SMCJ40CA-13 Equivalent & Substitute Parts

Part Overview

The SMCJ40CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 40V reverse standoff voltage with a 64.5V maximum clamping voltage and 23.2A peak pulse current capability in a DO-214AB (SMC) package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	40	V
Voltage - Breakdown (Min)	44.4	V
Voltage - Clamping (Max) @ Ipp	64.5	V
Current - Peak Pulse (10/1000µs)	23.2	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	—

Substitute Part Grouping Explanation

Substitute parts for the SMCJ40CA-13 are categorized based on strict electrical and mechanical parameter alignment:

Direct Electrical Equivalents (1:1 Substitution): Parts maintaining identical voltage ratings (40V reverse standoff, 44.4V breakdown minimum, 64.5V clamping maximum), identical bidirectional channel configuration (1 channel), and compatible DO-214AB/SMC packaging. These parts differ only in manufacturer, product status, or packaging format (bulk vs. tape & reel).

Higher Current Capability Alternatives: Parts with identical voltage specifications but increased peak pulse current (46.4A to 77.6A) and proportionally higher power dissipation (3000W to 5000W). These provide enhanced transient protection margin while maintaining voltage compatibility.

Clamping Voltage Variance: The STMicroelectronics SMCJ40CA-TR exhibits a higher clamping voltage (84V maximum) with significantly increased peak pulse current (119A at 8/20µs pulse), representing a different protection profile suitable for applications requiring higher energy absorption.

Key Parameters Determining Substitution:

Voltage - Reverse Standoff: 40V (fixed requirement)
Voltage - Breakdown (Min): 44.4V (fixed requirement)
Voltage - Clamping (Max): 64.5V (primary variants: 64.5V or 84V)
Package / Case: DO-214AB, SMC (fixed requirement)
Bidirectional Channels: 1 (fixed requirement)
Current - Peak Pulse: 23.2A minimum (variants: 23.3A to 119A)

Parameter Comparison

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
SMCJ40CA-13	Diodes Incorporated	40	44.4	64.5	23.2	1500	-55 to 150	Discontinued	Non-compliant
SMCJ40CA-13-F	Diodes Incorporated	40	44.4	64.5	23.2	1500	-55 to 150	Active	ROHS3 Compliant
SMCJ40CA	MDD	40	44.4	64.5	23.3	1500	-50 to 150	Active	ROHS3 Compliant
5.0SMDJ40CA	MDE Semiconductor Inc	40	44.4	64.5	77.6	5000	-55 to 150	Active	ROHS3 Compliant
5.0SMDJ40CA-T7	Littelfuse Inc.	40	44.4	64.5	77.6	5000	-65 to 150	Active	ROHS3 Compliant
SMCJ40CA-TR	STMicroelectronics	40	44.4	84	119	1500	-55 to 150	Active	ROHS3 Compliant
SMDJ40CA	Alpha & Omega Semiconductor Inc.	40	44.4	64.5	46.6	3000	-55 to 150	Active	ROHS3 Compliant
SMDJ40CA-T7	Littelfuse Inc.	40	44.4	64.5	46.5	3000	-65 to 150	Active	ROHS3 Compliant
SMLJ40CA	Bourns Inc.	40	44.4	64.5	46.4	3000	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Direct Replacement: SMCJ40CA-13-F (Diodes Incorporated) provides identical electrical specifications and is the direct active equivalent. This part maintains the original 1500W power rating and 23.2A peak pulse current while offering ROHS3 compliance and active product status with 2000 pcs inventory availability.

Equivalent Alternative (Minimal Variance): SMCJ40CA (MDD) delivers functionally equivalent performance with a negligible 0.1A increase in peak pulse current (23.3A vs. 23.2A) and maintains the 1500W power specification. Operating temperature range is reduced by 5°C at the lower bound (-50°C vs. -55°C). This option provides 80,100 pcs inventory and ROHS3 compliance.

Enhanced Protection Options: SMDJ40CA (Alpha & Omega Semiconductor Inc.), SMDJ40CA-T7 (Littelfuse Inc.), and SMLJ40CA (Bourns Inc.) offer doubled power dissipation (3000W) with proportionally increased peak pulse current (46.4A to 46.6A). These are suitable for applications requiring additional transient energy absorption margin while maintaining identical voltage thresholds. All three are ROHS3 compliant and actively produced.

High-Energy Alternative: 5.0SMDJ40CA (MDE Semiconductor Inc.) and 5.0SMDJ40CA-T7 (Littelfuse Inc.) provide 5000W peak pulse power with 77.6A peak pulse current, representing the highest protection capability within the 40V voltage class. The Littelfuse variant extends operating temperature to -65°C.

Non-Recommended: SMCJ40CA-TR (STMicroelectronics) exhibits a significantly higher clamping voltage (84V vs. 64.5V), which alters the protection characteristic and is not a direct substitute despite identical reverse standoff voltage.

Frequently Asked Questions (FAQ)

Q: Can SMCJ40CA-13-F directly replace SMCJ40CA-13 without circuit modification?

A: Yes. SMCJ40CA-13-F is electrically and mechanically identical to SMCJ40CA-13, differing only in packaging format (tape & reel vs. bulk) and compliance status (ROHS3 vs. non-compliant). No circuit changes are required.

Q: What is the difference between SMCJ40CA-13 and SMDJ40CA?

A: Both maintain identical voltage specifications (40V reverse standoff, 44.4V breakdown, 64.5V clamping). SMDJ40CA provides doubled power dissipation (3000W vs. 1500W) and doubled peak pulse current (46.6A vs. 23.2A), offering enhanced transient protection. The DO-214AB package remains identical.

Q: Why does SMCJ40CA-TR have a higher clamping voltage (84V)?

A: SMCJ40CA-TR is a different protection profile within the 40V reverse standoff class. The 84V clamping voltage represents a different design trade-off, absorbing higher energy transients at the cost of increased clamping voltage. This part is not a direct substitute for applications requiring 64.5V maximum clamping.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original SMCJ40CA-13 is RoHS non-compliant. SMCJ40CA-13-F provides the compliant equivalent from the same manufacturer.

Q: What is the impact of operating temperature range differences?

A: SMCJ40CA (MDD) operates from -50°C to 150°C versus -55°C to 150°C for SMCJ40CA-13. This 5°C reduction at the lower bound is acceptable for most applications unless the design specifically requires operation below -50°C. Littelfuse variants (5.0SMDJ40CA-T7, SMDJ40CA-T7) extend the lower limit to -65°C for enhanced cold-temperature performance.

Q: Can higher current-rated parts (SMDJ, SMLJ, 5.0SMDJ series) be used in place of SMCJ40CA-13?

A: Yes, with the understanding that higher current ratings provide additional protection margin. These parts maintain identical voltage thresholds and package compatibility. Circuit performance remains unchanged; transient suppression is enhanced due to increased current handling capacity.

Q: What packaging formats are available?

A: Substitute parts are available in tape & reel (TR) and cut tape (CT) formats. SMCJ40CA-13-F and SMCJ40CA (MDD) are standard tape & reel packaging. Verify packaging requirements with your procurement process, as some suppliers may require specific formats for automated assembly.

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