SZP6SMB51AT3G Equivalent & Substitute Parts

Part Overview

The SZP6SMB51AT3G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the DO-214AA (SMB) package. This component operates with a reverse standoff voltage of 43.6V and provides clamping protection at 70.1V with a peak pulse current rating of 8.6A. The part is actively produced, AEC-Q101 qualified for automotive applications, and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics and package compatibility to support procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	43.6V
Voltage - Breakdown (Min)	48.5V
Voltage - Clamping (Max) @ Ipp	70.1V
Current - Peak Pulse (10/1000µs)	8.6A
Power - Peak Pulse	600W
Operating Temperature Range	-65°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SZP6SMB51AT3G are qualified based on the following critical parameters:

Voltage - Reverse Standoff (Typ): 43.6V
Voltage - Clamping (Max) @ Ipp: 70.1V
Voltage - Breakdown (Min): 48.5V
Package / Case: DO-214AA, SMB
Type: Zener, Unidirectional
Unidirectional Channels: 1

All identified substitutes maintain identical voltage specifications and package compatibility. Variations in peak pulse current (8.6A to 14.3A) and power dissipation (600W to 1000W) represent enhanced performance characteristics that remain functionally compatible within the same application envelope. Operating temperature ranges and compliance certifications are provided for design consideration.

Parameter Comparison

Parameter	SZP6SMB51AT3G (Littelfuse)	1KSMB51A (Taiwan Semiconductor)	P6SMB51A (Eaton)	TPSMB51A (Littelfuse)	SMBJP6KE51A-TP (Micro Commercial)
Voltage - Reverse Standoff (Typ)	43.6V	43.6V	43.6V	43.6V	43.6V
Voltage - Breakdown (Min)	48.5V	48.5V	48.5V	48.5V	48.5V
Voltage - Clamping (Max) @ Ipp	70.1V	70.1V	70.1V	70.1V	70.1V
Current - Peak Pulse (10/1000µs)	8.6A	14.3A	8.7A	8.7A	8.7A
Power - Peak Pulse	600W	1000W	600W	600W	600W
Operating Temperature Range	-65°C ~ 150°C	-55°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 175°C	-55°C ~ 175°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Type	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts maintain active product status and full RoHS3 compliance, ensuring regulatory alignment with current manufacturing standards. The SZP6SMB51AT3G and TPSMB51A are both Littelfuse products with AEC-Q101 automotive qualification, providing continuity for automotive-grade applications. The 1KSMB51A from Taiwan Semiconductor Corporation offers enhanced current handling (14.3A) and power dissipation (1000W) with an extended upper operating temperature of 175°C, suitable for applications requiring higher thermal margins. The P6SMB51A from Eaton and SMBJP6KE51A-TP from Micro Commercial Co provide functionally equivalent performance at standard 600W power ratings with extended temperature ranges. All parts share identical voltage specifications and SMB package geometry, enabling direct substitution within the same PCB footprint.

Frequently Asked Questions (FAQ)

Q: Can the 1KSMB51A replace the SZP6SMB51AT3G in all applications?

A: Yes, from an electrical standpoint. The 1KSMB51A maintains identical voltage specifications (43.6V standoff, 70.1V clamping) and package compatibility (DO-214AA SMB). The higher peak pulse current (14.3A vs 8.6A) and power rating (1000W vs 600W) represent enhanced performance margins. Verify that the application does not impose constraints on these enhanced characteristics.

Q: What is the difference between the operating temperature ranges?

A: The SZP6SMB51AT3G operates from -65°C to 150°C, while alternatives such as TPSMB51A and SMBJP6KE51A-TP extend to 175°C. Selection depends on the thermal environment of the application. The lower minimum temperature of -65°C on the SZP6SMB51AT3G and TPSMB51A may be required for extreme cold-weather applications.

Q: Are all substitute parts automotive-qualified?

A: The SZP6SMB51AT3G and TPSMB51A carry AEC-Q101 qualification. The 1KSMB51A, P6SMB51A, and SMBJP6KE51A-TP do not list AEC-Q101 qualification in the provided specifications. For automotive applications requiring this certification, use SZP6SMB51AT3G or TPSMB51A.

Q: Do all parts use the same SMB package?

A: Yes. All substitute parts use the DO-214AA (SMB) package designation, ensuring identical PCB footprint and mounting compatibility. No layout modifications are required for substitution.

Q: What is the significance of the peak pulse current difference?

A: Peak pulse current (8.6A to 14.3A) indicates the maximum transient current the diode can suppress during a 10/1000µs pulse. Higher ratings provide greater protection margin for high-energy transient events. The SZP6SMB51AT3G at 8.6A is suitable for standard applications; higher-rated alternatives offer enhanced protection for demanding environments.

Q: Are all parts RoHS compliant?

A: Yes. All substitute parts are RoHS compliant. The SZP6SMB51AT3G, 1KSMB51A, TPSMB51A, and SMBJP6KE51A-TP are ROHS3 compliant. The P6SMB51A is RoHS compliant. All meet current environmental regulations.

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