SMCJ85A-M3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ85A-M3/9AT 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 category with a 137V maximum clamping voltage and 10.9A peak pulse current rating. The device is designed for general-purpose transient protection applications and is classified as Active product status with full RoHS3 compliance. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AB (SMC) package family.

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)	10.9	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SMCJ85A-M3/9AT are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Voltage - Reverse Standoff (Typ): 85V
Voltage - Clamping (Max) @ Ipp: 137V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Parts are classified into two categories:

Direct Equivalents: Parts with identical reverse standoff voltage (85V), clamping voltage (137V), and DO-214AB SMC package. These include SMCJ85A-E3/57T (Vishay), SMCJ85A (MDD), SMCJ85A-13-F (Diodes Incorporated), and SMDJ85A (Alpha & Omega Semiconductor). Peak pulse current ratings vary between 10.4A and 21.9A, with corresponding power dissipation differences.

Higher Performance Alternatives: Parts with enhanced power handling or current capacity while maintaining the 85V reverse standoff and 137V clamping specifications. The 5.0SMDJ85A (Taiwan Semiconductor Corporation) provides 36.5A peak pulse current and 5000W power rating. The SM15T100A (STMicroelectronics) operates at 85.5V reverse standoff with 178V clamping voltage and 56A peak pulse current.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package
SMCJ85A-M3/9AT	Vishay	85	137	10.9	1500	-55 to 150	DO-214AB, SMC
SMCJ85A-E3/57T	Vishay	85	137	10.9	1500	-55 to 150	DO-214AB, SMC
SMCJ85A	MDD	85	137	11	1500	-50 to 150	DO-214AB, SMC
SMCJ85A-13-F	Diodes Incorporated	85	137	10.4	1500	-55 to 150	DO-214AB, SMC
SMDJ85A	Alpha & Omega Semiconductor	85	137	21.9	3000	-55 to 150	DO-214AB, SMC
5.0SMDJ85A	Taiwan Semiconductor Corporation	85	137	36.5	5000	-55 to 175	DO-214AB, SMC
SM15T100A	STMicroelectronics	85.5	178	56	1500	-55 to 150	DO-214AB, SMC

Engineering Selection Recommendations

Direct Substitution (Preferred): SMCJ85A-E3/57T, SMCJ85A (MDD), SMCJ85A-13-F, and SMDJ85A are direct functional equivalents with identical voltage specifications and DO-214AB SMC packaging. All substitute parts maintain RoHS3 compliance and Active product status. Selection among these options depends on availability, lead time, and cost considerations. The SMCJ85A-E3/57T from Vishay provides the closest electrical match with identical current and power ratings.

Enhanced Performance Alternatives: The 5.0SMDJ85A offers superior transient energy absorption with 5000W peak pulse power and extended operating temperature range to 175°C, suitable for applications requiring higher surge current handling. The SM15T100A provides the highest peak pulse current (56A) with elevated clamping voltage (178V), appropriate for applications with more severe transient conditions.

Compliance Verification: All listed substitute parts maintain RoHS3 compliance, REACH unaffected status, and EAR99 export classification consistent with the original SMCJ85A-M3/9AT specification.

Frequently Asked Questions (FAQ)

Q: Can SMCJ85A-E3/57T directly replace SMCJ85A-M3/9AT? A: Yes. Both parts share identical electrical specifications (85V reverse standoff, 137V clamping, 10.9A peak pulse current, 1500W power rating) and DO-214AB SMC packaging. The difference is packaging format (tape & reel variant).

Q: What is the difference between SMCJ85A and SMDJ85A? A: Both maintain 85V reverse standoff and 137V clamping voltage with DO-214AB SMC packaging. SMDJ85A provides higher peak pulse current (21.9A) and power dissipation (3000W) compared to SMCJ85A (10.9A, 1500W). Selection depends on transient energy requirements.

Q: Is SM15T100A a suitable substitute? A: SM15T100A operates at 85.5V reverse standoff with elevated clamping voltage (178V) and significantly higher peak pulse current (56A). It is suitable only if the application can tolerate higher clamping voltage and requires enhanced transient suppression capability.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, consistent with the original SMCJ85A-M3/9AT specification.

Q: What packaging options are available? A: All substitute parts use DO-214AB (SMC) surface mount package. Packaging format variants include Tape & Reel (TR) and Cut Tape (CT) options, which do not affect electrical performance or mechanical compatibility.

Q: Can I use 5.0SMDJ85A in place of SMCJ85A-M3/9AT? A: Yes, with consideration for enhanced performance. The 5.0SMDJ85A maintains identical voltage specifications but provides 36.5A peak pulse current and 5000W power rating. It is suitable for applications requiring higher transient energy absorption and operates to 175°C.

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