PM43-470K Equivalent & Substitute Parts

Part Overview

The PM43-470K is a 47 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 440 mA with 844mOhm DC resistance. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part is surface mount packaged in a nonstandard 4.50mm × 4.00mm footprint with ±10% inductance tolerance and operates across -40°C to 100°C.

Substiute Parts

PM43-470K

Bourns Inc.In Stock: 1154PM43-470K Datasheet

Current PartRFQ

PM43-470K-RC

Bourns Inc.In Stock: 2570PM43-470K-RC Datasheet

DirectRFQ

SRR1806-471M

Bourns Inc.In Stock: 940SRR1806-471M Datasheet

DirectRFQ

SRR1806-680M

Bourns Inc.In Stock: 1575SRR1806-680M Datasheet

DirectRFQ

SDR0403-470KL

Bourns Inc.In Stock: 2825SDR0403-470KL Datasheet

SimilarRFQ

CD43NP-470KC

Sumida America Components Inc.In Stock: 6132CD43NP-470KC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters: inductance value (47 µH), tolerance (±10%), shielding configuration (unshielded), core material (ferrite), package footprint (4.50mm × 4.00mm), and current rating capability (minimum 440 mA). Parts are grouped into two categories:

Direct Substitutes maintain identical inductance, tolerance, shielding, and footprint while meeting or exceeding current rating specifications. These parts are pin-compatible and functionally equivalent.

Similar Substitutes share the same inductance, tolerance, shielding, and footprint but may have different current ratings or DC resistance values. These require circuit-level verification to confirm suitability.

Parameter Comparison

Engineering Selection Recommendations

PM43-470K-RC (Bourns Inc.) is the primary direct substitute. It maintains identical inductance (47 µH), tolerance (±10%), shielding (unshielded), and footprint (4.50mm × 4.00mm) while providing superior current rating (540 mA vs. 440 mA) and improved DC resistance (840mOhm vs. 844mOhm). The part is ROHS3 compliant and active in production, addressing the obsolescence of the original PM43-470K.

SDR0403-470KL (Bourns Inc., SDR0403 series) is functionally equivalent to PM43-470K-RC with identical electrical specifications and footprint. This part offers an alternative sourcing option with higher inventory availability (2800 pcs) and ROHS3 compliance.

CD43NP-470KC (Sumida America Components Inc., CD43 series) matches the original PM43-470K specifications exactly: 47 µH inductance, ±10% tolerance, 440 mA current rating, 844mOhm DCR, and identical footprint. This part is ROHS3 compliant and active, providing a direct replacement for legacy designs requiring exact parameter matching.

SRR1806-471M and SRR1806-680M are not suitable substitutes. These shielded inductors have different inductance values (470 µH and 68 µH respectively), larger footprints (18.30mm × 14.00mm), and different electrical characteristics. They cannot be used as direct replacements without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can PM43-470K-RC be used as a direct replacement for PM43-470K?

A: Yes. Both parts share identical inductance (47 µH), tolerance (±10%), shielding (unshielded), and package footprint (4.50mm × 4.00mm). PM43-470K-RC provides higher current rating (540 mA vs. 440 mA) and is ROHS3 compliant, making it suitable for direct substitution in new designs and production.

Q: What is the difference between PM43-470K-RC and SDR0403-470KL?

A: Both parts are electrically and mechanically equivalent with identical inductance, tolerance, current rating, DCR, and footprint. The primary difference is the manufacturer series designation (PM43 vs. SDR0403) and sourcing availability. Selection can be based on supply chain preference and inventory.

Q: Why are SRR1806 series parts listed as substitutes if they have different inductance values?

A: SRR1806-471M and SRR1806-680M are not suitable substitutes for PM43-470K. These parts have different inductance values (470 µH and 68 µH), larger physical footprints, and shielded construction. They were included in the original substitute list but do not meet substitution criteria and require circuit redesign if considered.

Q: Is CD43NP-470KC compatible with PM43-470K?

A: Yes. CD43NP-470KC (Sumida) matches all critical parameters of PM43-470K: 47 µH inductance, ±10% tolerance, 440 mA current rating, 844mOhm DCR, unshielded configuration, and identical footprint. This part is ROHS3 compliant and active in production.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: inductance value (47 µH), tolerance (±10%), shielding type (unshielded), core material (ferrite), package footprint (4.50mm × 4.00mm × 4.60mm height), and current rating capability (minimum 440 mA). Deviations in any of these parameters require circuit-level verification.

Q: Does the extended operating temperature range of PM43-470K-RC affect compatibility?

A: No. PM43-470K-RC operates from -40°C to 125°C, which encompasses the original PM43-470K range (-40°C to 100°C). The extended upper temperature limit provides additional design margin and does not compromise compatibility.

Q: Are there RoHS compliance considerations for substitution?

A: Yes. PM43-470K is RoHS non-compliant, while all active substitute parts (PM43-470K-RC, SDR0403-470KL, CD43NP-470KC) are ROHS3 compliant. New designs should prioritize ROHS3 compliant parts to meet current regulatory requirements.