PM43-390K-RC Equivalent & Substitute Parts

Part Overview

The PM43-390K-RC is a 39 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., designed for surface mount applications. This component is rated for 590 mA continuous current with a DC resistance of 590 mOhm and operates across the temperature range of -40°C to 125°C. The part maintains active product status and is ROHS3 compliant, making it suitable for modern electronic assemblies requiring fixed inductance filtering and energy storage applications.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across different product series within the same manufacturer's portfolio.

Substiute Parts

PM43-390K-RC

Bourns Inc.In Stock: 1115PM43-390K-RC Datasheet

Current PartRFQ

SDR0403-390KL

Bourns Inc.In Stock: 2843SDR0403-390KL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The SDR0403-390KL qualifies as a direct substitute for the PM43-390K-RC based on the following critical parameters:

Electrical Equivalence:

• Identical inductance value: 39 µH
• Matching inductance tolerance: ±10%
• Equivalent current rating: 590 mA
• Identical saturation current: 920 mA
• Matching DC resistance specification: 590 mOhm
• Identical core material: Ferrite
• Matching shielding configuration: Unshielded
• Equivalent Q factor: 20 @ 2.52 MHz
• Identical self-resonant frequency: 14 MHz

Mechanical & Environmental Compatibility:

• Identical package dimensions: 4.50 mm × 4.00 mm × 4.60 mm
• Same mounting type: Surface Mount
• Matching operating temperature range: -40°C to 125°C
• Identical inductance test frequency: 1 kHz

Regulatory & Compliance Alignment:

• Both ROHS3 compliant
• Both MSL 1 rated
• Both REACH unaffected
• Both active product status

Parameter Comparison

Engineering Selection Recommendations

Both the PM43-390K-RC and SDR0403-390KL are active products from Bourns Inc. with full ROHS3 compliance and REACH unaffected status. The SDR0403-390KL offers equivalent electrical performance and identical mechanical compatibility, with the DC resistance specified as a maximum value rather than a nominal specification. Both components maintain MSL 1 ratings, indicating unlimited shelf life under standard storage conditions.

Selection between these parts should be based on availability, lead time, and supply chain requirements, as all critical electrical, mechanical, and regulatory parameters are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-390KL be used as a direct replacement for the PM43-390K-RC in existing designs?

A: Yes. Both components share identical inductance values, current ratings, DC resistance specifications, core materials, shielding configurations, package dimensions, and operating temperature ranges. No circuit redesign or PCB layout modification is required.

Q: Are there differences in the DC resistance specifications between these parts?

A: The PM43-390K-RC specifies DC resistance as 590 mOhm nominal, while the SDR0403-390KL specifies 590 mOhm maximum. Both values are equivalent for circuit design purposes, as the maximum specification encompasses the nominal value.

Q: Do both parts have the same moisture sensitivity level?

A: Yes. Both the PM43-390K-RC and SDR0403-390KL carry MSL 1 ratings, indicating unlimited moisture sensitivity level with no shelf life restrictions under standard storage conditions.

Q: Are the package dimensions identical for PCB layout compatibility?

A: Yes. Both components have identical dimensions of 4.50 mm length × 4.00 mm width × 4.60 mm maximum height, ensuring direct footprint compatibility on printed circuit boards.

Q: What is the regulatory compliance status for both parts?

A: Both the PM43-390K-RC and SDR0403-390KL are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99, meeting current environmental and export regulatory requirements.