SMAJ15 Equivalent & Substitute Parts

Part Overview

The SMAJ15 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 15V reverse standoff voltage with a 25.62V maximum clamping voltage and 16.4A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ15 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across reverse standoff voltage, clamping voltage, peak pulse current, and power dissipation specifications while supporting the same surface-mount package format.

Key Parameters

Parameter	SMAJ15 (Littelfuse)	Unit
Voltage - Reverse Standoff (Typ)	15	V
Voltage - Breakdown (Min)	15.84	V
Voltage - Clamping (Max) @ Ipp	25.62	V
Current - Peak Pulse (10/1000µs)	16.4	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65°C ~ 150°C (TJ)	°C
Package / Case	DO-214AC, SMA	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ15 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 15V (exact match required)
Voltage - Breakdown (Min): 15.84V minimum
Voltage - Clamping (Max) @ Ipp: Must not exceed 27.7V
Current - Peak Pulse (10/1000µs): Minimum 16.4A
Power - Peak Pulse: Minimum 400W
Package / Case: DO-214AC or SMA (surface mount)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed maintain the 15V reverse standoff voltage specification and support general-purpose transient voltage suppression applications. Clamping voltage variations (24.4V to 27.7V) and peak pulse current variations (16.4A to 123A) reflect different manufacturer implementations within acceptable operating parameters for this device category. Parts are grouped by active product status and availability to facilitate direct replacement in production environments.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status
SMAJ15	Littelfuse Inc.	15V	15.84V	25.62V	16.4A	400W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Obsolete
SMAJ15A	EVVO Semi	15V	16.7V	24.4V	16.4A	400W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Active
SMA6J15A-E3/5A	Vishay General Semiconductor - Diodes Division	15V	16.7V	27.7V	123A (8/20µs)	4000W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Active
SMA6J15A-E3/61	Vishay General Semiconductor - Diodes Division	15V	16.7V	27.7V	123A (8/20µs)	4000W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Active
SMA6J15A-TP	Micro Commercial Co	15V	16.7V	24.4V	24.6A	600W	-55°C ~ 175°C (TA)	DO-214AC, SMA	Active
SMAJ15A-13-F	Diodes Incorporated	15V	16.7V	24.4V	16.4A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Active
SMAJ15A-TP	Micro Commercial Co	15V	16.7V	24.4V	16.4A	400W	-55°C ~ 175°C (TA)	DO-214AC, SMA	Active
SMAJ15AE3/TR13	Microchip Technology	15V	16.7V	24.4V	20.6A	500W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Active
SMAJ15E3/TR13	Microchip Technology	15V	16.7V	26.9V	18.8A	500W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Active
TV04A150J-G	Comchip Technology	15V	16.7V	24.4V	16.39A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Active

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, meeting current regulatory and manufacturing requirements. The SMAJ15A variants from EVVO Semi, Diodes Incorporated, and Micro Commercial Co maintain electrical specifications closest to the original SMAJ15, with 24.4V clamping voltage and 16.4A peak pulse current. These parts are recommended for direct replacement in existing designs requiring minimal circuit re-qualification.

The Vishay SMA6J15A-E3/5A and SMA6J15A-E3/61 variants offer enhanced performance with 123A peak pulse current and 4000W power dissipation, suitable for applications requiring higher transient energy absorption. The Microchip SMAJ15AE3/TR13 and SMAJ15E3/TR13 variants provide intermediate performance levels with 20.6A and 18.8A peak pulse current respectively, supporting extended operating temperature ranges to 175°C (TA) in select models.

All substitute parts maintain the DO-214AC (SMA) surface-mount package format, ensuring mechanical compatibility with existing PCB layouts and automated assembly processes. Selection should be based on specific application requirements for clamping voltage tolerance, peak pulse current capacity, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can SMAJ15A variants be used as direct replacements for the obsolete SMAJ15?

A: Yes. SMAJ15A parts from EVVO Semi, Diodes Incorporated, and Micro Commercial Co maintain the 15V reverse standoff voltage, 16.4A peak pulse current, and 400W power dissipation of the original SMAJ15. All are ROHS3 compliant with MSL 1 ratings and use the same DO-214AC (SMA) package.

Q: What is the difference between 24.4V and 27.7V clamping voltage variants?

A: Clamping voltage represents the maximum voltage across the TVS diode during transient suppression at peak pulse current. Lower clamping voltage (24.4V) provides tighter voltage regulation, while higher clamping voltage (27.7V) allows greater voltage excursion. Selection depends on circuit protection requirements and downstream component voltage ratings.

Q: Are Vishay SMA6J15A-E3 variants compatible with the SMAJ15?

A: Electrically compatible for 15V standoff applications. However, these variants feature significantly higher peak pulse current (123A vs. 16.4A) and power dissipation (4000W vs. 400W). They are suitable for high-energy transient environments but may be oversized for applications matching the original SMAJ15 specifications.

Q: What packaging options are available for SMAJ15 substitutes?

A: All substitute parts use the DO-214AC (SMA) surface-mount package. Packaging formats include Cut Tape (CT), Digi-Reel, and Tape & Reel (TR) options. Selection depends on procurement and assembly requirements.

Q: Do all substitute parts support the same operating temperature range as the SMAJ15?

A: Most variants support -55°C to 150°C or -65°C to 150°C ranges. Micro Commercial Co SMAJ15A-TP variants extend to 175°C (TA). Verify specific temperature requirements for your application before selection.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, meeting current manufacturing and environmental standards.

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