SMBJ120AHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ120AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This surface mount component is designed for telecom applications requiring transient voltage protection. The device features a 120V reverse standoff voltage with 193V maximum clamping voltage and 3.1A peak pulse current capability in a DO-214AA (SMB) package.

The SMBJ120AHM3_A/I carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for systems utilizing this component.

Substiute Parts

SMBJ120AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 833SMBJ120AHM3_A/I Datasheet

Current PartRFQ

SMBJ120AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 751SMBJ120AHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ120AHM3_A/I is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 120V
• Voltage - Breakdown (Min): 133V
• Voltage - Clamping (Max) @ Ipp: 193V
• Current - Peak Pulse (10/1000µs): 3.1A
• Power - Peak Pulse: 600W
• Unidirectional Channels: 1
• Type: Zener
• Package / Case: DO-214AA, SMB
• Operating Temperature Range: -55°C to 150°C (TJ)
• Grade: Automotive
• Qualification: AEC-Q101

The SMBJ120AHM3_B/I meets all substitution criteria as a manufacturer-recommended equivalent. Both parts share identical electrical specifications, thermal performance, automotive qualification, and mechanical packaging. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ120AHM3_B/I is the direct substitute for the obsolete SMBJ120AHM3_A/I. Both components are manufactured by Vishay and maintain identical electrical, thermal, and mechanical specifications. The substitute part carries Active product status, ensuring long-term availability and supply chain continuity.

Both parts satisfy automotive-grade requirements with AEC-Q101 qualification and maintain full compliance with RoHS3 and REACH regulations. The packaging format difference (bulk versus Tape & Reel) does not affect electrical or mechanical compatibility and represents a standard industry variation for component procurement.

Selection of the SMBJ120AHM3_B/I eliminates obsolescence risk while preserving all functional and performance characteristics required for telecom transient voltage suppression applications.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ120AHM3_B/I be used as a direct replacement for the SMBJ120AHM3_A/I?

A: Yes. Both parts are electrically and mechanically identical. All voltage ratings, current specifications, temperature ranges, and package dimensions match exactly. The substitute part is manufacturer-recommended and carries Active product status.

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

A: The primary differences are product status and packaging format. The SMBJ120AHM3_A/I is Obsolete, while the SMBJ120AHM3_B/I is Active. The SMBJ120AHM3_A/I is supplied in bulk packaging, while the SMBJ120AHM3_B/I is supplied in Tape & Reel format. Electrical specifications are identical.

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

A: No. Both parts use the same DO-214AA (SMB) surface mount package. PCB footprints, soldering procedures, and thermal management requirements are identical. No design modifications are required.

Q: Does the substitute part meet automotive qualification requirements?

A: Yes. The SMBJ120AHM3_B/I carries Automotive grade classification and AEC-Q101 qualification, matching the original part. Both components are suitable for automotive and industrial telecom applications.

Q: What is the impact of the Tape & Reel packaging on component performance?

A: Packaging format does not affect electrical or thermal performance. Tape & Reel is a standard procurement format that improves handling efficiency and reduces component damage during assembly. Functional characteristics remain unchanged.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the SMBJ120AHM3_A/I and SMBJ120AHM3_B/I are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.