SMAJ85A-M3/61 Equivalent & Substitute Parts

Part Overview

The SMAJ85A-M3/61 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 85V reverse standoff voltage class and is designed for general-purpose transient protection applications. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified to provide design flexibility, inventory alternatives, and sourcing options while maintaining electrical and mechanical compatibility within the DO-214AC (SMA) package standard.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	85	V
Voltage - Breakdown (Min)	94.4	V
Voltage - Clamping (Max) @ Ipp	137	V
Current - Peak Pulse (10/1000µs)	2.2	A
Power - Peak Pulse	300	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ85A-M3/61 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 85V
Voltage - Breakdown (Min): 94V minimum
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Type: Zener, Unidirectional
RoHS Status: ROHS3 Compliant

Substitute parts must maintain the same reverse standoff voltage class (85V) and operate within compatible breakdown voltage ranges. All identified substitutes are packaged in DO-214AC (SMA) format and are surface mount compatible. Variations in clamping voltage, peak pulse current, and power dissipation are permitted within the electrical design envelope of the application circuit.

Parameter Comparison

Parameter	SMAJ85A-M3/61 (Vishay)	SMA6J85A-TR (STMicroelectronics)	SMAJ85A (MDD)	SMAJ85A-13-F (Diodes Inc)	SMAJ85A-TP (Micro Commercial)
Manufacturer	Vishay	STMicroelectronics	MDD	Diodes Incorporated	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	85V	85V	85V	85V	85V
Voltage - Breakdown (Min)	94.4V	94V	94.4V	94.4V	94.4V
Voltage - Clamping (Max) @ Ipp	137V	146V	137V	137V	137V
Current - Peak Pulse (10/1000µs)	2.2A	22.5A (8/20µs)	2.9A	2.9A	2.9A
Power - Peak Pulse	300W	600W	400W	400W	400W
Operating Temperature Range	-55 to 150°C (TJ)	-55 to 175°C (TJ)	-50 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 175°C (TA)
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

All identified substitute parts maintain active production status and ROHS3 compliance. Selection among substitutes should be based on the following factors:

Electrical Performance Alignment: SMAJ85A (MDD), SMAJ85A-13-F (Diodes Incorporated), and SMAJ85A-TP (Micro Commercial Co) provide the closest electrical match to the SMAJ85A-M3/61, with identical clamping voltage (137V) and comparable peak pulse current ratings (2.9A). These parts are suitable for direct replacement in applications where the original 300W peak pulse power specification is adequate.

Enhanced Performance Option: SMA6J85A-TR (STMicroelectronics) offers higher peak pulse current (22.5A at 8/20µs) and power dissipation (600W), providing additional margin for transient protection. This part is suitable for applications requiring higher energy absorption capacity while maintaining the same 85V reverse standoff voltage class.

Temperature Operating Range: SMAJ85A-TP (Micro Commercial Co) and SMA6J85A-TR (STMicroelectronics) extend the upper operating temperature to 175°C, compared to 150°C for the original part. This consideration applies to high-temperature environments.

Inventory and Availability: All substitute parts are available in production quantities. Selection may be influenced by supply chain requirements and lead time considerations.

Frequently Asked Questions (FAQ)

Q: Can SMA6J85A-TR be used as a direct replacement for SMAJ85A-M3/61?

A: SMA6J85A-TR is electrically compatible as a substitute. It maintains the same 85V reverse standoff voltage and DO-214AC (SMA) package. However, it features higher peak pulse current (22.5A vs 2.2A) and clamping voltage (146V vs 137V). Verify that the application circuit can accommodate these parameter differences before substitution.

Q: What is the primary difference between SMAJ85A (MDD) and SMAJ85A-13-F (Diodes Incorporated)?

A: Both parts share identical electrical specifications (85V standoff, 137V clamping, 2.9A peak pulse current, 400W power). The primary difference is manufacturer. SMAJ85A-13-F extends the operating temperature range to -55°C (vs -50°C for MDD variant). Selection depends on temperature requirements and supplier availability.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. All identified substitute parts are supplied in Tape & Reel (TR) packaging format, maintaining compatibility with automated assembly processes.

Q: Do all substitute parts meet ROHS3 compliance?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, meeting regulatory requirements for hazardous substance restrictions.

Q: What is the significance of the different peak pulse current measurement standards (10/1000µs vs 8/20µs)?

A: Peak pulse current is specified under different waveform standards depending on manufacturer test methodology. The 10/1000µs standard (used for SMAJ85A variants) and 8/20µs standard (used for SMA6J85A-TR) represent different transient pulse profiles. Both are valid specifications; application suitability depends on the actual transient waveform present in the circuit.

Q: Can SMAJ85A-TP be used in applications requiring -55°C minimum operating temperature?

A: Yes. SMAJ85A-TP is rated for -55°C minimum operating temperature, matching the original SMAJ85A-M3/61 specification.

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