SMCJ40C Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The SMCJ40C is a 1500W bidirectional transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation. This surface mount component operates at a 40V reverse standoff voltage with a 71.4V maximum clamping voltage and 22A peak pulse current rating. The device is designed for general-purpose transient protection applications and is currently in active production status. Substitute parts are identified based on matching electrical specifications, mechanical compatibility, and packaging standards within the DO-214AB (SMC) form factor.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	40	V
Voltage - Breakdown (Min)	44.4	V
Voltage - Clamping (Max) @ Ipp	71.4	V
Current - Peak Pulse (10/1000µs)	22	A
Power - Peak Pulse	1500	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AB (SMC)	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the SMCJ40C are identified based on the following critical parameters that determine functional equivalence:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 40V
Voltage - Breakdown (Min): 44.4V minimum
Power - Peak Pulse: 1500W (1.5kW)
Bidirectional operation with single channel configuration
Type: Zener diode

Mechanical Compatibility Criteria:

Package / Case: DO-214AB (SMC)
Mounting Type: Surface Mount
Tape & Reel (TR) packaging format

Compliance Criteria:

RoHS3 Compliant
REACH Unaffected
Active product status

The SMCJ40CA from MDD meets all electrical and mechanical compatibility requirements. Both parts share identical reverse standoff voltage, breakdown voltage, peak pulse power rating, and package specifications. Variations in clamping voltage (71.4V vs. 64.5V) and peak pulse current (22A vs. 23.3A) remain within acceptable substitution parameters for general-purpose transient protection applications.

Parameter Comparison

Parameter	SMCJ40C (Taiwan Semiconductor)	SMCJ40CA (MDD)	Unit
Voltage - Reverse Standoff (Typ)	40	40	V
Voltage - Breakdown (Min)	44.4	44.4	V
Voltage - Clamping (Max) @ Ipp	71.4	64.5	V
Current - Peak Pulse (10/1000µs)	22	23.3	A
Power - Peak Pulse	1500	1500	W
Operating Temperature Range	-55 to 150	-50 to 150	°C
Package / Case	DO-214AB (SMC)	DO-214AB (SMC)	—
Mounting Type	Surface Mount	Surface Mount	—
Type	Zener	Zener	—
Bidirectional Channels	1	1	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
REACH Status	REACH Unaffected	REACH Unaffected	—

Engineering Selection Recommendations

Primary Selection (SMCJ40C): The SMCJ40C from Taiwan Semiconductor Corporation is the original specified component. It maintains active product status with established supply chain availability (794 pcs in stock). This part is recommended for applications where the original design specifications and manufacturer continuity are required.

Substitute Selection (SMCJ40CA): The SMCJ40CA from MDD is a qualified substitute meeting all critical electrical and mechanical parameters. Both parts are RoHS3 compliant and REACH unaffected. The SMCJ40CA offers significantly higher inventory availability (80,100 pcs in stock) and maintains the same 1500W peak pulse power rating and 40V reverse standoff voltage. The lower operating temperature minimum (-50°C vs. -55°C) applies only to applications operating below -50°C. The SMCJ40CA is suitable for direct substitution in general-purpose transient protection circuits where component sourcing flexibility is prioritized.

Compliance Verification: Both parts satisfy RoHS3 and REACH regulatory requirements. Selection between these parts does not introduce compliance risk in regulated markets.

Frequently Asked Questions (FAQ)

Q: Can SMCJ40CA replace SMCJ40C in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (40V), breakdown voltage (44.4V), and peak pulse power rating (1500W). The DO-214AB (SMC) package and surface mount configuration are identical. Direct substitution is supported for general-purpose transient protection applications.

Q: What is the significance of the different clamping voltages (71.4V vs. 64.5V)?

A: The clamping voltage represents the maximum voltage across the diode during a transient event at peak pulse current. The SMCJ40C clamps at 71.4V while the SMCJ40CA clamps at 64.5V. Both values are within acceptable ranges for 40V standoff voltage protection. The lower clamping voltage of the SMCJ40CA provides slightly more aggressive transient suppression.

Q: Are there temperature range differences between these parts?

A: The SMCJ40C operates from -55°C to 150°C, while the SMCJ40CA operates from -50°C to 150°C. For applications operating above -50°C, both parts are equivalent. Applications requiring operation below -50°C must use the SMCJ40C.

Q: Do both parts use the same package?

A: Yes. Both SMCJ40C and SMCJ40CA use the DO-214AB (SMC) surface mount package. PCB footprints and reflow soldering profiles are identical.

Q: What is the difference in peak pulse current ratings?

A: The SMCJ40C is rated for 22A peak pulse current, while the SMCJ40CA is rated for 23.3A. Both maintain the same 1500W peak pulse power specification. The higher current rating of the SMCJ40CA reflects improved current handling capability at equivalent power levels.

Q: Are both parts available in Tape & Reel packaging?

A: Yes. Both SMCJ40C and SMCJ40CA are supplied in Tape & Reel (TR) format suitable for automated assembly processes.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS3 compliant and REACH unaffected. No additional compliance documentation is required for substitution in regulated applications.

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