SMCJ120CA-13 Equivalent & Substitute Parts

Part Overview

The SMCJ120CA-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 120V reverse standoff voltage with a 193V maximum clamping voltage and 7.9A 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)	120	V
Voltage - Breakdown (Min)	133	V
Voltage - Clamping (Max) @ Ipp	193	V
Current - Peak Pulse (10/1000µs)	7.9	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	—

Substitute Part Grouping Explanation

Substitution of the SMCJ120CA-13 is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 120V
Voltage - Breakdown (Min): 133V
Voltage - Clamping (Max) @ Ipp: 193V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener, Bidirectional (1 channel)

Substitute parts are grouped into two categories based on peak pulse current and power dissipation capacity:

Category A (Direct Electrical Equivalents): Parts with 7.8–7.9A peak pulse current and 1500W power rating. These provide identical electrical performance and are pin-for-pin compatible.

Category B (Higher Performance Alternatives): Parts with 15.6–26A peak pulse current and 3000–5000W power rating. These exceed the original specification and provide enhanced transient protection capability while maintaining voltage parameters and package compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Product Status	Package
SMCJ120CA-13	Diodes Incorporated	120	133	193	7.9	1500	-55 to 150	Discontinued	DO-214AB, SMC
SMCJ120CA	Fairchild Semiconductor	120	133	193	7.9	1500	-55 to 150	Active	DO-214AB, SMC
SMCJ120CA-TP	Micro Commercial Co	120	133	193	7.8	1500	-55 to 175	Active	DO-214AB, SMC
SMDJ120CA	Alpha & Omega Semiconductor Inc.	120	133	193	15.6	3000	-55 to 150	Active	DO-214AB, SMC
SMLJ120CA	Bourns Inc.	120	133	193	15.6	3000	-55 to 150	Active	DO-214AB, SMC
5.0SMDJ120CA	MDE Semiconductor Inc	120	133	193	26	5000	-55 to 150	Active	DO-214AB, SMC
5.0SMDJ120CA-T7	Littelfuse Inc.	120	133	193	26	5000	-65 to 150	Active	DO-214AB, SMC

Engineering Selection Recommendations

Direct Replacement (Identical Specifications):

SMCJ120CA (Fairchild Semiconductor) and SMCJ120CA-TP (Micro Commercial Co) are direct electrical and mechanical equivalents to the SMCJ120CA-13. Both maintain the 7.8–7.9A peak pulse current and 1500W power dissipation. SMCJ120CA-TP offers an extended operating temperature range (-55 to 175°C) and is RoHS3 compliant. SMCJ120CA is available in bulk packaging with higher inventory levels.

Higher Performance Alternatives:

SMDJ120CA (Alpha & Omega Semiconductor Inc.) and SMLJ120CA (Bourns Inc.) provide 15.6A peak pulse current and 3000W power dissipation while maintaining identical voltage parameters and package compatibility. These are suitable for applications requiring enhanced transient suppression margin.

5.0SMDJ120CA (MDE Semiconductor Inc) and 5.0SMDJ120CA-T7 (Littelfuse Inc.) deliver the highest performance with 26A peak pulse current and 5000W power dissipation. The Littelfuse variant extends the lower operating temperature limit to -65°C and is RoHS3 compliant.

All substitute parts are active products with confirmed inventory availability and maintain the DO-214AB (SMC) surface-mount package format.

Frequently Asked Questions (FAQ)

Q: Can SMCJ120CA-13 be replaced with SMCJ120CA?

A: Yes. SMCJ120CA from Fairchild Semiconductor is a direct equivalent with identical voltage ratings (120V standoff, 193V clamping), peak pulse current (7.9A), and power dissipation (1500W). Both use the DO-214AB (SMC) package and are pin-for-pin compatible.

Q: What is the difference between the 1500W and 3000W variants?

A: The 1500W variants (SMCJ120CA, SMCJ120CA-TP) handle 7.8–7.9A peak pulse current. The 3000W variants (SMDJ120CA, SMLJ120CA) handle 15.6A peak pulse current. Both maintain identical voltage clamping characteristics (193V maximum). Selection depends on transient current magnitude in the application.

Q: Are higher-power alternatives (5000W) compatible with the original design?

A: Yes. The 5.0SMDJ120CA and 5.0SMDJ120CA-T7 maintain all voltage parameters (120V standoff, 193V clamping) and use the same DO-214AB (SMC) package. They provide enhanced protection capability with 26A peak pulse current and 5000W dissipation. No circuit modifications are required for substitution.

Q: What packaging options are available?

A: All substitute parts are available in surface-mount DO-214AB (SMC) package format. SMCJ120CA is supplied in bulk packaging. SMCJ120CA-TP, 5.0SMDJ120CA, 5.0SMDJ120CA-T7, and SMLJ120CA are supplied in Tape & Reel (TR) format.

Q: Which substitute offers the widest operating temperature range?

A: SMCJ120CA-TP (Micro Commercial Co) operates from -55 to 175°C, providing the highest upper temperature limit. 5.0SMDJ120CA-T7 (Littelfuse Inc.) extends the lower limit to -65°C while maintaining the 150°C upper limit.

Q: Are all substitutes RoHS compliant?

A: SMCJ120CA (Fairchild Semiconductor) does not specify RoHS status. SMCJ120CA-TP, SMDJ120CA, SMLJ120CA, 5.0SMDJ120CA, and 5.0SMDJ120CA-T7 are all RoHS3 compliant.

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