SMCJ75 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMCJ75 is a unidirectional Zener transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 75V reverse standoff voltage with a maximum clamping voltage of 127.05V at peak pulse current of 12.4A, housed in a DO-214AB (SMC) package. The original SMCJ75 from Littelfuse is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers including Meritek, Diodes Incorporated, Microchip Technology, Bourns Inc., Micro Commercial Co, and Comchip Technology, all maintaining active product status and full compliance with RoHS3 and REACH regulations.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	75	V
Voltage - Breakdown (Min)	78.93	V
Voltage - Clamping (Max) @ Ipp	127.05	V
Current - Peak Pulse (10/1000µs)	12.4	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMCJ75 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Voltage - Reverse Standoff: 75V (exact match required)
Voltage - Breakdown (Min): 78.93V to 83.3V (acceptable range)
Voltage - Clamping (Max) @ Ipp: 121V to 134V (acceptable range for general-purpose protection)
Current - Peak Pulse (10/1000µs): 12.4A minimum (higher values acceptable for enhanced protection)
Power - Peak Pulse: 1500W minimum (higher values acceptable)
Mounting Type: Surface Mount (required)
Package / Case: DO-214AB, SMC (required)
Type: Zener (required)
Unidirectional Channels: 1 (required)
Operating Temperature: -55°C to 150°C minimum range (extended ranges acceptable)
RoHS Status: ROHS3 Compliant (required)
Moisture Sensitivity Level: 1 (Unlimited) (required)

Substitute parts are grouped into two categories based on peak pulse current rating: standard current devices (12.4A) and enhanced current devices (24.8A to 24.79A). Both categories maintain identical voltage specifications and package requirements, with enhanced current devices providing higher power dissipation capability (3000W vs 1500W).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Product Status
SMCJ75	Littelfuse Inc.	75	78.93	127.05	12.4	1500	-55 to 150	DO-214AB, SMC	Obsolete
SMCJ75A	Meritek	75	83.3	121	12.4	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ75A-13-F	Diodes Incorporated	75	83.3	121	12.4	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ75AE3/TR13	Microchip Technology	75	83.3	121	12.4	1500	-65 to 150	DO-214AB, SMC	Active
SMCJ75E3/TR13	Microchip Technology	75	83.3	134	11.2	1500	-65 to 150	DO-214AB, SMC	Active
SMLJ75A	Bourns Inc.	75	83.3	121	24.8	3000	-55 to 150	DO-214AB, SMC	Active
SMLJ75A-TP	Micro Commercial Co	75	83.3	121	24.8	3000	-55 to 175	DO-214AB, SMC	Active
SMLJ75AE3/TR13	Microchip Technology	75	83.3	121	24.8	300	-55 to 150	DO-214AB, SMC	Active
TV30C750J-G	Comchip Technology	75	83.3	121	24.79	3000	-55 to 150	DO-214AB, SMC	Active

Engineering Selection Recommendations

All substitute parts listed maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) classification, ensuring compatibility with standard manufacturing and storage protocols.

Standard Current Devices (12.4A Peak Pulse): SMCJ75A (Meritek), SMCJ75A-13-F (Diodes Incorporated), and SMCJ75AE3/TR13 (Microchip Technology) provide direct electrical equivalence to the original SMCJ75. These devices are recommended for applications requiring exact current specifications. SMCJ75AE3/TR13 offers extended operating temperature range (-65°C to 150°C) compared to the original specification.

Enhanced Current Devices (24.8A Peak Pulse): SMLJ75A (Bourns Inc.), SMLJ75A-TP (Micro Commercial Co), SMLJ75AE3/TR13 (Microchip Technology), and TV30C750J-G (Comchip Technology) provide doubled peak pulse current and tripled power dissipation (3000W vs 1500W). These devices are suitable for applications requiring enhanced transient protection capability while maintaining identical voltage specifications and package form factor. SMLJ75A-TP supports extended operating temperature to 175°C.

All substitute parts are available in active production status with established supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can SMLJ75A series devices replace SMCJ75 in existing designs? A: Yes. SMLJ75A devices maintain identical voltage specifications (75V reverse standoff, 121V clamping) and package form factor (DO-214AB, SMC). The higher peak pulse current (24.8A vs 12.4A) and power rating (3000W vs 1500W) provide enhanced protection without affecting circuit compatibility. No design modifications are required.

Q: What is the difference between SMCJ75AE3/TR13 and SMCJ75A-13-F? A: Both devices share identical electrical specifications (75V standoff, 121V clamping, 12.4A peak pulse). SMCJ75AE3/TR13 is manufactured by Microchip Technology with extended operating temperature range (-65°C to 150°C) and Tape & Reel packaging. SMCJ75A-13-F is manufactured by Diodes Incorporated with standard operating range (-55°C to 150°C) and Cut Tape & Digi-Reel packaging. Selection depends on temperature requirements and packaging preference.

Q: Why does SMCJ75E3/TR13 show 11.2A peak pulse instead of 12.4A? A: SMCJ75E3/TR13 maintains the same 75V reverse standoff and 1500W power rating as the original SMCJ75, but achieves a higher clamping voltage of 134V at slightly reduced peak pulse current of 11.2A. This variant is suitable for applications requiring higher voltage clamping while maintaining equivalent power dissipation.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), meeting current environmental and manufacturing standards.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR) for automated assembly, Cut Tape (CT) & Digi-Reel for semi-automated processes, and Bulk packaging for manual assembly. Selection depends on production volume and assembly equipment compatibility.

Q: Can SMLJ75AE3/TR13 be used as a direct replacement despite the 300W power rating discrepancy? A: SMLJ75AE3/TR13 maintains identical voltage and current specifications to other SMLJ75A variants but shows 300W peak pulse power in the provided data. This device is electrically compatible for voltage protection applications. Verification of power dissipation requirements in the specific application is recommended before selection.

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