SMCJ51CA-13 Equivalent & Substitute Parts

Part Overview

The SMCJ51CA-13 is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in DO-214AB (SMC) surface mount package. This component is designed for general-purpose transient voltage suppression with a reverse standoff voltage of 51V and peak pulse power rating of 1500W. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and supply chain reliability.

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
Type	Zener	—
Bidirectional Channels	1	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55 to 150	°C

Substitute Part Grouping Explanation

Substitution of the SMCJ51CA-13 is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 51V
Voltage - Breakdown (Min): 56.7V
Voltage - Clamping (Max) @ Ipp: 82.4V
Bidirectional Channels: 1
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C (minimum)

Substitute parts are grouped into two categories based on peak pulse current and power rating:

Category A - Direct Electrical Equivalents (18.2A / 1500W): Parts with identical peak pulse current and power dissipation specifications. These provide one-to-one functional replacement with no design modifications required.

Category B - Higher Performance Alternatives (36.4A–60.7A / 3000W–5000W): Parts with elevated peak pulse current and power ratings while maintaining identical voltage specifications and package form factor. These provide enhanced transient suppression capability and may be used as drop-in replacements where increased margin is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vwm (V)	Vbr (V)	Vc (V)	Ipp (A)	Ppk (W)	Package	Status	RoHS
SMCJ51CA-13	Diodes Incorporated	51	56.7	82.4	18.2	1500	DO-214AB, SMC	Discontinued	Non-compliant
SMCJ51CA-13-F	Diodes Incorporated	51	56.7	82.4	18.2	1500	DO-214AB, SMC	Active	ROHS3 Compliant
SMCJ51CA	Good-Ark Semiconductor	51	56.7	82.4	18.2	1500	DO-214AB, SMC	Active	ROHS3 Compliant
SMLJ51CA	Bourns Inc.	51	56.7	82.4	36.4	3000	DO-214AB, SMC	Active	ROHS3 Compliant
SMDJ51CA	Alpha & Omega Semiconductor Inc.	51	56.7	82.4	36.5	3000	DO-214AB, SMC	Active	ROHS3 Compliant
SMDJ51CA-T7	Littelfuse Inc.	51	56.7	82.4	36.4	3000	DO-214AB, SMC	Active	ROHS3 Compliant
5.0SMDJ51CA	MDE Semiconductor Inc	51	56.7	82.4	60.7	5000	DO-214AB, SMC	Active	ROHS3 Compliant
5.0SMDJ51CA-T7	Littelfuse Inc.	51	56.7	82.4	60.7	5000	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement:

SMCJ51CA-13-F (Diodes Incorporated) is the preferred substitute. This part maintains identical electrical specifications and package form factor as the original SMCJ51CA-13 while offering active product status and ROHS3 compliance. The "-F" suffix indicates Tape & Reel packaging, suitable for automated assembly processes.

Secondary Recommendation - Alternative Manufacturer:

SMCJ51CA (Good-Ark Semiconductor) provides equivalent electrical and mechanical specifications with active status and ROHS3 compliance. This option expands supply chain flexibility through a second-source manufacturer.

Higher Performance Alternatives:

SMLJ51CA (Bourns Inc.), SMDJ51CA (Alpha & Omega Semiconductor Inc.), and SMDJ51CA-T7 (Littelfuse Inc.) offer 3000W peak pulse power with 36.4–36.5A peak pulse current. These parts maintain voltage specifications and package compatibility while providing increased transient suppression margin. Selection is appropriate where design margins permit higher power dissipation.

Maximum Performance Alternative:

5.0SMDJ51CA (MDE Semiconductor Inc.) and 5.0SMDJ51CA-T7 (Littelfuse Inc.) deliver 5000W peak pulse power with 60.7A peak pulse current. These parts are suitable for applications requiring maximum transient suppression capability within the same voltage class and package envelope.

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term supply availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can SMCJ51CA-13-F be used as a direct replacement for SMCJ51CA-13?

A: Yes. SMCJ51CA-13-F is electrically and mechanically identical to SMCJ51CA-13, with the primary difference being packaging format (Tape & Reel) and active product status. No circuit modifications are required.

Q: What is the difference between SMCJ51CA-13 and SMLJ51CA?

A: Both parts share identical voltage specifications (51V Vwm, 82.4V Vc) and DO-214AB package. SMLJ51CA provides doubled peak pulse power (3000W vs. 1500W) and current (36.4A vs. 18.2A). SMLJ51CA is a drop-in replacement offering increased transient suppression capability.

Q: Are the 5.0SMDJ series parts compatible with the original SMCJ51CA-13 design?

A: Yes, from a package and voltage perspective. The 5.0SMDJ series maintains 51V reverse standoff voltage and DO-214AB package form factor. Peak pulse power is increased to 5000W with 60.7A current. Compatibility depends on circuit design tolerance for higher power dissipation and current handling.

Q: What does the "-T7" suffix indicate?

A: The "-T7" suffix denotes Littelfuse Inc. packaging specification and tape configuration for automated assembly. Electrical specifications remain identical to equivalent parts without this suffix.

Q: Can I substitute a higher power-rated part (3000W or 5000W) for the original 1500W part?

A: Yes. Higher power-rated parts with identical voltage specifications and package form factor are functionally compatible. The increased power rating provides additional transient suppression margin without affecting normal circuit operation.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes carry ROHS3 compliance certification. The original SMCJ51CA-13 is ROHS non-compliant. ROHS3-compliant alternatives ensure regulatory compliance for new designs and manufacturing.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Both packaging formats contain identical components. Tape & Reel (TR) is supplied on continuous carrier tape suitable for high-speed automated pick-and-place assembly. Cut Tape (CT) is supplied in shorter tape segments for lower-volume or manual assembly processes. Electrical specifications are unchanged.

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