SMCJ28CA-TP Equivalent & Substitute Parts

Part Overview

The SMCJ28CA-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. The component is actively produced and RoHS3 compliant, with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter range, enabling design flexibility and supply chain alternatives.

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)	33.1	A
Power - Peak Pulse	1500	W
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature	-55°C ~ 175°C	TJ
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 28V (exact match required)
Voltage - Clamping (Max) @ Ipp: 45.4V (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Mounting Type: Surface Mount (exact match required)
Type: Zener, Bidirectional (exact match required)
Bidirectional Channels: 1 (exact match required)

Substitute parts are classified into two categories:

Direct Substitutes: Parts meeting all electrical parameters and mechanical specifications with current ratings at or above the main part specification (33.1A minimum).

Similar Substitutes: Parts meeting voltage and package specifications but with enhanced current or power ratings, suitable for applications requiring higher transient energy dissipation while maintaining voltage protection characteristics.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status
SMCJ28CA-TP	Micro Commercial Co	28V	45.4V	33.1A	1500W	-55°C ~ 175°C	DO-214AB, SMC	Active
SMCJ28CA	Fairchild Semiconductor	28V	45.4V	33.1A	1500W	-55°C ~ 150°C	DO-214AB, SMC	Active
SMCJ28CA-13-F	Diodes Incorporated	28V	45.4V	33A	1500W	-55°C ~ 150°C	DO-214AB, SMC	Active
5.0SMDJ28CA	MDE Semiconductor Inc	28V	45.4V	110A	5000W	-55°C ~ 150°C	DO-214AB, SMC	Active
5.0SMDJ28CA-T7	Littelfuse Inc.	28V	45.4V	110A	5000W	-65°C ~ 150°C	DO-214AB, SMC	Active
SMDJ28CA	Alpha & Omega Semiconductor Inc.	28V	45.4V	66.1A	3000W	-55°C ~ 150°C	DO-214AB, SMC	Active
SMLJ28CA	Bourns Inc.	28V	45.4V	66A	3000W	-55°C ~ 150°C	DO-214AB, SMC	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and meet RoHS3 compliance requirements. Selection between direct and similar substitutes depends on application transient energy requirements:

Direct Substitutes (SMCJ28CA, SMCJ28CA-13-F): Suitable for applications with transient energy profiles matching the 1500W specification. These parts provide equivalent performance to the SMCJ28CA-TP with minimal design modification.

Similar Substitutes (5.0SMDJ28CA, 5.0SMDJ28CA-T7, SMDJ28CA, SMLJ28CA): Appropriate for applications requiring enhanced transient energy dissipation (3000W to 5000W range). These parts offer higher peak pulse current ratings while maintaining identical voltage protection characteristics. The 5.0SMDJ28CA-T7 extends the lower operating temperature limit to -65°C, suitable for extreme cold-environment applications.

Operating temperature range differences should be evaluated against specific application requirements. The SMCJ28CA-TP supports -55°C to 175°C; substitute parts typically support -55°C to 150°C or -65°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can SMCJ28CA-TP be replaced with SMCJ28CA?

A: Yes. Both parts share identical electrical specifications (28V standoff, 45.4V clamping, 33.1A peak pulse current, 1500W power rating) and DO-214AB SMC packaging. The primary difference is operating temperature range: SMCJ28CA-TP supports -55°C to 175°C, while SMCJ28CA supports -55°C to 150°C. Substitution is valid for applications within the -55°C to 150°C range.

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

A: Direct substitutes (SMCJ28CA, SMCJ28CA-13-F) maintain the 1500W peak pulse power specification. Similar substitutes (5.0SMDJ28CA, 5.0SMDJ28CA-T7, SMDJ28CA, SMLJ28CA) provide higher current ratings (66A to 110A) and power dissipation (3000W to 5000W). Similar substitutes are used when applications experience higher transient energy levels than the original 1500W specification.

Q: Are all substitute parts in the same package?

A: Yes. All listed substitute parts use DO-214AB SMC surface-mount packaging, ensuring mechanical and footprint compatibility with SMCJ28CA-TP designs.

Q: Which substitute part supports the widest temperature range?

A: The 5.0SMDJ28CA-T7 supports -65°C to 150°C, extending the lower temperature limit by 10°C compared to most alternatives. This part is specified for telecom applications and is suitable for extreme cold-environment deployments.

Q: Can I use a higher-power substitute in place of SMCJ28CA-TP?

A: Yes. Higher-power substitutes (SMDJ28CA, SMLJ28CA, 5.0SMDJ28CA, 5.0SMDJ28CA-T7) maintain identical voltage protection characteristics (28V standoff, 45.4V clamping) while providing enhanced transient energy handling. These parts are backward-compatible for applications where the original 1500W specification is adequate, and they provide margin for applications with higher transient stress.

Q: What compliance certifications apply to these parts?

A: All listed parts are RoHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity rating. REACH status varies: SMCJ28CA-TP and most substitutes are REACH Unaffected; SMLJ28CA is REACH Affected. Verify REACH compliance requirements for your specific application and region.

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