SMBJ20CAHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ20CAHM3_A/I is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AA (SMB) package and is designed for telecom applications requiring transient voltage protection. The part is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Substiute Parts

SMBJ20CAHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 763SMBJ20CAHM3_A/I Datasheet

Current PartRFQ

SMBJ20CAHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1147SMBJ20CAHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ20CAHM3_A/I is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Parameters (Must Match):

• 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
• Bidirectional Channels: 1
• Type: Zener

Mechanical Parameters (Must Match):

• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount

Compliance & Certification (Must Match):

• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant

The SMBJ20CAHM3_B/I meets all substitution criteria as an active product within the same TransZorb® series, differing only in packaging format (Tape & Reel) and product status.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ20CAHM3_B/I is the direct functional equivalent of the SMBJ20CAHM3_A/I. Both parts are manufactured by Vishay within the TransZorb® series and maintain identical electrical specifications, thermal operating range, and automotive-grade certifications including AEC-Q101 qualification.

The primary distinction is product status: the SMBJ20CAHM3_A/I is obsolete, while the SMBJ20CAHM3_B/I is active. For new designs or ongoing production requiring this 20V, 600W TVS diode in DO-214AA packaging, the SMBJ20CAHM3_B/I provides assured long-term availability and supply chain continuity. Both parts satisfy ROHS3 compliance and automotive-grade requirements.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ20CAHM3_B/I be used as a direct replacement for the SMBJ20CAHM3_A/I?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters: 20V reverse standoff voltage, 32.4V clamping voltage, 18.5A peak pulse current, 600W peak pulse power, DO-214AA package, and AEC-Q101 automotive qualification. The only difference is packaging format and product status.

Q: What is the significance of the packaging format difference (Bulk vs. Tape & Reel)?

A: Packaging format affects procurement and assembly processes. Tape & Reel (TR) packaging is standard for automated surface mount assembly lines, while bulk packaging may be used for manual assembly or smaller production runs. The electrical and mechanical performance of the component itself is unaffected.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the SMBJ20CAHM3_A/I and SMBJ20CAHM3_B/I carry automotive-grade classification and AEC-Q101 qualification, meeting automotive industry reliability and quality standards.

Q: Why is the SMBJ20CAHM3_A/I marked as obsolete?

A: Product obsolescence typically reflects manufacturer discontinuation decisions. The SMBJ20CAHM3_B/I remains active and provides equivalent functionality for all applications previously served by the obsolete variant.

Q: Are there any thermal or environmental differences between these parts?

A: No. Both parts operate across the identical temperature range of -55°C to 150°C (junction temperature) and maintain the same electrical performance specifications across this range.