SMLJ75A Equivalent & Substitute Parts Reference

Part Overview

The SMLJ75A is a unidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 75V reverse standoff voltage with 121V maximum clamping voltage and 24.8A peak pulse current capability in a DO-214AB (SMC) package. The part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching or exceeding critical electrical parameters: reverse standoff voltage, clamping voltage, peak pulse current, power dissipation capability, and package compatibility. Substitutes are categorized by direct equivalence or functional similarity within acceptable parameter tolerances for the TVS diode category.

Key Parameters

Parameter	SMLJ75A	Unit
Voltage - Reverse Standoff (Typ)	75	V
Voltage - Breakdown (Min)	83.3	V
Voltage - Clamping (Max) @ Ipp	121	V
Current - Peak Pulse (10/1000µs)	24.8	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB (SMC)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ75A are classified into two categories based on electrical parameter alignment:

Direct Equivalents maintain identical or functionally equivalent electrical specifications:

Reverse standoff voltage: 75V
Breakdown voltage (minimum): 83.3V
Clamping voltage (maximum): 121V
Peak pulse current: 24.8A or higher
Power dissipation: 3000W or higher
Package: DO-214AB (SMC)
Mounting: Surface Mount

Similar Substitutes provide comparable overvoltage protection with variations in peak pulse current or power rating, suitable for applications where higher surge capacity or different thermal characteristics are acceptable:

Reverse standoff voltage: 75V
Clamping voltage: 121V
Peak pulse current: 12.4A to 41.4A
Power dissipation: 1500W to 5000W
Package: DO-214AB (SMC)

Limited Substitutes deviate from primary voltage specifications and are listed for reference only:

Reverse standoff voltage: 64.1V to 70.1V
Clamping voltage: 103V to 113V
These parts operate outside the 75V specification window and require circuit-level validation.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage (V)	Breakdown Min (V)	Clamp Voltage (V)	Peak Pulse Current (A)	Power Rating (W)	Package	Status
SMLJ75A	Bourns Inc.	75	83.3	121	24.8	3000	DO-214AB (SMC)	Active
SMDJ75A	Alpha & Omega Semiconductor Inc.	75	83.3	121	24.8	3000	DO-214AB (SMC)	Active
5.0SMDJ75A	Taiwan Semiconductor Corporation	75	83.3	121	41.4	5000	DO-214AB (SMC)	Active
5.0SMDJ75A-T7	Littelfuse Inc.	75	83.3	121	41.4	5000	DO-214AB (SMC)	Active
SMCJ75A	Meritek	75	83.3	121	12.4	1500	DO-214AB (SMC)	Active
SMDJE75A	Eaton - Electronics Division	75	83.3	121	24.8	3000	DO-214AB (SMC)	Active
TPSMC75A	Littelfuse	64.1	71.3	103	14.8	1500	DO-214AB (SMC)	Active
TPSMC82A	Littelfuse Inc.	70.1	77.9	113	14.6	1500	DO-214AB (SMC)	Active

Engineering Selection Recommendations

Direct Equivalents (Preferred for Drop-In Replacement)

SMDJ75A (Alpha & Omega Semiconductor Inc.) and SMDJE75A (Eaton - Electronics Division) are direct electrical equivalents with identical voltage and current specifications. Both maintain 75V standoff, 121V clamping, and 24.8A peak pulse current. SMDJ75A carries ROHS3 compliance with REACH Unaffected status. SMDJE75A is RoHS Compliant with REACH Unaffected status and includes MSL 1 rating. Both are active production parts suitable for immediate substitution without circuit modification.

Higher Capacity Alternatives

5.0SMDJ75A (Taiwan Semiconductor Corporation) and 5.0SMDJ75A-T7 (Littelfuse Inc.) provide enhanced surge protection with 41.4A peak pulse current and 5000W power rating, maintaining identical voltage specifications. These parts accommodate higher transient energy and are suitable for applications requiring increased margin. 5.0SMDJ75A-T7 includes automotive-grade qualification (AEC-Q101) and extended temperature range (-65°C to 150°C). Both are ROHS3 compliant and active production parts.

Lower Capacity Alternative

SMCJ75A (Meritek) operates at 12.4A peak pulse current and 1500W power rating while maintaining 75V standoff and 121V clamping specifications. This part is suitable for lower-energy transient environments and offers cost optimization. ROHS3 compliant with unlimited MSL rating and active production status.

Limited Substitutes (Voltage Deviation)

TPSMC75A and TPSMC82A deviate from the 75V standoff specification with 64.1V and 70.1V ratings respectively. These automotive-grade parts (AEC-Q101) operate outside the primary voltage window and require circuit-level analysis to confirm compatibility. Use only when voltage tolerance permits.

Frequently Asked Questions (FAQ)

Q: Can SMDJ75A directly replace SMLJ75A?

A: Yes. SMDJ75A is a direct electrical equivalent with identical reverse standoff voltage (75V), clamping voltage (121V), and peak pulse current (24.8A). Both use DO-214AB (SMC) packaging and surface-mount configuration. No circuit modification is required.

Q: What is the difference between SMLJ75A and 5.0SMDJ75A?

A: Both maintain 75V standoff and 121V clamping voltage. The 5.0SMDJ75A provides higher surge capacity with 41.4A peak pulse current and 5000W power rating compared to SMLJ75A's 24.8A and 3000W. The 5.0SMDJ75A is suitable for applications requiring greater transient energy absorption.

Q: Can SMCJ75A be used as a substitute?

A: SMCJ75A maintains voltage specifications (75V standoff, 121V clamping) but operates at reduced peak pulse current (12.4A) and power rating (1500W). Substitution is valid only if the application's transient current does not exceed 12.4A. Circuit analysis is required to confirm adequacy.

Q: Are TPSMC75A and TPSMC82A suitable replacements?

A: TPSMC75A and TPSMC82A deviate from the 75V standoff specification with 64.1V and 70.1V ratings respectively. These parts operate outside the primary voltage window and require circuit-level validation. Use only when voltage tolerance analysis confirms compatibility.

Q: What packaging considerations apply to these substitutes?

A: All listed substitutes use DO-214AB (SMC) surface-mount packaging, maintaining mechanical and thermal compatibility with SMLJ75A. No PCB layout or assembly process modifications are required for direct package equivalents.

Q: Which substitute offers the best compliance profile?

A: SMDJ75A, 5.0SMDJ75A, 5.0SMDJ75A-T7, and SMCJ75A all maintain ROHS3 compliance. 5.0SMDJ75A-T7 includes automotive-grade qualification (AEC-Q101) and extended temperature range (-65°C to 150°C), suitable for automotive and harsh-environment applications.

Q: Can I use a higher-rated part like 5.0SMDJ75A in place of SMLJ75A?

A: Yes. Higher peak pulse current (41.4A) and power rating (5000W) provide additional margin without compromising circuit protection. The identical voltage specifications ensure proper threshold operation. This substitution improves reliability in high-transient environments.

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