SZ1SMB13AT3G Equivalent & Substitute Parts

Part Overview

The SZ1SMB13AT3G is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, designed for surface mount applications in the DO-214AA (SMB) package. This unidirectional zener diode provides transient voltage suppression with a 13V reverse standoff voltage and 21.5V maximum clamping voltage. The part is actively produced and widely stocked, with 3336 units available in inventory. Substitute parts are identified when electrical parameters, mechanical compatibility, and regulatory compliance align with the original specification.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	13	V
Voltage - Breakdown (Min)	14.4	V
Voltage - Clamping (Max) @ Ipp	21.5	V
Current - Peak Pulse (10/1000µs)	27.9	A
Power - Peak Pulse	600	W
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65°C ~ 150°C	TJ
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SZ1SMB13AT3G are qualified based on the following criteria:

Voltage Parameters: Reverse standoff voltage of 13V, breakdown voltage minimum of 14.4V, and clamping voltage maximum of 21.5V must be identical
Current Rating: Peak pulse current (10/1000µs) must be 27.9A or higher
Power Dissipation: Peak pulse power rating of 600W or greater
Package Compatibility: DO-214AA (SMB) surface mount package required
Regulatory Compliance: ROHS3 compliance and MSL 1 rating mandatory
Unidirectional Configuration: Single channel zener diode topology

All substitute parts listed below meet these electrical and mechanical requirements and maintain compatibility with the original design specification.

Parameter Comparison

Parameter	SZ1SMB13AT3G (Littelfuse)	SMBJ13A (MDD)	SMBJ13A-TP (Micro Commercial Co)	SMBJ13A-13-F (Diodes Incorporated)	SMBJ13A-TR (STMicroelectronics)	SMBJE13AH (Eaton)
Voltage - Reverse Standoff (Typ)	13V	13V	13V	13V	13V	13V
Voltage - Breakdown (Min)	14.4V	14.4V	14.4V	14.4V	14.4V	14.4V
Voltage - Clamping (Max) @ Ipp	21.5V	21.5V	21.5V	21.5V	21.5V	21.5V
Current - Peak Pulse (10/1000µs)	27.9A	28A	27.9A	27.9A	29A	27.9A
Power - Peak Pulse	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
Operating Temperature Range	-65°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and full ROHS3 compliance with MSL 1 rating. Selection among substitutes depends on application-specific requirements:

SMBJ13A (MDD) offers the highest inventory availability at 56,400 units and maintains all electrical specifications within tolerance.

SMBJ13A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, providing thermal margin for high-temperature applications while maintaining the original -55°C lower limit.

SMBJ13A-13-F (Diodes Incorporated) provides 35,300 units in stock with standard operating range and established supply chain presence.

SMBJ13A-TR (STMicroelectronics) delivers the highest peak pulse current rating at 29A, offering additional current margin for transient suppression applications.

SMBJE13AH (Eaton) carries automotive-grade qualification (AEC-Q101) matching the original SZ1SMB13AT3G specification, suitable for automotive and mission-critical applications requiring formal qualification documentation.

Frequently Asked Questions (FAQ)

Q: Can I substitute SMBJ13A for SZ1SMB13AT3G in my design?

A: Yes. Both parts share identical voltage parameters (13V standoff, 14.4V breakdown, 21.5V clamping), equivalent peak pulse current ratings (28A vs 27.9A), and the same DO-214AA SMB package. Both are ROHS3 compliant with MSL 1 rating. The primary difference is operating temperature range: SMBJ13A operates -50°C to 150°C versus SZ1SMB13AT3G at -65°C to 150°C. Verify your application's minimum temperature requirement.

Q: What is the difference between SMBJ13A-TP and SMBJ13A-TR?

A: Both maintain identical voltage and power specifications. SMBJ13A-TP (Micro Commercial Co) extends upper operating temperature to 175°C. SMBJ13A-TR (STMicroelectronics) provides slightly higher peak pulse current at 29A versus 27.9A. Choose SMBJ13A-TP for thermal margin; choose SMBJ13A-TR for current margin.

Q: Is SMBJE13AH suitable for automotive applications?

A: Yes. SMBJE13AH carries AEC-Q101 automotive qualification, matching the original SZ1SMB13AT3G specification. Both parts are qualified for automotive-grade reliability and environmental stress screening.

Q: Do all substitute parts use the same DO-214AA SMB package?

A: Yes. All substitute parts listed use the DO-214AA (SMB) surface mount package, ensuring mechanical and footprint compatibility with the original design without PCB layout modifications.

Q: What inventory considerations should I evaluate?

A: SMBJ13A (MDD) offers maximum availability at 56,400 units. SMBJ13A-13-F (Diodes Incorporated) provides 35,300 units. SMBJ13A-TP (Micro Commercial Co) stocks 6,243 units. SMBJ13A-TR (STMicroelectronics) has 2,308 units. Evaluate lead time and supply chain stability based on your procurement timeline.

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