SMCJ6.5 Transient Voltage Suppressor (TVS) Diode — Equivalent & Substitute Parts

Part Overview

The SMCJ6.5 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 6.5V reverse standoff voltage, 11.76V maximum clamping voltage, and 134A peak pulse current capability in a DO-214AB (SMC) package.

The SMCJ6.5 is classified as obsolete. Equivalent and substitute parts from active manufacturers are available to maintain design continuity and ensure supply chain reliability for applications requiring 6.5V TVS protection.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	6.5	V
Voltage - Breakdown (Min)	6.84	V
Voltage - Clamping (Max) @ Ipp	11.76	V
Current - Peak Pulse (10/1000µs)	134	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	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMCJ6.5 are grouped based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Reverse standoff voltage: 6.5V (fixed)
Breakdown voltage minimum: 7.22V or 7.84V (within tolerance band)
Clamping voltage: 11.2V to 12.3V (acceptable range for 6.5V class devices)
Peak pulse current: 122A to 268A (dependent on package power rating)
Package: DO-214AB / SMC (surface mount, same footprint)
Mounting type: Surface Mount (required)
Type: Zener, unidirectional (functional equivalence)
Operating temperature: -55°C to 150°C minimum (or extended range)
RoHS3 compliance: Required for modern supply chains

Grouping Logic:

Group 1 (1500W class): SMCJ6.5A, SMCJ6.5A-13-F, SMCJ6.5AE3/TR13, SMCJ6.5E3/TR13, TV15C6V5J-HF — Peak pulse current 122A–140A, clamping voltage 11.2V–12.3V
Group 2 (3000W class): SMLJ6.5A, SMLJ6.5A-TP, SMLJ6.5AE3/TR13, TV30C6V5J-G — Peak pulse current 268A, clamping voltage 11.2V, higher power dissipation capability

All substitute parts maintain the same reverse standoff voltage (6.5V), unidirectional topology, and DO-214AB package footprint as the original SMCJ6.5.

Parameter Comparison

Part Number	Manufacturer	Status	Vwm (V)	Vc (Max) @ Ipp (V)	Ipp (A)	Ppk (W)	Tj Range (°C)	Package
SMCJ6.5	Littelfuse Inc.	Obsolete	6.5	11.76	134	1500	-55 to 150	DO-214AB
SMCJ6.5A	Taiwan Semiconductor	Active	6.5	11.2	140	1500	-55 to 150	DO-214AB
SMCJ6.5A-13-F	Diodes Incorporated	Active	6.5	11.2	133.9	1500	-55 to 150	DO-214AB
SMCJ6.5AE3/TR13	Microchip Technology	Active	6.5	11.2	133.9	1500	-65 to 150	DO-214AB
SMCJ6.5E3/TR13	Microchip Technology	Active	6.5	12.3	122	1500	-65 to 150	DO-214AB
SMLJ6.5A	Bourns Inc.	Active	6.5	11.2	267.9	3000	-55 to 150	DO-214AB
SMLJ6.5A-TP	Micro Commercial Co	Active	6.5	11.2	267.9	3000	-55 to 175	DO-214AB
SMLJ6.5AE3/TR13	Microchip Technology	Active	6.5	11.2	267.9	300	-55 to 150	DO-214AB
TV15C6V5J-HF	Comchip Technology	Active	6.5	11.2	133.93	1500	-55 to 150	DO-214AB
TV30C6V5J-G	Comchip Technology	Active	6.5	11.2	267.86	3000	-55 to 150	DO-214AB

Engineering Selection Recommendations

For Direct Replacement (1500W Class): SMCJ6.5A (Taiwan Semiconductor) and SMCJ6.5A-13-F (Diodes Incorporated) are the primary active alternatives. Both maintain electrical parameters within the original specification envelope and are in active production status. SMCJ6.5AE3/TR13 (Microchip Technology) extends the operating temperature range to -65°C and is suitable for applications requiring enhanced low-temperature performance.

For Higher Transient Energy Absorption (3000W Class): SMLJ6.5A (Bourns Inc.), SMLJ6.5A-TP (Micro Commercial Co), TV30C6V5J-G (Comchip Technology), and SMLJ6.5AE3/TR13 (Microchip Technology) provide doubled peak pulse current and power dissipation. These are appropriate for circuits experiencing higher transient stress or requiring additional margin. SMLJ6.5A-TP offers the widest operating temperature range (-55°C to 175°C).

Compliance Considerations: All substitute parts are RoHS3 compliant and carry MSL 1 (unlimited moisture sensitivity). Selection should prioritize active production status and established supply availability. Taiwan Semiconductor, Diodes Incorporated, Microchip Technology, Bourns Inc., Micro Commercial Co, and Comchip Technology all maintain active product lines for 6.5V TVS diodes in DO-214AB packaging.

Frequently Asked Questions (FAQ)

Q: Can SMCJ6.5A directly replace SMCJ6.5? A: Yes. SMCJ6.5A maintains the same 6.5V reverse standoff voltage, DO-214AB package, and surface-mount footprint. The clamping voltage is slightly lower (11.2V vs. 11.76V), which is within acceptable tolerance for 6.5V class devices. Peak pulse current is comparable (140A vs. 134A).

Q: What is the difference between SMCJ and SMLJ series? A: SMCJ devices are rated for 1500W peak pulse power with peak pulse currents of 122–140A. SMLJ devices are rated for 3000W peak pulse power with peak pulse currents of 268A. Both use the same DO-214AB package and 6.5V standoff voltage. SMLJ is suitable for applications requiring higher transient energy absorption.

Q: Are all substitute parts available in tape-and-reel packaging? A: Most active substitutes are available in tape-and-reel (TR) format for automated assembly. Specific packaging options vary by manufacturer and distributor. Verify packaging availability with your supplier before design finalization.

Q: Does clamping voltage variation affect circuit compatibility? A: Clamping voltage determines the maximum voltage spike that reaches protected circuitry. The SMCJ6.5 clamps at 11.76V; substitutes clamp between 11.2V and 12.3V. For circuits designed around the original 11.76V specification, verify that downstream components tolerate the substitute's clamping voltage. Devices rated for 13V or higher are generally compatible.

Q: Can I use a 3000W part (SMLJ) in place of a 1500W part (SMCJ)? A: Yes, as a design upgrade. The SMLJ series provides higher current handling and power dissipation capability in the same package. This increases transient protection margin but does not degrade circuit performance. Verify that PCB thermal design accommodates the higher power dissipation if the device operates near its maximum rating.

Q: What is the significance of the -E3/TR13 suffix? A: The -E3/TR13 designation indicates Microchip Technology's packaging and lead-free RoHS compliance variant. These parts are functionally equivalent to base part numbers but may have different tape-and-reel configurations or manufacturing date codes. Electrical specifications remain identical.

Q: Are there temperature range differences between substitutes? A: Yes. Most substitutes operate from -55°C to 150°C. SMCJ6.5AE3/TR13 and SMCJ6.5E3/TR13 extend to -65°C. SMLJ6.5A-TP extends to 175°C. Select based on your application's thermal environment. Extended ranges provide design margin but do not affect performance within standard operating conditions.

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