PM20-470K Equivalent & Substitute Parts

Part Overview

The PM20-470K is a 47 µH unshielded molded inductor manufactured by Bourns Inc., rated for 60 mA with a maximum DC resistance of 7Ohm. This component operates across a temperature range of -55°C to 125°C in a 1210 (3225 Metric) surface mount package. The part is currently obsolete, necessitating identification of equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

PM20-470K

Bourns Inc.In Stock: 722PM20-470K Datasheet

Current PartRFQ

CM322522-470JL

Bourns Inc.In Stock: 20208CM322522-470JL Datasheet

DirectRFQ

CM322522-470KL

Bourns Inc.In Stock: 17420CM322522-470KL Datasheet

DirectRFQ

1210-473J

API Delevan Inc.In Stock: 8201210-473J Datasheet

SimilarRFQ

744764147

Würth ElektronikIn Stock: 3193744764147 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PM20-470K is determined by the following critical parameters:

• Inductance Value: Must be 47 µH (exact match required)
• DC Resistance: Must not exceed 7Ohm maximum
• Current Rating: Must meet or exceed 60 mA minimum requirement
• Package / Case: Must be 1210 (3225 Metric) or mechanically equivalent
• Mounting Type: Surface mount compatibility required
• Shielding: Unshielded configuration
• Operating Temperature: Must support the application's thermal requirements

Substitute parts are classified into two categories:

Direct Substitutes (CM322522-470JL, CM322522-470KL): Maintain identical inductance, DC resistance, and frequency characteristics. These Bourns components feature improved current ratings (75 mA) and active product status, offering enhanced performance margins.

Similar Substitutes (1210-473J, 744764147): Meet core electrical specifications with equivalent inductance, DC resistance, and package dimensions. These alternatives from API Delevan and Würth Elektronik provide active availability with varying current ratings and temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

For RoHS3 Compliant Applications: CM322522-470JL or CM322522-470KL are preferred selections. Both components are manufactured by Bourns Inc. with active product status and ROHS3 compliance certification. CM322522-470JL offers tighter tolerance (±5%) and is available in Tape & Reel packaging. CM322522-470KL provides equivalent electrical performance with ±10% tolerance and Cut Tape & Digi-Reel® packaging options.

For Extended Low-Temperature Operation (-55°C): 1210-473J from API Delevan Inc. maintains the full -55°C to 125°C operating range of the original PM20-470K. This component provides significantly higher current rating (163 mA) and active product status, though RoHS compliance is non-compliant.

For Thermal-Constrained Applications (≤105°C Maximum): 744764147 from Würth Elektronik matches the original current rating (60 mA) and operating temperature ceiling of 105°C. This component features ROHS3 compliance and active availability with identical electrical specifications.

For General Replacement with Performance Margin: CM322522-470KL offers the optimal balance of active status, regulatory compliance, and enhanced current rating (75 mA) while maintaining mechanical compatibility through equivalent package dimensions.

Frequently Asked Questions (FAQ)

Q: Can CM322522-470JL and CM322522-470KL be used interchangeably with PM20-470K?

A: Both components are direct electrical equivalents with identical inductance (47 µH), DC resistance (7Ohm max), and frequency characteristics (Q @ 2.52MHz, 15MHz self-resonant frequency). Physical dimensions are identical (0.126" L x 0.098" W, 0.087" max height). The primary differences are packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®) and tolerance specification (±5% vs. ±10%). Both are suitable for direct substitution in equivalent circuit positions.

Q: What is the significance of the "Nonstandard" package designation for CM322522 series parts?

A: The CM322522 series uses a Drum Core, Wirewound construction with nonstandard package geometry, despite maintaining identical external dimensions (3.20mm x 2.50mm) to the 1210 (3225 Metric) standard. This internal construction difference does not affect mechanical mounting or electrical performance in standard 1210 footprints.

Q: Why does 1210-473J have a higher current rating (163 mA) than the original PM20-470K (60 mA)?

A: The 1210-473J from API Delevan Inc. represents a different inductor design within the same package envelope. Higher current rating indicates improved thermal management and wire gauge optimization. This component can be used as a direct substitute when the application current requirement does not exceed 163 mA, providing additional performance margin.

Q: Are there temperature range limitations when substituting with 744764147?

A: The 744764147 from Würth Elektronik operates to a maximum of 105°C, compared to the original PM20-470K specification of 125°C. This component is suitable only for applications where the maximum operating temperature does not exceed 105°C. For applications requiring full 125°C operation, select CM322522-470JL, CM322522-470KL, or 1210-473J.

Q: Which substitute part offers the best regulatory compliance for new designs?

A: CM322522-470JL and CM322522-470KL both carry ROHS3 compliance certification. CM322522-470JL additionally features tighter inductance tolerance (±5%) and is recommended for applications requiring maximum regulatory alignment and component consistency.