SMLJ28CA-TP Equivalent & Substitute Parts

Part Overview

The SMLJ28CA-TP is a transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with a 28V reverse standoff voltage and provides 45.4V clamping at peak pulse current, delivering 3000W peak pulse power dissipation in a DO-214AB (SMC) package. The part is active in production and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical performance parameters and package compatibility to support design flexibility, inventory optimization, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28	V
Voltage - Breakdown (Min)	31.1	V
Voltage - Clamping (Max) @ Ipp	45.4	V
Current - Peak Pulse (10/1000µs)	66	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-214AB, SMC	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMLJ28CA-TP are grouped into two categories based on electrical and mechanical compatibility:

Direct Substitutes maintain identical electrical specifications: 28V reverse standoff voltage, 31.1V minimum breakdown voltage, 45.4V maximum clamping voltage, and 3000W peak pulse power. These parts are pin-compatible and functionally interchangeable in the same circuit application without design modification.

Similar Substitutes share the core voltage specifications (28V standoff, 31.1V breakdown, 45.4V clamping) but differ in peak pulse current rating or power dissipation capability. These parts are suitable for applications where higher current handling or power capacity is acceptable or beneficial, provided the circuit design accommodates the different electrical characteristics.

Key substitution parameters:

Voltage - Reverse Standoff: 28V (fixed)
Voltage - Breakdown (Min): 31.1V (fixed)
Voltage - Clamping (Max) @ Ipp: 45.4V (fixed)
Package / Case: DO-214AB, SMC (fixed)
Type: Zener, Bidirectional (fixed)
Current - Peak Pulse: 66A to 110A (variable)
Power - Peak Pulse: 3000W to 5000W (variable)

Parameter Comparison

Manufacturer 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 Temperature (°C)	Package	Substitution Type
SMLJ28CA-TP	Micro Commercial Co	28	31.1	45.4	66	3000	-55 to 175	DO-214AB, SMC	Main Part
3SMC28CA TR13 PBFREE	Central Semiconductor Corp	28	31.1	45.4	66	3000	-65 to 150	DO-214AB, SMC	Direct Substitute
SMC30J28CA	STMicroelectronics	28	31.1	45.4	66	3000	-55 to 175	DO-214AB, SMC	Direct Substitute
SMDJ28CA	Alpha & Omega Semiconductor Inc.	28	31.1	45.4	66.1	3000	-55 to 150	DO-214AB, SMC	Direct Substitute
5.0SMDJ28CA	MDE Semiconductor Inc	28	31.1	45.4	110	5000	-55 to 150	DO-214AB, SMC	Similar Substitute
5.0SMDJ28CA-T7	Littelfuse Inc.	28	31.1	45.4	110	5000	-65 to 150	DO-214AB, SMC	Similar Substitute
SMC3K28CAHM3/57	Vishay General Semiconductor - Diodes Division	28	31.1	45.4	66.1	3000	-55 to 150	DO-214AB, SMC	Direct Substitute
SMCJ28CA	Fairchild Semiconductor	28	31.1	45.4	33.1	1500	-55 to 150	DO-214AB, SMC	Similar Substitute
SMLJ28CA	Bourns Inc.	28	31.1	45.4	66	3000	-55 to 150	DO-214AB, SMC	Direct Substitute

Engineering Selection Recommendations

Direct Substitutes (Recommended for Pin-Compatible Replacement):

The parts 3SMC28CA TR13 PBFREE, SMC30J28CA, SMDJ28CA, SMC3K28CAHM3/57, and SMLJ28CA provide electrical and mechanical equivalence to the SMLJ28CA-TP. All maintain 28V standoff voltage, 31.1V breakdown voltage, 45.4V clamping voltage, and 3000W peak pulse power. These parts are suitable for direct substitution in existing designs without circuit modification.

SMC3K28CAHM3/57 (Vishay) carries AEC-Q101 automotive qualification and is designated as a TransZorb® product, making it appropriate for automotive-grade applications requiring formal qualification documentation.

Similar Substitutes (Application-Dependent Selection):

The 5.0SMDJ28CA (MDE Semiconductor) and 5.0SMDJ28CA-T7 (Littelfuse) offer higher peak pulse current (110A) and power dissipation (5000W) while maintaining identical voltage specifications. These parts are suitable for applications requiring enhanced transient energy absorption capacity. The 5.0SMDJ28CA-T7 includes extended temperature range (-65°C to 150°C) and is applicable to telecom applications.

The SMCJ28CA (Fairchild Semiconductor) provides reduced peak pulse current (33.1A) and power dissipation (1500W). This part is suitable only for applications with lower transient energy requirements and should not be used as a direct replacement for the SMLJ28CA-TP in circuits designed for 66A peak pulse current.

Compliance Considerations:

All listed parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. The SMLJ28CA-TP and SMC30J28CA support the full operating temperature range of -55°C to 175°C, while most substitute parts are rated to -55°C to 150°C or -65°C to 150°C. Temperature range selection should align with application requirements.

Frequently Asked Questions (FAQ)

Q: Can SMCJ28CA be used as a direct replacement for SMLJ28CA-TP?

A: SMCJ28CA shares the same voltage specifications (28V standoff, 31.1V breakdown, 45.4V clamping) and package (DO-214AB, SMC), but has significantly lower peak pulse current (33.1A vs. 66A) and power dissipation (1500W vs. 3000W). It is not suitable as a direct replacement in circuits designed for the full 66A peak pulse rating. Use only if the application requires lower transient current handling.

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

A: Direct substitutes maintain identical peak pulse current (66A) and power dissipation (3000W) ratings, ensuring functional equivalence without design modification. Similar substitutes differ in current or power ratings while maintaining the same voltage specifications. The 5.0SMDJ28CA series offers higher ratings (110A, 5000W), while SMCJ28CA offers lower ratings (33.1A, 1500W).

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

A: Yes, all listed substitute parts use the DO-214AB (SMC) surface-mount package, ensuring mechanical compatibility and identical PCB footprint. Packaging format (Tape & Reel vs. bulk) may vary by manufacturer and supplier.

Q: Does operating temperature range affect substitution suitability?

A: The SMLJ28CA-TP operates from -55°C to 175°C. Most substitute parts are rated to -55°C to 150°C or -65°C to 150°C. If the application requires operation above 150°C, only the SMLJ28CA-TP and SMC30J28CA are suitable. For applications within -55°C to 150°C, all listed parts are compatible.

Q: Is SMC3K28CAHM3/57 suitable for automotive applications?

A: Yes, SMC3K28CAHM3/57 carries AEC-Q101 automotive qualification and is designated as a TransZorb® product by Vishay. It is appropriate for automotive-grade circuit protection applications requiring formal qualification documentation.

Q: Can I use 5.0SMDJ28CA-T7 in place of SMLJ28CA-TP?

A: Yes, 5.0SMDJ28CA-T7 maintains identical voltage specifications and package compatibility. The higher peak pulse current (110A) and power dissipation (5000W) provide enhanced transient protection capability. This substitution is suitable for applications where increased energy absorption is acceptable or beneficial. The part is qualified for telecom applications and supports extended temperature range (-65°C to 150°C).

Q: What compliance certifications apply to all substitute parts?

A: All listed parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no moisture-related handling restrictions. REACH status varies by manufacturer; verify specific REACH compliance requirements for your supply chain.

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