SMCJ6.5-E3/57T Equivalent & Substitute Parts

Part Overview

The SMCJ6.5-E3/57T is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 6.5V reverse standoff voltage and provides 12.3V clamping at peak pulse current. The device is currently obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	6.5V
Breakdown Voltage (Min)	7.22V
Clamping Voltage (Max) @ Ipp	12.3V
Peak Pulse Current (10/1000µs)	122A
Peak Pulse Power	1500W
Operating Temperature Range	-55°C to 150°C (TJ)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SMCJ6.5-E3/57T is determined by the following critical parameters:

Electrical Compatibility Criteria:

Reverse standoff voltage: 6.5V (fixed across all substitutes)
Breakdown voltage minimum: 7.22V (fixed across all substitutes)
Unidirectional channel configuration: 1 channel (fixed across all substitutes)
Type: Zener diode (fixed across all substitutes)

Mechanical Compatibility Criteria:

Package / Case: DO-214AB, SMC (required for PCB footprint compatibility)
Mounting type: Surface Mount (required for assembly process compatibility)

Allowable Variation Parameters:

Clamping voltage (Max) @ Ipp: 11.2V to 12.3V (acceptable range for general-purpose protection)
Peak pulse current: 122A to 267.9A (higher current capability acceptable for same voltage class)
Peak pulse power: 1500W to 3000W (higher power rating acceptable)
Operating temperature range: -55°C to 175°C (extended ranges acceptable)

Substitutes are grouped into two categories based on peak pulse power rating: 1500W devices (direct electrical equivalents) and 3000W devices (enhanced protection capability with same voltage characteristics).

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Operating Temp (°C)	Package	Status
SMCJ6.5-E3/57T	Vishay	6.5	7.22	12.3	122	1500	-55 to 150	DO-214AB	Obsolete
SMCJ6.5A-E3/57T	Vishay	6.5	7.22	11.2	133.9	1500	-55 to 150	DO-214AB	Active
SMCJ6.5E3/TR13	Microchip Technology	6.5	7.22	12.3	122	1500	-65 to 150	DO-214AB	Active
SMCJ6.5A	Taiwan Semiconductor Corporation	6.5	7.22	11.2	140	1500	-55 to 150	DO-214AB	Active
SMCJ6.5A-13-F	Diodes Incorporated	6.5	7.22	11.2	133.9	1500	-55 to 150	DO-214AB	Active
SMCJ6.5AE3/TR13	Microchip Technology	6.5	7.22	11.2	133.9	1500	-65 to 150	DO-214AB	Active
SMDJ6.5A	Alpha & Omega Semiconductor Inc.	6.5	7.22	11.2	267.9	3000	-55 to 150	DO-214AB	Active
SMLJ6.5A	Bourns Inc.	6.5	7.22	11.2	267.9	3000	-55 to 150	DO-214AB	Active
SMLJ6.5A-TP	Micro Commercial Co	6.5	7.22	11.2	267.9	3000	-55 to 175	DO-214AB	Active
SMLJ6.5AE3/TR13	Microchip Technology	6.5	7.22	11.2	267.9	300	-55 to 150	DO-214AB	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (1500W Rating):

SMCJ6.5E3/TR13 (Microchip Technology) provides the closest electrical match with identical 12.3V clamping voltage and 122A peak pulse current. This part is active and ROHS3 compliant with extended operating temperature range (-65°C to 150°C). Selection is appropriate for applications requiring exact voltage clamping characteristics of the original part.

SMCJ6.5A-E3/57T (Vishay) maintains the same manufacturer lineage as the obsolete part with active status. Clamping voltage is reduced to 11.2V with increased peak pulse current (133.9A), suitable for applications where slightly lower clamping voltage is acceptable.

SMCJ6.5A (Taiwan Semiconductor Corporation) and SMCJ6.5A-13-F (Diodes Incorporated) offer 1500W rated alternatives with 11.2V clamping and 133.9A to 140A peak pulse current. Both are active and ROHS3 compliant.

SMCJ6.5AE3/TR13 (Microchip Technology) combines 11.2V clamping with extended temperature range (-65°C to 150°C) and active status.

Enhanced Protection Alternatives (3000W Rating):

SMDJ6.5A (Alpha & Omega Semiconductor Inc.), SMLJ6.5A (Bourns Inc.), and SMLJ6.5A-TP (Micro Commercial Co) provide doubled peak pulse power (3000W) with 267.9A peak pulse current while maintaining 6.5V reverse standoff and 11.2V clamping voltage. These are suitable for applications requiring higher transient energy absorption. SMLJ6.5A-TP offers extended operating temperature to 175°C.

All substitute parts maintain DO-214AB surface-mount package compatibility, ROHS3 compliance, and MSL 1 moisture sensitivity rating. Selection should be based on specific application requirements for clamping voltage precision and transient energy handling capacity.

Frequently Asked Questions (FAQ)

Q: Can SMCJ6.5A-E3/57T directly replace SMCJ6.5-E3/57T?

A: Yes. Both parts share identical reverse standoff voltage (6.5V), breakdown voltage (7.22V), and package (DO-214AB). The clamping voltage difference (11.2V vs 12.3V) and increased peak pulse current (133.9A vs 122A) are within acceptable substitution parameters for general-purpose TVS applications. The SMCJ6.5A-E3/57T is active and maintains Vishay manufacturer continuity.

Q: What is the difference between 1500W and 3000W rated parts?

A: Peak pulse power rating indicates the maximum transient energy the device can dissipate during a 10/1000µs pulse. 3000W devices (SMDJ6.5A, SMLJ6.5A, SMLJ6.5A-TP) handle twice the transient energy compared to 1500W devices. Selection depends on the expected surge energy in the application circuit. Both ratings maintain identical voltage characteristics (6.5V standoff, 7.22V breakdown).

Q: Are all substitutes compatible with the original PCB footprint?

A: Yes. All listed substitutes use DO-214AB surface-mount package (SMC case), which maintains identical PCB footprint and assembly compatibility with the original SMCJ6.5-E3/57T.

Q: Does operating temperature range affect substitution suitability?

A: Operating temperature range affects suitability only if the application operates outside the specified range. The original part operates -55°C to 150°C. SMCJ6.5E3/TR13 and SMCJ6.5AE3/TR13 extend to -65°C. SMLJ6.5A-TP extends to 175°C. Selection should match or exceed the application's thermal requirements.

Q: What is the significance of the "A" designation in part numbers like SMCJ6.5A?

A: The "A" suffix indicates a specific voltage and current rating variant within the SMCJ6.5 base product family. SMCJ6.5A variants specify 11.2V clamping voltage with higher peak pulse current compared to non-"A" variants. This designation is consistent across multiple manufacturers (Vishay, Taiwan Semiconductor, Diodes Incorporated, Microchip).

Q: Can SMLJ6.5A series parts replace SMCJ6.5 series parts?

A: Yes, with consideration for power rating. SMLJ6.5A series parts provide 3000W peak pulse power versus 1500W for SMCJ6.5 series. All maintain identical voltage characteristics (6.5V standoff, 7.22V breakdown, 11.2V clamping). SMLJ series substitution is appropriate when higher transient energy absorption is required or beneficial.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance profile.

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