SMBJ78AHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ78AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for telecom applications. This component features a 78V reverse standoff voltage with a 126V maximum clamping voltage and 4.8A peak pulse current capability in a surface mount DO-214AA (SMB) package. The part is currently classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement.

Substiute Parts

SMBJ78AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 768SMBJ78AHM3_A/I Datasheet

Current PartRFQ

SMBJ78AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 957SMBJ78AHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ78AHM3_A/I is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 78V (±tolerance)
• Voltage - Breakdown (Min): 86.7V
• Voltage - Clamping (Max) @ Ipp: 126V
• Current - Peak Pulse (10/1000µs): 4.8A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA (SMB)
• Mounting Type: Surface Mount
• Type: Zener, Unidirectional
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Automotive Grade and AEC-Q101 Qualification

The SMBJ78AHM3_B/I is a direct manufacturer-recommended substitute that maintains identical electrical specifications and package configuration while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ78AHM3_B/I is the direct equivalent for the obsolete SMBJ78AHM3_A/I. Both components maintain identical electrical performance specifications and automotive-grade certifications (AEC-Q101). The primary distinction is product status: the SMBJ78AHM3_B/I is actively manufactured and supported, whereas the SMBJ78AHM3_A/I is obsolete. For new designs or ongoing production requiring this 78V TVS diode specification, the SMBJ78AHM3_B/I should be selected. Both parts are ROHS3 compliant and suitable for telecom transient protection applications requiring 600W peak pulse power dissipation in a surface mount form factor.

Frequently Asked Questions (FAQ)

Q: Can SMBJ78AHM3_B/I be used as a direct replacement for SMBJ78AHM3_A/I?

A: Yes. Both parts are identical in electrical specifications, package configuration, and automotive qualifications. The SMBJ78AHM3_B/I is the manufacturer-recommended active equivalent.

Q: What is the difference between SMBJ78AHM3_A/I and SMBJ78AHM3_B/I?

A: The primary difference is product status. SMBJ78AHM3_A/I is obsolete, while SMBJ78AHM3_B/I is active. Electrical performance and package specifications are identical. SMBJ78AHM3_B/I is supplied in Tape & Reel packaging.

Q: Are both parts suitable for automotive applications?

A: Yes. Both components carry automotive grade classification and AEC-Q101 qualification, meeting automotive reliability and quality standards.

Q: What is the DO-214AA (SMB) package?

A: DO-214AA, commonly referred to as SMB (Surface Mount Body), is a standard surface mount package for semiconductor diodes. Both parts use this identical package configuration, ensuring PCB footprint compatibility.

Q: What are the key electrical parameters that define this TVS diode?

A: The critical parameters are 78V reverse standoff voltage, 126V maximum clamping voltage, 4.8A peak pulse current, and 600W peak pulse power rating. These specifications determine the transient protection capability for telecom applications.

Q: Is the SMBJ78AHM3_B/I ROHS compliant?

A: Yes. The SMBJ78AHM3_B/I is ROHS3 compliant, meeting environmental and hazardous substance restrictions.