SMCJ14 Equivalent & Substitute Parts

Part Overview

The SMCJ14 is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. This unidirectional Zener diode operates with a 14V reverse standoff voltage and provides clamping at 24.36V maximum, dissipating peak pulse power of 1500W in a DO-214AB (SMC) package. The SMCJ14 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMCJ14
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	14V
Voltage - Clamping (Max) @ Ipp	24.36V
Current - Peak Pulse (10/1000µs)	64.7A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Operating Temperature	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SMCJ14 is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - Reverse Standoff (Typ): 14V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener, Unidirectional

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 23.2V to 25.8V (within acceptable overvoltage protection range)
Current - Peak Pulse (10/1000µs): 58.1A to 129.4A (higher current ratings provide enhanced protection margin)
Power - Peak Pulse: 1500W to 3000W (higher power dissipation capability acceptable)
Operating Temperature: -55°C to -65°C minimum; 150°C to 175°C maximum (extended ranges acceptable)

Substitute parts are grouped by clamping voltage and peak pulse current characteristics, as these directly affect circuit protection performance while maintaining electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	RoHS Status
SMCJ14	Littelfuse Inc.	14V	24.36V	64.7A	1500W	-55°C ~ 150°C	Obsolete	ROHS3 Compliant
SMCJ14A	Meritek	14V	23.2V	64.66A	1500W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMCJ14AE3/TR13	Microchip Technology	14V	23.2V	64.7A	1500W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMCJ14E3/TR13	Microchip Technology	14V	25.8V	58.1A	1500W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMLJ14A	Bourns Inc.	14V	23.2V	129.4A	3000W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMLJ14A-TP	Micro Commercial Co	14V	23.2V	129.4A	3000W	-55°C ~ 175°C	Active	Not Specified
TV15C140J-G	Comchip Technology	14V	25.8V	58.14A	1500W	-55°C ~ 150°C	Active	ROHS3 Compliant
TV30C140J-G	Comchip Technology	14V	23.2V	129.31A	3000W	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Electrical Equivalents (1500W Power Rating): SMCJ14A (Meritek), SMCJ14AE3/TR13 (Microchip Technology), and TV15C140J-G (Comchip Technology) provide direct electrical substitution with matching 1500W peak pulse power dissipation. SMCJ14AE3/TR13 offers extended low-temperature operation to -65°C. All three maintain ROHS3 compliance and active product status.

Enhanced Protection Alternatives (3000W Power Rating): SMLJ14A (Bourns Inc.), SMLJ14A-TP (Micro Commercial Co), and TV30C140J-G (Comchip Technology) provide doubled peak pulse power dissipation at 3000W, enabling higher transient current handling (129.4A and 129.31A respectively). These are suitable for applications requiring increased protection margin. SMLJ14A-TP extends operating temperature to 175°C.

Selection Criteria:

For direct replacement in existing designs: SMCJ14A or SMCJ14AE3/TR13
For enhanced protection in high-stress environments: SMLJ14A or TV30C140J-G
For extended temperature range: SMCJ14AE3/TR13 (-65°C minimum) or SMLJ14A-TP (175°C maximum)
All substitute parts maintain DO-214AB (SMC) package compatibility and surface mount configuration

Frequently Asked Questions (FAQ)

Q: Can SMLJ14A replace SMCJ14 directly? A: Yes, electrically. SMLJ14A maintains the 14V reverse standoff voltage and DO-214AB package. However, it provides 3000W peak pulse power versus the original 1500W, and 129.4A peak pulse current versus 64.7A. This enhanced capability is compatible with SMCJ14 circuit applications and does not create incompatibility.

Q: What is the difference between SMCJ14AE3/TR13 and SMCJ14E3/TR13? A: Both are Microchip Technology products with identical operating temperature range (-65°C ~ 150°C). SMCJ14AE3/TR13 clamps at 23.2V with 64.7A peak pulse current. SMCJ14E3/TR13 clamps at 25.8V with 58.1A peak pulse current. Selection depends on whether lower clamping voltage or higher current handling is required.

Q: Are all substitute parts ROHS3 compliant? A: SMCJ14A, SMCJ14AE3/TR13, SMCJ14E3/TR13, SMLJ14A, TV15C140J-G, and TV30C140J-G are ROHS3 compliant. SMLJ14A-TP compliance status is not specified in available documentation.

Q: Does package designation affect substitution? A: No. All substitute parts use DO-214AB (SMC) surface mount package, identical to the original SMCJ14. Tape & Reel (TR) and Bulk packaging designations refer to supply format only and do not affect electrical or mechanical compatibility.

Q: Can I use TV15C140J-G or TV30C140J-G as substitutes? A: Yes. Both Comchip Technology parts maintain 14V reverse standoff voltage and DO-214AB package. TV15C140J-G matches the original 1500W power rating with 25.8V clamping. TV30C140J-G provides 3000W power with 23.2V clamping and higher current capacity.

Q: What is the impact of different clamping voltages? A: Clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit. SMCJ14 clamps at 24.36V. Substitutes range from 23.2V to 25.8V. Lower clamping voltage (23.2V) provides tighter protection; higher clamping voltage (25.8V) allows slightly higher transient peaks. Selection depends on circuit tolerance specifications.

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