PM20-1R2K Equivalent & Substitute Parts Reference

Part Overview

The PM20-1R2K is a 1.2 µH unshielded molded inductor manufactured by Bourns Inc., rated for 390 mA with a maximum DC resistance of 750mOhm. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part is housed in a 1210 (3225 Metric) surface mount package and operates across a temperature range of -55°C to 125°C.

Substiute Parts

PM20-1R2K

Bourns Inc.In Stock: 1150PM20-1R2K Datasheet

Current PartRFQ

CM322522-1R2JL

Bourns Inc.In Stock: 1120CM322522-1R2JL Datasheet

SimilarRFQ

CM322522-1R2KL

Bourns Inc.In Stock: 10698CM322522-1R2KL Datasheet

SimilarRFQ

1210-122J

API Delevan Inc.In Stock: 11461210-122J Datasheet

SimilarRFQ

744764012

Würth ElektronikIn Stock: 2731744764012 Datasheet

SimilarRFQ

IMC1210EB1R2K

Vishay DaleIn Stock: 1221IMC1210EB1R2K Datasheet

SimilarRFQ

IMC1210ER1R2K

Vishay DaleIn Stock: 732IMC1210ER1R2K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PM20-1R2K is determined by strict electrical and mechanical compatibility across the following critical parameters:

• Inductance Value: 1.2 µH (exact match required)
• Current Rating: Minimum 390 mA (equal or greater acceptable)
• DC Resistance: 750mOhm Max (equal or lower acceptable)
• Package / Case: 1210 (3225 Metric) surface mount (exact match required)
• Operating Temperature Range: Must support -55°C ~ 125°C minimum
• Shielding Configuration: Unshielded (as specified)

Substitute parts are grouped into two categories based on these parameters:

Category A - Direct Electrical & Mechanical Equivalents: Parts matching all critical parameters with identical or superior current ratings and equivalent or lower DCR values.

Category B - Functional Equivalents with Parameter Variations: Parts meeting inductance, package, and thermal requirements but with reduced current ratings or alternative core materials, suitable only where application current demands permit.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Full Compatibility)

IMC1210ER1R2K and IMC1210EB1R2K (Vishay Dale) provide direct electrical and mechanical equivalence to the PM20-1R2K. Both parts maintain the 390 mA current rating, 750mOhm maximum DCR, and 1210 package footprint. IMC1210ER1R2K is ROHS3 compliant and available in Tape & Reel packaging. IMC1210EB1R2K is available in Bulk packaging. The core material differs (Iron Powder vs. Ferrite), but electrical performance remains equivalent at the specified operating parameters. Both support the full -55°C to 125°C temperature range.

1210-122J (API Delevan Inc.) meets all critical electrical and mechanical requirements with superior current rating (497 mA vs. 390 mA) and tighter inductance tolerance (±5% vs. ±10%). This part maintains full temperature range compatibility (-55°C ~ 125°C) and is actively produced. RoHS compliance status is non-compliant, matching the original part classification.

744764012 (Würth Elektronik) provides electrical equivalence with identical current rating and DCR specifications in the 1210 package. This part is ROHS3 compliant and actively produced. The operating temperature range is reduced to -40°C ~ 105°C, which may limit use in applications requiring the full -55°C specification.

Secondary Substitutes (Reduced Current Rating)

CM322522-1R2JL and CM322522-1R2KL (Bourns Inc.) are functionally equivalent for applications where current demand does not exceed 215 mA. Both parts maintain 1.2 µH inductance and 750mOhm DCR. These parts are ROHS3 compliant and actively produced. The package classification is listed as Nonstandard, requiring physical verification for PCB footprint compatibility. Operating temperature range is -40°C ~ 125°C, which does not support the full -55°C lower specification of the original part.

Frequently Asked Questions (FAQ)

Q: Can CM322522-1R2JL or CM322522-1R2KL replace PM20-1R2K in all applications?

A: These parts are suitable only for applications where the circuit current requirement does not exceed 215 mA. The PM20-1R2K is rated for 390 mA. Additionally, the package is classified as Nonstandard; physical dimensions must be verified against your PCB layout before substitution. The minimum operating temperature is -40°C rather than -55°C.

Q: What is the difference between IMC1210ER1R2K and IMC1210EB1R2K?

A: Both parts are electrically and mechanically identical with 1.2 µH inductance, 390 mA current rating, and 750mOhm DCR. The primary difference is packaging: IMC1210ER1R2K is supplied in Tape & Reel format, while IMC1210EB1R2K is supplied in Bulk format. IMC1210ER1R2K carries ROHS3 compliance certification.

Q: Does 744764012 have any limitations compared to PM20-1R2K?

A: The 744764012 provides full electrical equivalence but operates within a reduced temperature range of -40°C ~ 105°C versus the original -55°C ~ 125°C specification. This part is suitable only for applications where the full temperature range is not required. The part is ROHS3 compliant.

Q: Why is 1210-122J listed as a substitute if it has a higher current rating?

A: Higher current rating indicates superior performance margin in the same package. The 1210-122J maintains all critical parameters: 1.2 µH inductance, 750mOhm DCR, 1210 package, and full -55°C ~ 125°C temperature range. The ±5% inductance tolerance is tighter than the original ±10%, providing better precision. This part is actively produced.

Q: Are there any RoHS compliance considerations for substitution?

A: The original PM20-1R2K is RoHS non-compliant. If your application requires RoHS3 compliance, IMC1210ER1R2K, 744764012, CM322522-1R2JL, and CM322522-1R2KL all meet ROHS3 standards. 1210-122J maintains RoHS non-compliant status, matching the original classification.

Q: Can I use these substitutes interchangeably on the same PCB?

A: All primary substitutes (IMC1210ER1R2K, IMC1210EB1R2K, 744764012, and 1210-122J) share the 1210 (3225 Metric) package footprint and are mechanically interchangeable. CM322522-1R2JL and CM322522-1R2KL have Nonstandard package classification and require physical dimension verification before PCB layout confirmation.