SMBJ14C Equivalent & Substitute Parts

Part Overview

The SMBJ14C 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 14V reverse standoff voltage and provides clamping at 24.36V with a peak pulse current of 25.9A. The SMBJ14C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal performance while meeting modern compliance standards.

Key Parameters

Parameter	SMBJ14C
Voltage - Reverse Standoff (Typ)	14V
Voltage - Breakdown (Min)	14.76V
Voltage - Clamping (Max) @ Ipp	24.36V
Current - Peak Pulse (10/1000µs)	25.9A
Power - Peak Pulse	600W
Operating Temperature	-65°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ14C is determined by the following critical parameters:

Voltage - Reverse Standoff: 14V (exact match required)
Voltage - Clamping (Max) @ Ipp: 23.2V to 24.36V (acceptable range for functional equivalence)
Current - Peak Pulse (10/1000µs): 25.8A to 34.5A (equal or greater capacity)
Power - Peak Pulse: 600W to 800W (equal or greater capacity)
Package / Case: DO-214AA, SMB (physical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
RoHS Status: ROHS3 Compliant (regulatory requirement)

All identified substitute parts meet these criteria and are classified as active products, providing improved availability compared to the obsolete SMBJ14C.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status
SMBJ14C	Littelfuse Inc.	14V	24.36V	25.9A	600W	-65°C ~ 150°C	Obsolete
SMBJ14CA	MDD	14V	23.2V	25.9A	600W	-50°C ~ 150°C	Active
SZ1SMB14CAT3G	Littelfuse Inc.	14V	23.2V	25.8A	600W	-65°C ~ 150°C	Active
SMB8J14CA-E3/52	Vishay General Semiconductor - Diodes Division	14V	23.2V	34.5A	800W	-55°C ~ 150°C	Active
SMB8J14CA-E3/5B	Vishay General Semiconductor - Diodes Division	14V	23.2V	34.5A	800W	-55°C ~ 150°C	Active
SMBJ14CA-13-F	Diodes Incorporated	14V	23.2V	25.8A	600W	-55°C ~ 150°C	Active
SMBJ14CA-E3/52	Vishay General Semiconductor - Diodes Division	14V	23.2V	25.9A	600W	-55°C ~ 150°C	Active
SMBJ14CA-E3/5B	Vishay General Semiconductor - Diodes Division	14V	23.2V	25.9A	600W	-55°C ~ 150°C	Active

Engineering Selection Recommendations

All substitute parts listed maintain the 14V reverse standoff voltage specification and operate within acceptable clamping voltage tolerances. Selection should prioritize active product status to ensure long-term supply chain stability.

For applications requiring the extended lower temperature range of -65°C, SZ1SMB14CAT3G from Littelfuse Inc. is the direct equivalent, maintaining the original manufacturer's design and offering AEC-Q101 automotive qualification.

For general-purpose applications, SMBJ14CA from MDD, SMBJ14CA-13-F from Diodes Incorporated, and SMBJ14CA-E3/52 or SMBJ14CA-E3/5B from Vishay provide equivalent electrical performance with improved current and power handling in the Vishay variants (34.5A, 800W).

All substitute parts comply with ROHS3 requirements and maintain MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can SMBJ14CA directly replace SMBJ14C? A: Yes. SMBJ14CA maintains the 14V reverse standoff voltage and 25.9A peak pulse current. The clamping voltage of 23.2V is within acceptable tolerance of the original 24.36V specification. Operating temperature range is -50°C to 150°C versus the original -65°C to 150°C.

Q: What is the difference between SMBJ14CA and SMB8J14CA variants? A: SMB8J14CA variants (SMB8J14CA-E3/52 and SMB8J14CA-E3/5B) provide higher peak pulse current (34.5A) and power dissipation (800W) compared to SMBJ14CA (25.9A, 600W). Both maintain the same 14V reverse standoff and 23.2V clamping voltage. The SMB8J variants are suitable for applications requiring enhanced transient protection margin.

Q: Are packaging differences significant between substitute parts? A: All substitute parts use DO-214AA (SMB) surface-mount packaging, ensuring mechanical and assembly compatibility. Packaging variants (Tape & Reel, Cut Tape, Digi-Reel) affect supply and handling but do not impact electrical performance or PCB mounting.

Q: Which substitute offers the best temperature range coverage? A: SZ1SMB14CAT3G maintains the original -65°C to 150°C operating temperature range. This part is recommended for applications with extended low-temperature requirements. Other substitutes operate from -50°C or -55°C minimum.

Q: Do all substitutes meet RoHS compliance? A: Yes. All listed substitute parts are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity classification, meeting modern regulatory and manufacturing requirements.

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