1SMB14AT3G Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 1SMB14AT3G is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc. in the DO-214AA (SMB) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a 14V reverse standoff voltage and 23.2V maximum clamping voltage. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMB14AT3G
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Package / Case	DO-214AA, SMB
Product Status	Obsolete
Type	Zener
Unidirectional Channels	1
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
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 1SMB14AT3G are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Reverse standoff voltage: 14V (Typ)
Breakdown voltage minimum: 15.6V
Maximum clamping voltage: 23.2V
Peak pulse current: 25.8A to 25.9A
Peak pulse power: 600W
Package type: DO-214AA / SMB surface mount
Unidirectional configuration: 1 channel
RoHS3 compliance
MSL rating: 1 (Unlimited)

Substitute parts are grouped into two categories:

Group 1 - Direct Electrical Equivalents (23.2V Clamping): Parts with identical clamping voltage (23.2V) and peak pulse current within 25.8A to 25.9A range. These include SMBJ14A (MDD), SMBJ14A-HR (Littelfuse), SMBJ14A-HRA (Littelfuse), SMBJ14A-TP (Micro Commercial Co), SMBJ14A-13-F (Diodes Incorporated), SMBJ14AE3/TR13 (Microchip), and TV06B140J-G (Comchip).

Group 2 - Related Voltage Rating: SMBJ14E3/TR13 (Microchip) with 25.8V clamping voltage and 23.3A peak pulse current, suitable where slightly higher clamping voltage is acceptable. SMBJ13A (MDD) with 13V standoff and 21.5V clamping, applicable only in lower voltage protection circuits.

Parameter Comparison

Parameter	1SMB14AT3G (Main)	SMBJ14A (MDD)	SMBJ14A-HR (Littelfuse)	SMBJ14A-HRA (Littelfuse)	SMBJ14A-TP (MCC)	SMBJ14A-13-F (Diodes)	SMBJ14AE3/TR13 (Microchip)	TV06B140J-G (Comchip)
Voltage - Reverse Standoff (Typ)	14V	14V	14V	14V	14V	14V	14V	14V
Voltage - Breakdown (Min)	15.6V	15.6V	15.6V	15.6V	15.6V	15.6V	15.6V	15.6V
Voltage - Clamping (Max) @ Ipp	23.2V	23.2V	23.2V	23.2V	23.2V	23.2V	23.2V	23.2V
Current - Peak Pulse (10/1000µs)	25.8A	25.9A	25.9A	25.9A	25.8A	25.8A	25.8A	25.86A
Power - Peak Pulse	600W	600W	600W	600W	600W	600W	600W	600W
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All listed substitute parts meet the core electrical specifications of the 1SMB14AT3G and are ROHS3 compliant with MSL 1 rating. Selection among equivalents should be based on product availability and active manufacturing status.

Primary Substitutes (Active Status, Full Specification Match): SMBJ14A-HR and SMBJ14A-HRA from Littelfuse Inc. are manufacturer-recommended alternatives with active product status and identical electrical parameters. These maintain the original design intent from the obsolete 1SMB14AT3G.

SMBJ14A from MDD provides direct electrical equivalence with active status and high inventory availability (17,200 pcs).

SMBJ14A-TP from Micro Commercial Co and SMBJ14A-13-F from Diodes Incorporated are active alternatives with full parameter matching and substantial inventory levels.

Secondary Substitutes (Microchip Technology): SMBJ14AE3/TR13 matches all electrical parameters with active status. SMBJ14E3/TR13 operates at 25.8V clamping voltage with 23.3A peak pulse current, suitable only where higher clamping voltage is acceptable within circuit design margins.

Alternative Voltage Rating: SMBJ13A from MDD with 13V standoff and 21.5V clamping is applicable only in circuits designed for lower voltage protection thresholds and is not a direct substitute for 14V standoff applications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ14A-TP replace 1SMB14AT3G directly? A: Yes. SMBJ14A-TP matches all critical electrical parameters: 14V reverse standoff, 15.6V minimum breakdown, 23.2V maximum clamping, 25.8A peak pulse current, and 600W peak pulse power. Both use DO-214AA (SMB) surface mount packaging. No circuit modifications are required.

Q: What is the difference between SMBJ14A-HR and SMBJ14A-HRA? A: Both are Littelfuse manufacturer-recommended alternatives with identical electrical specifications. The suffix designations indicate different product series within Littelfuse's SMBJ line. Electrical performance and compatibility are equivalent.

Q: Why is SMBJ14E3/TR13 listed as a substitute if it has 25.8V clamping instead of 23.2V? A: SMBJ14E3/TR13 maintains the same 14V reverse standoff voltage and DO-214AA package. The higher clamping voltage (25.8V vs 23.2V) may be acceptable in applications where circuit design margins permit slightly higher transient voltage suppression levels. This part is not a direct substitute and requires circuit-level evaluation.

Q: Is SMBJ13A a suitable replacement for 1SMB14AT3G? A: SMBJ13A is not a direct substitute. It operates at 13V reverse standoff with 21.5V clamping voltage, making it suitable only for circuits designed for lower voltage protection. Use only if your application specifically requires 13V standoff protection.

Q: Are all substitute parts available in tape and reel packaging? A: Packaging varies by manufacturer and part number. SMBJ14A-HR, SMBJ14A-HRA, SMBJ14A-TP, SMBJ14A-13-F, SMBJ14AE3/TR13, SMBJ14E3/TR13, and TV06B140J-G are supplied in tape and reel (TR) format. SMBJ14A from MDD is available in standard packaging. Confirm packaging requirements with your procurement specification.

Q: Do all substitutes meet RoHS3 and MSL 1 requirements? A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the 1SMB14AT3G.

Q: Which substitute has the highest inventory availability? A: SMBJ13A from MDD has the highest inventory at 56,400 pcs. For direct 14V standoff equivalents, SMBJ14A from MDD offers 17,200 pcs in stock.

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