SMCJ45CA-13 Equivalent & Substitute Parts

Part Overview

The SMCJ45CA-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 45V reverse standoff voltage with a 72.7V maximum clamping voltage and 20.6A peak pulse current capability in a DO-214AB (SMC) package.

The SMCJ45CA-13 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers with identical or enhanced electrical specifications, ensuring design continuity and supply chain flexibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	45	V
Voltage - Breakdown (Min)	50	V
Voltage - Clamping (Max) @ Ipp	72.7	V
Current - Peak Pulse (10/1000µs)	20.6	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

Substitute parts for the SMCJ45CA-13 are classified based on electrical parameter compatibility and product availability status. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - Reverse Standoff (Typ): 45V
Voltage - Clamping (Max) @ Ipp: 72.7V
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener, Bidirectional

Substitution Categories:

Direct Equivalents maintain identical electrical specifications and package configuration. These parts are pin-compatible and functionally interchangeable without circuit modification.

Enhanced Substitutes provide higher peak pulse current ratings (68.8A or 41.3A versus 20.6A) and increased power dissipation capability (3000W to 5000W versus 1500W). These parts meet or exceed the original specifications and are suitable for applications requiring additional margin or higher transient energy absorption.

Packaging Variants include different tape and reel configurations (Cut Tape, Digi-Reel, standard Tape & Reel) suitable for different assembly processes. All maintain identical electrical and mechanical compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Product Status	RoHS Status
SMCJ45CA-13	Diodes Incorporated	45	72.7	20.6	1500	-55 to 150	Discontinued	Non-compliant
SMCJ45CA-13-F	Diodes Incorporated	45	72.7	20.6	1500	-55 to 150	Active	ROHS3 Compliant
SMCJ45CA	MDD	45	72.7	20.6	1500	-50 to 150	Active	ROHS3 Compliant
SMCJ45CA-TP	Micro Commercial Co	45	72.7	20.6	1500	-55 to 175	Active	ROHS3 Compliant
5.0SMDJ45CA	MDE Semiconductor Inc	45	72.7	68.8	5000	-55 to 150	Active	ROHS3 Compliant
5.0SMDJ45CA-T7	Littelfuse Inc.	45	72.7	68.8	5000	-65 to 150	Active	ROHS3 Compliant
SMDJ45CA	Alpha & Omega Semiconductor Inc.	45	72.7	41.3	3000	-55 to 150	Active	ROHS3 Compliant
SMLJ45CA	Bourns Inc.	45	72.7	41.2	3000	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

SMCJ45CA-13-F (Diodes Incorporated) is the primary direct replacement. It maintains all electrical parameters of the original part while offering active product status and ROHS3 compliance. This part is recommended for designs requiring no circuit modification.

SMCJ45CA (MDD) provides direct electrical equivalence with active availability. The operating temperature range extends to -50°C minimum (versus -55°C), which is acceptable for most applications. ROHS3 compliance is confirmed.

SMCJ45CA-TP (Micro Commercial Co) offers the widest operating temperature range (-55°C to 175°C) among direct equivalents, providing additional thermal margin for high-temperature environments. ROHS3 compliant with active status.

For Enhanced Performance (Higher Current/Power Rating):

5.0SMDJ45CA (MDE Semiconductor Inc) and 5.0SMDJ45CA-T7 (Littelfuse Inc.) provide 68.8A peak pulse current and 5000W power dissipation, representing 3.3× the current handling and 3.3× the power capability of the original part. These are suitable for applications requiring additional transient energy absorption margin. Both are ROHS3 compliant and active.

SMDJ45CA (Alpha & Omega Semiconductor Inc.) and SMLJ45CA (Bourns Inc.) offer intermediate performance with 41.2–41.3A peak pulse current and 3000W power dissipation (2× the original specifications). These provide a balanced upgrade path with maintained package compatibility.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The original SMCJ45CA-13 is RoHS non-compliant; migration to any substitute part improves compliance posture.

Frequently Asked Questions (FAQ)

Q: Can SMCJ45CA-13-F be used as a direct drop-in replacement for SMCJ45CA-13?

A: Yes. SMCJ45CA-13-F maintains identical electrical specifications (45V standoff, 72.7V clamping, 20.6A peak pulse) and package configuration (DO-214AB, SMC). The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 versus non-compliant). No circuit modification is required.

Q: What is the difference between direct equivalents and enhanced substitutes?

A: Direct equivalents (SMCJ45CA-13-F, SMCJ45CA, SMCJ45CA-TP) maintain the original 20.6A peak pulse current and 1500W power rating. Enhanced substitutes (5.0SMDJ45CA, 5.0SMDJ45CA-T7, SMDJ45CA, SMLJ45CA) provide higher current ratings (41.2–68.8A) and power dissipation (3000–5000W). Enhanced substitutes are suitable for applications requiring additional transient protection margin but are not required for designs validated with the original part.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the DO-214AB (SMC) package with surface-mount configuration. Tape and reel packaging options vary (Cut Tape, Digi-Reel, standard Tape & Reel) to accommodate different assembly processes, but the physical component footprint and pinout remain identical.

Q: Which substitute part has the widest operating temperature range?

A: SMCJ45CA-TP (Micro Commercial Co) operates from -55°C to 175°C, providing the widest temperature margin. This is beneficial for applications in extreme thermal environments. All other direct equivalents operate to 150°C maximum.

Q: Can enhanced substitutes be used in place of direct equivalents?

A: Yes. Enhanced substitutes (higher current and power ratings) are backward compatible with designs validated for the original 20.6A / 1500W specifications. The higher ratings provide additional protection margin without affecting circuit operation. Pin configuration and voltage characteristics remain identical.

Q: What is the impact of using a substitute part with different peak pulse current rating?

A: Peak pulse current rating determines the maximum transient current the device can safely absorb. Using a part with higher rating (e.g., 68.8A instead of 20.6A) provides additional margin for transient events but does not change the clamping voltage or standoff voltage. The circuit will function identically; the higher-rated part simply offers greater protection headroom.

Q: Are there any compliance differences between substitute parts?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected. The original SMCJ45CA-13 is RoHS non-compliant. Migration to any substitute part improves regulatory compliance for new designs or product revisions.

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