PM20-R27M Equivalent & Substitute Parts

Part Overview

The PM20-R27M is a 270 nH unshielded molded inductor manufactured by Bourns Inc., rated for 450 mA with a maximum DC resistance of 360 mOhm. This component operates across the temperature range of -55°C to 125°C in a 1210 (3225 Metric) surface mount package. The part is currently obsolete, necessitating identification of functionally equivalent alternatives from active product lines that maintain the same electrical and mechanical specifications.

Substiute Parts

PM20-R27M

Bourns Inc.In Stock: 839PM20-R27M Datasheet

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CM322522-R27KL

Bourns Inc.In Stock: 1212CM322522-R27KL Datasheet

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CM322522-R27ML

Bourns Inc.In Stock: 804CM322522-R27ML Datasheet

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1210-271K

API Delevan Inc.In Stock: 9921210-271K Datasheet

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AISM-1210-R27M-T

Abracon LLCIn Stock: 898AISM-1210-R27M-T Datasheet

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IMC1210EBR27M

Vishay DaleIn Stock: 725IMC1210EBR27M Datasheet

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IMC1210ERR27M

Vishay DaleIn Stock: 1013IMC1210ERR27M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PM20-R27M is determined by strict equivalence across the following critical parameters: inductance value (270 nH), package form factor (1210 / 3225 Metric), current rating capability (minimum 450 mA), maximum DC resistance (360 mOhm), shielding configuration (unshielded), and operating temperature range compatibility. Parts meeting these criteria are classified as direct substitutes regardless of core material type (ferrite, iron, or iron powder) or construction method (molded or drum core wirewound), as these variations do not affect functional performance within the specified electrical envelope.

The substitute parts identified maintain the 270 nH inductance specification with tolerance ratings of ±10% or ±20%, current ratings from 345 mA to 759 mA, and DC resistance at or below 360 mOhm maximum. All candidates are surface mount components in the 1210 package with unshielded construction and self-resonant frequencies at or above 210 MHz.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring full compatibility with the original PM20-R27M specification, the IMC1210EBR27M and IMC1210ERR27M from Vishay Dale are direct functional equivalents. Both parts maintain identical inductance (270 nH), current rating (456 mA exceeds the 450 mA requirement), DC resistance (360 mOhm maximum), package form factor (1210), and operating temperature range (-55°C to 125°C). These parts are active products with ROHS3 compliance and differ only in packaging format (bulk versus tape & reel).

The AISM-1210-R27M-T from Abracon LLC provides an alternative with matching inductance, tolerance, current rating, and DC resistance in the 1210 package. This part is ROHS3 compliant and active. The operating temperature range is restricted to -40°C to 85°C, which may limit suitability for applications requiring the full -55°C to 125°C envelope.

The 1210-271K from API Delevan Inc. maintains the full temperature range (-55°C to 125°C) and package specification with superior current rating capability (759 mA). This part is active but remains RoHS non-compliant, matching the compliance status of the original PM20-R27M.

The CM322522-R27KL and CM322522-R27ML from Bourns Inc. are active alternatives with improved tolerance (±10% for the KL variant) and lower DC resistance (320 mOhm). However, both use a nonstandard package form factor and reduced current rating (345 mA), which may present mechanical and thermal constraints in designs optimized for the 1210 package and 450 mA specification.

Frequently Asked Questions (FAQ)

Q: Can the CM322522 series parts substitute for the PM20-R27M in existing PCB designs?

A: The CM322522-R27KL and CM322522-R27ML maintain the same inductance value and footprint dimensions (3.20mm x 2.50mm) but use a nonstandard package designation rather than the standard 1210 form factor. Physical compatibility depends on PCB pad layout and height clearance (2.20mm seated height). The reduced current rating (345 mA versus 450 mA) may require thermal analysis for applications operating near the original current limit.

Q: What is the difference between IMC1210EBR27M and IMC1210ERR27M?

A: Both parts are electrically and mechanically identical 270 nH inductors from Vishay Dale with 456 mA current rating and 360 mOhm maximum DC resistance. The primary distinction is packaging: IMC1210EBR27M is supplied in bulk format, while IMC1210ERR27M is supplied in tape & reel format. Selection depends on assembly process requirements and volume considerations.

Q: Does the AISM-1210-R27M-T operate across the full temperature range of the original part?

A: The AISM-1210-R27M-T operates from -40°C to 85°C, which is narrower than the PM20-R27M specification of -55°C to 125°C. Applications requiring operation below -40°C or above 85°C must use alternative substitutes such as the IMC1210ERR27M or 1210-271K.

Q: Are there RoHS compliance differences between substitute options?

A: The IMC1210EBR27M, IMC1210ERR27M, AISM-1210-R27M-T, and CM322522 series parts are ROHS3 compliant. The 1210-271K from API Delevan Inc. maintains RoHS non-compliant status, matching the original PM20-R27M. Design requirements for RoHS compliance will determine which substitutes are acceptable.

Q: How do core material differences affect part selection?

A: The PM20-R27M uses ferrite core material. Substitute parts employ ferrite, iron, or iron powder cores. All candidates maintain the specified 270 nH inductance, 360 mOhm maximum DC resistance, and 320 MHz self-resonant frequency. Core material variation does not affect functional performance within the electrical specification envelope and may be selected based on availability, compliance requirements, or packaging preferences.