SMAJ24A-13 Equivalent & Substitute Parts

Part Overview

The SMAJ24A-13 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 24V reverse standoff voltage and provides 38.9V maximum clamping voltage at peak pulse current of 10.3A. The SMAJ24A-13 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives with identical or comparable electrical characteristics are available from multiple manufacturers.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ24A-13 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Reverse Standoff: 24V
Voltage - Breakdown (Min): 26.7V
Package / Case: DO-214AC (SMA) or equivalent surface-mount package
Mounting Type: Surface Mount
Type: Zener, Unidirectional

Secondary Compatibility Parameters:

Voltage - Clamping (Max) @ Ipp: 38.9V (or within acceptable design margin)
Current - Peak Pulse (10/1000µs): 10.3A (or higher capacity acceptable)
Power - Peak Pulse: 400W (or higher capacity acceptable)
Operating Temperature Range: -55°C ~ 150°C minimum

Substitute parts must maintain the same reverse standoff voltage and breakdown voltage specifications to ensure proper circuit protection thresholds. Package compatibility is mandatory for PCB layout and assembly. Parts with higher clamping voltages, peak pulse currents, or power ratings are acceptable as they provide enhanced protection margins without compromising circuit function.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package	Product Status	RoHS Status
SMAJ24A-13	Diodes Incorporated	24V	26.7V	38.9V	10.3A	400W	DO-214AC, SMA	Obsolete	RoHS non-compliant
SMAJ24A-13-F	Diodes Incorporated	24V	26.7V	38.9V	10.3A	400W	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ24A	MDD	24V	26.7V	38.9V	10.3A	400W	DO-214AC, SMA	Active	ROHS3 Compliant
TV04A240J-G	Comchip Technology	24V	26.7V	38.9V	10.28A	400W	DO-214AC, SMA	Active	ROHS3 Compliant
P4SMAJ24A_R1_00001	Panjit International Inc.	24V	26.7V	38.9V	10.3A	400W	DO-214AC, SMA	Active	ROHS3 Compliant
PTVS24VS1UR,115	Nexperia USA Inc.	24V	26.7V	38.9V	10.3A	400W	SOD-123W	Active	ROHS3 Compliant
SM4T28AY	STMicroelectronics	24V	26.7V	50V	46A (8/20µs)	400W	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J24A-E3/5A	Vishay General Semiconductor - Diodes Division	24V	26.7V	44.3V	80A (8/20µs)	4000W	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J24A-E3/61	Vishay General Semiconductor - Diodes Division	24V	26.7V	44.3V	80A (8/20µs)	4000W	DO-214AC, SMA	Active	ROHS3 Compliant
SMA6J24A-TP	Micro Commercial Co	24V	26.7V	38.9V	15.4A	600W	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Specifications):

SMAJ24A-13-F (Diodes Incorporated), SMAJ24A (MDD), TV04A240J-G (Comchip Technology), and P4SMAJ24A_R1_00001 (Panjit International Inc.) provide direct electrical equivalence with matching 24V standoff voltage, 26.7V breakdown voltage, 38.9V clamping voltage, and 10.3A peak pulse current. All are active products with ROHS3 compliance, making them suitable for new designs requiring regulatory compliance. SMAJ24A-13-F is the direct successor from the original manufacturer with identical electrical performance and improved compliance status.

Enhanced Performance Alternatives (Same Package, Higher Ratings):

SMA6J24A-TP (Micro Commercial Co) maintains the DO-214AC (SMA) package with identical clamping voltage (38.9V) but offers increased peak pulse current (15.4A) and power dissipation (600W), providing additional protection margin. Operating temperature extends to 175°C.

SMA6J24A-E3/5A and SMA6J24A-E3/61 (Vishay General Semiconductor) offer significantly higher performance with 44.3V clamping voltage, 80A peak pulse current, and 4000W power dissipation in the same DO-214AC (SMA) package. These are suitable for applications requiring enhanced transient suppression capability.

Alternative Package Option:

PTVS24VS1UR,115 (Nexperia USA Inc.) provides identical electrical specifications in SOD-123W package with AEC-Q101 automotive qualification. This option is applicable only if PCB layout permits SOD-123W footprint substitution.

Higher Clamping Voltage Alternative:

SM4T28AY (STMicroelectronics) maintains 24V standoff voltage but increases clamping voltage to 50V with 46A peak pulse current. This part is suitable only if circuit design tolerates higher clamping voltage and includes AEC-Q101 automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can SMAJ24A-13-F directly replace SMAJ24A-13 without PCB modification?

A: Yes. SMAJ24A-13-F is the active equivalent with identical electrical specifications and DO-214AC (SMA) package. No PCB layout changes are required. The primary difference is improved RoHS3 compliance status.

Q: What is the difference between 10.3A and 10.28A peak pulse current specifications?

A: The 0.02A difference between SMAJ24A-13 (10.3A) and TV04A240J-G (10.28A) is within normal manufacturing tolerance and does not affect circuit compatibility. Both parts meet the same functional requirements.

Q: Can SMA6J24A-E3/5A replace SMAJ24A-13 in existing designs?

A: Electrical substitution is valid because both maintain 24V standoff voltage and 26.7V breakdown voltage. However, the higher clamping voltage (44.3V vs. 38.9V) and significantly higher power rating (4000W vs. 400W) must be evaluated against circuit design margins. PCB layout remains compatible due to identical DO-214AC (SMA) package.

Q: Is PTVS24VS1UR,115 compatible with SMAJ24A-13?

A: Electrical specifications are identical, but the SOD-123W package differs from DO-214AC (SMA). Substitution requires PCB redesign and new footprint layout. This option is applicable only if design flexibility permits package change.

Q: Why does SM4T28AY have higher clamping voltage (50V) than SMAJ24A-13 (38.9V)?

A: SM4T28AY is a higher-performance TVS diode designed for applications requiring greater transient suppression capability. The 50V clamping voltage is acceptable only if circuit design tolerates this higher voltage threshold. Verify that downstream components can withstand this clamping level before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original SMAJ24A-13 is RoHS non-compliant. For new designs and production requiring regulatory compliance, select from active alternatives with ROHS3 status.

Q: What is the operating temperature range difference between SMAJ24A-13 and SMA6J24A-TP?

A: SMAJ24A-13 operates -55°C to 150°C (TJ), while SMA6J24A-TP extends to 175°C (TA). The extended range provides additional thermal margin for high-temperature applications but does not affect substitution validity for standard operating conditions.

Q: Can multiple substitute parts be used interchangeably in production?

A: Yes, provided all selected parts meet the minimum electrical requirements: 24V standoff voltage, 26.7V breakdown voltage, and DO-214AC (SMA) package compatibility. Verify supplier availability and lead times before committing to multiple sources. Maintain consistent part selection within production batches to ensure uniform circuit performance.

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