SMCJ7.5 Equivalent & Substitute Parts

Part Overview

The SMCJ7.5 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 7.5V reverse standoff voltage with a 14.65V maximum clamping voltage and 116.3A peak pulse current capability in a DO-214AB (SMC) package. The main part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing circuit protection requirements and design continuity.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	7.5	V
Breakdown Voltage (Min)	7.89	V
Clamping Voltage (Max) @ Ipp	14.65	V
Peak Pulse Current (10/1000µs)	116.3	A
Peak Pulse Power	1500	W
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution for the SMCJ7.5 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 7.5V (exact match required)
Package / Case: DO-214AB or SMC (mechanical compatibility)
Clamping voltage range: 12.9V to 14.3V (acceptable variation within protection requirements)
Peak pulse current: 104.9A to 232.6A (higher values provide enhanced protection margin)
Peak pulse power: 1500W to 3000W (higher ratings acceptable for same voltage class)
Operating temperature: -55°C to 150°C minimum (extended ranges acceptable)
RoHS3 compliance and MSL 1 rating (environmental and handling requirements)

Grouping Logic:

Group A – Direct Electrical Equivalents (1500W class, 12.9V clamping): Parts with identical reverse standoff voltage (7.5V), clamping voltage of 12.9V, and 1500W peak pulse power. These provide direct functional replacement with minimal circuit impact.

Group B – Enhanced Performance Substitutes (3000W class, 12.9V clamping): Parts with 7.5V reverse standoff voltage, 12.9V clamping voltage, but 3000W peak pulse power. These offer superior transient energy handling while maintaining the same voltage protection characteristics.

Group C – Voltage Variant (7.5V standoff, 14.3V clamping): Parts with 7.5V reverse standoff but higher clamping voltage (14.3V). These are suitable only when circuit design permits slightly higher clamping levels.

Group D – Voltage Class Variant (8.5V standoff): Parts with 8.5V reverse standoff voltage. These are not direct substitutes and require circuit re-evaluation.

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Operating Temp (°C)	Product Status
SMCJ7.5	Littelfuse Inc.	7.5	7.89	14.65	116.3	1500	DO-214AB (SMCJ)	-55 to 150	Obsolete
SMCJ7.5A	Taiwan Semiconductor Corporation	7.5	8.33	12.9	122	1500	DO-214AB (SMC)	-55 to 150	Active
SMCJ7.5A-13-F	Diodes Incorporated	7.5	8.33	12.9	116.3	1500	DO-214AB (SMC)	-55 to 150	Active
SMCJ7.5AE3/TR13	Microchip Technology	7.5	8.33	12.9	116.3	1500	DO-214AB (SMCJ)	-65 to 150	Active
SMCJ7.5E3/TR13	Microchip Technology	7.5	8.33	14.3	104.9	1500	DO-214AB (SMCJ)	-65 to 150	Active
SMCJ7V5A	Fairchild Semiconductor	7.5	8.33	12.9	116.3	1500	DO-214AB (SMC)	Not specified	Active
SMCJ8.5A-13-F	Diodes Incorporated	8.5	9.44	14.4	104.2	1500	DO-214AB (SMC)	-55 to 150	Active
SMLJ7.5A	Bourns Inc.	7.5	8.33	12.9	232.6	3000	DO-214AB (SMC)	-55 to 150	Active
SMLJ7.5A-TP	Micro Commercial Co	7.5	8.33	12.9	232.6	3000	DO-214AB (SMC)	-55 to 175	Active
SMLJ7.5AE3/TR13	Microchip Technology	7.5	8.33	12.9	232.6	3000	DO-214AB	-55 to 150	Active

Engineering Selection Recommendations

For Direct Replacement (Group A – 1500W, 12.9V Clamping):

SMCJ7.5A-13-F (Diodes Incorporated) is the primary recommended substitute. This part maintains identical electrical specifications to the original SMCJ7.5 with 116.3A peak pulse current and 1500W peak pulse power. It is active in production, ROHS3 compliant, and available in standard tape and reel packaging. The DO-214AB (SMC) package ensures mechanical compatibility with existing PCB layouts.

