Equivalent & Substitute Parts for SMCJ8.5 Transient Voltage Suppressor

Part Overview

The SMCJ8.5 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features an 8.5V reverse standoff voltage with a 15.12V maximum clamping voltage at peak pulse current of 104.2A, housed in a DO-214AB (SMC) package. The SMCJ8.5 is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	8.5	V
Voltage - Breakdown (Min)	8.93	V
Voltage - Clamping (Max) @ Ipp	15.12	V
Current - Peak Pulse (10/1000µs)	104.2	A
Power - Peak Pulse	1500	W
Type	Zener	—
Unidirectional Channels	1	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMCJ8.5 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Reverse standoff voltage: 8.5V (±tolerance)
Unidirectional channel configuration: 1 channel
Package type: DO-214AB (SMC) surface mount
Peak pulse current capability: 104.2A minimum
Peak pulse power dissipation: 1500W minimum
Zener diode type classification
Operating temperature range: minimum -55°C to 150°C

Acceptable Variation Range:

Clamping voltage: 13.6V to 15.12V at peak pulse current
Breakdown voltage (minimum): 8.89V to 9.5V
Peak pulse current: 100A to 110.3A

Substitute parts must satisfy all critical matching parameters. Variations in clamping voltage and peak pulse current within the specified ranges are acceptable provided the part maintains the same functional voltage class and thermal performance envelope.

Parameter Comparison

Part Number	Manufacturer	Vwm (V)	Vc (V)	Ipp (A)	Ppk (W)	Toper (°C)	Status
SMCJ8.5	Littelfuse Inc.	8.5	15.12	104.2	1500	-55 to 150	Obsolete
SMCJ8.5A	EVVO Semi	8.5	14.4	104.2	1500	-55 to 150	Active
1.5SMC10A-E3/57T	Vishay General Semiconductor	8.55	14.5	103	1500	-65 to 150	Active
SMCJ8.5A-13-F	Diodes Incorporated	8.5	14.4	104.2	1500	-55 to 150	Active
SMCJ8.5A-TP	Micro Commercial Co	8.5	14.4	104.2	1500	-55 to 175	Active
SMCJ8.5AE3/TR13	Microchip Technology	8.5	13.6	110.3	1500	-65 to 150	Active
SMCJ8.5E3/TR13	Microchip Technology	8.5	15.0	100	1500	-65 to 150	Active
SMCJ8V5A	Fairchild Semiconductor	8.5	14.4	104.2	1500	—	Active
SMLJ8.5A	Bourns Inc.	8.5	14.4	208.4	3000	-55 to 150	Active
SMLJ8.5A-TP	Micro Commercial Co	8.5	14.4	208.4	3000	-55 to 175	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (1500W Class):

SMCJ8.5A (EVVO Semi), SMCJ8.5A-13-F (Diodes Incorporated), SMCJ8.5A-TP (Micro Commercial Co), and SMCJ8V5A (Fairchild Semiconductor) provide direct functional equivalence to the SMCJ8.5. These parts maintain identical reverse standoff voltage (8.5V), peak pulse current (104.2A), and power dissipation (1500W) specifications. All are ROHS3 compliant with MSL 1 rating. SMCJ8.5A-TP offers extended operating temperature range to 175°C.

Manufacturer-Recommended Alternatives:

Microchip Technology offers two variants: SMCJ8.5AE3/TR13 with slightly lower clamping voltage (13.6V) and higher peak pulse current (110.3A), and SMCJ8.5E3/TR13 with clamping voltage closer to the original (15.0V) and peak pulse current of 100A. Both support extended temperature range to -65°C. Vishay's 1.5SMC10A-E3/57T (TransZorb® series) provides equivalent performance with 8.55V standoff voltage and 14.5V clamping voltage.

Higher Power Alternative (3000W Class):

SMLJ8.5A (Bourns Inc.) and SMLJ8.5A-TP (Micro Commercial Co) maintain the same voltage class but provide doubled peak pulse current (208.4A) and power dissipation (3000W). These are suitable for applications requiring enhanced transient energy absorption while maintaining the same protection voltage threshold. SMLJ8.5A-TP offers extended temperature range to 175°C.

Compliance and Availability:

All recommended substitutes are ROHS3 compliant and carry MSL 1 rating. Active product status ensures long-term availability and supply chain stability. Selection should prioritize parts with confirmed inventory levels and established distribution channels.

Frequently Asked Questions (FAQ)

Q: Can SMLJ8.5A or SMLJ8.5A-TP be used as direct replacements for SMCJ8.5?

A: SMLJ series parts are functionally compatible from a voltage protection standpoint, maintaining the same 8.5V reverse standoff and 14.4V clamping voltage. However, they feature doubled peak pulse current (208.4A) and power dissipation (3000W). These higher ratings do not create incompatibility; they provide enhanced transient suppression capability. PCB layout and thermal management considerations remain unchanged due to identical DO-214AB package geometry.

Q: What is the difference between SMCJ8.5A-TP and SMCJ8.5A-13-F?

A: Both parts share identical electrical specifications (8.5V standoff, 14.4V clamping, 104.2A peak current, 1500W power). SMCJ8.5A-TP is manufactured by Micro Commercial Co with extended operating temperature to 175°C, while SMCJ8.5A-13-F is from Diodes Incorporated with standard -55°C to 150°C range. Selection depends on thermal environment requirements and preferred supplier qualification.

Q: Are Microchip variants SMCJ8.5AE3/TR13 and SMCJ8.5E3/TR13 interchangeable?

A: Both Microchip parts maintain the 8.5V reverse standoff voltage and 1500W power rating. SMCJ8.5AE3/TR13 provides higher peak pulse current (110.3A) with lower clamping voltage (13.6V), while SMCJ8.5E3/TR13 offers lower peak pulse current (100A) with higher clamping voltage (15.0V). Selection should match the specific circuit protection requirement: choose SMCJ8.5AE3/TR13 for circuits requiring maximum current handling; choose SMCJ8.5E3/TR13 for circuits requiring clamping voltage closer to the original SMCJ8.5 specification.

Q: Does package designation affect substitution compatibility?

A: All listed substitutes use DO-214AB (SMC) surface-mount package with identical footprint and thermal characteristics. Packaging variations (Cut Tape, Tape & Reel, Bulk) refer to supply format only and do not affect electrical or mechanical compatibility. Verify supplier device package designation matches DO-214AB or SMC to ensure PCB assembly compatibility.

Q: What compliance certifications apply to all substitute parts?

A: All recommended substitutes are ROHS3 compliant and carry Moisture Sensitivity Level 1 (unlimited shelf life). Specific REACH status varies by manufacturer; verify individual part documentation for applications requiring REACH compliance confirmation.

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