PM54-270M Equivalent & Substitute Parts

Part Overview

The PM54-270M is a 27 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 970 mA with 200mOhm DC resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across -30°C to 100°C and is mounted as a surface mount nonstandard package component.

Key Parameters

Parameter	Value
Inductance	27 µH
Inductance Tolerance	±20%
Current Rating	970 mA
DC Resistance (DCR)	200mOhm
Core Material	Ferrite
Shielding	Unshielded
Operating Temperature Range	-30°C ~ 100°C
Mounting Type	Surface Mount
Physical Dimensions	5.80mm x 5.80mm x 4.80mm (max height)
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the PM54-270M is determined by the following critical parameters:

Inductance Value: Must be 27 µH
Core Material: Must be ferrite
Shielding Configuration: Must be unshielded
Mounting Type: Must be surface mount
Physical Footprint: Must accommodate 5.80mm x 5.80mm base dimensions with maximum height of 4.80mm
Current Rating: Must support minimum 970 mA operation
DC Resistance: Must not exceed 200mOhm nominal specification

Substitute parts are grouped into two categories:

Direct Substitutes (PM54-270M-RC, SDR0604-270YL): Parts meeting all electrical parameters with enhanced current ratings (1 A) and improved product status (active, RoHS3 compliant).

Similar Substitutes (CD54NP-270MC, CR54NP-270MC, PD54R-273K): Parts from alternative manufacturers matching the core electrical specifications (27 µH, 970 mA, 200mOhm DCR) with active product status and RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating	DCR	Operating Temp	Product Status	RoHS Status	Dimensions (L x W x H)
PM54-270M	Bourns Inc.	27 µH	±20%	970 mA	200mOhm	-30°C ~ 100°C	Obsolete	Non-compliant	5.80 x 5.80 x 4.80mm
PM54-270M-RC	Bourns Inc.	27 µH	±20%	1 A	220mOhm	-40°C ~ 125°C	Active	RoHS3 Compliant	5.80 x 5.80 x 4.80mm
SDR0604-270YL	Bourns Inc.	27 µH	±15%	1 A	220mOhm Max	-40°C ~ 125°C	Active	RoHS3 Compliant	5.80 x 5.80 x 4.80mm
CD54NP-270MC	Sumida America Components Inc.	27 µH	±20%	970 mA	200mOhm Max	-40°C ~ 100°C	Active	RoHS3 Compliant	5.80 x 5.20 x 4.85mm
CR54NP-270MC	Sumida America Components Inc.	27 µH	±20%	970 mA	200mOhm Max	-40°C ~ 100°C	Active	RoHS3 Compliant	5.80 x 5.30 x 4.85mm
PD54R-273K	API Delevan Inc.	27 µH	±10%	1 A	240mOhm Max	-55°C ~ 125°C	Active	RoHS3 Compliant	5.70 x 5.11 x 4.50mm

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: PM54-270M-RC, SDR0604-270YL, CD54NP-270MC, CR54NP-270MC, and PD54R-273K all meet RoHS3 compliance, whereas the original PM54-270M does not.

For Active Product Status: All substitute parts listed maintain active product status, ensuring long-term availability and supply chain continuity compared to the obsolete PM54-270M.

For Bourns Inc. Continuity: PM54-270M-RC and SDR0604-270YL provide direct manufacturer continuity from Bourns Inc. with enhanced specifications and active status.

For Exact Current Rating Match: CD54NP-270MC and CR54NP-270MC maintain the original 970 mA current rating specification, while PM54-270M-RC, SDR0604-270YL, and PD54R-273K provide 1 A ratings with improved thermal headroom.

For Extended Temperature Range: PD54R-273K offers the widest operating temperature range (-55°C ~ 125°C) and tightest inductance tolerance (±10%), suitable for demanding thermal environments.

Frequently Asked Questions (FAQ)

Q: Can PM54-270M-RC directly replace PM54-270M in existing designs?

A: Yes. PM54-270M-RC maintains identical inductance (27 µH), tolerance (±20%), and physical footprint (5.80 x 5.80mm). The higher current rating (1 A vs 970 mA) and improved DCR specification (220mOhm) provide enhanced performance margins. Operating temperature range extends from -30°C to -40°C minimum, expanding operational capability.

Q: What is the difference between PM54-270M-RC and SDR0604-270YL?

A: Both are Bourns Inc. products with identical inductance, current rating, and physical dimensions. SDR0604-270YL offers tighter inductance tolerance (±15% vs ±20%) and belongs to the SDR0604 series. PM54-270M-RC maintains the PM54 series designation. Selection depends on series compatibility requirements in your design.

Q: Are the Sumida parts (CD54NP-270MC, CR54NP-270MC) suitable replacements?

A: Yes, both Sumida parts match the original 27 µH inductance, 970 mA current rating, and 200mOhm DCR specification. Physical dimensions vary slightly (width and height within 0.1mm tolerance). Both are RoHS3 compliant and active products. Verify PCB layout compatibility due to minor dimensional differences.

Q: How does PD54R-273K compare to the original PM54-270M?

A: PD54R-273K (API Delevan Inc.) provides 27 µH inductance with tighter tolerance (±10%), 1 A current rating, and extended temperature range (-55°C ~ 125°C). DCR is 240mOhm maximum, slightly higher than the original 200mOhm. Physical dimensions are marginally smaller (5.70 x 5.11 x 4.50mm). Suitable for applications requiring improved temperature performance and tolerance specifications.

Q: What packaging format is available for these substitutes?

A: All substitute parts are supplied in Tape & Reel (TR) packaging for automated assembly. The original PM54-270M packaging format is not specified in available data.

Q: Are there any compliance differences between substitute options?

A: The original PM54-270M is RoHS non-compliant. All substitute parts (PM54-270M-RC, SDR0604-270YL, CD54NP-270MC, CR54NP-270MC, PD54R-273K) are RoHS3 compliant. All parts are REACH unaffected and classified under ECCN EAR99.

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