SMCJ7.5AE3/TR13 (Microchip Technology) is an alternative direct equivalent with extended operating temperature range (-65°C to 150°C) compared to the original specification (-55°C to 150°C). This part is suitable for applications requiring enhanced low-temperature performance and is available in tape and reel packaging.

SMCJ7.5A (Taiwan Semiconductor Corporation) provides functional equivalence with slightly higher peak pulse current (122A) and is available in high inventory quantities. This part is active and ROHS3 compliant.

For Enhanced Protection (Group B – 3000W, 12.9V Clamping):

SMLJ7.5A (Bourns Inc.) and SMLJ7.5AE3/TR13 (Microchip Technology) offer doubled peak pulse power (3000W) while maintaining the same 7.5V reverse standoff and 12.9V clamping voltage. These parts are suitable for applications requiring higher transient energy absorption. SMLJ7.5A-TP (Micro Commercial Co) extends the operating temperature to 175°C and is available in bulk packaging.

For Voltage Variant Applications (Group C – 14.3V Clamping):

SMCJ7.5E3/TR13 (Microchip Technology) features a higher clamping voltage of 14.3V while maintaining 7.5V reverse standoff. This part is suitable only when circuit design specifications permit higher clamping levels and is available with extended temperature range (-65°C to 150°C).

Not Recommended for Direct Substitution:

SMCJ8.5A-13-F (Diodes Incorporated) has a different reverse standoff voltage (8.5V) and is not a direct substitute. This part requires circuit re-evaluation and is suitable only for applications designed for 8.5V protection levels.

Frequently Asked Questions (FAQ)

Q: Can SMCJ7.5A-13-F directly replace the obsolete SMCJ7.5?

A: Yes. SMCJ7.5A-13-F maintains identical reverse standoff voltage (7.5V), clamping voltage (12.9V), peak pulse current (116.3A), and peak pulse power (1500W). The DO-214AB (SMC) package is mechanically compatible with existing PCB designs. No circuit modifications are required.

Q: What is the difference between SMCJ7.5A and SMCJ7.5AE3/TR13?

A: Both parts have identical electrical specifications (7.5V standoff, 12.9V clamping, 1500W power). SMCJ7.5AE3/TR13 extends the operating temperature range to -65°C (compared to -55°C for SMCJ7.5A), making it suitable for applications requiring enhanced low-temperature performance.

Q: Why would I choose SMLJ7.5A over SMCJ7.5A-13-F?

A: SMLJ7.5A provides doubled peak pulse power (3000W versus 1500W) while maintaining the same 7.5V reverse standoff and 12.9V clamping voltage. This higher power rating provides greater transient energy absorption capability and is suitable for applications with more severe overvoltage events or higher repetition rates.

Q: Is SMCJ8.5A-13-F compatible with SMCJ7.5 designs?

A: No. SMCJ8.5A-13-F has a different reverse standoff voltage (8.5V) and higher clamping voltage (14.4V). This part is not a direct substitute and requires circuit re-evaluation to confirm compatibility with the protected circuit's voltage specifications.

Q: What packaging options are available for SMCJ7.5 substitutes?

A: Most substitutes are available in tape and reel (TR) packaging for automated assembly. SMCJ7V5A (Fairchild Semiconductor) and SMLJ7.5A-TP (Micro Commercial Co) are available in bulk packaging. All parts use the DO-214AB (SMC) package for surface-mount compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the environmental and handling requirements of the original SMCJ7.5.

Q: Can I use SMCJ7.5E3/TR13 as a direct replacement?

A: SMCJ7.5E3/TR13 maintains the 7.5V reverse standoff voltage but has a higher clamping voltage (14.3V versus 14.65V). This part is suitable only when circuit design specifications permit the higher clamping level. Verify circuit protection requirements before substitution.

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