PM125SH-271M-RC Equivalent & Substitute Parts

Part Overview

The PM125SH-271M-RC is a 270 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.3 A continuous current with a maximum DC resistance of 450 mOhm. This surface mount component operates across the temperature range of -40°C to 125°C and is ROHS3 compliant. The part is currently active in production with 802 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this product category.

Substiute Parts

PM125SH-271M-RC

Bourns Inc.In Stock: 850PM125SH-271M-RC Datasheet

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SRR1208-271KL

Bourns Inc.In Stock: 3087SRR1208-271KL Datasheet

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SRR1260-271K

Bourns Inc.In Stock: 28729SRR1260-271K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM125SH-271M-RC are qualified based on the following criteria:

Primary Electrical Parameters: Inductance value (270 µH), current rating capability, saturation current, and DC resistance must remain within acceptable operating margins for the application.

Mechanical Compatibility: Surface mount package type and shielded drum core construction are required.

Environmental & Compliance: Operating temperature range (-40°C to 125°C), RoHS3 compliance, and moisture sensitivity level (MSL 1) must be maintained.

Core Material: Ferrite core construction is specified.

Two substitute parts meet these criteria: SRR1208-271KL and SRR1260-271K, both manufactured by Bourns Inc.

Parameter Comparison

Engineering Selection Recommendations

SRR1260-271K provides direct electrical and mechanical equivalence to the PM125SH-271M-RC. Both parts share identical inductance, current rating, DC resistance, Q factor, and self-resonant frequency specifications. Physical dimensions and height are identical. Both maintain ROHS3 compliance and MSL 1 rating. This part is suitable for direct substitution in applications requiring 1.3 A continuous current capacity.

SRR1208-271KL is qualified as a substitute only for applications where the current requirement does not exceed 950 mA. While this part maintains the 270 µH inductance value and shielded ferrite core construction, the reduced current rating (950 mA versus 1.3 A) and lower saturation current (1.25 A versus 1.2 A) limit its use to lower-power circuit configurations. The improved DC resistance (400 mOhm versus 450 mOhm) and tighter tolerance (±10% versus ±20%) may provide performance benefits in specific applications. Physical dimensions are slightly larger (12.70mm x 12.70mm) with increased height (8.50mm), requiring PCB layout verification. The lower self-resonant frequency (2 MHz versus 3.6 MHz) indicates different high-frequency behavior.

All substitute parts maintain active production status and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can SRR1208-271KL replace PM125SH-271M-RC in all applications?

A: No. SRR1208-271KL is rated for 950 mA continuous current, while PM125SH-271M-RC is rated for 1.3 A. Substitution is limited to circuits where the actual current demand does not exceed 950 mA. Exceeding this rating will cause the part to saturate prematurely.

Q: What is the difference between SRR1260-271K and PM125SH-271M-RC?

A: SRR1260-271K is electrically and mechanically equivalent to PM125SH-271M-RC. Both parts have identical inductance (270 µH), current rating (1.3 A), DC resistance (450 mOhm), and physical dimensions (12.50mm x 12.50mm x 6.50mm height). The primary difference is the series designation and manufacturing line.

Q: Are there physical size differences between these parts?

A: Yes. PM125SH-271M-RC and SRR1260-271K share identical dimensions (12.50mm x 12.50mm footprint, 6.50mm height). SRR1208-271KL has a slightly larger footprint (12.70mm x 12.70mm) and greater height (8.50mm), requiring PCB layout verification before substitution.

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

A: Yes. PM125SH-271M-RC, SRR1208-271KL, and SRR1260-271K are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating and operate across -40°C to 125°C.

Q: What is the inductance tolerance difference between these parts?

A: PM125SH-271M-RC has ±20% tolerance, while both SRR1208-271KL and SRR1260-271K have ±10% tolerance. The tighter tolerance of the substitute parts may provide improved circuit performance in applications sensitive to inductance variation.

Q: How do the Q factors compare?

A: PM125SH-271M-RC and SRR1260-271K both have Q = 20 @ 796 kHz. SRR1208-271KL has Q = 13 @ 796 kHz, indicating lower quality factor and higher losses at this frequency.