SMCJ43CA-13 Equivalent & Substitute Parts

Part Overview

The SMCJ43CA-13 is a 43V bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated in DO-214AB (SMC) surface mount package. This component is designed for general-purpose transient voltage protection applications with a peak pulse power rating of 1500W and peak pulse current of 21.6A at 10/1000µs waveform. 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
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
Type	Zener
Bidirectional Channels	1
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
Operating Temperature	-55°C ~ 150°C (TJ)

Substitute Part Grouping Explanation

Substitution eligibility for the SMCJ43CA-13 is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 43V
Voltage - Breakdown (Min): 47.8V
Voltage - Clamping (Max) @ Ipp: 69.4V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Bidirectional Channels: 1
Type: Zener

Substitute parts are grouped into two categories:

Direct Equivalents (1:1 Substitution): Parts maintaining identical electrical specifications and 1500W peak pulse power rating. These include SMCJ43CA-13-F (Diodes Incorporated, Tape & Reel packaging), SMCJ43CA (Meritek), and SMCJ43CA-TP (Micro Commercial Co). These parts satisfy all core electrical parameters and package requirements.

Higher-Rated Alternatives (Upward Compatible): Parts with identical voltage specifications but elevated peak pulse current and power ratings. These include 5.0SMDJ43CA-T7 (Littelfuse Inc., 72.1A / 5000W), 5.0SMDJ43CA (MDE Semiconductor Inc., 72.1A / 5000W), SMDJ43CA-T7 (Littelfuse Inc., 43.2A / 3000W), SMDJ43CA (Alpha & Omega Semiconductor Inc., 43.3A / 3000W), and SMLJ43CA (Bourns Inc., 43.2A / 3000W). These parts provide enhanced transient protection capability while maintaining voltage compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status	Operating Temperature
SMCJ43CA-13	Diodes Incorporated	43V	47.8V	69.4V	21.6A	1500W	DO-214AB, SMC	Discontinued	-55°C ~ 150°C
SMCJ43CA-13-F	Diodes Incorporated	43V	47.8V	69.4V	21.6A	1500W	DO-214AB, SMC	Active	-55°C ~ 150°C
SMCJ43CA	Meritek	43V	47.8V	69.4V	21.61A	1500W	DO-214AB (SMC)	Active	-55°C ~ 150°C
SMCJ43CA-TP	Micro Commercial Co	43V	47.8V	69.4V	21.7A	1500W	DO-214AB, SMC	Active	-55°C ~ 175°C
5.0SMDJ43CA-T7	Littelfuse Inc.	43V	47.8V	69.4V	72.1A	5000W	DO-214AB, SMC	Active	-65°C ~ 150°C
5.0SMDJ43CA	MDE Semiconductor Inc	43V	47.8V	69.4V	72.1A	5000W	DO-214AB, SMC	Active	-55°C ~ 150°C
SMDJ43CA-T7	Littelfuse Inc.	43V	47.8V	69.4V	43.2A	3000W	DO-214AB, SMC	Active	-65°C ~ 150°C
SMDJ43CA	Alpha & Omega Semiconductor Inc.	43V	47.8V	69.4V	43.3A	3000W	DO-214AB, SMC	Active	-55°C ~ 150°C
SMLJ43CA	Bourns Inc.	43V	47.8V	69.4V	43.2A	3000W	DO-214AB, SMC	Active	-55°C ~ 150°C

Engineering Selection Recommendations

For Direct Replacement (1:1 Electrical and Power Rating Match):

SMCJ43CA-13-F from Diodes Incorporated is the primary direct substitute, offering identical electrical specifications and power rating with active product status and ROHS3 compliance. SMCJ43CA from Meritek provides equivalent performance with high inventory availability (38,400 units) and ROHS3 compliance. SMCJ43CA-TP from Micro Commercial Co extends the operating temperature range to 175°C while maintaining all electrical parameters and offers ROHS3 compliance.

For Enhanced Protection (Higher Power Rating):

When circuit design permits higher transient energy absorption, SMDJ43CA-T7 (Littelfuse Inc.) and SMDJ43CA (Alpha & Omega Semiconductor Inc.) provide 3000W peak pulse power with 43.2–43.3A peak pulse current. The Littelfuse variant extends the lower operating temperature limit to -65°C. For maximum transient suppression capability, 5.0SMDJ43CA-T7 (Littelfuse Inc.) and 5.0SMDJ43CA (MDE Semiconductor Inc.) deliver 5000W peak pulse power with 72.1A peak pulse current, suitable for high-energy transient environments.

All recommended substitutes maintain the 43V reverse standoff voltage, 47.8V minimum breakdown voltage, and 69.4V maximum clamping voltage required for circuit compatibility. All active alternatives carry ROHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can SMCJ43CA-13-F be used as a direct replacement for SMCJ43CA-13?

A: Yes. SMCJ43CA-13-F from Diodes Incorporated is electrically and mechanically identical to the original part, with the primary difference being packaging format (Tape & Reel vs. bulk). Both maintain 43V reverse standoff voltage, 69.4V clamping voltage, 21.6A peak pulse current, and 1500W peak pulse power. The substitute is active and ROHS3 compliant.

Q: What is the difference between direct equivalents and higher-rated alternatives?

A: Direct equivalents (SMCJ43CA-13-F, SMCJ43CA, SMCJ43CA-TP) maintain the original 1500W peak pulse power rating and 21.6–21.7A peak pulse current. Higher-rated alternatives (SMDJ and 5.0SMDJ series) provide 3000W or 5000W peak pulse power with correspondingly higher peak pulse currents (43–72A), enabling suppression of larger transient events while preserving voltage specifications.

Q: Are all substitute parts compatible with the DO-214AB (SMC) footprint?

A: Yes. All listed substitutes use the DO-214AB (SMC) surface mount package, ensuring mechanical and footprint compatibility with the original SMCJ43CA-13 design.

Q: What compliance certifications apply to the substitute parts?

A: All active substitute parts carry ROHS3 compliance. REACH status varies: most parts are REACH Unaffected or REACH Affected. Verify specific REACH requirements for your application and supply chain.

Q: Can higher-rated alternatives be used in place of the original part?

A: Yes, for upward compatibility. Higher-rated alternatives maintain identical voltage specifications (43V reverse standoff, 69.4V clamping) and package format. The increased peak pulse power and current provide enhanced transient protection without affecting circuit voltage regulation or clamping behavior. No circuit redesign is required.

Q: What is the inventory status of substitute parts?

A: SMCJ43CA from Meritek offers the highest inventory (38,400 units). SMLJ43CA from Bourns Inc. provides 12,981 units. SMCJ43CA-13-F from Diodes Incorporated has 9,322 units. Higher-rated alternatives range from 1,384 to 9,230 units depending on manufacturer and packaging.

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