3P_A/H is actively manufactured and available.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the main part and substitute carry Automotive grade classification and AEC-Q101 qualification, meeting automotive reliability and quality standards.

Q: Is the DO-214AC (SMA) package identical between both parts?

A: Yes. Both parts use the same DO-214AC surface mount package, ensuring PCB footprint and assembly compatibility without modification.

Q: Do both parts meet RoHS and environmental compliance requirements?

A: Yes. Both SMAJ12CAHM3P/H and SMAJ12CAHM3P_A/H are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting environmental and handling requirements.

Q: What is the operating temperature range for these TVS diodes?

A: Both parts operate across -55°C to 150°C junction temperature, suitable for automotive and telecom applications across extended environmental conditions.