P4SMA350A Equivalent & Substitute Parts

Part Overview

The P4SMA350A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component operates with a 300V reverse standoff voltage and provides 400W peak pulse power dissipation in a compact DO-214AC (SMA) package. The part is Active status and RoHS3 compliant, making it suitable for modern electronic designs requiring transient suppression across a wide operating temperature range of -65°C to 150°C.

Equivalent and substitute parts are identified based on matching electrical performance parameters including reverse standoff voltage, clamping voltage, peak pulse current, and power dissipation ratings, combined with compatible surface-mount packaging and compliance certifications.

Substiute Parts

P4SMA350A

Littelfuse Inc.In Stock: 20205P4SMA350A Datasheet

Current PartRFQ

P4SMA350A

Eaton - Electronics DivisionIn Stock: 20167P4SMA350A Datasheet

MFR RecommendedRFQ

P4SMA350A

Eaton - Electronics DivisionIn Stock: 20167P4SMA350A Datasheet

MFR RecommendedRFQ

SMAJ300A

MeritekIn Stock: 3720SMAJ300A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4SMA350A are qualified based on the following electrical and mechanical criteria:

• Voltage Rating Match: Reverse standoff voltage of 300V (±tolerance within specification)
• Clamping Performance: Clamping voltage at peak pulse current within 482V ±4V range
• Peak Pulse Current: 820–900mA range to maintain equivalent transient suppression capability
• Power Dissipation: 400W peak pulse power rating
• Package Compatibility: DO-214AC (SMA) surface-mount package
• Unidirectional Configuration: Single-channel Zener TVS diode topology
• Compliance: RoHS and REACH compliance status

Two substitute parts meet these criteria:

1. P4SMA350A (Eaton - Electronics Division): Identical electrical specifications and package, with operating temperature range of -55°C to 150°C
2. SMAJ300A (Meritek): Equivalent voltage rating and power dissipation with 486V clamping voltage and 820mA peak pulse current, operating temperature -55°C to 150°C

Parameter Comparison

Engineering Selection Recommendations

P4SMA350A (Eaton - Electronics Division) is the primary substitute for the Littelfuse P4SMA350A. Both parts share identical electrical specifications, package configuration, and series designation. The Eaton variant operates across a narrower temperature range (-55°C to 150°C versus -65°C to 150°C), which is acceptable for most applications not requiring extended low-temperature performance. Both parts maintain RoHS compliance and unlimited moisture sensitivity rating.

SMAJ300A (Meritek) serves as a secondary substitute when the primary options are unavailable. This part maintains the 300V reverse standoff voltage and 400W power dissipation but exhibits a 4V higher clamping voltage (486V versus 482V) and 80mA lower peak pulse current (820mA versus 900mA). These variations remain within acceptable tolerance for general-purpose transient suppression applications. The SMAJ300A is ROHS3 compliant and REACH unaffected, matching the compliance profile of the original part.

Selection between these substitutes should be based on availability, supply chain requirements, and application-specific temperature operating conditions. All three parts are qualified for surface-mount assembly in DO-214AC (SMA) packages and are suitable for direct PCB replacement without design modification.

Frequently Asked Questions (FAQ)

Q: Can the P4SMA350A (Eaton) be used as a direct replacement for the Littelfuse P4SMA350A?

A: Yes. Both parts are electrically identical with matching reverse standoff voltage (300V), clamping voltage (482V), peak pulse current (900mA), and power dissipation (400W). The only difference is the operating temperature range: Eaton operates from -55°C to 150°C while Littelfuse operates from -65°C to 150°C. For applications within the -55°C to 150°C range, direct substitution is valid.

Q: What are the limitations of using SMAJ300A as a substitute?

A: The SMAJ300A maintains the critical 300V reverse standoff voltage and 400W power rating but differs in two parameters: clamping voltage is 4V higher (486V versus 482V) and peak pulse current is 80mA lower (820mA versus 900mA). These variations are within typical design margins for general-purpose transient suppression. Applications with strict clamping voltage or current requirements should verify compatibility before substitution.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. All three parts use the DO-214AC (SMA) surface-mount package, ensuring identical PCB footprint and assembly compatibility. No layout or design changes are required for substitution.

Q: Do all substitute parts meet the same compliance requirements?

A: All three parts are RoHS compliant and REACH unaffected. The Littelfuse and Meritek variants are ROHS3 compliant, while the Eaton variant is RoHS compliant. All maintain MSL 1 (Unlimited) moisture sensitivity rating, suitable for standard storage and handling conditions.

Q: Which substitute should be selected for low-temperature applications below -55°C?

A: The Littelfuse P4SMA350A is the only option rated to -65°C. If operation below -55°C is required, the original Littelfuse part must be used. Both Eaton and Meritek variants are limited to -55°C minimum operating temperature.