SMBJ18AHM3_A/H Equivalent & Substitute Parts

Part Overview

The SMBJ18AHM3_A/H is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for telecom applications. This component operates with an 18V reverse standoff voltage and provides 600W peak pulse power protection in a surface mount DO-214AA (SMB) package. The part is classified as obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure supply chain availability for new production and field replacements.

Substiute Parts

SMBJ18AHM3_A/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 1239SMBJ18AHM3_A/H Datasheet

Current PartRFQ

SMBJ18AHM3_B/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 1098SMBJ18AHM3_B/H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ18AHM3_A/H is determined by strict equivalence across the following electrical and mechanical parameters:

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

The SMBJ18AHM3_B/H meets all these criteria and is classified as an active product, making it a direct functional equivalent suitable for replacement in applications requiring the SMBJ18AHM3_A/H.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ18AHM3_B/H is the direct substitute for the obsolete SMBJ18AHM3_A/H. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications, automotive grade classification, and AEC-Q101 qualification. The primary distinction is product status: the SMBJ18AHM3_A/H is obsolete, while the SMBJ18AHM3_B/H maintains active production status.

For new designs and production applications, the SMBJ18AHM3_B/H is the appropriate selection. For field replacements of existing SMBJ18AHM3_A/H assemblies, the SMBJ18AHM3_B/H provides equivalent performance and maintains compliance with automotive and telecom application requirements. Both parts satisfy ROHS3 and REACH regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SMBJ18AHM3_B/H be used as a direct replacement for SMBJ18AHM3_A/H?

A: Yes. The SMBJ18AHM3_B/H is electrically and mechanically identical to the SMBJ18AHM3_A/H across all specified parameters, including voltage ratings, current handling, power dissipation, operating temperature range, and package configuration. The primary difference is product status: SMBJ18AHM3_B/H is active production while SMBJ18AHM3_A/H is obsolete.

Q: Are there any differences in automotive qualification between these parts?

A: No. Both the SMBJ18AHM3_A/H and SMBJ18AHM3_B/H carry automotive grade classification and AEC-Q101 qualification, ensuring compliance with automotive reliability and quality standards.

Q: What is the physical package for both parts?

A: Both parts use the DO-214AA (SMB) surface mount package, enabling direct PCB footprint compatibility without layout modifications.

Q: Are regulatory compliance requirements the same?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for telecom and automotive applications.

Q: Why is the SMBJ18AHM3_A/H listed as obsolete?

A: The SMBJ18AHM3_A/H has been discontinued by the manufacturer. The SMBJ18AHM3_B/H represents the active production equivalent and should be used for all new designs and ongoing supply requirements.