SMCJ18CA-M3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ18CA-M3/9AT is a bidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the 18V reverse standoff category and is designed for general-purpose transient protection applications. The part is active in production status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when sourcing from multiple manufacturers is needed to optimize supply chain reliability.

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
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Type	Zener
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SMCJ18CA-M3/9AT is determined by strict alignment of the following critical parameters:

Core Electrical Parameters (Must Match):

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
Type: Zener
Bidirectional Channels: 1

Mechanical & Environmental Parameters (Must Match):

Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Operating Temperature Range: -55°C ~ 150°C (TJ) minimum
RoHS Status: ROHS3 Compliant

Packaging Format (Flexible):

Tape & Reel (TR) or Cut Tape (CT) formats are interchangeable for equivalent functionality

Parts meeting all core electrical and mechanical parameters are classified as direct equivalents. Parts with identical electrical specifications but different peak pulse current ratings or power dissipation are classified as performance variants and noted separately.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max)	Current - Peak Pulse	Power - Peak Pulse	Operating Temp Range	Packaging	Product Status
SMCJ18CA-M3/9AT	Vishay General Semiconductor	18V	29.2V	51.4A	1500W	-55°C ~ 150°C	Tape & Reel	Active
SMCJ18CA-E3/57T	Vishay General Semiconductor	18V	29.2V	51.4A	1500W	-55°C ~ 150°C	Tape & Reel	Active
SMCJ18CA	EVVO Semi	18V	29.2V	51.4A	1500W	-55°C ~ 150°C	Cut Tape & Digi-Reel	Active
SMCJ18CA-13-F	Diodes Incorporated	18V	29.2V	51.4A	1500W	-55°C ~ 150°C	Tape & Reel	Active
SMCJ18CA-TP	Micro Commercial Co	18V	29.2V	51.4A	1500W	-55°C ~ 175°C	Tape & Reel	Active
5.0SMDJ18CA	MDE Semiconductor Inc	18V	29.2V	172A	5000W	-55°C ~ 150°C	Tape & Reel	Active
SMCJ18CA-TR	STMicroelectronics	18V	39.3V	254A (8/20µs)	1500W	-55°C ~ 150°C	Tape & Reel	Active
SMDJ18CA	Alpha & Omega Semiconductor Inc.	18V	29.2V	102.8A	3000W	-55°C ~ 150°C	Tape & Reel	Active
SMLJ18CA-TP	Micro Commercial Co	18V	29.2V	102.8A	3000W	-55°C ~ 175°C	Cut Tape	Active

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical & Mechanical Specifications):

The following parts are direct equivalents to SMCJ18CA-M3/9AT and can be substituted without circuit redesign:

SMCJ18CA-E3/57T (Vishay General Semiconductor - Diodes Division)
SMCJ18CA (EVVO Semi)
SMCJ18CA-13-F (Diodes Incorporated)
SMCJ18CA-TP (Micro Commercial Co) — Extended operating temperature range to -55°C ~ 175°C

All direct equivalents maintain identical voltage ratings (18V reverse standoff, 29.2V clamping), peak pulse current (51.4A), and power dissipation (1500W). All are RoHS3 compliant with MSL 1 rating.

Performance Variants (Higher Current/Power Ratings):

The following parts share identical voltage specifications but provide enhanced current handling and power dissipation:

SMDJ18CA (Alpha & Omega Semiconductor Inc.) — 102.8A peak pulse, 3000W power
SMLJ18CA-TP (Micro Commercial Co) — 102.8A peak pulse, 3000W power, extended temperature range to -55°C ~ 175°C
5.0SMDJ18CA (MDE Semiconductor Inc.) — 172A peak pulse, 5000W power

These variants are suitable for applications requiring higher transient energy absorption while maintaining the same voltage protection threshold.

Specification Deviation (Not Recommended for Direct Substitution):

SMCJ18CA-TR (STMicroelectronics) — Clamping voltage 39.3V (vs. 29.2V), peak pulse current 254A (8/20µs). This part operates at a higher clamping voltage and is not a direct equivalent.

All recommended parts maintain active production status and full RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can SMCJ18CA-E3/57T replace SMCJ18CA-M3/9AT directly?

A: Yes. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications: 18V reverse standoff, 29.2V clamping voltage, 51.4A peak pulse current, and 1500W power dissipation. Both are packaged in DO-214AB (SMC) format with Tape & Reel packaging. No circuit modifications are required.

Q: What is the difference between SMCJ18CA and SMCJ18CA-TP?

A: SMCJ18CA (EVVO Semi) is supplied in Cut Tape & Digi-Reel format, while SMCJ18CA-TP (Micro Commercial Co) is supplied in Tape & Reel format. Electrically and mechanically, both are identical. SMCJ18CA-TP offers an extended operating temperature range to -55°C ~ 175°C compared to -55°C ~ 150°C for the base specification. Selection depends on packaging requirements and temperature environment.

Q: Can SMDJ18CA be used instead of SMCJ18CA-M3/9AT?

A: SMDJ18CA shares the same voltage protection characteristics (18V reverse standoff, 29.2V clamping) but provides higher current handling (102.8A vs. 51.4A) and power dissipation (3000W vs. 1500W). It is suitable for applications requiring greater transient energy absorption. The part is electrically compatible but represents a performance upgrade rather than a direct equivalent.

Q: Why is SMCJ18CA-TR listed as a variant rather than a direct equivalent?

A: SMCJ18CA-TR (STMicroelectronics) has a clamping voltage of 39.3V, which exceeds the 29.2V specification of SMCJ18CA-M3/9AT. This higher clamping voltage may affect circuit protection characteristics and is not suitable for direct substitution without circuit analysis.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL 1 (unlimited) moisture sensitivity level, consistent with the original SMCJ18CA-M3/9AT specification.

Q: What packaging formats are available for equivalent parts?

A: Direct equivalents are available in Tape & Reel (TR) and Cut Tape (CT) formats. Both formats contain identical components and differ only in supply method. Selection depends on assembly line requirements and order quantities.

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