SMAJ15C Equivalent & Substitute Parts

Part Overview

The SMAJ15C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component 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 SMAJ15C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMAJ15C
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	15V
Voltage - Breakdown (Min)	15.84V
Voltage - Clamping (Max) @ Ipp	25.62V
Current - Peak Pulse (10/1000µs)	16.4A
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the SMAJ15C are selected based on strict electrical and mechanical compatibility criteria. The following parameters define acceptable substitution:

Critical Parameters for Substitution:

Voltage - Reverse Standoff (Typ): 15V (exact match required)
Voltage - Breakdown (Min): 15.84V to 16.7V (acceptable range)
Package / Case: DO-214AC, SMA (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Bidirectional Channels: 1 (functional equivalence)
Type: Zener (device classification)

Acceptable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 24.4V to 32.5V (within functional tolerance for general-purpose protection)
Current - Peak Pulse (10/1000µs): 16.4A to 71A (higher ratings provide equivalent or enhanced protection)
Power - Peak Pulse: 400W to 600W (higher ratings acceptable)
Operating Temperature: -65°C to -55°C minimum; 150°C to 175°C maximum (overlapping ranges acceptable)

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring environmental and moisture compatibility with the original specification.

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	Package	Product Status
SMAJ15C	Littelfuse Inc.	15V	15.84V	25.62V	16.4A	400W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Obsolete
SMAJ15CA	EVVO Semi	15V	16.7V	24.4V	16.4A	400W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Active
SZ1SMA15CAT3G	Littelfuse Inc.	15V	16.7V	24.4V	16.4A	400W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Active
SMA6J15CA-TP	Micro Commercial Co	15V	16.7V	24.4V	24.6A	600W	-55°C ~ 175°C (TA)	DO-214AC, SMA	Active
SMAJ15CA-13-F	Diodes Incorporated	15V	16.7V	24.4V	16.4A	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Active
SMAJ15CA-TP	Micro Commercial Co	15V	16.7V	24.4V	16.4A	400W	-55°C ~ 175°C (TA)	DO-214AC, SMA	Active
SMAJ15CA-TR	STMicroelectronics	15V	16.7V	32.5V	71A (8/20µs)	400W	-55°C ~ 150°C (TJ)	DO-214AC, SMA	Active
SMAJ15CAE3/TR13	Microchip Technology	15V	16.7V	24.4V	20.6A	500W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Active
SMAJ15CE3/TR13	Microchip Technology	15V	16.7V	26.9V	18.8A	500W	-65°C ~ 150°C (TJ)	DO-214AC, SMA	Active
TV04A150JB-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 rating, meeting the environmental and regulatory requirements of the obsolete SMAJ15C.

Primary Substitutes (Closest Electrical Match): SMAJ15CA (EVVO Semi), SMAJ15CA-13-F (Diodes Incorporated), SMAJ15CA-TP (Micro Commercial Co), and TV04A150JB-G (Comchip Technology) provide direct electrical equivalence with 15V reverse standoff, 16.7V minimum breakdown, 24.4V clamping, and 16.4A peak pulse current. These parts maintain identical power dissipation (400W) and operating temperature ranges compatible with the original specification.

Enhanced Performance Alternatives: SMAJ15CAE3/TR13 (Microchip Technology) offers increased peak pulse current (20.6A) and power dissipation (500W) while maintaining the same voltage ratings. SMAJ15CE3/TR13 (Microchip Technology) provides higher clamping voltage (26.9V) with 18.8A peak pulse current and 500W power rating. SMA6J15CA-TP (Micro Commercial Co) delivers the highest performance with 24.6A peak pulse current and 600W power dissipation, suitable for applications requiring enhanced transient protection.

Automotive-Grade Option: SZ1SMA15CAT3G (Littelfuse Inc.) is qualified to AEC-Q101 automotive standards, providing the same electrical specifications as SMAJ15CA with automotive-grade reliability assurance.

High-Current Alternative: SMAJ15CA-TR (STMicroelectronics) features significantly elevated peak pulse current (71A at 8/20µs) and higher clamping voltage (32.5V), suitable for applications with more severe transient conditions.

Frequently Asked Questions (FAQ)

Q: Can SMAJ15CA directly replace SMAJ15C in existing designs? A: Yes. SMAJ15CA maintains the critical electrical parameters: 15V reverse standoff voltage, compatible breakdown voltage (16.7V), and identical 16.4A peak pulse current. Both use DO-214AC (SMA) packaging for direct mechanical compatibility. The primary difference is product status—SMAJ15C is obsolete while SMAJ15CA is active production.

Q: What is the significance of clamping voltage variation (24.4V to 32.5V) among substitutes? A: Clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit during a transient event. All listed substitutes maintain clamping voltages within acceptable ranges for general-purpose protection applications. Higher clamping voltages (such as SMAJ15CA-TR at 32.5V) provide less aggressive clamping but may be suitable for applications with higher voltage tolerance. Lower clamping voltages (24.4V) provide tighter protection.

Q: Are there packaging differences between substitute parts? A: All substitute parts use DO-214AC (SMA) surface-mount packaging, ensuring mechanical and assembly compatibility. Packaging options vary by manufacturer (Cut Tape, Digi-Reel, or Tape & Reel), but the physical component package remains identical.

Q: Which substitute offers the best performance upgrade? A: SMA6J15CA-TP (Micro Commercial Co) provides the highest performance with 24.6A peak pulse current and 600W power dissipation, along with an extended operating temperature range (-55°C to 175°C). This part is suitable for applications requiring enhanced transient protection capability.

Q: Is automotive qualification available? A: Yes. SZ1SMA15CAT3G (Littelfuse Inc.) carries AEC-Q101 automotive qualification, providing automotive-grade reliability assurance while maintaining electrical equivalence to the original SMAJ15C specification.

Q: What is the difference between operating temperature specifications (TJ vs TA)? A: TJ (junction temperature) represents the maximum temperature at the semiconductor junction, while TA (ambient temperature) represents the surrounding air temperature. Both specifications define acceptable operating ranges; parts with TJ ratings are typically more conservative. All substitutes operate within acceptable temperature ranges for general-purpose applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message