SMCJ85C-E3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ85C-E3/9AT is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with an 85V reverse standoff voltage and provides 151V maximum clamping voltage at peak pulse current. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	85V
Breakdown Voltage (Min)	94.4V
Clamping Voltage (Max) @ Ipp	151V
Peak Pulse Current (10/1000µs)	9.9A
Peak Pulse Power	1500W
Package Type	DO-214AB (SMC)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C to 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SMCJ85C-E3/9AT is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

Reverse standoff voltage: 85V (±tolerance)
Breakdown voltage minimum: 94.4V
Package type: DO-214AB (SMC) surface mount
Bidirectional channels: 1
Zener diode type
RoHS3 compliance
Moisture sensitivity level: 1

Acceptable Variation Parameters:

Clamping voltage: 137V to 151V (both values present in substitute parts)
Peak pulse current: 9.9A to 36.5A (higher current ratings provide enhanced protection margin)
Peak pulse power: 1500W to 5000W (higher power ratings acceptable)
Operating temperature range: -55°C to -65°C minimum; 150°C to 175°C maximum (wider ranges acceptable)
Product status: Active substitutes preferred over obsolete

Substitute parts are grouped into two categories: direct electrical equivalents (matching 151V clamping voltage) and enhanced-performance alternatives (137V clamping voltage with higher current/power ratings).

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamp Voltage (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Status
SMCJ85C-E3/9AT	Vishay	85	94.4	151	9.9	1500	DO-214AB (SMC)	Obsolete
SMCJ85CA-E3/9AT	Vishay	85	94.4	137	10.9	1500	DO-214AB (SMC)	Active
SMCJ85CE3/TR13	Microchip Technology	85	94.4	151	9.9	1500	DO-214AB (SMC)	Active
5.0SMDJ85CA	MDE Semiconductor Inc	85	94.4	137	36.5	5000	DO-214AB (SMC)	Active
5.0SMDJ85CA-T7	Littelfuse Inc.	85	94.4	137	36.5	5000	DO-214AB (SMC)	Active
5.0SMLJ85CA-TP	Micro Commercial Co	85	94.4	137	36.5	5000	DO-214AB (SMC)	Active
SMCJ85CA	Fairchild Semiconductor	85	94.4	137	11	1500	DO-214AB (SMC)	Active
SMCJ85CA-13-F	Diodes Incorporated	85	94.4	137	10.4	1500	DO-214AB (SMC)	Active
SMCJ85CA-HR	Littelfuse Inc.	85	94.4	137	11	1500	DO-214AB (SMC)	Active

Engineering Selection Recommendations

Direct Electrical Equivalent (Recommended Primary Choice): SMCJ85CE3/TR13 from Microchip Technology matches the original part's electrical specifications exactly, including 151V clamping voltage and 9.9A peak pulse current. This part is active and ROHS3 compliant, providing the most direct replacement path with no circuit redesign required.

Active Equivalent with Reduced Clamping Voltage: SMCJ85CA-E3/9AT from Vishay provides an active alternative from the original manufacturer with identical reverse standoff and breakdown voltages. The 137V clamping voltage represents a 14V reduction from the original specification, which remains within acceptable protection parameters for most general-purpose applications while offering improved current handling at 10.9A.

Enhanced Protection Alternatives: The 5.0SMDJ85CA, 5.0SMDJ85CA-T7, and 5.0SMLJ85CA-TP parts provide significantly higher peak pulse current (36.5A) and power dissipation (5000W) capabilities. These are suitable for applications requiring enhanced transient protection margins. All maintain the 85V reverse standoff voltage and 94.4V minimum breakdown voltage while offering 137V clamping voltage.

Standard Equivalent Options: SMCJ85CA from Fairchild Semiconductor, SMCJ85CA-13-F from Diodes Incorporated, and SMCJ85CA-HR from Littelfuse Inc. provide active alternatives with 137V clamping voltage and 1500W power rating, matching the original part's power dissipation capability. These are suitable for direct substitution in applications where the lower clamping voltage is acceptable.

All recommended substitutes are ROHS3 compliant with MSL 1 rating and surface-mount DO-214AB (SMC) packaging, ensuring compatibility with existing PCB designs and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 137V clamping voltage instead of the original 151V? A: Yes. The 137V clamping voltage remains within the acceptable protection range for the 85V reverse standoff voltage class. The lower clamping voltage provides faster response to transient events while maintaining protection of downstream components rated for standard industrial voltage margins.

Q: What is the difference between the 1500W and 5000W power-rated parts? A: The 5000W parts (5.0SMDJ85CA series) handle higher peak pulse currents (36.5A versus 9.9A to 11A) and dissipate greater energy during transient events. These are suitable for applications with higher energy transients or where additional protection margin is required. Both are electrically compatible with the original circuit.

Q: Are all substitute parts compatible with the original PCB layout? A: Yes. All substitute parts use the DO-214AB (SMC) surface-mount package with identical pinout and footprint. No PCB redesign is required for any listed substitute.

Q: Why is SMCJ85CE3/TR13 from Microchip recommended as the primary choice? A: This part provides exact electrical matching to the original SMCJ85C-E3/9AT, including identical 151V clamping voltage and 9.9A peak pulse current. It is currently active and ROHS3 compliant, eliminating any circuit performance variation.

Q: Can I mix different substitute parts in the same design? A: Yes. All listed substitutes meet the core electrical requirements (85V reverse standoff, 94.4V minimum breakdown, DO-214AB package). However, for consistency in production and testing, using a single part number across a design is recommended.

Q: What is the significance of the ROHS3 compliance and MSL 1 rating? A: ROHS3 compliance ensures the part meets current environmental and hazardous substance restrictions for commercial and industrial applications. MSL 1 (Unlimited) indicates the part has no moisture sensitivity limitations, allowing standard storage and handling without special precautions.

Q: Are there any temperature range differences I should consider? A: Most substitutes operate from -55°C to 150°C, matching the original. SMCJ85CE3/TR13 extends to -65°C minimum, and 5.0SMLJ85CA-TP extends to 175°C maximum. These wider ranges provide additional operational margin in extreme temperature environments.

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