SMCJ51A-TP Equivalent & Substitute Parts

Part Overview

The SMCJ51A-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 51V reverse standoff voltage with an 82.4V maximum clamping voltage and 18.2A peak pulse current capability in a DO-214AB (SMC) package. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching electrical characteristics (voltage ratings, clamping specifications, and peak pulse current) and mechanical compatibility (DO-214AB package, surface-mount configuration). Substitutes may vary in peak power dissipation and manufacturer specifications while maintaining core protection functionality.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	51	V
Voltage - Breakdown (Min)	56.7	V
Voltage - Clamping (Max) @ Ipp	82.4	V
Current - Peak Pulse (10/1000µs)	18.2	A
Power - Peak Pulse	1500	W
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature	-55 to 175	°C
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical compatibility with the SMCJ51A-TP:

Direct Equivalents maintain identical voltage ratings (51V standoff, 56.7V breakdown minimum, 82.4V clamping maximum) and unidirectional channel configuration. These parts are interchangeable in applications where the 1500W peak pulse power specification is sufficient. Direct equivalents include parts from Central Semiconductor Corp (1SMC51A TR13 PBFREE), MDD (SMCJ51A), Diodes Incorporated (SMCJ51A-13-F), and Vishay General Semiconductor (SMCJ51A-E3/57T).

Similar Substitutes maintain the same voltage protection characteristics and DO-214AB package but differ in peak pulse current and power dissipation ratings. These parts include higher-power variants (5.0SMDJ51A at 5000W, SMDJ51A and SMDJ51A-T7 at 3000W, SMLJ51A at 3000W) suitable for applications requiring greater transient energy absorption. Selection between direct equivalents and similar substitutes depends on circuit peak pulse power requirements.

All substitute parts share the following critical parameters with the main part:

Voltage - Reverse Standoff: 51V
Voltage - Breakdown (Min): 56.7V
Voltage - Clamping (Max): 82.4V
Package: DO-214AB, SMC
Mounting: Surface Mount
Type: Unidirectional Zener
RoHS3 Compliance

Parameter Comparison

Manufacturer	Part Number	Standoff (V)	Breakdown Min (V)	Clamp Max (V)	Peak Pulse (A)	Peak Power (W)	Temp Range (°C)	Package	Status
Micro Commercial Co	SMCJ51A-TP	51	56.7	82.4	18.2	1500	-55 to 175	DO-214AB	Active
Central Semiconductor Corp	1SMC51A TR13 PBFREE	51	56.7	82.4	18.2	1500	-65 to 150	DO-214AB	Active
MDD	SMCJ51A	51	56.7	82.4	18.2	1500	-50 to 150	DO-214AB	Active
Diodes Incorporated	SMCJ51A-13-F	51	56.7	82.4	18.2	1500	-55 to 150	DO-214AB	Active
Vishay General Semiconductor	SMCJ51A-E3/57T	51	56.7	82.4	18.2	1500	-55 to 150	DO-214AB	Active
Taiwan Semiconductor Corporation	5.0SMDJ51A	51	56.7	82.4	60.7	5000	-55 to 175	DO-214AB	Active
Alpha & Omega Semiconductor Inc.	SMDJ51A	51	56.7	82.4	36.5	3000	-55 to 150	DO-214AB	Active
Littelfuse Inc.	SMDJ51A-T7	51	56.7	82.4	36.4	3000	-65 to 150	DO-214AB	Active
Bourns Inc.	SMLJ51A	51	56.7	82.4	36.4	3000	-55 to 150	DO-214AB	Active

Engineering Selection Recommendations

Direct Equivalent Selection: Parts from Central Semiconductor Corp (1SMC51A TR13 PBFREE), MDD (SMCJ51A), Diodes Incorporated (SMCJ51A-13-F), and Vishay General Semiconductor (SMCJ51A-E3/57T) provide identical electrical performance to the SMCJ51A-TP. All are active production status with ROHS3 compliance. Selection among these direct equivalents depends on operating temperature requirements and packaging availability. The Micro Commercial Co original part operates to 175°C; substitutes typically operate to 150°C maximum, with Central Semiconductor and Littelfuse variants rated to -65°C minimum.

Higher-Power Variant Selection: Applications requiring greater transient energy absorption may use 5.0SMDJ51A (5000W), SMDJ51A (3000W), SMDJ51A-T7 (3000W), or SMLJ51A (3000W). These maintain identical voltage protection characteristics but provide 2× to 3.3× greater peak pulse current and power dissipation. All variants maintain DO-214AB package compatibility and surface-mount configuration. SMLJ51A from Bourns carries REACH Affected status; all others are REACH Unaffected.

Compliance Verification: All listed substitutes maintain ROHS3 compliance and EAR99 export classification. Moisture sensitivity level is 1 (Unlimited) across all parts. REACH status varies: most substitutes are REACH Unaffected; SMLJ51A is REACH Affected.

Frequently Asked Questions (FAQ)

Q: Can SMCJ51A-TP be replaced with 1SMC51A TR13 PBFREE? A: Yes. Both parts share identical voltage ratings (51V standoff, 56.7V breakdown, 82.4V clamp), peak pulse current (18.2A), and DO-214AB package. Operating temperature range differs: SMCJ51A-TP operates to 175°C; 1SMC51A TR13 PBFREE operates to 150°C maximum. Verify application temperature requirements before substitution.

Q: What is the difference between SMCJ51A-TP and SMDJ51A? A: Both maintain identical voltage protection (51V standoff, 82.4V clamp) and DO-214AB package. SMDJ51A provides higher peak pulse current (36.5A vs. 18.2A) and peak power (3000W vs. 1500W). SMDJ51A is suitable for applications with greater transient energy requirements. Voltage protection characteristics are identical.

Q: Is SMLJ51A compatible with SMCJ51A-TP? A: Yes, mechanically and electrically. SMLJ51A maintains identical voltage ratings and DO-214AB package. Peak pulse current is 36.4A (vs. 18.2A) and peak power is 3000W (vs. 1500W). SMLJ51A carries REACH Affected status; SMCJ51A-TP is REACH Unaffected. Verify supply chain requirements before substitution.

Q: Can 5.0SMDJ51A replace SMCJ51A-TP in all applications? A: Electrically yes for voltage protection; mechanically yes for package. 5.0SMDJ51A provides significantly higher peak pulse current (60.7A) and power (5000W). Use 5.0SMDJ51A only when circuit design requires greater transient energy absorption. Oversizing may introduce unnecessary cost and board space considerations.

Q: What are the key parameters for substitution compatibility? A: Voltage - Reverse Standoff (51V), Voltage - Breakdown minimum (56.7V), Voltage - Clamping maximum (82.4V), and DO-214AB package are mandatory for direct substitution. Peak pulse current and power ratings may be equal or higher depending on circuit requirements. Operating temperature range and compliance certifications must be verified for specific applications.

Q: Are all listed substitutes in active production? A: Yes. All substitute parts listed carry Active product status. Inventory availability varies by manufacturer and distributor. Verify current stock and lead times with component suppliers.

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