SMLJ15A-TP Equivalent & Substitute Parts

Part Overview

The SMLJ15A-TP is a unidirectional transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 15V reverse standoff voltage with a 24.4V maximum clamping voltage and 123A peak pulse current capability in a DO-214AB (SMC) package. The part is active in production status and ROHS3 compliant with unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching electrical specifications: 15V reverse standoff voltage, 16.7V minimum breakdown voltage, 24.4V maximum clamping voltage at peak pulse current, and 3000W peak pulse power rating. Substitutes must maintain the same unidirectional channel configuration and surface-mount package compatibility.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	15V
Voltage - Breakdown (Min)	16.7V
Voltage - Clamping (Max) @ Ipp	24.4V
Current - Peak Pulse (10/1000µs)	123A
Power - Peak Pulse	3000W
Type	Zener
Unidirectional Channels	1
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 175°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

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

Direct Substitutes maintain all critical electrical parameters: 15V reverse standoff voltage, 16.7V minimum breakdown voltage, 24.4V maximum clamping voltage, and 123A peak pulse current with 3000W peak pulse power. These parts are pin-compatible and functionally equivalent for the specified application.

Similar Substitutes share the same voltage specifications (15V standoff, 16.7V breakdown, 24.4V clamping) but differ in peak pulse current capability (205A or 61.5A) and corresponding power dissipation. These parts provide alternative performance characteristics and must be evaluated for application-specific requirements.

The substitution logic is based strictly on the following parameters:

Voltage - Reverse Standoff: 15V
Voltage - Breakdown (Min): 16.7V
Voltage - Clamping (Max) @ Ipp: 24.4V
Unidirectional Channels: 1
Package / Case: DO-214AB or compatible SMC variant
Type: Zener

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Package	Product Status
SMLJ15A-TP	Micro Commercial Co	15V	16.7V	24.4V	123A	3000W	-55°C ~ 175°C	DO-214AB, SMC	Active
3SMC15A TR13 PBFREE	Central Semiconductor Corp	15V	16.7V	24.4V	123A	3000W	-65°C ~ 150°C	DO-214AB, SMC	Active
SM30T18AY	STMicroelectronics	15V	16.7V	24.4V	123A	3000W	-55°C ~ 175°C	DO-214AB, SMC	Active
SMC30J15A	STMicroelectronics	15V	16.7V	24.4V	123A	3000W	-55°C ~ 175°C	DO-214AB, SMC	Active
SMDJ15A	Alpha & Omega Semiconductor Inc.	15V	16.7V	24.4V	123A	3000W	-55°C ~ 150°C	DO-214AB, SMC	Active
TPSMD15A	Littelfuse Inc.	15V	16.7V	24.4V	123A	3000W	-65°C ~ 150°C	DO-214AB, SMC	Active
5.0SMDJ15A	MDE Semiconductor Inc	15V	16.7V	24.4V	205A	5000W	-55°C ~ 150°C	DO-214AB, SMC	Active
5.0SMDJ15A-T7	Littelfuse Inc.	15V	16.7V	24.4V	205A	5000W	-65°C ~ 150°C	DO-214AB, SMC	Active
SMCJ15A	EVVO Semi	15V	16.7V	24.4V	61.5A	600W	-65°C ~ 150°C	DO-214AC, SMA	Active

Engineering Selection Recommendations

Direct Substitutes (Electrical and Thermal Equivalents):

The parts 3SMC15A TR13 PBFREE, SM30T18AY, SMC30J15A, SMDJ15A, and TPSMD15A are direct electrical equivalents with identical voltage and current specifications. All are active production parts with ROHS3 compliance and unlimited moisture sensitivity rating.

SM30T18AY and TPSMD15A carry AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components. SM30T18AY and SMC30J15A are manufactured by STMicroelectronics with the same operating temperature range as the primary part (-55°C ~ 175°C). SMLJ15A-TP and SM30T18AY provide the widest upper temperature rating at 175°C.

Similar Substitutes (Higher Current/Power Rating):

The 5.0SMDJ15A series (from MDE Semiconductor Inc and Littelfuse Inc.) provides enhanced current handling at 205A peak pulse with 5000W peak pulse power, maintaining identical voltage specifications. These parts are suitable for applications requiring higher transient energy absorption. The 5.0SMDJ15A-T7 from Littelfuse carries AEC-Q101 qualification and operates to -65°C minimum.

Package Consideration:

SMCJ15A from EVVO Semi uses DO-214AC (SMA) package with reduced current rating (61.5A) and power dissipation (600W). This part is not recommended as a direct substitute due to package incompatibility and lower performance specifications.

Frequently Asked Questions (FAQ)

Q: Can I use 3SMC15A TR13 PBFREE as a direct replacement for SMLJ15A-TP?

A: Yes. Both parts share identical electrical specifications: 15V reverse standoff, 16.7V breakdown, 24.4V clamping voltage, and 123A peak pulse current with 3000W power dissipation. Both are ROHS3 compliant with unlimited moisture sensitivity. The operating temperature range differs slightly (-65°C to 150°C for 3SMC15A versus -55°C to 175°C for SMLJ15A-TP), which may be relevant for extreme temperature applications.

Q: What is the difference between direct substitutes and similar substitutes?

A: Direct substitutes (3SMC15A TR13 PBFREE, SM30T18AY, SMC30J15A, SMDJ15A, TPSMD15A) maintain all electrical parameters including 123A peak pulse current and 3000W power rating. Similar substitutes (5.0SMDJ15A series) provide higher current capability (205A) and power dissipation (5000W) while maintaining the same voltage specifications. Similar substitutes are suitable only if the application can accommodate the enhanced performance characteristics.

Q: Are all substitute parts available in the same package?

A: Most direct substitutes use DO-214AB or compatible SMC packages. SMCJ15A from EVVO Semi uses DO-214AC (SMA) package, which is physically different and not recommended for direct substitution. Verify package compatibility with your PCB layout before selection.

Q: Which substitute parts have automotive qualification?

A: SM30T18AY and TPSMD15A carry AEC-Q101 automotive qualification. The 5.0SMDJ15A-T7 also carries AEC-Q101 qualification. These parts are suitable for automotive and industrial applications requiring qualified component status.

Q: Can I use SMCJ15A from EVVO Semi as a substitute?

A: SMCJ15A is not recommended as a direct substitute. While it maintains the same voltage specifications (15V standoff, 16.7V breakdown, 24.4V clamping), it uses a different package (DO-214AC/SMA versus DO-214AB/SMC), has significantly lower current rating (61.5A versus 123A), and reduced power dissipation (600W versus 3000W). Package incompatibility and performance reduction make this part unsuitable for applications designed for SMLJ15A-TP.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by: reverse standoff voltage (15V), minimum breakdown voltage (16.7V), maximum clamping voltage (24.4V), unidirectional channel configuration (1 channel), and package type (DO-214AB/SMC). Peak pulse current and power dissipation determine whether a part is a direct or similar substitute. Operating temperature range and compliance certifications (ROHS3, AEC-Q101) are secondary selection criteria based on application requirements.

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