SMCJ54A-TP Equivalent & Substitute Parts

Part Overview

The SMCJ54A-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 54V reverse standoff voltage with 87.1V maximum clamping voltage and 17.3A peak pulse current capability in a DO-214AB (SMC) package. The part is RoHS3 compliant and maintains an active product status with unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching or exceeding the core electrical parameters: reverse standoff voltage (54V), breakdown voltage (60V minimum), clamping voltage (87.1V maximum), and surface-mount DO-214AB packaging. Substitutes may vary in peak pulse current and power dissipation ratings while maintaining functional compatibility within the specified voltage window.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	54	V
Voltage - Breakdown (Min)	60	V
Voltage - Clamping (Max) @ Ipp	87.1	V
Current - Peak Pulse (10/1000µs)	17.3	A
Power - Peak Pulse	1500	W
Type	Zener	—
Unidirectional Channels	1	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the SMCJ54A-TP are classified into two categories based on electrical compatibility:

Direct Equivalents maintain identical voltage parameters (54V standoff, 60V breakdown minimum, 87.1V clamping maximum) with peak pulse current and power ratings within 5% of the original specification. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Substitutes maintain the same voltage window but feature higher peak pulse current and power dissipation ratings. These parts provide enhanced transient protection capability and are suitable for applications requiring greater energy absorption. All substitute parts retain the DO-214AB (SMC) surface-mount package and unidirectional topology.

Critical substitution parameters:

Voltage - Reverse Standoff: 54V (fixed)
Voltage - Breakdown (Min): 60V (fixed)
Voltage - Clamping (Max): 87.1V (fixed)
Package: DO-214AB, SMC (fixed)
Type: Zener, Unidirectional (fixed)

Parameter Comparison

Part Number	Manufacturer	Standoff (V)	Breakdown Min (V)	Clamp Max (V)	Ipp (A)	Power (W)	Temp Range (°C)	RoHS
SMCJ54A-TP	Micro Commercial Co	54	60	87.1	17.3	1500	-55 to 175	ROHS3
SMCJ54A	Meritek	54	60	87.1	17.22	1500	-55 to 150	ROHS3
SMCJ54A-13-F	Diodes Incorporated	54	60	87.1	17.2	1500	-55 to 150	ROHS3
5.0SMDJ54A	Taiwan Semiconductor Corporation	54	60	87.1	57.5	5000	-55 to 175	ROHS3
5.0SMDJ54A-T7	Littelfuse	54	60	87.1	57.5	5000	-65 to 150	ROHS3
SMDJ54A	Alpha & Omega Semiconductor Inc.	54	60	87.1	34.5	3000	-55 to 150	ROHS3
SMDJ54A-T7	Littelfuse Inc.	54	60	87.1	34.4	3000	-65 to 150	ROHS3
SMLJ54A	Bourns Inc.	54	60	87.1	34.4	3000	-55 to 150	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the regulatory requirements of the SMCJ54A-TP. Selection between direct equivalents and similar substitutes depends on application transient energy requirements.

Direct Equivalents (SMCJ54A, SMCJ54A-13-F): Select these parts for direct replacement in existing designs where the 1500W peak pulse power rating is sufficient. The Meritek SMCJ54A offers the closest electrical match with 17.22A peak pulse current. The Diodes Incorporated SMCJ54A-13-F provides equivalent performance with 17.2A peak pulse current. Both maintain the same voltage window and package specifications.

Enhanced Protection Substitutes (5.0SMDJ54A, 5.0SMDJ54A-T7, SMDJ54A, SMDJ54A-T7, SMLJ54A): These parts feature higher peak pulse current ratings (34.4A to 57.5A) and power dissipation (3000W to 5000W), providing increased transient suppression capability. The 5.0SMDJ54A series offers the highest energy absorption at 5000W. The SMDJ54A and SMLJ54A series provide intermediate protection at 3000W. These substitutes are suitable for applications experiencing higher transient stress or requiring design margin enhancement.

Temperature range considerations: The SMCJ54A-TP operates to 175°C junction temperature. Direct equivalents from Meritek and Diodes Incorporated are rated to 150°C. The 5.0SMDJ54A and 5.0SMDJ54A-T7 maintain the 175°C upper limit. For applications requiring full temperature range operation, select parts with matching or higher temperature ratings.

Frequently Asked Questions (FAQ)

Q: Can SMCJ54A from Meritek be used as a direct replacement for SMCJ54A-TP?

A: Yes. Both parts share identical voltage parameters (54V standoff, 60V breakdown, 87.1V clamp), peak pulse current within 1% (17.22A vs 17.3A), and DO-214AB packaging. The primary difference is the maximum operating temperature: Meritek is rated to 150°C versus 175°C for the original part. For applications operating below 150°C junction temperature, this substitution is functionally equivalent.

Q: What is the difference between 1500W and 3000W rated parts?

A: Peak pulse power rating indicates the maximum transient energy the device can absorb during a 10/1000µs pulse. The 1500W parts (SMCJ54A series) are suitable for general-purpose overvoltage protection. The 3000W parts (SMDJ54A, SMLJ54A) and 5000W parts (5.0SMDJ54A) provide enhanced protection for applications with higher transient stress. Selection depends on the expected transient energy in the circuit.

Q: Are all substitute parts in DO-214AB (SMC) package?

A: Yes. All listed substitute parts use the DO-214AB (SMC) surface-mount package, ensuring mechanical and electrical compatibility with the original SMCJ54A-TP footprint. No PCB layout modifications are required.

Q: Do substitute parts maintain RoHS3 compliance?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the regulatory status of the SMCJ54A-TP.

Q: Can higher-rated parts (5.0SMDJ54A, SMDJ54A) be used in place of the original 1500W part?

A: Yes. Higher-rated parts maintain the same voltage window (54V standoff, 87.1V clamp) and are electrically compatible. They provide additional transient energy absorption capability without affecting circuit operation. This substitution is suitable for applications requiring design margin enhancement or experiencing higher transient stress than originally anticipated.

Q: What is the significance of the "-T7" suffix in part numbers?

A: The "-T7" suffix indicates tape and reel packaging format from the manufacturer. This is a packaging designation only and does not affect electrical performance or compatibility. Parts with and without this suffix are electrically identical.

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