SMBJ20AHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ20AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for telecom applications requiring transient protection. This component features a 20V reverse standoff voltage with a 32.4V maximum clamping voltage and 18.5A peak pulse current capability in a surface mount DO-214AA (SMB) package. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability.

Substiute Parts

SMBJ20AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 784SMBJ20AHM3_A/I Datasheet

Current PartRFQ

SMBJ20AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 761SMBJ20AHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ20AHM3_A/I is determined by strict equivalence across the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 20V
• Voltage - Breakdown (Min): 22.2V
• Voltage - Clamping (Max) @ Ipp: 32.4V
• Current - Peak Pulse (10/1000µs): 18.5A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Unidirectional Channels: 1
• Type: Zener
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Automotive Grade and AEC-Q101 Qualification

The SMBJ20AHM3_B/I is identified as the manufacturer-recommended substitute. This part maintains identical electrical specifications and package configuration while offering active product status and improved supply chain availability.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ20AHM3_B/I is the direct equivalent for the obsolete SMBJ20AHM3_A/I. Both parts are manufactured by Vishay within the TransZorb® series and maintain identical electrical performance specifications. The primary distinction is product status: the SMBJ20AHM3_A/I is obsolete, while the SMBJ20AHM3_B/I is active.

Both parts satisfy automotive-grade requirements with AEC-Q101 qualification and ROHS3 compliance. The SMBJ20AHM3_B/I is available in Tape & Reel packaging, supporting high-volume production environments. Selection of the SMBJ20AHM3_B/I ensures compliance with current supply chain practices and maintains full electrical and mechanical compatibility with designs originally specified for the SMBJ20AHM3_A/I.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ20AHM3_B/I be used as a direct replacement for the SMBJ20AHM3_A/I?

A: Yes. Both parts are identical in electrical specifications, package configuration, and performance characteristics. The SMBJ20AHM3_B/I is the active equivalent and is recommended for new designs and production continuity.

Q: Are there any differences in the DO-214AA (SMB) package between these parts?

A: No. Both parts use the same DO-214AA surface mount package with identical mechanical dimensions and land pattern requirements.

Q: What is the significance of the product status difference?

A: The SMBJ20AHM3_A/I is classified as obsolete, indicating discontinued manufacturing. The SMBJ20AHM3_B/I maintains active production status, ensuring reliable supply availability and support from the manufacturer.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the SMBJ20AHM3_A/I and SMBJ20AHM3_B/I carry automotive-grade classification with AEC-Q101 qualification, suitable for automotive transient protection applications.

Q: Are there packaging format options for the SMBJ20AHM3_B/I?

A: The SMBJ20AHM3_B/I is supplied in Tape & Reel (TR) format, optimized for automated assembly and high-volume production environments.