SMCJ43A-13 Transient Voltage Suppressor (TVS) Diode — Equivalent & Substitute Parts

Part Overview

The SMCJ43A-13 is a unidirectional Zener TVS diode manufactured by Diodes Incorporated, designed for transient voltage suppression in general-purpose applications. It features a 43V reverse standoff voltage, 69.4V maximum clamping voltage, and 21.6A peak pulse current in a surface-mount SMC (DO-214AB) package. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	43V
Voltage - Breakdown (Min)	47.8V
Voltage - Clamping (Max) @ Ipp	69.4V
Current - Peak Pulse (10/1000µs)	21.6A
Power - Peak Pulse	1500W
Operating Temperature Range	-55°C to 150°C (TJ)
Package / Case	DO-214AB, SMC
Type	Zener, Unidirectional

Substitute Part Grouping Explanation

Substitute parts are grouped into two categories based on electrical performance and power rating:

Category 1: Direct Electrical Equivalents (1500W Power Rating) These parts maintain identical voltage specifications (43V standoff, 47.8V breakdown, 69.4V clamping) and equivalent peak pulse current (21.6–21.7A). They are pin-compatible in DO-214AB/SMC packages and suitable for direct replacement in applications where the original 1500W power dissipation is sufficient.

Category 2: Higher Power Alternatives (3000W–5000W Power Ratings) These parts maintain identical voltage specifications but provide increased peak pulse current (43.2–72.1A) and higher power dissipation (3000W–5000W). Selection from this category is appropriate only when the application requires enhanced transient energy absorption beyond the original 1500W specification.

Key Parameters Determining Substitution:

Voltage - Reverse Standoff: 43V (fixed)
Voltage - Breakdown (Min): 47.8V (fixed)
Voltage - Clamping (Max) @ Ipp: 69.4V (fixed)
Package / Case: DO-214AB, SMC (fixed)
Unidirectional Channels: 1 (fixed)

Parameter Comparison

Part Number	Manufacturer	Standoff (V)	Breakdown (V)	Clamp (V)	Peak Current (A)	Power (W)	Temp Range (°C)	Status	RoHS
SMCJ43A-13	Diodes Incorporated	43	47.8	69.4	21.6	1500	-55 to 150	Discontinued	Non-compliant
SMCJ43A-13-F	Diodes Incorporated	43	47.8	69.4	21.6	1500	-55 to 150	Active	Compliant
SMCJ43A	MDD	43	47.8	69.4	21.7	1500	-50 to 150	Active	Compliant
SMCJ43A-TP	Micro Commercial Co	43	47.8	69.4	21.7	1500	-55 to 175	Active	Compliant
SMDJ43A	Alpha & Omega Semiconductor Inc.	43	47.8	69.4	43.3	3000	-55 to 150	Active	Compliant
SMDJ43A-T7	Littelfuse Inc.	43	47.8	69.4	43.2	3000	-65 to 150	Active	Compliant
SMLJ43A	Bourns Inc.	43	47.8	69.4	43.2	3000	-55 to 150	Active	Compliant
5.0SMDJ43A	Taiwan Semiconductor Corporation	43	47.8	69.4	72.1	5000	-55 to 175	Active	Compliant
5.0SMDJ43A-T7	Littelfuse Inc.	43	47.8	69.4	72.1	5000	-65 to 150	Active	Compliant

Engineering Selection Recommendations

Direct Replacement (1500W Category): SMCJ43A-13-F (Diodes Incorporated) is the primary direct substitute. It maintains identical electrical specifications and packaging while offering active product status and RoHS3 compliance. SMCJ43A-TP (Micro Commercial Co) provides equivalent performance with extended upper operating temperature (175°C) and wider lower temperature range (-55°C).

Alternative Suppliers (1500W Category): SMCJ43A (MDD) offers active status and compliance but operates to -50°C minimum, which may be limiting in extreme cold environments.

Higher Power Applications (3000W Category): SMDJ43A (Alpha & Omega Semiconductor Inc.), SMDJ43A-T7 (Littelfuse Inc.), and SMLJ43A (Bourns Inc.) provide doubled peak pulse current and power dissipation. Selection is appropriate only when application analysis confirms transient energy requirements exceed 1500W. All three maintain identical voltage specifications and DO-214AB packaging.

Maximum Power Applications (5000W Category): 5.0SMDJ43A (Taiwan Semiconductor Corporation) and 5.0SMDJ43A-T7 (Littelfuse Inc.) provide the highest transient energy absorption capability with 72.1A peak pulse current. These are suitable only for applications requiring 5000W power dissipation capacity.

Compliance Considerations: All active substitutes are RoHS3 compliant. The original SMCJ43A-13 is RoHS non-compliant; migration to compliant alternatives is recommended for new designs and procurement cycles.

Frequently Asked Questions (FAQ)

Q: Can SMCJ43A-13-F replace SMCJ43A-13 directly? A: Yes. SMCJ43A-13-F is electrically and mechanically identical, with the primary difference being active product status and RoHS3 compliance. It is supplied in Tape & Reel packaging.

Q: What is the difference between 1500W and 3000W TVS diodes in this voltage class? A: The 1500W parts (SMCJ43A series) handle 21.6–21.7A peak pulse current. The 3000W parts (SMDJ43A and SMLJ43A) handle 43.2–43.3A peak pulse current. Both maintain identical voltage clamping characteristics. Selection depends on the transient energy present in the application circuit.

Q: Are the 5000W parts (5.0SMDJ43A) compatible with the original SMCJ43A-13 circuit? A: Yes, electrically and mechanically. However, the 5000W rating is only necessary if circuit analysis confirms transient energy exceeds 3000W. Oversizing provides no performance benefit and increases component cost.

Q: Does operating temperature range affect substitution suitability? A: Operating temperature range affects suitability only if the application operates outside the specified range. SMCJ43A-TP extends to 175°C; SMDJ43A-T7 and 5.0SMDJ43A-T7 extend to -65°C minimum. Standard parts operate -55°C to 150°C.

Q: What packaging formats are available? A: All substitutes are supplied in DO-214AB (SMC) surface-mount packages. SMCJ43A-13-F, SMCJ43A-TP, and all higher-power alternatives are available in Tape & Reel (TR) format for automated assembly. Bulk packaging may be available from specific manufacturers upon inquiry.

Q: Is REACH compliance relevant for this part selection? A: REACH status is provided for regulatory tracking. Most active substitutes are REACH Unaffected or REACH Affected. Verify specific regulatory requirements for your application and region.

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