SMCJ40C Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMCJ40C is a bidirectional Zener transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 40V reverse standoff voltage with 67.73V maximum clamping voltage and 23.3A peak pulse current capability in a DO-214AB (SMC) package. The SMCJ40C is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	40	V
Voltage - Breakdown (Min)	42.08	V
Voltage - Clamping (Max) @ Ipp	67.73	V
Current - Peak Pulse (10/1000µs)	23.3	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	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the SMCJ40C is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 40V
Package / Case: DO-214AB, SMC (surface mount)
Mounting Type: Surface Mount
Type: Zener, Bidirectional
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

Voltage - Breakdown (Min): 42.08V to 44.4V range
Voltage - Clamping (Max) @ Ipp: 64.5V to 71.4V range
Current - Peak Pulse (10/1000µs): 21A to 46.4A range
Power - Peak Pulse: 1500W to 3000W range
Operating Temperature Range: -55°C to 150°C minimum

Substitute parts are grouped into two categories based on clamping voltage characteristics: Category A (64.5V clamping) and Category B (71.4V clamping). Both categories maintain the 40V reverse standoff voltage and DO-214AB package specification required for direct mechanical and electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Product Status
SMCJ40C	Littelfuse Inc.	40	42.08	67.73	23.3	1500	-55 to 150	Obsolete
SMCJ40CA	MDD	40	44.4	64.5	23.3	1500	-50 to 150	Active
SMCJ40CA-13-F	Diodes Incorporated	40	44.4	64.5	23.2	1500	-55 to 150	Active
SMCJ40CAE3/TR13	Microchip Technology	40	44.4	64.5	23.2	1500	-65 to 150	Active
SMCJ40CE3/TR13	Microchip Technology	40	44.4	71.4	21	1500	-65 to 150	Active
SMLJ40CA	Bourns Inc.	40	44.4	64.5	46.4	3000	-55 to 150	Active
SMLJ40CA-TP	Micro Commercial Co	40	44.4	64.5	46.4	3000	-55 to 175	Active
SMLJ40CAE3/TR13	Microchip Technology	40	44.4	64.5	46.4	300	-55 to 150	Active
TV15C400JB-G	Comchip Technology	40	44.4	71.4	21.01	1500	-55 to 150	Active

Engineering Selection Recommendations

Direct Replacement (Lowest Risk): SMCJ40CA-13-F (Diodes Incorporated) and SMCJ40CAE3/TR13 (Microchip Technology) are the primary direct replacements. Both maintain identical 40V reverse standoff voltage, 64.5V clamping voltage, 23.2A peak pulse current, 1500W peak power, and DO-214AB package specification. SMCJ40CAE3/TR13 offers extended operating temperature range (-65°C to 150°C) and active product status with full ROHS3 compliance and REACH unaffected certification.

Higher Current Capability Alternatives: SMLJ40CA (Bourns Inc.) and SMLJ40CA-TP (Micro Commercial Co) provide doubled peak pulse current (46.4A) and doubled peak power (3000W) while maintaining the 40V reverse standoff and 64.5V clamping voltage. These are suitable for applications requiring enhanced transient energy absorption. SMLJ40CA-TP extends operating temperature to 175°C.

Higher Clamping Voltage Alternatives: SMCJ40CE3/TR13 (Microchip Technology) and TV15C400JB-G (Comchip Technology) provide 71.4V clamping voltage with reduced peak pulse current (21A to 21.01A). These are applicable where higher clamping voltage is acceptable and peak current requirements are lower.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and surface-mount DO-214AB package compatibility. Product status verification confirms all listed substitutes are active components available for new designs.

Frequently Asked Questions (FAQ)

Q: Can SMCJ40CA directly replace SMCJ40C in existing designs? A: SMCJ40CA maintains the critical electrical parameters: 40V reverse standoff voltage, 64.5V clamping voltage, 23.3A peak pulse current, and 1500W peak power. The DO-214AB package is mechanically identical. Substitution is valid provided the application does not require the specific -55°C lower temperature limit of the original SMCJ40C; SMCJ40CA operates from -50°C.

Q: What is the difference between SMCJ40CA and SMLJ40CA? A: Both maintain 40V reverse standoff and 64.5V clamping voltage in DO-214AB packages. SMLJ40CA provides doubled peak pulse current (46.4A versus 23.3A) and doubled peak power (3000W versus 1500W). Selection depends on transient energy absorption requirements. SMLJ40CA is suitable for higher-energy transient events.

Q: Are SMCJ40CE3/TR13 and TV15C400JB-G interchangeable with SMCJ40C? A: Both parts maintain 40V reverse standoff voltage and DO-214AB package. However, clamping voltage is 71.4V compared to SMCJ40C's 67.73V, and peak pulse current is reduced to 21A. These parts are substitutes only when the application circuit design accommodates higher clamping voltage and lower peak current specifications.

Q: What does the "/TR13" suffix indicate? A: The "/TR13" suffix indicates Tape & Reel packaging format with 13-inch reel specification, standard for high-volume surface-mount production. This is a packaging designation and does not affect electrical performance or compatibility.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts are ROHS3 compliant. Moisture Sensitivity Level is 1 (Unlimited) for all parts, indicating no moisture sensitivity restrictions during storage and handling.

Q: Which substitute offers the widest operating temperature range? A: SMLJ40CA-TP (Micro Commercial Co) operates from -55°C to 175°C, providing the widest temperature range. SMCJ40CAE3/TR13 (Microchip Technology) extends the lower limit to -65°C while maintaining 150°C upper limit.

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