SMCJ85C Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMCJ85C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features an 85V reverse standoff voltage with a 143.85V maximum clamping voltage and 11A peak pulse current capability in a surface-mount DO-214AB (SMC) package. The SMCJ85C is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMCJ85C
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	85V
Voltage - Breakdown (Min)	89.28V
Voltage - Clamping (Max) @ Ipp	143.85V
Current - Peak Pulse (10/1000µs)	11A
Power - Peak Pulse	1500W
Operating Temperature Range	-55°C to 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SMCJ85C is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Reverse standoff voltage: 85V (nominal)
Breakdown voltage minimum: 89.28V to 94.4V range
Package type: DO-214AB / SMC surface mount
Bidirectional configuration: Single channel
Zener diode type classification
Operating temperature range: Minimum -55°C, maximum 150°C or higher
RoHS3 compliance

Acceptable Variation Parameters:

Clamping voltage: 137V to 178V (within transient suppression design margins)
Peak pulse current: 10.4A to 56A (higher ratings provide enhanced protection capability)
Peak pulse power: 1500W to 5000W (higher ratings acceptable for same application)

Substitute parts must maintain the 85V standoff voltage specification and DO-214AB package form factor. Variations in clamping voltage and peak current are acceptable when the substitute part meets or exceeds the original electrical performance envelope for the protected circuit.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Operating Temp Range	Product Status	Package
SMCJ85C	Littelfuse Inc.	85V	89.28V	143.85V	11A	1500W	-55°C to 150°C	Obsolete	DO-214AB (SMC)
SMCJ85CA	Fairchild Semiconductor	85V	94.4V	137V	11A	1500W	-55°C to 150°C	Active	DO-214AB (SMC)
5.0SMLJ85CA-TP	Micro Commercial Co	85V	94.4V	137V	36.5A	5000W	-55°C to 175°C	Active	DO-214AB (SMC)
SMCJ85CA-13-F	Diodes Incorporated	85V	94.4V	137V	10.4A	1500W	-55°C to 150°C	Active	DO-214AB (SMC)
SMCJ85CA-TR	STMicroelectronics	85V	94V	178V	56A (8/20µs)	1500W	-55°C to 150°C	Active	DO-214AB (SMC)
SMCJ85CAE3/TR13	Microchip Technology	85V	94.4V	137V	10.4A	1500W	-65°C to 150°C	Active	DO-214AB (SMC)
SMCJ85CE3/TR13	Microchip Technology	85V	94.4V	151V	9.9A	1500W	-65°C to 150°C	Active	DO-214AB (SMC)
SMLJ85CA	Bourns Inc.	85V	94.4V	137V	20.8A	3000W	-55°C to 150°C	Active	DO-214AB (SMC)
SMLJ85CA-TP	Micro Commercial Co	85V	94.4V	137V	20.8A	3000W	-55°C to 175°C	Active	DO-214AB (SMC)

Engineering Selection Recommendations

All identified substitute parts maintain active product status with current manufacturer support, ensuring long-term availability and design continuity. Selection among equivalent parts should be based on the following criteria:

Direct Electrical Equivalents (Recommended Primary Substitutes): SMCJ85CA (Fairchild Semiconductor), SMCJ85CA-13-F (Diodes Incorporated), SMCJ85CAE3/TR13 (Microchip Technology), and SMCJ85CE3/TR13 (Microchip Technology) provide electrical performance within the original SMCJ85C specification envelope. These parts maintain 85V standoff voltage, 1500W peak pulse power, and -55°C to 150°C operating temperature range (or extended to -65°C for Microchip variants). Clamping voltages range from 137V to 151V, representing acceptable variation within transient suppression design margins.

Enhanced Performance Alternatives: SMLJ85CA (Bourns Inc.) and SMLJ85CA-TP (Micro Commercial Co) offer increased peak pulse current (20.8A) and power dissipation (3000W) while maintaining the 85V standoff voltage and DO-214AB package. These parts provide superior transient energy absorption capability for applications requiring enhanced overvoltage protection margins.

High-Performance Variant: 5.0SMLJ85CA-TP (Micro Commercial Co) delivers maximum transient suppression performance with 36.5A peak pulse current and 5000W peak pulse power. Extended operating temperature range to 175°C accommodates high-ambient-temperature applications. This variant is suitable for demanding industrial and automotive protection circuits.

All substitute parts comply with RoHS3 requirements and maintain surface-mount DO-214AB packaging for direct PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMCJ85CA directly replace SMCJ85C in existing designs? A: Yes. SMCJ85CA maintains identical 85V standoff voltage, DO-214AB package, and 1500W peak pulse power rating. The 137V clamping voltage (versus 143.85V original) represents acceptable variation within transient suppression design margins. No circuit redesign is required.

Q: What is the difference between SMCJ85CA and SMLJ85CA? A: Both parts share the 85V standoff voltage and DO-214AB package. SMLJ85CA provides doubled peak pulse current (20.8A versus 11A) and doubled power dissipation (3000W versus 1500W). Selection depends on transient energy requirements of the protected circuit. SMLJ85CA is suitable for higher-energy transient environments.

Q: Are Microchip SMCJ85CAE3/TR13 and SMCJ85CE3/TR13 interchangeable? A: Both parts are Microchip equivalents with identical 85V standoff voltage and DO-214AB package. SMCJ85CAE3/TR13 provides 137V clamping voltage with 10.4A peak current. SMCJ85CE3/TR13 provides 151V clamping voltage with 9.9A peak current. Selection depends on specific clamping voltage requirement for the protected circuit. Extended temperature range (-65°C to 150°C) is identical for both variants.

Q: Why does 5.0SMLJ85CA-TP have significantly higher current and power ratings? A: The 5.0SMLJ85CA-TP designation indicates a higher-performance TVS diode variant within the 85V standoff family. The 36.5A peak pulse current and 5000W power rating provide enhanced transient suppression for circuits experiencing high-energy voltage transients. This part is suitable for industrial power distribution, automotive, and telecommunications applications requiring maximum protection capability.

Q: Can I use a substitute part with higher clamping voltage than the original SMCJ85C? A: Yes. The original SMCJ85C specifies 143.85V maximum clamping voltage. Substitute parts with 137V to 178V clamping voltage are acceptable. Higher clamping voltages provide additional protection margin for the protected circuit. Lower clamping voltages (137V) represent tighter suppression and are preferred for sensitive analog circuits.

Q: What is the significance of the -TP and -TR suffixes in part numbers? A: -TP indicates Tape & Reel or Bulk packaging for automated assembly. -TR indicates Cut Tape & Digi-Reel packaging. Both packaging formats are suitable for surface-mount PCB assembly. Selection depends on manufacturing process requirements and inventory management preferences.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All identified substitute parts comply with RoHS3 requirements, ensuring compatibility with modern electronics manufacturing standards and environmental regulations.

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