SMCJ8.5A-M3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ8.5A-M3/9AT 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 performance parameters and mechanical compatibility within the DO-214AB (SMC) package family.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	8.5	V
Voltage - Breakdown (Min)	9.44	V
Voltage - Clamping (Max) @ Ipp	14.4	V
Current - Peak Pulse (10/1000µs)	104.2	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMCJ8.5A-M3/9AT are classified based on strict electrical and mechanical parameter matching:

Direct Electrical Equivalents match all critical parameters: Voltage - Reverse Standoff (8.5V typical), Voltage - Clamping (14.4V maximum), Current - Peak Pulse (104.2A), Power - Peak Pulse (1500W), and package type (DO-214AB, SMC). These parts are interchangeable without circuit redesign.

Manufacturer Variants include the same electrical specifications but differ in packaging designation (Tape & Reel variants with different supplier device package codes) or manufacturer sourcing. These maintain full electrical compatibility.

Recommended Alternatives include parts with minor parameter variations within acceptable tolerance ranges. The 1.5SMC10A exhibits slightly higher reverse standoff voltage (8.55V) and peak pulse current (108A) but maintains the same clamping voltage (14.4V) and power rating (1500W). The SMDJ8.5A maintains identical voltage parameters but doubles the peak pulse current (208.4A) and power rating (3000W), suitable for higher transient energy applications.

Temperature-Extended Variants such as SMCJ8.5A-TP extend the operating temperature range to 175°C, providing enhanced thermal performance while maintaining all voltage and current specifications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Status
SMCJ8.5A-M3/9AT	Vishay	8.5	14.4	104.2	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ8.5A-E3/57T	Vishay	8.5	14.4	104.2	1500	-55 to 150	DO-214AB (SMCJ)	Active
SMCJ8.5A	EVVO Semi	8.5	14.4	104.2	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ8.5A-13-F	Diodes Incorporated	8.5	14.4	104.2	1500	-55 to 150	DO-214AB (SMC)	Active
SMCJ8.5A-TP	Micro Commercial Co	8.5	14.4	104.2	1500	-55 to 175	DO-214AB (SMC)	Active
1.5SMC10A	Taiwan Semiconductor	8.55	14.5	108	1500	-55 to 150	DO-214AB (SMC)	Active
SMDJ8.5A	Alpha & Omega Semiconductor	8.5	14.4	208.4	3000	-55 to 150	DO-214AB (SMC)	Active

Engineering Selection Recommendations

Direct Substitution (Identical Electrical Performance): SMCJ8.5A-E3/57T, SMCJ8.5A (EVVO Semi), and SMCJ8.5A-13-F are direct electrical equivalents with identical voltage, current, and power specifications. All are Active status, RoHS3 compliant, and MSL 1 rated. Selection among these depends on packaging availability (Tape & Reel versus Cut Tape) and supplier inventory.

Temperature-Enhanced Substitution: SMCJ8.5A-TP maintains all electrical specifications while extending the operating temperature range to 175°C. This variant is suitable for applications requiring enhanced thermal performance and is recommended for high-temperature environments.

Higher Energy Capability: SMDJ8.5A provides identical voltage regulation (8.5V standoff, 14.4V clamping) but doubles the peak pulse current (208.4A) and power dissipation (3000W). This part is suitable for applications experiencing higher transient energy levels while maintaining the same voltage protection class.

Minor Parameter Tolerance: 1.5SMC10A exhibits a 0.05V higher reverse standoff voltage (8.55V versus 8.5V) and 0.1V higher clamping voltage (14.5V versus 14.4V), with 3.8A higher peak pulse current (108A versus 104.2A). This part remains functionally compatible for general-purpose protection but should be evaluated for applications with strict voltage regulation requirements.

All substitute parts maintain RoHS3 compliance, MSL 1 rating, and Active product status.

Frequently Asked Questions (FAQ)

Q: Can SMCJ8.5A-E3/57T be used as a direct replacement for SMCJ8.5A-M3/9AT? A: Yes. Both parts share identical electrical specifications: 8.5V reverse standoff, 14.4V clamping voltage, 104.2A peak pulse current, and 1500W power rating. The difference is in the supplier device package designation (SMCJ versus SMC), which does not affect electrical performance or mechanical fit in DO-214AB footprints.

Q: What is the difference between SMCJ8.5A and SMDJ8.5A? A: Both maintain the same voltage protection parameters (8.5V standoff, 14.4V clamping). The SMDJ8.5A is rated for double the peak pulse current (208.4A versus 104.2A) and double the power dissipation (3000W versus 1500W). Select SMDJ8.5A for applications with higher transient energy requirements.

Q: Is SMCJ8.5A-TP compatible with the original part? A: Yes. SMCJ8.5A-TP is electrically identical to SMCJ8.5A-M3/9AT with the same voltage and current ratings. The only difference is an extended operating temperature range (-55°C to 175°C versus -55°C to 150°C), making it suitable for higher-temperature applications.

Q: Can 1.5SMC10A replace SMCJ8.5A-M3/9AT? A: 1.5SMC10A is functionally compatible with minor parameter variations. It has a 0.05V higher reverse standoff voltage (8.55V) and 0.1V higher clamping voltage (14.5V), with slightly higher peak pulse current (108A). For applications with strict voltage regulation tolerances, verify compatibility before substitution.

Q: Are all substitute parts available in the same packaging? A: All substitute parts use the DO-214AB (SMC) surface mount package. Packaging variants differ in tape designation (Tape & Reel, Cut Tape, or Digi-Reel) but maintain identical mechanical footprints and land patterns.

Q: Do all substitute parts meet the same compliance standards? A: Yes. All listed substitute parts are RoHS3 compliant, MSL 1 rated, and carry Active product status. REACH compliance is confirmed for all parts except where not applicable.

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