SMBJ78CAHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ78CAHM3_A/I is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for telecom applications requiring transient protection. This component features a 78V reverse standoff voltage with 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 substitutes essential for ongoing design support and procurement.

Substiute Parts

SMBJ78CAHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 874SMBJ78CAHM3_A/I Datasheet

Current PartRFQ

SMBJ78CAHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1129SMBJ78CAHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ78CAHM3_A/I is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 78V
• Voltage - Breakdown (Min): 86.7V
• Voltage - Clamping (Max) @ Ipp: 126V
• Current - Peak Pulse (10/1000µs): 4.8A
• Power - Peak Pulse: 600W
• Bidirectional Channels: 1
• Type: Zener
• Package / Case: DO-214AA, SMB
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Grade: Automotive
• Qualification: AEC-Q101

The SMBJ78CAHM3_B/I is identified as the manufacturer-recommended substitute. This part maintains identical electrical specifications and environmental ratings while differing only in packaging format (Tape & Reel versus bulk) and product status (Active versus Obsolete).

Parameter Comparison

Engineering Selection Recommendations

The SMBJ78CAHM3_B/I is the direct functional equivalent of the SMBJ78CAHM3_A/I. Both parts are manufactured by Vishay and share identical electrical performance specifications, thermal operating range, and automotive-grade qualification (AEC-Q101). The primary distinction is product lifecycle status: the original part is obsolete while the substitute remains in active production.

For new designs or ongoing production requiring this TVS diode specification, the SMBJ78CAHM3_B/I should be selected. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The substitute's active status provides superior long-term availability and supply chain stability compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can SMBJ78CAHM3_B/I be used as a direct replacement for SMBJ78CAHM3_A/I?

A: Yes. Both parts are electrically and mechanically identical across all critical parameters including voltage ratings, current handling, temperature range, and package configuration. The substitute is the manufacturer-recommended equivalent.

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

A: The SMBJ78CAHM3_A/I and SMBJ78CAHM3_B/I differ in packaging format and product status. The A/I variant is obsolete, while the B/I variant is active production. The B/I is supplied in Tape & Reel format, which is standard for high-volume manufacturing.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain identical automotive-grade qualification (AEC-Q101), ROHS3 compliance, and REACH unaffected status. There are no compliance or certification differences between the two parts.

Q: Is the DO-214AA (SMB) package identical for both parts?

A: Yes. Both parts use the same DO-214AA surface mount package, ensuring identical PCB footprint and assembly compatibility.

Q: Why is the original part obsolete?

A: Product obsolescence is determined by the manufacturer based on market demand and production lifecycle decisions. The active substitute ensures continued access to this TVS diode specification.