SMBJ18AHM3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ18AHM3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by 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 classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability.

Substiute Parts

SMBJ18AHM3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 998SMBJ18AHM3_A/I Datasheet

Current PartRFQ

SMBJ18AHM3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 988SMBJ18AHM3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ18AHM3_A/I is determined by strict equivalence across the following critical parameters:

• 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
• Unidirectional Channels: 1
• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Grade: Automotive
• Qualification: AEC-Q101

The SMBJ18AHM3_B/I is the manufacturer-recommended substitute, maintaining identical electrical specifications and package configuration while offering active product status and improved supply availability.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ18AHM3_B/I is the direct equivalent for the obsolete SMBJ18AHM3_A/I. Both components are manufactured by Vishay within the TransZorb® series and maintain identical electrical and thermal specifications. The primary distinction is product status: the SMBJ18AHM3_A/I is obsolete, while the SMBJ18AHM3_B/I is active.

Both parts carry automotive-grade qualification (AEC-Q101) and ROHS3 compliance, meeting the same regulatory and environmental standards. The SMBJ18AHM3_B/I is supplied in Tape & Reel (TR) packaging, which is standard for high-volume production environments.

For new designs or component replenishment, the SMBJ18AHM3_B/I is the appropriate selection due to its active status and assured long-term availability.

Frequently Asked Questions (FAQ)

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

A: Yes. Both components are identical in electrical performance, thermal characteristics, and package configuration. The SMBJ18AHM3_B/I is the active equivalent and is suitable for direct substitution in all applications where the SMBJ18AHM3_A/I was specified.

Q: What is the difference between the SMBJ18AHM3_A/I and SMBJ18AHM3_B/I?

A: The primary difference is product status. The SMBJ18AHM3_A/I is obsolete, while the SMBJ18AHM3_B/I is active. Packaging differs slightly: the SMBJ18AHM3_B/I is supplied in Tape & Reel format. All electrical and thermal specifications are identical.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the SMBJ18AHM3_A/I and SMBJ18AHM3_B/I carry automotive-grade qualification (AEC-Q101) and are suitable for automotive telecom applications.

Q: What is the operating temperature range for these TVS diodes?

A: Both components operate across -55°C to 150°C junction temperature, meeting automotive environmental requirements.

Q: Are these components RoHS compliant?

A: Yes. Both the SMBJ18AHM3_A/I and SMBJ18AHM3_B/I are ROHS3 compliant.

Q: What package format is used for the SMBJ18AHM3_B/I?

A: The SMBJ18AHM3_B/I is supplied in Tape & Reel (TR) packaging, which is standard for automated assembly processes.