SMAJ24CA-13 Equivalent & Substitute Parts

Part Overview

The SMAJ24CA-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 24V reverse standoff voltage with a 38.9V maximum clamping voltage and 10.3A peak pulse current capability in a DO-214AC (SMA) package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	24V
Breakdown Voltage (Min)	26.7V
Clamping Voltage (Max) @ Ipp	38.9V
Peak Pulse Current (10/1000µs)	10.3A
Peak Pulse Power	400W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Bidirectional Channels	1
Type	Zener

Substitute Part Grouping Explanation

Substitute parts for the SMAJ24CA-13 are grouped based on strict electrical and mechanical compatibility criteria. All qualified substitutes maintain the following core parameters:

Reverse standoff voltage: 24V
Breakdown voltage minimum: 26.7V
Package: DO-214AC (SMA)
Mounting type: Surface Mount
Bidirectional channels: 1
Type: Zener

Substitutes are categorized into two groups:

Group 1: Direct Electrical Equivalents — Parts with identical clamping voltage (38.9V), peak pulse current (10.3A), and peak pulse power (400W). These provide one-to-one functional replacement.

Group 2: Enhanced Performance Alternatives — Parts with the same standoff and breakdown voltages but higher clamping voltage, peak pulse current, or power ratings. These offer improved transient suppression capability while maintaining voltage protection thresholds.

Parameter Comparison

Part Number	Manufacturer	Standoff Voltage	Breakdown Voltage (Min)	Clamping Voltage (Max)	Peak Pulse Current	Peak Pulse Power	Operating Temperature	Product Status	RoHS Status
SMAJ24CA-13	Diodes Incorporated	24V	26.7V	38.9V	10.3A	400W	-55°C ~ 150°C	Obsolete	Non-compliant
SMAJ24CA-13-F	Diodes Incorporated	24V	26.7V	38.9V	10.3A	400W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMAJ24CA	MDD	24V	26.7V	38.9V	10.3A	400W	-50°C ~ 150°C	Active	ROHS3 Compliant
TV04A240JB-G	Comchip Technology	24V	26.7V	38.9V	10.28A	400W	-55°C ~ 150°C	Active	ROHS3 Compliant
P4SMAJ24CA_R1_00001	Panjit International Inc.	24V	26.7V	38.9V	10.3A	400W	-55°C ~ 150°C	Active	ROHS3 Compliant
SM4T28CAY	STMicroelectronics	24V	26.7V	50V	46A (8/20µs)	400W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMA6J24CA-TP	Micro Commercial Co	24V	26.7V	38.9V	15.4A	600W	-55°C ~ 175°C	Active	ROHS3 Compliant
SMA6J24CA-TR	STMicroelectronics	24V	26.7V	44.3V	80A (8/20µs)	600W	-55°C ~ 175°C	Active	ROHS3 Compliant
SMAJ24CA-TP	Micro Commercial Co	24V	26.7V	38.9V	10.3A	400W	-55°C ~ 175°C	Active	ROHS3 Compliant
SMAJ24CA-TR	STMicroelectronics	24V	26.7V	50V	46A (8/20µs)	400W	-55°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SMAJ24CA-13-F (Diodes Incorporated)

This part is the direct successor to the obsolete SMAJ24CA-13, maintaining identical electrical specifications while offering active product status and ROHS3 compliance. It is the preferred choice for direct replacement in existing designs.

Secondary Recommendations:

SMAJ24CA-TP (Micro Commercial Co) and P4SMAJ24CA_R1_00001 (Panjit International Inc.) provide equivalent electrical performance with extended operating temperature ranges (-55°C ~ 175°C) and active status. Both are ROHS3 compliant and suitable for applications requiring higher temperature operation.

Enhanced Performance Alternatives:

SMA6J24CA-TP (Micro Commercial Co) and SMA6J24CA-TR (STMicroelectronics) offer increased peak pulse current and power dissipation (15.4A / 600W and 80A / 600W respectively) while maintaining the 24V standoff voltage. These are appropriate for applications requiring higher transient energy absorption.

SM4T28CAY (STMicroelectronics) and SMAJ24CA-TR (STMicroelectronics) provide higher clamping voltages (50V and 50V respectively) with significantly increased peak pulse current ratings. These are suitable for applications requiring enhanced overvoltage margin.

All recommended substitutes are ROHS3 compliant and carry active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can SMAJ24CA-13-F be used as a direct replacement for SMAJ24CA-13?

A: Yes. SMAJ24CA-13-F maintains identical electrical parameters (24V standoff, 38.9V clamping, 10.3A peak pulse current, 400W power) and the same DO-214AC (SMA) package. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 compliant vs. non-compliant).

Q: What is the difference between Group 1 and Group 2 substitutes?

A: Group 1 substitutes (SMAJ24CA-13-F, SMAJ24CA, TV04A240JB-G, P4SMAJ24CA_R1_00001, SMAJ24CA-TP) provide identical clamping voltage and peak pulse current specifications. Group 2 alternatives (SM4T28CAY, SMA6J24CA-TP, SMA6J24CA-TR, SMAJ24CA-TR) offer enhanced performance with higher clamping voltages or peak pulse currents while maintaining the same 24V standoff voltage.

Q: Are all substitutes available in the same package?

A: Yes. All listed substitutes use the DO-214AC (SMA) surface-mount package, ensuring mechanical and footprint compatibility with the original SMAJ24CA-13 design.

Q: Which substitute offers the best long-term availability?

A: SMAJ24CA-13-F (Diodes Incorporated) is the recommended choice for long-term availability, as it is the direct active successor to the obsolete SMAJ24CA-13 with identical specifications and established supply chain presence.

Q: Can I use a higher-rated substitute (Group 2) in place of the original part?

A: Yes, provided the application circuit can accommodate the different electrical characteristics. Enhanced performance alternatives maintain the 24V standoff and 26.7V minimum breakdown voltages, ensuring voltage protection thresholds remain consistent. Higher clamping voltages or peak pulse currents will not negatively affect circuit operation in standard transient suppression applications.

Q: What is the operating temperature difference between substitutes?

A: The original SMAJ24CA-13 operates from -55°C to 150°C (TJ). Some substitutes extend this range to -55°C to 175°C (TA or TJ), providing improved performance in high-temperature environments. The MDD SMAJ24CA variant operates from -50°C to 150°C, which is slightly narrower at the lower end.

Q: Are all substitutes RoHS compliant?

A: The original SMAJ24CA-13 is RoHS non-compliant. All listed substitutes are ROHS3 compliant, meeting current regulatory requirements for new designs and procurement.

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