SMCJ78CA-13 Equivalent & Substitute Parts

Part Overview

The SMCJ78CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 78V reverse standoff voltage and provides 126V maximum clamping voltage at 11.4A peak pulse current, delivering 1500W peak pulse power dissipation in a DO-214AB (SMC) package.

The SMCJ78CA-13 is discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers with identical or enhanced electrical characteristics, offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	78	V
Voltage - Breakdown (Min)	86.7	V
Voltage - Clamping (Max) @ Ipp	126	V
Current - Peak Pulse (10/1000µs)	11.4	A
Power - Peak Pulse	1500	W
Type	Zener	—
Bidirectional Channels	1	—
Package / Case	DO-214AB, SMC	—
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the SMCJ78CA-13 is determined by the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 78V (±tolerance)
Voltage - Breakdown (Min): 86.7V minimum
Voltage - Clamping (Max) @ Ipp: 126V maximum
Current - Peak Pulse (10/1000µs): 11.4A minimum
Power - Peak Pulse: 1500W minimum
Package / Case: DO-214AB (SMC) surface mount
Type: Zener, bidirectional, single channel
Operating Temperature: -55°C to 150°C minimum

Substitute parts must meet or exceed these parameters. Parts with higher peak pulse current or power dissipation are acceptable as they provide enhanced protection capability. Packaging must remain DO-214AB (SMC) for PCB compatibility. Operating temperature range must encompass the original specification minimum.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Product Status	RoHS Status
SMCJ78CA-13	Diodes Incorporated	78	86.7	126	11.4	1500	-55 to 150	Discontinued	Non-compliant
SMCJ78CA-13-F	Diodes Incorporated	78	86.7	126	11.4	1500	-55 to 150	Active	ROHS3 Compliant
1SMC78CA TR13 PBFREE	Central Semiconductor Corp	78	86.7	126	11.4	1500	-65 to 150	Active	ROHS3 Compliant
5.0SMLJ78CA-TP	Micro Commercial Co	78	86.7	126	39.7	5000	-55 to 175	Active	ROHS3 Compliant
ATV15C780JB-HF	Comchip Technology	78	86.7	126	11.9	1500	-55 to 150	Active	ROHS3 Compliant
SMCJ78C	Taiwan Semiconductor Corporation	78	86.7	139	11.3	1500	-55 to 150	Active	ROHS3 Compliant
SMCJ78CA	MDD	78	86.7	126	11.9	1500	-50 to 150	Active	ROHS3 Compliant
SMCJ78CA-E3/57T	Vishay General Semiconductor - Diodes Division	78	86.7	126	11.9	1500	-55 to 150	Active	ROHS3 Compliant
SMCJ78CA-E3/9AT	Vishay General Semiconductor - Diodes Division	78	86.7	126	11.9	1500	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts meet the electrical and mechanical requirements of the SMCJ78CA-13. Selection should be based on the following criteria:

Direct Replacement (Identical Specifications): SMCJ78CA-13-F from Diodes Incorporated is the direct active equivalent with identical electrical parameters and ROHS3 compliance. This part maintains the original manufacturer lineage and is recommended for designs requiring minimal qualification effort.

Enhanced Performance Options: 5.0SMLJ78CA-TP from Micro Commercial Co provides 39.7A peak pulse current and 5000W power dissipation, exceeding the original 11.4A and 1500W specifications. This part offers superior transient protection margin and extended operating temperature range (-55°C to 175°C). Use this part when enhanced overvoltage protection is required or when thermal margin is critical.

Automotive-Grade Alternative: ATV15C780JB-HF from Comchip Technology carries AEC-Q101 automotive qualification and ROHS3 compliance. This part is suitable for automotive and industrial applications requiring automotive-grade component certification.

High-Volume Availability: SMCJ78CA-E3/57T from Vishay General Semiconductor offers the highest inventory (34,200 pcs) with established supply chain reliability. This part is suitable for high-volume production requiring assured long-term availability.

Extended Temperature Range: 1SMC78CA TR13 PBFREE from Central Semiconductor Corp extends the lower operating temperature to -65°C, providing enhanced performance in extreme cold environments.

All substitute parts are ROHS3 compliant, addressing the non-compliance status of the original SMCJ78CA-13.

Frequently Asked Questions (FAQ)

Q: Can SMCJ78CA-13-F be used as a direct replacement for SMCJ78CA-13? A: Yes. SMCJ78CA-13-F is the active equivalent from Diodes Incorporated with identical electrical specifications (78V standoff, 126V clamping, 11.4A peak pulse, 1500W power). The primary difference is active product status and ROHS3 compliance. Packaging and pinout are identical.

Q: What is the difference between SMCJ78CA-13 and 5.0SMLJ78CA-TP? A: Both parts share the same voltage ratings (78V standoff, 126V clamping). The 5.0SMLJ78CA-TP provides significantly higher peak pulse current (39.7A vs. 11.4A) and power dissipation (5000W vs. 1500W). The 5.0SMLJ78CA-TP is suitable for applications requiring enhanced transient protection or higher energy absorption capability.

Q: Are all substitute parts in the same DO-214AB (SMC) package? A: Yes. All listed substitute parts use the DO-214AB (SMC) surface-mount package, ensuring PCB footprint and reflow compatibility with the original SMCJ78CA-13.

Q: Which substitute part has the best long-term availability? A: SMCJ78CA-E3/57T from Vishay General Semiconductor has the highest reported inventory (34,200 pcs) and is from an established manufacturer with strong supply chain presence. This part is recommended for high-volume production requiring assured availability.

Q: Can I use SMCJ78C as a substitute? A: SMCJ78C from Taiwan Semiconductor Corporation meets the voltage and current requirements. However, it specifies a maximum clamping voltage of 139V compared to the original 126V. This higher clamping voltage may affect circuit protection performance in applications with tight voltage tolerance requirements. Verify circuit compatibility before selection.

Q: What is the advantage of ATV15C780JB-HF? A: ATV15C780JB-HF carries AEC-Q101 automotive qualification, making it suitable for automotive and industrial applications requiring automotive-grade component certification. Electrical specifications match the original part.

Q: Does operating temperature range affect substitution? A: Operating temperature range must encompass the original specification minimum (-55°C to 150°C). All listed substitutes meet or exceed this requirement. 1SMC78CA TR13 PBFREE extends to -65°C for enhanced cold-temperature performance. 5.0SMLJ78CA-TP extends to 175°C for enhanced high-temperature performance.

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