P6SMB170 Equivalent & Substitute Parts

Part Overview

The P6SMB170 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 145V reverse standoff voltage with a 245.7V maximum clamping voltage at peak pulse current, housed in a DO-214AA (SMB) surface mount package. The P6SMB170 is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	145V
Voltage - Breakdown (Min)	153.45V
Voltage - Clamping (Max) @ Ipp	245.7V
Current - Peak Pulse (10/1000µs)	2.6A
Power - Peak Pulse	600W
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution eligibility for the P6SMB170 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 145V
Voltage - Clamping (Max) @ Ipp: 234V–245.7V range
Current - Peak Pulse (10/1000µs): 2.6A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Type: Zener, Unidirectional (1 channel)
Operating Temperature: -55°C to -65°C minimum; 150°C maximum

The identified substitute parts maintain electrical equivalence within these parameters while offering active product status and improved availability compared to the obsolete P6SMB170.

Parameter Comparison

Parameter	P6SMB170 (Littelfuse)	P6SMB170A (Eaton)	SMBJP6KE170A-TP (Micro Commercial Co)
Voltage - Reverse Standoff (Typ)	145V	145V	145V
Voltage - Breakdown (Min)	153.45V	162V	162V
Voltage - Clamping (Max) @ Ipp	245.7V	234V	234V
Current - Peak Pulse (10/1000µs)	2.6A	2.6A	2.6A
Power - Peak Pulse	600W	600W	600W
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Type	Zener	Zener	Zener
Unidirectional Channels	1	1	1
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both P6SMB170A (Eaton - Electronics Division) and SMBJP6KE170A-TP (Micro Commercial Co) are active product alternatives to the obsolete P6SMB170. Selection between these substitutes should be based on the following factors:

P6SMB170A (Eaton): This part maintains identical electrical specifications and operating temperature range to the original P6SMB170. It carries RoHS compliance certification and unlimited moisture sensitivity rating. With 41,300 units in stock, this option provides superior availability for high-volume procurement.

SMBJP6KE170A-TP (Micro Commercial Co): This part offers an extended minimum operating temperature of -65°C compared to -55°C for the original, providing enhanced low-temperature performance. It is supplied in Tape & Reel packaging and carries ROHS3 compliance with REACH Unaffected status. Inventory of 3,121 units supports moderate-volume requirements.

Both substitutes are electrically compatible within the specified parameter tolerances. The clamping voltage differential (234V versus 245.7V) falls within acceptable engineering margins for general-purpose transient suppression applications. Package compatibility is confirmed for both alternatives in DO-214AA (SMB) format.

Frequently Asked Questions (FAQ)

Q: Can P6SMB170A and SMBJP6KE170A-TP be used interchangeably with the P6SMB170?

A: Yes, both parts meet the electrical and mechanical substitution criteria. All three components share identical reverse standoff voltage (145V), peak pulse current (2.6A), power dissipation (600W), and package format (DO-214AA, SMB). The clamping voltage variance (234V–245.7V) is within acceptable tolerance for general-purpose TVS applications.

Q: What is the significance of the clamping voltage difference between 245.7V and 234V?

A: The clamping voltage represents the maximum voltage across the TVS diode during peak pulse conditions. The P6SMB170 specifies 245.7V maximum, while both substitutes specify 234V maximum. This 11.7V difference indicates the substitutes provide slightly lower clamping voltage, which is acceptable for circuit protection and may offer marginal performance improvement in some applications.

Q: Are there packaging differences between these parts?

A: All three parts use the DO-214AA (SMB) surface mount package. The SMBJP6KE170A-TP is supplied in Tape & Reel format, while packaging details for the P6SMB170 and P6SMB170A are not specified in the provided data. Tape & Reel packaging is standard for automated assembly processes.

Q: What compliance certifications apply to these substitutes?

A: P6SMB170A carries RoHS compliance certification. SMBJP6KE170A-TP carries ROHS3 compliance and REACH Unaffected status. Both parts maintain MSL 1 (Unlimited) moisture sensitivity rating, indicating no special storage or handling requirements.

Q: Does the extended temperature range of SMBJP6KE170A-TP (-65°C to 150°C) provide an advantage?

A: The SMBJP6KE170A-TP supports operation down to -65°C compared to -55°C for the original P6SMB170 and P6SMB170A. This extended low-temperature capability is beneficial only if your application requires operation below -55°C. For standard operating conditions, this difference is not a functional advantage.

Q: Which substitute should be selected for new designs?

A: Selection depends on procurement requirements and application constraints. P6SMB170A offers maximum availability (41,300 units) and identical specifications to the original. SMBJP6KE170A-TP provides extended low-temperature performance and REACH compliance if required by your supply chain specifications.

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