1SMB14AT3 Equivalent & Substitute Parts

Part Overview

The 1SMB14AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 14V reverse standoff voltage with a 23.2V maximum clamping voltage and 25.8A peak pulse current capability in the DO-214AA (SMB) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	14V
Voltage - Breakdown (Min)	15.6V
Voltage - Clamping (Max) @ Ipp	23.2V
Current - Peak Pulse (10/1000µs)	25.8A
Power - Peak Pulse	600W
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 150°C (TJ)

Substitute Part Grouping Explanation

Substitution of the 1SMB14AT3 is determined by strict electrical and mechanical parameter matching:

Critical Matching Parameters:

Voltage - Reverse Standoff: 14V (±0V tolerance for direct substitution)
Voltage - Clamping (Max) @ Ipp: 23.2V
Current - Peak Pulse (10/1000µs): 25.8A minimum
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Unidirectional Channels: 1

All identified substitute parts meet these electrical specifications within the allowed parameter ranges. Package compatibility (DO-214AA/SMB) ensures mechanical and thermal interchangeability on existing PCB layouts. Operating temperature ranges may vary between manufacturers but all substitutes support the minimum required range of -55°C to 150°C.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status	RoHS Status
1SMB14AT3	onsemi	14V	23.2V	25.8A	600W	-65°C ~ 150°C	Obsolete	RoHS non-compliant
SMBJ14A	MDD	14V	23.2V	25.9A	600W	-50°C ~ 150°C	Active	ROHS3 Compliant
SMBJ14A-13-F	Diodes Incorporated	14V	23.2V	25.8A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ14A-HR	Littelfuse Inc.	14V	23.2V	25.9A	600W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ14A-HRA	Littelfuse Inc.	14V	23.2V	25.9A	600W	-65°C ~ 150°C	Active	ROHS3 Compliant
SMBJ14A-M3/52	Vishay General Semiconductor - Diodes Division	14V	23.2V	25.9A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ14A-M3/5B	Vishay General Semiconductor - Diodes Division	14V	23.2V	25.9A	600W	-55°C ~ 150°C	Active	ROHS3 Compliant
SMBJ14A-TP	Micro Commercial Co	14V	23.2V	25.8A	600W	-55°C ~ 175°C	Active	ROHS3 Compliant
SMBJ14AE3/TR13	Microchip Technology	14V	23.2V	25.8A	600W	-65°C ~ 150°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts provide electrical and mechanical equivalence to the 1SMB14AT3. Selection should prioritize active product status and compliance certifications:

Primary Recommendation: SMBJ14A (MDD) or SMBJ14A-13-F (Diodes Incorporated) offer the most direct substitution with active product status and ROHS3 compliance. Both maintain identical electrical specifications and DO-214AA/SMB packaging.

Extended Temperature Range Option: SMBJ14A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, providing additional thermal margin for high-temperature applications while maintaining all electrical parameters.

High-Reliability Options: SMBJ14A-HR and SMBJ14A-HRA (Littelfuse Inc.) are designated high-reliability variants with -65°C lower temperature limit, matching the original 1SMB14AT3 temperature range and suitable for demanding environments.

Vishay TransZorb® Series: SMBJ14A-M3/52 and SMBJ14A-M3/5B provide established alternatives with proven field performance and ROHS3 compliance.

All substitutes are available in active production with substantial inventory levels, ensuring supply continuity and cost-effective procurement.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 1SMB14AT3 with any of these substitute parts?

A: Yes. All listed parts meet the critical electrical parameters (14V reverse standoff, 23.2V clamping voltage, 25.8A+ peak pulse current, 600W peak power) and use identical DO-214AA/SMB packaging. Direct PCB substitution is mechanically and electrically compatible.

Q: What is the difference between SMBJ14A variants from different manufacturers?

A: The core electrical specifications are identical across all variants. Differences exist in product status (all active), operating temperature ranges, and manufacturer-specific packaging codes (e.g., -TP, -HR, -HRA, -M3/52). Selection depends on temperature requirements and supply chain preferences.

Q: Why is the original 1SMB14AT3 obsolete?

A: The 1SMB14AT3 is marked obsolete by onsemi. Active equivalent parts from other manufacturers provide superior availability, compliance certifications (ROHS3), and ongoing production support.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not prevent substitution if the substitute meets or exceeds the application's temperature requirements. For applications requiring -65°C operation, select SMBJ14A-HR, SMBJ14A-HRA, or SMBJ14AE3/TR13. For standard -55°C to 150°C applications, all substitutes are suitable.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. The original 1SMB14AT3 is RoHS non-compliant, making substitution beneficial for RoHS-regulated applications.

Q: What packaging formats are available?

A: All substitutes use DO-214AA/SMB surface-mount packaging. Some are supplied in Tape & Reel (TR) format for automated assembly. Verify packaging format with your supplier for procurement requirements.

Q: Can I use SMBJ14A-TP for applications requiring extended temperature operation?

A: Yes. SMBJ14A-TP supports -55°C to 175°C operating range, providing 25°C additional upper temperature margin compared to the standard 1SMB14AT3 specification (-65°C to 150°C).

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