SMAJ24C-E3/61 Equivalent & Substitute Parts

Part Overview

The SMAJ24C-E3/61 is a 24V Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, housed in a DO-214AC (SMA) surface mount package. This component is designed for general-purpose transient voltage protection applications with a 24V reverse standoff voltage and 43V maximum clamping voltage at peak pulse current.

The SMAJ24C-E3/61 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified parameter ranges while meeting the same mechanical and environmental requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	26.7	V
Voltage - Clamping (Max) @ Ipp	43	V
Current - Peak Pulse (10/1000µs)	9.3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMAJ24C-E3/61 are grouped based on electrical parameter compatibility within the following criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 24V
Voltage - Breakdown (Min): 26.7V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Operating Temperature Range: Minimum -55°C to 150°C
RoHS Status: ROHS3 Compliant

Acceptable Parameter Variation:

Voltage - Clamping (Max) @ Ipp: 38.9V to 50V (within circuit protection requirements)
Current - Peak Pulse (10/1000µs): 9.3A to 46A (higher current capability acceptable)
Power - Peak Pulse: 400W to 500W (higher power rating acceptable)

Parts are classified into two groups: direct electrical equivalents with identical clamping voltage (43V) and functional substitutes with alternative clamping voltages (38.9V or 50V) that maintain the same reverse standoff and breakdown voltage specifications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status
SMAJ24C-E3/61	Vishay General Semiconductor	24V	26.7V	43V	9.3A	400W	-55 to 150°C	Obsolete
SMAJ24CA-E3/61	Vishay General Semiconductor	24V	26.7V	38.9V	10.3A	400W	-55 to 150°C	Active
SMAJ24CE3/TR13	Microchip Technology	24V	26.7V	43V	11.6A	500W	-65 to 150°C	Active
SZ1SMA24CAT3G	Littelfuse Inc.	24V	26.7V	38.9V	10.3A	400W	-65 to 150°C	Active
SMAJ24CA-13-F	Diodes Incorporated	24V	26.7V	38.9V	10.3A	400W	-55 to 150°C	Active
SMAJ24CA-TR	STMicroelectronics	24V	26.7V	50V	46A (8/20µs)	400W	-55 to 150°C	Active
SM4T28CAY	STMicroelectronics	24V	26.7V	50V	46A (8/20µs)	400W	-55 to 150°C	Active
SMAJ24CA	MDD	24V	26.7V	38.9V	10.3A	400W	-50 to 150°C	Active
TV04A240JB-G	Comchip Technology	24V	26.7V	38.9V	10.28A	400W	-55 to 150°C	Active

Engineering Selection Recommendations

Direct Electrical Equivalent (Identical Clamping Voltage):

SMAJ24CE3/TR13 (Microchip Technology) is the primary direct equivalent. It maintains the 43V clamping voltage of the original part while offering improved specifications: higher peak pulse current (11.6A vs. 9.3A), increased power rating (500W vs. 400W), and extended lower operating temperature limit (-65°C vs. -55°C). Product status is active with full availability.

Primary Functional Substitutes (38.9V Clamping Voltage):

SMAJ24CA-E3/61 (Vishay General Semiconductor), SZ1SMA24CAT3G (Littelfuse Inc.), SMAJ24CA-13-F (Diodes Incorporated), SMAJ24CA (MDD), and TV04A240JB-G (Comchip Technology) are functionally equivalent with 38.9V clamping voltage. All maintain the 24V reverse standoff and 26.7V breakdown voltage. These parts are suitable for applications where the lower clamping voltage is acceptable. SMAJ24CA-E3/61 is the Vishay equivalent within the same manufacturer family. SZ1SMA24CAT3G and SMAJ24CA-13-F offer extended temperature ranges (-65°C and -55°C respectively).

Alternative Substitute (50V Clamping Voltage):

SMAJ24CA-TR and SM4T28CAY (both STMicroelectronics) provide higher clamping voltage (50V) with significantly increased peak pulse current capability (46A at 8/20µs). These parts are suitable for applications requiring higher transient energy absorption. Both are active products with automotive-grade qualification (AEC-Q101).

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. SZ1SMA24CAT3G carries REACH Affected status, while all other substitutes are REACH Unaffected. SM4T28CAY and SZ1SMA24CAT3G include automotive-grade qualification (AEC-Q101), suitable for automotive and industrial applications.

Frequently Asked Questions (FAQ)

Q: Can SMAJ24CA-E3/61 directly replace SMAJ24C-E3/61?

A: Yes. SMAJ24CA-E3/61 is the active equivalent from Vishay General Semiconductor. It maintains identical reverse standoff (24V) and breakdown voltage (26.7V) specifications. The clamping voltage is lower (38.9V vs. 43V), which is acceptable in most applications. Higher peak pulse current (10.3A vs. 9.3A) provides improved transient handling.

Q: What is the difference between 38.9V and 43V clamping voltage substitutes?

A: Clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit during a transient event. Lower clamping voltage (38.9V) provides tighter voltage regulation but may be unsuitable for circuits requiring the original 43V specification. Higher clamping voltage (50V) allows greater voltage transients but provides less restrictive protection. Selection depends on circuit protection requirements.

Q: Are the STMicroelectronics parts (SMAJ24CA-TR, SM4T28CAY) suitable replacements?

A: Yes, with considerations. Both maintain the 24V reverse standoff and 26.7V breakdown voltage. The 50V clamping voltage is higher than the original 43V, and peak pulse current is significantly higher (46A vs. 9.3A). These parts are suitable for applications requiring higher transient energy absorption. Automotive-grade qualification (AEC-Q101) makes them suitable for automotive and industrial environments.

Q: Does operating temperature range affect substitution?

A: Operating temperature range must meet or exceed the original specification. SMAJ24C-E3/61 operates from -55°C to 150°C. Substitutes with -50°C lower limit (SMAJ24CA from MDD) are acceptable for most applications but may not be suitable for extreme cold environments. Substitutes with -65°C lower limit (SMAJ24CE3/TR13, SZ1SMA24CAT3G) provide extended temperature coverage.

Q: What packaging considerations apply to these substitutes?

A: All substitute parts use DO-214AC (SMA) surface mount package, identical to the original SMAJ24C-E3/61. Mechanical compatibility is maintained across all listed substitutes. Tape & Reel (TR) and Cut Tape (CT) packaging options are available from various manufacturers for production requirements.

Q: Are there compliance or certification differences between substitutes?

A: All substitutes maintain ROHS3 compliance and MSL 1 rating. SZ1SMA24CAT3G is REACH Affected; all others are REACH Unaffected. SM4T28CAY and SZ1SMA24CAT3G include AEC-Q101 automotive qualification, suitable for automotive applications. Standard industrial applications can use any listed substitute.

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