PM43-150M Equivalent & Substitute Parts

Part Overview

The PM43-150M is a 15 µH unshielded drum core wirewound inductor rated for 850 mA with 235mOhm DC resistance, manufactured by Bourns Inc. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part is housed in a nonstandard surface mount package measuring 4.50mm × 4.00mm with a maximum seated height of 4.60mm.

Key Parameters

Parameter	Value
Inductance	15 µH
Tolerance	±20%
Current Rating	850 mA
DC Resistance (DCR)	235mOhm
Core Material	Ferrite
Shielding	Unshielded
Operating Temperature Range	-40°C ~ 100°C
Package Type	Surface Mount, Nonstandard
Physical Dimensions	4.50mm L × 4.00mm W × 4.60mm H
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the PM43-150M is determined by the following critical parameters: inductance value (15 µH), tolerance (±20%), core material (ferrite), shielding type (unshielded), package footprint (4.50mm × 4.00mm × 4.60mm), and surface mount compatibility. Current rating and DC resistance are secondary selection criteria that may vary within acceptable limits depending on circuit requirements.

The substitute parts are grouped into two categories:

Direct Upgrade (Active Status): PM43-150M-RC represents a direct successor from the same manufacturer series with improved specifications and active product status.

Cross-Manufacturer Equivalents (Active Status): SDR0403-150ML, CD43NP-150MC, and CR43NP-150MC provide functional equivalence from alternative manufacturers with active product availability.

Parameter Comparison

Parameter	PM43-150M	PM43-150M-RC	SDR0403-150ML	CD43NP-150MC	CR43NP-150MC
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Sumida America Components Inc.	Sumida America Components Inc.
Inductance	15 µH	15 µH	15 µH	15 µH	15 µH
Tolerance	±20%	±20%	±20%	±20%	±20%
Current Rating	850 mA	920 mA	920 mA	850 mA	850 mA
DC Resistance	235mOhm	240mOhm Max	240mOhm Max	235mOhm Max	235mOhm Max
Core Material	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Operating Temperature	-40°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 100°C	-40°C ~ 100°C
Package Dimensions	4.50mm × 4.00mm × 4.60mm	4.50mm × 4.00mm × 4.60mm	4.50mm × 4.00mm × 4.60mm	4.50mm × 4.00mm × 4.60mm	4.50mm × 4.00mm × 4.60mm
Product Status	Obsolete	Active	Active	Active	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

For RoHS3 Compliant Applications: PM43-150M-RC, SDR0403-150ML, CD43NP-150MC, and CR43NP-150MC are all ROHS3 compliant and suitable for modern production environments. The original PM43-150M is non-compliant and unsuitable for new designs subject to RoHS regulations.

For Active Product Availability: All substitute parts maintain active product status with current manufacturing and distribution. PM43-150M is obsolete and subject to supply discontinuation.

For Extended Temperature Range: PM43-150M-RC and SDR0403-150ML support -40°C to 125°C operating range, compared to -40°C to 100°C for the original part and CD43NP-150MC/CR43NP-150MC. Selection depends on thermal requirements of the application.

For Improved Current Handling: PM43-150M-RC and SDR0403-150ML provide 920 mA current rating versus 850 mA for the original part, offering additional design margin in current-limited applications.

For Cross-Manufacturer Flexibility: CD43NP-150MC and CR43NP-150MC from Sumida America Components Inc. provide equivalent specifications matching the original part's electrical characteristics while maintaining active status and RoHS compliance.

Frequently Asked Questions (FAQ)

Q: Can PM43-150M-RC directly replace PM43-150M in existing designs?

A: Yes. PM43-150M-RC maintains identical inductance (15 µH), tolerance (±20%), core material (ferrite), shielding (unshielded), and package footprint (4.50mm × 4.00mm × 4.60mm). The substitute offers improved current rating (920 mA vs. 850 mA), extended temperature range (-40°C to 125°C vs. -40°C to 100°C), and active product status with RoHS3 compliance.

Q: What are the differences between Bourns and Sumida substitute options?

A: PM43-150M-RC and SDR0403-150ML (Bourns) provide 920 mA current rating and 125°C maximum operating temperature. CD43NP-150MC and CR43NP-150MC (Sumida) match the original 850 mA current rating and 100°C maximum operating temperature. All four maintain identical inductance, tolerance, core material, shielding, and package dimensions.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Yes. PM43-150M-RC, SDR0403-150ML, CD43NP-150MC, and CR43NP-150MC are all supplied in Tape & Reel (TR) packaging suitable for automated assembly. The original PM43-150M was supplied in bulk packaging.

Q: Which substitute is recommended for new production designs?

A: PM43-150M-RC is the primary recommendation as the direct successor from the original manufacturer with active status, RoHS3 compliance, improved specifications, and established supply chain continuity. SDR0403-150ML serves as an alternative Bourns option with identical electrical performance.

Q: Do all substitutes maintain the same physical footprint?

A: Yes. All substitute parts share identical dimensions of 4.50mm length × 4.00mm width × 4.60mm maximum seated height, ensuring direct PCB layout compatibility without redesign.

Q: What is the impact of DC resistance variation between substitutes?

A: PM43-150M and CD43NP-150MC/CR43NP-150MC specify 235mOhm DCR, while PM43-150M-RC and SDR0403-150ML specify 240mOhm maximum. This 5mOhm difference is within the ±20% inductance tolerance band and has negligible impact on circuit performance in typical applications.

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