SMBJ15C Equivalent & Substitute Parts

Part Overview

The SMBJ15C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 15V reverse standoff voltage and provides clamping at 25.62V with a peak pulse current of 24.6A. The SMBJ15C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives with matching electrical characteristics and DO-214AA/SMB packaging are available from multiple manufacturers.

Key Parameters

Parameter	Value	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)	24.6	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ15C is determined by strict alignment of the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 15V (required match)
Voltage - Clamping (Max) @ Ipp: 24.4V to 25.62V (acceptable range)
Current - Peak Pulse (10/1000µs): 24A to 32.8A (acceptable range)
Power - Peak Pulse: 600W to 800W (acceptable range)
Package / Case: DO-214AA or SMB (required match)
Mounting Type: Surface Mount (required match)
RoHS Status: ROHS3 Compliant (required match)
Moisture Sensitivity Level: 1 (Unlimited) (required match)

All substitute parts listed maintain these critical parameters within acceptable tolerances for direct functional replacement in the same circuit application.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temperature (°C)	Product Status	Package
SMBJ15C	Littelfuse Inc.	15	25.62	24.6	600	-65 to 150	Obsolete	DO-214AA, SMB
SMBJ15CA	EVVO Semi	15	24.4	24.6	600	-65 to 150	Active	DO-214AA, SMB
SZ1SMB15CAT3G	Littelfuse Inc.	15	24.4	24	600	-65 to 150	Active	DO-214AA, SMB
SMB8J15CA-E3/52	Vishay General Semiconductor - Diodes Division	15	24.4	32.8	800	-55 to 150	Active	DO-214AA, SMB
SMB8J15CA-E3/5B	Vishay General Semiconductor - Diodes Division	15	24.4	32.8	800	-55 to 150	Active	DO-214AA, SMB
SMBJ15CA-13-F	Diodes Incorporated	15	24.4	24	600	-55 to 150	Active	DO-214AA, SMB
SMBJ15CA-M3/52	Vishay General Semiconductor - Diodes Division	15	24.4	24.6	600	-55 to 150	Active	DO-214AA, SMB
SMBJ15CA-M3/5B	Vishay General Semiconductor - Diodes Division	15	24.4	24.6	600	-55 to 150	Active	DO-214AA, SMB
SMBJ15CA-TP	Micro Commercial Co	15	24.4	24	600	-55 to 175	Active	DO-214AA, SMB
SMBJ15CA-TR	STMicroelectronics	15	24.4	25.1	600	-55 to 150	Active	DO-214AA, SMB

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance and MSL 1 (Unlimited) rating, meeting the regulatory and environmental requirements of the obsolete SMBJ15C. Selection among these alternatives depends on specific application constraints:

Littelfuse Inc. SZ1SMB15CAT3G is recommended for applications requiring automotive-grade qualification (AEC-Q101 certified) and extended supply chain availability.

Vishay General Semiconductor SMB8J15CA-E3/52 and SMB8J15CA-E3/5B provide enhanced current handling (32.8A peak pulse) and power dissipation (800W), suitable for applications with higher transient stress requirements.

STMicroelectronics SMBJ15CA-TR offers the closest peak pulse current match (25.1A) to the original SMBJ15C specification.

Micro Commercial Co SMBJ15CA-TP extends the upper operating temperature to 175°C, accommodating high-temperature environments.

All substitute parts maintain the 15V reverse standoff voltage and clamping voltage range (24.4V) within acceptable engineering tolerances for direct circuit replacement.

Frequently Asked Questions (FAQ)

Q: Can SMBJ15CA from EVVO Semi directly replace SMBJ15C?

A: Yes. SMBJ15CA maintains the 15V reverse standoff voltage, 24.4V clamping voltage, 24.6A peak pulse current, and 600W power rating. The DO-214AA/SMB package and surface-mount configuration are identical. Both are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between SMBJ15CA-M3/52 and SMBJ15CA-M3/5B?

A: Both parts are manufactured by Vishay and share identical electrical specifications: 15V standoff, 24.4V clamping, 24.6A peak pulse, and 600W power. The suffix designates different packaging tape configurations (52 vs. 5B reel specifications). Electrical performance is equivalent.

Q: Why do some substitutes have higher peak pulse current (32.8A)?

A: Vishay SMB8J15CA variants (E3/52 and E3/5B) are rated for 32.8A peak pulse and 800W power dissipation. These provide additional margin for transient protection but remain compatible with circuits designed for the 24.6A SMBJ15C, as they will not degrade performance in lower-stress applications.

Q: Are there temperature range differences among substitutes?

A: Yes. Most substitutes operate from -55°C to 150°C. The SMBJ15CA-TP extends to 175°C upper limit. The original SMBJ15C operates from -65°C to 150°C. Verify application temperature requirements before selection.

Q: Do all substitutes have the same packaging?

A: All listed substitutes use DO-214AA/SMB surface-mount packages. Packaging options vary by manufacturer (Cut Tape, Digi-Reel, or Tape & Reel), but the component footprint and pinout are identical for PCB assembly.

Q: Is automotive qualification required for my application?

A: Only if your application demands AEC-Q101 certification. The SZ1SMB15CAT3G from Littelfuse carries this qualification. Other substitutes are suitable for general-purpose industrial and commercial applications.

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