SMBJ18CAHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ18CAHM3_A/I is a bidirectional transient voltage suppressor (TVS) diode from Vishay General Semiconductor - Diodes Division, designed for telecom applications. This component features a 18V reverse standoff voltage with a 29.2V maximum clamping voltage and 20.5A peak pulse current capability in a surface mount DO-214AA (SMB) package. The part is currently listed as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability.

Substiute Parts

SMBJ18CAHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 797SMBJ18CAHM3_A/I Datasheet

Current PartRFQ

SMBJ18CAHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 970SMBJ18CAHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SMBJ18CAHM3_B/I qualifies as a direct substitute for the SMBJ18CAHM3_A/I based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

• Voltage - Reverse Standoff (Typ): 18V
• Voltage - Breakdown (Min): 20V
• Voltage - Clamping (Max) @ Ipp: 29.2V
• Current - Peak Pulse (10/1000µs): 20.5A
• Power - Peak Pulse: 600W
• Package / Case: DO-214AA, SMB
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Bidirectional Channels: 1
• Automotive Grade with AEC-Q101 Qualification

The substitute part maintains all specified electrical performance characteristics and environmental ratings required for telecom applications.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ18CAHM3_B/I is the direct equivalent for the obsolete SMBJ18CAHM3_A/I. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications, thermal ratings, and automotive qualifications. The substitute part carries Active product status, ensuring continued availability and supply chain support. Both components maintain ROHS3 compliance and AEC-Q101 automotive qualification, meeting all regulatory and quality requirements for telecom applications. The transition from the obsolete variant to the active substitute presents no functional or compliance barriers for circuit design or manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can SMBJ18CAHM3_B/I be used as a direct replacement for SMBJ18CAHM3_A/I?

A: Yes. Both parts are electrically and mechanically identical, with matching voltage ratings (18V standoff, 29.2V clamping), current ratings (20.5A peak pulse), power dissipation (600W), and package specifications (DO-214AA SMB). The substitute maintains identical operating temperature range and automotive qualifications.

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

A: The primary difference is product status. SMBJ18CAHM3_A/I is obsolete, while SMBJ18CAHM3_B/I is active. The suffix designations (_A/I versus _B/I) indicate manufacturing variants, but electrical and mechanical parameters remain identical.

Q: Are there packaging differences between these parts?

A: Both parts use the same DO-214AA (SMB) surface mount package. The main packaging difference is that SMBJ18CAHM3_B/I is supplied in Tape & Reel format, which is standard for active production components.

Q: Do both parts meet automotive standards?

A: Yes. Both SMBJ18CAHM3_A/I and SMBJ18CAHM3_B/I carry Automotive grade classification and AEC-Q101 qualification, meeting automotive reliability and quality requirements.

Q: Are there any compliance or regulatory differences?

A: No. Both parts maintain identical ROHS3 compliance and REACH Unaffected status, ensuring equivalent environmental and regulatory compliance for all applications.