PM43-680K Equivalent & Substitute Parts

Part Overview

The PM43-680K is a 68 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 370 mA continuous current with 1.117Ω DC resistance. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. Substitute parts maintain the same inductance value and core geometry while offering improved electrical performance and active product status.

Substiute Parts

PM43-680K

Bourns Inc.In Stock: 814PM43-680K Datasheet

Current PartRFQ

PM43-680K-RC

Bourns Inc.In Stock: 1722PM43-680K-RC Datasheet

DirectRFQ

SDR0403-680KL

Bourns Inc.In Stock: 2484SDR0403-680KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Inductance Value: Must be 68 µH ±10%
• Core Material & Type: Ferrite drum core, unshielded construction
• Mounting Type: Surface mount configuration
• Physical Dimensions: 4.50mm × 4.00mm × 4.60mm (seated height)
• Current Handling: Minimum 370 mA continuous rating
• DC Resistance: Within acceptable operating range for the application

The PM43-680K-RC and SDR0403-680KL meet all substitution criteria. Both parts maintain identical inductance, core geometry, and physical footprint while providing enhanced electrical specifications and active product status.

Parameter Comparison

Engineering Selection Recommendations

PM43-680K-RC is the primary direct substitute. It is manufactured by Bourns Inc. under the same PM43 series, maintains identical physical footprint and inductance specifications, and provides 24% higher current rating (460 mA vs. 370 mA). The part is ROHS3 compliant and carries active product status, ensuring long-term availability and supply chain stability.

SDR0403-680KL is a functionally equivalent alternative from the SDR0403 series. It delivers identical electrical performance to the PM43-680K-RC while offering higher inventory availability. This part is also ROHS3 compliant and active. Selection between PM43-680K-RC and SDR0403-680KL depends on design documentation requirements and supply chain preferences, as both meet all electrical and mechanical substitution criteria.

Both substitute parts operate across an extended temperature range (-40°C to 125°C vs. -40°C to 100°C) and provide regulatory compliance advantages over the obsolete PM43-680K.

Frequently Asked Questions (FAQ)

Q: Can PM43-680K-RC be used as a direct replacement for PM43-680K?

A: Yes. Both parts share identical inductance (68 µH), tolerance (±10%), core type (ferrite drum core, unshielded), and physical dimensions (4.50mm × 4.00mm × 4.60mm). The PM43-680K-RC provides superior current handling (460 mA vs. 370 mA) and is ROHS3 compliant.

Q: What is the difference between PM43-680K-RC and SDR0403-680KL?

A: Both parts are electrically and mechanically equivalent with identical inductance, tolerance, current rating, DC resistance, and physical footprint. The primary difference is the product series designation (PM43 vs. SDR0403). Selection may be based on inventory availability or design documentation requirements.

Q: Are the substitute parts compatible with the original PCB layout?

A: Yes. Both PM43-680K-RC and SDR0403-680KL maintain the same surface mount package dimensions and footprint as the PM43-680K, requiring no PCB redesign.

Q: What is the significance of the higher current rating in substitute parts?

A: The substitute parts (460 mA rating) exceed the original part's 370 mA specification, providing design margin and improved reliability in applications operating near the original current limit.

Q: Why is RoHS compliance important for this substitution?

A: The PM43-680K is RoHS non-compliant, while both substitute parts are ROHS3 compliant. This compliance status is critical for applications subject to environmental regulations and may be required by end-use markets or procurement standards.

Q: Can these parts be used interchangeably in production?

A: Yes, provided design documentation and procurement specifications are updated to reflect the new part number. Both substitute parts meet all electrical and mechanical requirements for direct substitution.