SMCJ18A-13 Transient Voltage Suppressor (TVS) Diode — Equivalent & Substitute Parts

Part Overview

The SMCJ18A-13 is a unidirectional Zener TVS diode manufactured by Diodes Incorporated in DO-214AB (SMC) surface mount package. This component is designed for general-purpose transient voltage suppression with an 18V reverse standoff voltage and 29.2V maximum clamping voltage at peak pulse current of 51.4A. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMCJ18A-13
Manufacturer	Diodes Incorporated
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
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
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 150°C (TJ)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the SMCJ18A-13 are grouped based on strict electrical and mechanical parameter matching. The critical parameters that determine substitutability are:

Voltage - Reverse Standoff: 18V (Typ)
Voltage - Breakdown: 20V (Min)
Voltage - Clamping: 29.2V (Max) @ Ipp
Current - Peak Pulse: 51.4A (10/1000µs)
Power - Peak Pulse: 1500W
Package / Case: DO-214AB, SMC
Unidirectional Channels: 1
Mounting Type: Surface Mount

Substitute parts are divided into two categories:

Category 1: Direct Electrical Equivalents (1500W Peak Pulse Power) Parts with identical electrical specifications and 1500W peak pulse power rating. These include SMCJ18A-13-F (Diodes Incorporated), MASMCJ18AE3, MSMCJ18AE3, MXLSMCJ18AE3, MXSMCJ18AE3 (Microchip Technology), and TV15C180J-G (Comchip Technology).

Category 2: Higher Power Alternatives (5000W Peak Pulse Power) Parts with identical voltage parameters but higher peak pulse current (172A) and 5000W peak pulse power rating. These include 5.0SMDJ18A (Taiwan Semiconductor Corporation), 5.0SMDJ18A-T7 (Littelfuse Inc.), and SMCJ18A (MDD). These parts provide enhanced transient suppression capability within the same voltage class.

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ)	Vbr (Min)	Vc (Max)	Ipp (A)	Power (W)	Package	Status	RoHS
SMCJ18A-13	Diodes Inc.	18V	20V	29.2V	51.4	1500	DO-214AB	Obsolete	Non-compliant
SMCJ18A-13-F	Diodes Inc.	18V	20V	29.2V	51.4	1500	DO-214AB	Active	ROHS3
MASMCJ18AE3	Microchip	18V	20V	29.2V	51.4	1500	DO-214AB	Active	Non-compliant
MSMCJ18AE3	Microchip	18V	20V	29.2V	51.4	1500	DO-214AB	Active	Non-compliant
MXLSMCJ18AE3	Microchip	18V	20V	29.2V	51.4	1500	DO-214AB	Active	Non-compliant
MXSMCJ18AE3	Microchip	18V	20V	29.2V	51.4	1500	DO-214AB	Active	Non-compliant
TV15C180J-G	Comchip	18V	20V	29.2V	51.37	1500	DO-214AB	Active	ROHS3
5.0SMDJ18A	Taiwan Semi	18V	20V	29.2V	172	5000	DO-214AB	Active	ROHS3
5.0SMDJ18A-T7	Littelfuse	18V	20V	29.2V	172	5000	DO-214AB	Active	ROHS3
SMCJ18A	MDD	18V	20V	29.2V	51.4	1500	DO-214AB	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): SMCJ18A-13-F from Diodes Incorporated is the primary direct substitute. It maintains identical electrical specifications while offering active product status and ROHS3 compliance, addressing the obsolescence of the original part.

For Active Product Status with Equivalent Performance: SMCJ18A from MDD provides identical electrical specifications with active status and ROHS3 compliance. Microchip Technology options (MASMCJ18AE3, MSMCJ18AE3, MXLSMCJ18AE3, MXSMCJ18AE3) offer military-grade qualification (MIL-PRF-19500) and extended temperature range (-65°C to 150°C), suitable for applications requiring enhanced reliability.

For Enhanced Transient Protection: 5.0SMDJ18A (Taiwan Semiconductor Corporation) and 5.0SMDJ18A-T7 (Littelfuse Inc.) provide higher peak pulse current (172A) and 5000W peak pulse power within the same voltage class. These are suitable for applications requiring greater transient energy absorption while maintaining voltage regulation at 18V standoff.

For RoHS3 Compliance: SMCJ18A-13-F, TV15C180J-G, 5.0SMDJ18A, 5.0SMDJ18A-T7, and SMCJ18A all meet ROHS3 compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can SMCJ18A-13-F be used as a direct replacement for SMCJ18A-13? A: Yes. SMCJ18A-13-F maintains identical electrical specifications (18V standoff, 29.2V clamping, 51.4A peak pulse current, 1500W power) and package (DO-214AB). The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between 1500W and 5000W TVS diodes in this voltage class? A: Both maintain the same voltage parameters (18V standoff, 29.2V clamping). The 5000W variants (5.0SMDJ18A series) handle higher peak pulse current (172A vs. 51.4A), providing greater transient energy absorption. Selection depends on the magnitude of transient events in the application.

Q: Are Microchip military-grade parts (MASMCJ18AE3, MSMCJ18AE3, etc.) interchangeable with standard commercial parts? A: Electrically, yes. All maintain identical voltage and current specifications. Microchip military variants include MIL-PRF-19500 qualification and extended temperature range (-65°C to 150°C vs. -55°C to 150°C). Use military-grade parts when application requirements specify military qualification or extended temperature operation.

Q: Does package type affect substitutability? A: All listed substitutes use DO-214AB (SMC) surface mount package. Packaging format (bulk vs. tape & reel) does not affect electrical performance but may impact procurement and assembly processes.

Q: Which substitute offers the best compliance profile? A: SMCJ18A-13-F, TV15C180J-G, 5.0SMDJ18A, 5.0SMDJ18A-T7, and SMCJ18A all meet ROHS3 compliance. SMCJ18A-13-F is the closest match to the original part with active status and modern compliance.

Q: Can I use a higher power rated TVS diode (5000W) in place of a 1500W part? A: Yes, if the application circuit can accommodate the different peak pulse current rating (172A vs. 51.4A). Higher power variants provide enhanced protection margin but do not alter voltage regulation characteristics. Verify circuit design compatibility before substitution.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message