SMCJ18CA-13 Equivalent & Substitute Parts

Part Overview

The SMCJ18CA-13 is a transient voltage suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode features an 18V reverse standoff voltage with a 29.2V maximum clamping voltage and 51.4A peak pulse current capability in a DO-214AB (SMC) package.

The SMCJ18CA-13 is discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers with identical or enhanced electrical characteristics, offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	18V
Voltage - Breakdown (Min)	20V
Voltage - Clamping (Max) @ Ipp	29.2V
Current - Peak Pulse (10/1000µs)	51.4A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Type	Zener
Bidirectional Channels	1

Substitute Part Grouping Explanation

Substitute parts for the SMCJ18CA-13 are categorized based on electrical parameter compatibility and packaging equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - Reverse Standoff: 18V (exact match required)
Voltage - Breakdown (Min): 20V (exact match required)
Voltage - Clamping (Max) @ Ipp: 29.2V (exact match required)
Package / Case: DO-214AB, SMC (exact match required)
Mounting Type: Surface Mount (exact match required)
Bidirectional Channels: 1 (exact match required)

Allowable Variations:

Current - Peak Pulse (10/1000µs): May exceed 51.4A (higher current capability is acceptable)
Power - Peak Pulse: May exceed 1500W (higher power rating is acceptable)
Operating Temperature Range: May extend beyond -55°C ~ 150°C (wider range is acceptable)
Packaging Format: Cut Tape, Tape & Reel, or Digi-Reel formats are interchangeable
RoHS Compliance: ROHS3 Compliant variants are preferred over non-compliant originals

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ)	Vbr (Min)	Vc (Max)	Ipp (A)	Ppk (W)	Package	Temp Range	Status	RoHS
SMCJ18CA-13	Diodes Inc.	18V	20V	29.2V	51.4A	1500W	DO-214AB	-55 to 150°C	Discontinued	Non-compliant
SMCJ18CA-13-F	Diodes Inc.	18V	20V	29.2V	51.4A	1500W	DO-214AB	-55 to 150°C	Active	ROHS3
SMCJ18CA	EVVO Semi	18V	20V	29.2V	51.4A	1500W	DO-214AB	-55 to 150°C	Active	ROHS3
SMCJ18CA-TP	Micro Commercial Co	18V	20V	29.2V	51.4A	1500W	DO-214AB	-55 to 175°C	Active	ROHS3
5.0SMDJ18CA	MDE Semiconductor	18V	20V	29.2V	172A	5000W	DO-214AB	-55 to 150°C	Active	ROHS3
5.0SMDJ18CA-T7	Littelfuse Inc.	18V	20V	29.2V	172A	5000W	DO-214AB	-65 to 150°C	Active	ROHS3
SMCJ18CA-TR	STMicroelectronics	18V	20V	39.3V	254A	1500W	DO-214AB	-55 to 150°C	Active	ROHS3
SMDJ18CA	Alpha & Omega Semi	18V	20V	29.2V	102.8A	3000W	DO-214AB	-55 to 150°C	Active	ROHS3
SMDJ18CA-T7	Littelfuse Inc.	18V	20V	29.2V	102.7A	3000W	DO-214AB	-65 to 150°C	Active	ROHS3

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Voltage and Current Ratings):

SMCJ18CA-13-F (Diodes Incorporated) is the primary direct replacement. It maintains identical electrical specifications while offering active product status and ROHS3 compliance. SMCJ18CA (EVVO Semi) provides equivalent performance with higher inventory availability.

Enhanced Performance Alternatives (Higher Current/Power Ratings):

5.0SMDJ18CA and 5.0SMDJ18CA-T7 offer 172A peak pulse current and 5000W peak power, providing superior transient protection margin. These are suitable for applications requiring enhanced overvoltage suppression capability while maintaining the same voltage thresholds.

SMDJ18CA and SMDJ18CA-T7 provide intermediate performance with 102.8A and 102.7A peak pulse current respectively, and 3000W peak power rating.

Extended Temperature Range Option:

SMCJ18CA-TP (Micro Commercial Co) extends the operating temperature range to -55°C ~ 175°C, suitable for high-temperature environments.

Note on STMicroelectronics SMCJ18CA-TR:

This part exhibits a higher clamping voltage (39.3V) and peak pulse current (254A) compared to the original specification. Selection requires confirmation that the elevated clamping voltage is acceptable for the target application.

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can SMCJ18CA-13-F be used as a direct replacement for SMCJ18CA-13?

A: Yes. SMCJ18CA-13-F is electrically and mechanically identical to SMCJ18CA-13, with the primary difference being active product status and ROHS3 compliance certification. Both use the DO-214AB (SMC) package and share identical voltage and current ratings.

Q: What is the difference between SMCJ18CA-13 and SMDJ18CA?

A: Both maintain identical voltage specifications (18V standoff, 20V breakdown, 29.2V clamping). The primary difference is peak pulse current: SMCJ18CA-13 is rated at 51.4A, while SMDJ18CA is rated at 102.8A. SMDJ18CA provides higher transient current handling capability and 3000W peak power versus 1500W. Both use the DO-214AB package.

Q: Are the 5.0SMDJ series parts compatible with SMCJ18CA-13 applications?

A: The 5.0SMDJ18CA and 5.0SMDJ18CA-T7 maintain identical voltage thresholds but offer significantly higher current (172A) and power (5000W) ratings. They are mechanically compatible (DO-214AB package) and electrically compatible for voltage protection. Selection depends on whether the application requires the enhanced current handling capability.

Q: What packaging formats are available for SMCJ18CA-13 substitutes?

A: Substitutes are available in Cut Tape (CT), Digi-Reel, and Tape & Reel (TR) formats. All formats are compatible for PCB assembly; selection depends on production volume and assembly equipment requirements.

Q: Why does SMCJ18CA-TR show a higher clamping voltage (39.3V)?

A: SMCJ18CA-TR from STMicroelectronics exhibits different transient response characteristics, resulting in a higher measured clamping voltage at peak pulse current. The reverse standoff and breakdown voltages remain at 18V and 20V respectively. This part is suitable only if the application can tolerate the elevated clamping voltage.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original SMCJ18CA-13 is non-compliant; ROHS3-compliant variants are preferred for new designs and long-term supply assurance.

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