SMCJ40CE3/TR13

Part Overview

The SMCJ40CE3/TR13 is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener TVS diode operates at a 40V reverse standoff voltage with a 71.4V maximum clamping voltage and 21A peak pulse current capability. The component is RoHS3 compliant and actively produced. Equivalent and substitute parts are identified based on matching critical electrical and mechanical parameters within acceptable tolerance ranges for TVS diode selection.

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)	21	A
Power - Peak Pulse	1500	W
Package / Case	DO-214AB, SMC	-
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SMCJ40CE3/TR13 are identified based on the following critical parameters that must remain consistent for functional equivalence:

Essential Parameters for Substitution:

Voltage - Reverse Standoff (Typ): 40V (defines the protection threshold)
Voltage - Breakdown (Min): 44.4V (establishes activation characteristic)
Package / Case: DO-214AB, SMC (ensures mechanical and thermal compatibility)
Bidirectional Channels: 1 (confirms protection topology)
Type: Zener (maintains functional principle)
Mounting Type: Surface Mount (preserves assembly compatibility)

Allowable Parameter Variance:

Voltage - Clamping (Max) @ Ipp: Substitute parts range from 64.5V to 84V (within acceptable overvoltage protection envelope)
Current - Peak Pulse (10/1000µs): Substitute parts range from 23.2A to 119A (higher capability provides enhanced transient handling)
Power - Peak Pulse: Substitute parts range from 1500W to 5000W (higher ratings offer additional margin)
Operating Temperature: Minimum junction temperature ranges from -55°C to -65°C; maximum ranges from 150°C to 175°C (application-dependent selection)

Substitute parts maintain the same base product number series (SMCJ40, SMDJ40, SMLJ40) and comply with equivalent RoHS and regulatory standards.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	Vc @ Ipp (V)	Ipp (A)	Power (W)	Temp Range (°C)	Status
SMCJ40CE3/TR13	Microchip Technology	40	71.4	21	1500	-65 to 150	Active
5.0SMDJ40CA	MDE Semiconductor Inc	40	64.5	77.6	5000	-55 to 150	Active
SMCJ40CA	MDD	40	64.5	23.3	1500	-50 to 150	Active
SMCJ40CA-13-F	Diodes Incorporated	40	64.5	23.2	1500	-55 to 150	Active
SMCJ40CA-TR	STMicroelectronics	40	84	119	1500	-55 to 150	Active
SMDJ40CA	Alpha & Omega Semiconductor Inc.	40	64.5	46.6	3000	-55 to 150	Active
SMLJ40CA	Bourns Inc.	40	64.5	46.4	3000	-55 to 150	Active
SMLJ40CA-TP	Micro Commercial Co	40	64.5	46.4	3000	-55 to 175	Active

Engineering Selection Recommendations

All identified substitute parts maintain active product status with RoHS3 compliance, ensuring regulatory alignment with the SMCJ40CE3/TR13. Selection between substitute options is determined by application-specific requirements:

For Direct Replacement: SMCJ40CA (MDD) and SMCJ40CA-13-F (Diodes Incorporated) provide equivalent electrical characteristics with identical 1500W power ratings and comparable peak pulse currents (23.3A and 23.2A respectively). Both support the -50°C to -55°C lower temperature range of the original design.

For Enhanced Transient Protection: SMDJ40CA (Alpha & Omega Semiconductor), SMLJ40CA (Bourns), and SMLJ40CA-TP (Micro Commercial Co) offer doubled power dissipation capability (3000W) with proportionally increased peak pulse currents (46.6A and 46.4A). SMLJ40CA-TP extends the maximum junction temperature to 175°C, supporting high-temperature applications.

For Maximum Transient Margin: 5.0SMDJ40CA (MDE Semiconductor) and SMCJ40CA-TR (STMicroelectronics) provide the highest peak pulse current capabilities (77.6A and 119A) with correspondingly higher power ratings (5000W and 1500W). SMCJ40CA-TR exhibits the highest clamping voltage at 84V, suitable for applications requiring maximum voltage suppression headroom.

Component selection must confirm thermal and electrical margin requirements of the protected circuit, with particular attention to peak transient amplitude and duration specifications.

Frequently Asked Questions (FAQ)

Q: What determines if a part is a valid substitute for the SMCJ40CE3/TR13?

A: Valid substitutes must maintain the same 40V reverse standoff voltage, 44.4V minimum breakdown voltage, and DO-214AB SMC package format. All substitute parts listed meet these core electrical and mechanical criteria. Differences in clamping voltage, peak pulse current, and power dissipation reflect design variants within the 40V protection class.

Q: Can I use a substitute with higher peak pulse current rating?

A: Yes. Substitute parts with higher Ipp ratings (such as SMDJ40CA at 46.6A or SMCJ40CA-TR at 119A) provide increased transient handling capacity. These parts remain functionally equivalent and are directly substitutable when circuit protection requirements can accommodate the enhanced capability. No circuit modification is required.

Q: Does the clamping voltage difference affect substitution compatibility?

A: Clamping voltage differences between 64.5V and 84V represent design variations within acceptable limits for the 40V standoff class. Lower clamping voltages (64.5V from SMDJ40CA, SMLJ40CA, SMLJ40CA-TP) provide tighter overvoltage suppression. Higher clamping voltages (84V from SMCJ40CA-TR) offer increased suppression margin. Circuit designers must confirm the protected device tolerance to the specific clamping voltage.

Q: Are all substitute parts in the same package?

A: All substitute parts use the DO-214AB SMC surface-mount package, ensuring identical board-level footprint and assembly compatibility. Packaging variants (Tape & Reel, Cut Tape, Digi-Reel) reflect distribution formats only and do not affect electrical or mechanical characteristics.

Q: What is the impact of different operating temperature ranges?

A: Substitute parts support junction temperature ranges from -50°C to 175°C. The original SMCJ40CE3/TR13 operates from -65°C to 150°C. Substitutes with narrower lower temperature limits (-50°C minimum) are suitable for applications not requiring extended cold-temperature operation. SMLJ40CA-TP extends the upper limit to 175°C for high-temperature environments.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry RoHS3 compliance certification. One substitute (SMLJ40CA from Bourns) carries REACH Affected status, whereas others carry REACH Unaffected status. Circuit designers must confirm REACH compliance requirements for target applications and geographies.

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