SZP6SMB180AT3G Equivalent & Substitute Parts

Part Overview

The SZP6SMB180AT3G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for surface mount applications in the SMB package. This component provides transient voltage protection with a 154V reverse standoff voltage and 246V maximum clamping voltage. The part is actively produced and carries AEC-Q101 automotive qualification, making it suitable for automotive and industrial protection circuits. Substitute parts are identified to address inventory availability, lead time requirements, or regional sourcing needs while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	154	V
Voltage - Breakdown (Min)	171	V
Voltage - Clamping (Max) @ Ipp	246	V
Current - Peak Pulse (10/1000µs)	2.4	A
Power - Peak Pulse	600	W
Capacitance @ 1MHz	130	pF
Operating Temperature Range	-65 to 150	°C
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the SZP6SMB180AT3G is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 154V
Voltage - Breakdown (Min): 171V
Voltage - Clamping (Max) @ Ipp: 246V
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Unidirectional Channels: 1
Type: Zener

The substitute part P6SMB180A from Eaton - Electronics Division meets all electrical specifications and package requirements. Peak pulse current differs slightly (2.5A vs. 2.4A), which remains within the functional tolerance for this protection application. Both parts share identical voltage ratings, clamping characteristics, and physical packaging, enabling direct substitution in circuit designs.

Parameter Comparison

Parameter	SZP6SMB180AT3G (Littelfuse)	P6SMB180A (Eaton)	Match Status
Voltage - Reverse Standoff (Typ)	154V	154V	Equivalent
Voltage - Breakdown (Min)	171V	171V	Equivalent
Voltage - Clamping (Max) @ Ipp	246V	246V	Equivalent
Current - Peak Pulse (10/1000µs)	2.4A	2.5A	Compatible
Power - Peak Pulse	600W	600W	Equivalent
Operating Temperature Range	-65 to 150°C	-55 to 150°C	Compatible
Package / Case	DO-214AA, SMB	DO-214AA, SMB	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Type	Zener	Zener	Equivalent
Unidirectional Channels	1	1	Equivalent
RoHS Status	ROHS3 Compliant	RoHS Compliant	Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The P6SMB180A from Eaton - Electronics Division is a direct electrical and mechanical equivalent to the SZP6SMB180AT3G. Both parts are active products with confirmed inventory availability. The Littelfuse part carries AEC-Q101 automotive qualification; the Eaton part is RoHS compliant and suitable for telecom applications. Selection between these parts should be based on:

Inventory availability and lead time requirements
Regional supplier preference and logistics
Compliance certifications required by the end application
Cost considerations and volume pricing

The operating temperature range of the Eaton part (-55 to 150°C) is narrower than the Littelfuse part (-65 to 150°C) by 10°C at the lower bound. This difference is not significant for most industrial and automotive applications operating within standard temperature ranges.

Frequently Asked Questions (FAQ)

Q: Can P6SMB180A replace SZP6SMB180AT3G in automotive applications?

A: Yes. Both parts share identical voltage ratings (154V standoff, 246V clamping), peak pulse power (600W), and SMB package specifications. The P6SMB180A is suitable for automotive use, though the Littelfuse part carries explicit AEC-Q101 qualification. Verify application-specific qualification requirements before selection.

Q: What is the difference in peak pulse current between these parts?

A: The SZP6SMB180AT3G is rated at 2.4A peak pulse current, while the P6SMB180A is rated at 2.5A. This 0.1A difference does not affect substitution compatibility for standard transient protection circuits.

Q: Are the packages physically identical?

A: Yes. Both parts use the DO-214AA SMB surface mount package with identical pin configuration and footprint. No PCB layout modifications are required for substitution.

Q: What is the temperature range difference?

A: The Littelfuse part operates from -65 to 150°C; the Eaton part from -55 to 150°C. The 10°C difference at the lower temperature limit does not impact most applications. Verify if your circuit operates below -55°C before selecting the Littelfuse part.

Q: Are both parts RoHS compliant?

A: Yes. The SZP6SMB180AT3G is ROHS3 compliant; the P6SMB180A is RoHS compliant. Both meet environmental compliance requirements for industrial and consumer electronics.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. Identical SMB package, pin configuration, and electrical specifications enable direct substitution without PCB redesign or assembly process changes.

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