PM42S-2R7 Equivalent & Substitute Parts

Part Overview

The PM42S-2R7 is a 2.7 µH shielded drum core, wirewound inductor manufactured by Bourns Inc., rated for 1.28 A with a maximum DC resistance of 105mOhm. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design requirements and procurement needs. The part operates across a temperature range of -30°C to 100°C and is mounted as a surface mount device in a nonstandard package measuring 4.80mm x 4.80mm.

Substiute Parts

PM42S-2R7

Bourns Inc.In Stock: 1168PM42S-2R7 Datasheet

Current PartRFQ

SRR4018-2R7Y

Bourns Inc.In Stock: 2007SRR4018-2R7Y Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRR4018-2R7Y qualifies as a direct substitute for the PM42S-2R7 based on the following critical parameters:

Inductance value matches exactly at 2.7 µH with identical ±30% tolerance. Both components utilize ferrite shielded drum core construction with identical physical dimensions (4.80mm x 4.80mm x 2.00mm maximum height), ensuring mechanical and electrical compatibility in existing PCB layouts. The SRR4018-2R7Y maintains the same surface mount configuration and operates within compatible temperature ranges. The substitute part exceeds the current rating requirement (2.03 A versus 1.28 A) and provides superior DC resistance performance (60mOhm Max versus 105mOhm Max), making it functionally superior while maintaining backward compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SRR4018-2R7Y is the qualified substitute for PM42S-2R7 applications. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity. The SRR4018-2R7Y achieves ROHS3 compliance, addressing regulatory requirements that the obsolete PM42S-2R7 does not meet. Both components share identical inductance specifications, tolerance, core construction, and physical footprint, enabling direct replacement without PCB redesign. The SRR4018-2R7Y provides enhanced electrical performance through reduced DC resistance and increased current rating capacity, delivering superior thermal and electrical characteristics within the same package envelope.

Frequently Asked Questions (FAQ)

Q: Can the SRR4018-2R7Y replace the PM42S-2R7 in existing designs?

A: Yes. Both inductors share identical inductance values (2.7 µH), tolerance (±30%), core construction (ferrite shielded drum core), and physical dimensions (4.80mm x 4.80mm x 2.00mm). The SRR4018-2R7Y is a direct mechanical and electrical substitute suitable for PCB assembly without layout modifications.

Q: What are the key differences between these parts?

A: The SRR4018-2R7Y provides improved electrical performance with 60mOhm maximum DC resistance compared to 105mOhm in the PM42S-2R7, and supports higher current ratings (2.03 A versus 1.28 A). The substitute part is active production status with ROHS3 compliance, whereas the PM42S-2R7 is obsolete and RoHS non-compliant.

Q: Are there packaging differences?

A: The PM42S-2R7 uses a nonstandard package designation, while the SRR4018-2R7Y is specified as 1919 (4848 Metric) package. Both maintain identical physical dimensions and surface mount configuration, ensuring footprint compatibility.

Q: Does the extended operating temperature range of the SRR4018-2R7Y affect compatibility?

A: No. The SRR4018-2R7Y operating range (-40°C ~ 125°C) encompasses the PM42S-2R7 range (-30°C ~ 100°C), providing equal or superior performance across all specified operating conditions.

Q: What is the impact of lower DC resistance in the substitute part?

A: Lower DC resistance (60mOhm versus 105mOhm) reduces power dissipation and heat generation in the inductor, improving overall circuit efficiency and thermal performance while maintaining electrical compatibility.