SMAJ8.5A-M3/5A Equivalent & Substitute Parts

Part Overview

The SMAJ8.5A-M3/5A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 8.5V reverse standoff voltage class and is designed for general-purpose transient protection applications. The part is Active status and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters that ensure functional interchangeability in circuit protection applications.

Substiute Parts

SMAJ8.5A-M3/5A

Vishay General Semiconductor - Diodes DivisionIn Stock: 904SMAJ8.5A-M3/5A Datasheet

Current PartRFQ

SMAJ8.5A-E3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 36431SMAJ8.5A-E3/61 Datasheet

DirectRFQ

SMAJ8.5A

MeritekIn Stock: 122822SMAJ8.5A Datasheet

DirectRFQ

SMAJ8.5A-13-F

Diodes IncorporatedIn Stock: 28707SMAJ8.5A-13-F Datasheet

DirectRFQ

P4SMA10A

Eaton - Electronics DivisionIn Stock: 10483P4SMA10A Datasheet

MFR RecommendedRFQ

SM4T10AY

STMicroelectronicsIn Stock: 5767SM4T10AY Datasheet

MFR RecommendedRFQ

SMA6J8.5A-TR

STMicroelectronicsIn Stock: 4638SMA6J8.5A-TR Datasheet

MFR RecommendedRFQ

SMAJ8.5A-TP

Micro Commercial CoIn Stock: 6552SMAJ8.5A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ8.5A-M3/5A are classified based on the following substitution criteria:

Primary Substitution Parameters:

• Voltage - Reverse Standoff (Typ): 8.5V ± tolerance
• Voltage - Clamping (Max) @ Ipp: 14.4V to 14.5V range
• Current - Peak Pulse: 27.7A to 28.3A range
• Package / Case: DO-214AC (SMA)
• Mounting Type: Surface Mount
• Type: Zener, Unidirectional

Direct Equivalents maintain all primary parameters within specification limits and are sourced from different manufacturers or packaging variants of the same base design.

Manufacturer Recommended Substitutes may exhibit minor variations in clamping voltage (up to 19.5V) or peak pulse current (up to 124A) while maintaining the same reverse standoff voltage class and package form factor. These parts provide enhanced performance characteristics suitable for applications requiring higher transient energy absorption.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Electrical and Mechanical Equivalence): SMAJ8.5A-E3/61, SMAJ8.5A (Meritek), SMAJ8.5A-13-F, and SMAJ8.5A-TP are functionally equivalent to the SMAJ8.5A-M3/5A. These parts maintain identical or near-identical electrical specifications within the 8.5V reverse standoff class and 14.4V clamping voltage range. All are RoHS3 compliant and packaged in DO-214AC (SMA) surface mount format. Selection among these direct equivalents may be based on packaging variant (Tape & Reel vs. Cut Tape), manufacturer availability, or inventory requirements.

Enhanced Performance Substitutes (Higher Transient Capability): P4SMA10A, SM4T10AY, and SMA6J8.5A-TR provide higher peak pulse current handling and clamping voltage characteristics while maintaining the 8.5V reverse standoff voltage class. These parts are suitable for applications requiring greater transient energy absorption. SM4T10AY and SMA6J8.5A-TR are qualified to AEC-Q101 automotive standards and feature extended operating temperature ranges (up to 175°C). Selection of these enhanced substitutes depends on circuit protection requirements exceeding the baseline 27.8A / 14.4V specification.

All substitute parts maintain RoHS compliance and surface mount DO-214AC (SMA) package compatibility with the original SMAJ8.5A-M3/5A design.

Frequently Asked Questions (FAQ)

Q: Can SMAJ8.5A-E3/61 be used as a direct replacement for SMAJ8.5A-M3/5A? A: Yes. Both parts are manufactured by Vishay and share identical electrical specifications: 8.5V reverse standoff voltage, 14.4V clamping voltage, and 27.8A peak pulse current. The difference is packaging variant (E3/61 vs. M3/5A tape reel configuration). Functional interchangeability is confirmed.

Q: What is the difference between SMAJ8.5A-13-F and SMAJ8.5A-TP? A: Both are direct electrical equivalents with 8.5V standoff and 14.4V clamping specifications. SMAJ8.5A-13-F is supplied by Diodes Incorporated in Cut Tape & Digi-Reel packaging. SMAJ8.5A-TP is supplied by Micro Commercial Co in Tape & Reel format with extended operating temperature range (-55°C to 175°C vs. -55°C to 150°C). Selection depends on packaging preference and temperature requirements.

Q: Can SM4T10AY replace SMAJ8.5A-M3/5A in all applications? A: SM4T10AY maintains the same 8.5V reverse standoff voltage and DO-214AC (SMA) package but features higher clamping voltage (19.5V) and significantly higher peak pulse current (124A at 8/20µs). This part is suitable for applications requiring enhanced transient protection. Verify circuit design compatibility with the higher clamping voltage before substitution.

Q: Are all substitute parts RoHS compliant? A: All listed substitute parts are RoHS compliant. SMAJ8.5A-M3/5A, SMAJ8.5A-E3/61, SMAJ8.5A (Meritek), SMAJ8.5A-13-F, SM4T10AY, SMA6J8.5A-TR, and SMAJ8.5A-TP are ROHS3 compliant. P4SMA10A is RoHS compliant. Compliance status is maintained across all substitution options.

Q: What is the significance of the 8/20µs vs. 10/1000µs pulse specification? A: Peak pulse current ratings are specified under different test waveforms. The 10/1000µs waveform (used for SMAJ8.5A-M3/5A and direct equivalents) represents a slower transient pulse. The 8/20µs waveform (used for SM4T10AY and SMA6J8.5A-TR) represents a faster transient pulse typical of lightning and ESD events. Both specifications are valid; selection depends on the transient threat profile in the application circuit.

Q: Is SMA6J8.5A-TR suitable for high-temperature applications? A: Yes. SMA6J8.5A-TR operates across -55°C to 175°C, providing a 25°C extended upper temperature limit compared to the baseline SMAJ8.5A-M3/5A (-55°C to 150°C). This part is qualified to AEC-Q101 automotive standards and is suitable for applications requiring enhanced thermal performance.