P4SMA170A Equivalent & Substitute Parts

Part Overview

The P4SMA170A is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This unidirectional zener diode operates in the DO-214AC (SMA) surface mount package and provides clamping protection at 234V with a peak pulse current rating of 1.8A. The component is ROHS3 compliant and maintains unlimited moisture sensitivity level (MSL 1), making it suitable for industrial and commercial electronic protection circuits. Equivalent and substitute parts are identified to support procurement flexibility, design redundancy, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	145	V
Voltage - Breakdown (Min)	162	V
Voltage - Clamping (Max) @ Ipp	234	V
Current - Peak Pulse (10/1000µs)	1.8	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA170A is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 145V
Voltage - Breakdown (Min): 162V
Voltage - Clamping (Max) @ Ipp: 234V
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Operating Temperature Range: -65°C to 150°C (TJ)
RoHS Status: ROHS3 Compliant

The P4SMA170A-E3/61, manufactured by Vishay General Semiconductor - Diodes Division, meets all critical voltage and package specifications. This part maintains identical standoff voltage, breakdown voltage, and clamping voltage characteristics. Both components are housed in the DO-214AC (SMA) surface mount package and operate across the same temperature range with equivalent compliance certifications. The substitute part is classified as a manufacturer-recommended equivalent.

Parameter Comparison

Parameter	P4SMA170A (Littelfuse)	P4SMA170A-E3/61 (Vishay)	Compatibility
Voltage - Reverse Standoff (Typ)	145V	145V	Equivalent
Voltage - Breakdown (Min)	162V	162V	Equivalent
Voltage - Clamping (Max) @ Ipp	234V	234V	Equivalent
Current - Peak Pulse (10/1000µs)	1.8A	1.3A	Substitute rated lower
Power - Peak Pulse	400W	300W	Substitute rated lower
Operating Temperature Range	-65 to 150°C (TJ)	-65 to 150°C (TJ)	Equivalent
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Packaging Format	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Different format

Engineering Selection Recommendations

Both the P4SMA170A and P4SMA170A-E3/61 are active products with ROHS3 compliance and REACH unaffected status. Selection between these components is based on application-specific current and power requirements.

The P4SMA170A (Littelfuse) is specified for applications requiring the full 1.8A peak pulse current and 400W peak pulse power rating. This component is suitable for high-energy transient suppression scenarios.

The P4SMA170A-E3/61 (Vishay) is specified for applications where peak pulse current does not exceed 1.3A and peak pulse power does not exceed 300W. This substitute part maintains voltage protection characteristics identical to the primary part while operating within reduced current and power envelopes. Both components share identical voltage standoff, breakdown, and clamping specifications, ensuring equivalent protection thresholds in circuit applications.

Packaging format differs between the two parts: the primary part is supplied in Cut Tape (CT) and Digi-Reel® format, while the substitute is supplied in Tape & Reel (TR) format. This distinction affects procurement and assembly logistics but does not impact electrical performance or circuit compatibility.

Frequently Asked Questions (FAQ)

Q: Can the P4SMA170A-E3/61 be used as a direct replacement for the P4SMA170A?

A: The P4SMA170A-E3/61 is electrically compatible for applications where peak pulse current requirements do not exceed 1.3A and peak pulse power does not exceed 300W. Both parts maintain identical voltage protection characteristics (145V standoff, 162V breakdown, 234V clamping). If your application requires the full 1.8A peak pulse current or 400W peak pulse power rating, the P4SMA170A is the appropriate selection.

Q: Are the package and mounting specifications identical?

A: Both parts use the DO-214AC (SMA) surface mount package and are compatible with identical PCB footprints and reflow soldering processes. The difference lies in supply packaging: the P4SMA170A is supplied in Cut Tape (CT) and Digi-Reel® format, while the P4SMA170A-E3/61 is supplied in Tape & Reel (TR) format. This affects procurement and assembly handling but not circuit performance.

Q: What compliance certifications apply to both parts?

A: Both the P4SMA170A and P4SMA170A-E3/61 are ROHS3 compliant and REACH unaffected. Both maintain Moisture Sensitivity Level 1 (unlimited), indicating no moisture sensitivity constraints during storage or handling.

Q: What is the operating temperature range for both parts?

A: Both parts operate across the identical temperature range of -65°C to 150°C (junction temperature, TJ), ensuring equivalent thermal performance in industrial and commercial applications.

Q: How do the power ratings differ between these parts?

A: The P4SMA170A is rated for 400W peak pulse power with 1.8A peak pulse current. The P4SMA170A-E3/61 is rated for 300W peak pulse power with 1.3A peak pulse current. Selection depends on the magnitude of transient energy your circuit must suppress. Applications with lower transient energy can use the substitute part; applications with higher transient energy require the primary part.

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