PM43-560K Equivalent & Substitute Parts

Part Overview

The PM43-560K is a 56 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 420 mA with 937mOhm DC resistance. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across -40°C to 100°C and is packaged in a nonstandard surface mount configuration measuring 4.50mm × 4.00mm × 4.60mm (max height).

Key Parameters

Parameter	Value
Inductance	56 µH
Tolerance	±10%
Current Rating	420 mA
DC Resistance (DCR)	937mOhm
Core Material	Ferrite
Shielding	Unshielded
Operating Temperature Range	-40°C ~ 100°C
Mounting Type	Surface Mount
Physical Dimensions	4.50mm L × 4.00mm W × 4.60mm H (max)

Substitute Part Grouping Explanation

Substitution eligibility for the PM43-560K is determined by the following critical parameters: inductance value (56 µH), tolerance (±10%), core material (ferrite), shielding type (unshielded), physical footprint (4.50mm × 4.00mm × 4.60mm max height), and surface mount packaging. Current rating and DC resistance are secondary considerations; parts with equal or higher current ratings and comparable DCR values are acceptable substitutes provided all primary parameters match.

The substitute parts are grouped into two categories:

Direct Upgrade (Active Status): PM43-560K-RC offers improved specifications with higher current rating (500 mA vs 420 mA) and active product status, making it the preferred replacement.

Cross-Manufacturer Alternatives (Active Status): SDR0403-560KL, CD43NP-560KC, and CR43NP-560KC provide equivalent electrical performance with identical inductance, tolerance, and core specifications. These parts maintain compatibility with the original footprint and operating temperature range.

Parameter Comparison

Parameter	PM43-560K	PM43-560K-RC	SDR0403-560KL	CD43NP-560KC	CR43NP-560KC
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Sumida America Components Inc.	Sumida America Components Inc.
Inductance	56 µH	56 µH	56 µH	56 µH	56 µH
Tolerance	±10%	±10%	±10%	±10%	±10%
Current Rating (Amps)	420 mA	500 mA	500 mA	420 mA	420 mA
DC Resistance (DCR)	937mOhm	940mOhm	940mOhm Max	937mOhm Max	937mOhm 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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Physical Dimensions (L × W × H max)	4.50mm × 4.00mm × 4.60mm	4.50mm × 4.00mm × 4.60mm	4.50mm × 4.00mm × 4.60mm	4.50mm × 4.00mm × 4.60mm	4.80mm × 4.30mm × 4.60mm
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: PM43-560K-RC

The PM43-560K-RC is the direct manufacturer upgrade from Bourns Inc. with active product status and ROHS3 compliance. It maintains identical inductance, tolerance, and physical footprint while providing enhanced current rating (500 mA vs 420 mA) and extended operating temperature range (-40°C to 125°C). This part is suitable for all applications previously using the PM43-560K.

Secondary Recommendations: SDR0403-560KL, CD43NP-560KC, CR43NP-560KC

These cross-manufacturer alternatives provide equivalent electrical specifications with active product status and ROHS3 compliance. SDR0403-560KL and CD43NP-560KC maintain the original 4.50mm × 4.00mm footprint. CR43NP-560KC has a slightly larger footprint (4.80mm × 4.30mm) and requires PCB layout verification before implementation.

All substitute parts are unshielded ferrite core inductors with 56 µH inductance and ±10% tolerance, ensuring functional compatibility with the original PM43-560K design.

Frequently Asked Questions (FAQ)

Q: Can PM43-560K-RC be used as a direct replacement for PM43-560K?

A: Yes. PM43-560K-RC is the active equivalent with identical inductance (56 µH), tolerance (±10%), and physical dimensions (4.50mm × 4.00mm × 4.60mm max height). The higher current rating (500 mA vs 420 mA) and extended temperature range (-40°C to 125°C) provide improved performance margins.

Q: What is the difference between PM43-560K-RC and SDR0403-560KL?

A: Both parts share identical electrical specifications (56 µH, ±10%, 500 mA, 940mOhm DCR) and physical footprint. PM43-560K-RC is from Bourns Inc. series PM43, while SDR0403-560KL is from Bourns Inc. series SDR0403. Selection depends on supply chain availability and internal design documentation requirements.

Q: Are CD43NP-560KC and CR43NP-560KC suitable substitutes?

A: CD43NP-560KC and CR43NP-560KC are manufactured by Sumida America Components Inc. and provide equivalent electrical performance (56 µH, ±10%, 420 mA, 937mOhm DCR). CD43NP-560KC maintains the original 4.50mm × 4.00mm footprint. CR43NP-560KC has a larger footprint (4.80mm × 4.30mm) and requires PCB layout verification.

Q: What compliance certifications apply to substitute parts?

A: PM43-560K-RC, SDR0403-560KL, CD43NP-560KC, and CR43NP-560KC are all ROHS3 compliant. The original PM43-560K is RoHS non-compliant. All parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: Can I use parts with higher current ratings as substitutes?

A: Yes. PM43-560K-RC and SDR0403-560KL both have 500 mA current ratings compared to the original 420 mA specification. Higher current ratings provide additional design margin and are acceptable for applications designed for the PM43-560K.

Q: What is the packaging format for these substitute parts?

A: PM43-560K-RC, SDR0403-560KL, CD43NP-560KC, and CR43NP-560KC are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.

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