SMBJ18AHE3_A/I Equivalent & Substitute Parts

Part Overview

The SMBJ18AHE3_A/I is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AA (SMB) package. This component provides transient overvoltage protection with a 18V reverse standoff voltage and 29.2V maximum clamping voltage at peak pulse current of 20.5A.

The main part is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this TVS diode.

Substiute Parts

SMBJ18AHE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 839SMBJ18AHE3_A/I Datasheet

Current PartRFQ

SMBJ18AHE3_B/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 996SMBJ18AHE3_B/I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ18AHE3_A/I is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff: 18V (typical)
• Voltage - Breakdown: 20V (minimum)
• Voltage - Clamping: 29.2V (maximum at Ipp)
• Current - Peak Pulse: 20.5A (10/1000µs waveform)
• Power - Peak Pulse: 600W
• Package: DO-214AA (SMB) surface mount
• Unidirectional configuration (single channel)
• Operating temperature range: -55°C to 150°C
• Automotive grade with AEC-Q101 qualification

The SMBJ18AHE3_B/I meets all these criteria and is identified as the manufacturer-recommended substitute. The primary distinction is product status: the original part is obsolete, while the substitute is active in production.

Parameter Comparison

Engineering Selection Recommendations

The SMBJ18AHE3_B/I is the direct substitute for the SMBJ18AHE3_A/I. Both parts are manufactured by Vishay and share identical electrical specifications, package configuration, and automotive-grade certifications including AEC-Q101 qualification.

Selection of the SMBJ18AHE3_B/I is supported by:

• Active product status ensuring ongoing availability and supply chain support
• Identical electrical performance across all critical parameters
• Equivalent automotive-grade qualification and compliance certifications
• Same surface mount package (DO-214AA, SMB) enabling direct PCB compatibility
• ROHS3 compliance and REACH unaffected status maintained

No design modifications or re-qualification are required when transitioning from the obsolete SMBJ18AHE3_A/I to the active SMBJ18AHE3_B/I.

Frequently Asked Questions (FAQ)

Q: Can the SMBJ18AHE3_B/I be used as a direct replacement for the SMBJ18AHE3_A/I?

A: Yes. The SMBJ18AHE3_B/I is the manufacturer-recommended substitute with identical electrical specifications, package configuration, and automotive certifications. Direct PCB substitution is supported without design changes.

Q: Are there any differences in packaging between these parts?

A: Both parts use the DO-214AA (SMB) surface mount package. The main part is supplied in standard packaging, while the substitute is available in Tape & Reel (TR) format. The component footprint and electrical interface remain identical.

Q: What is the primary reason for substitution?

A: The SMBJ18AHE3_A/I is obsolete. The SMBJ18AHE3_B/I is the active equivalent from the same manufacturer, ensuring continued supply availability and support.

Q: Are compliance certifications maintained in the substitute part?

A: Yes. Both parts maintain automotive-grade classification, AEC-Q101 qualification, ROHS3 compliance, and REACH unaffected status.

Q: Do the electrical performance characteristics differ between these parts?

A: No. Both parts have identical reverse standoff voltage (18V), breakdown voltage (20V), clamping voltage (29.2V), peak pulse current (20.5A), and peak pulse power (600W).