PM40-R22M Equivalent & Substitute Parts

Part Overview

The PM40-R22M is a 220 nH unshielded molded inductor manufactured by Bourns Inc., rated for 450 mA with a maximum DC resistance of 320mOhm. This component is designed for surface mount applications in the 1812 (4532 Metric) package format. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain the same inductance value, package dimensions, and operating temperature range while meeting or exceeding electrical performance specifications.

Substiute Parts

PM40-R22M

Bourns Inc.In Stock: 961PM40-R22M Datasheet

Current PartRFQ

CM453232-R22KL

Bourns Inc.In Stock: 2431CM453232-R22KL Datasheet

DirectRFQ

CM453232-R22ML

Bourns Inc.In Stock: 24407CM453232-R22ML Datasheet

DirectRFQ

1812-221K

API Delevan Inc.In Stock: 14011812-221K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PM40-R22M is determined by the following critical parameters:

• Inductance Value: 220 nH (exact match required)
• Package Dimensions: 1812 (4532 Metric) surface mount format
• Shielding Type: Unshielded configuration
• Current Rating: Must equal or exceed 450 mA
• DC Resistance: Should not exceed 320mOhm for optimal performance
• Operating Temperature Range: Must support -55°C ~ 125°C minimum

Two categories of substitutes are identified:

Direct Substitutes (CM453232-R22KL, CM453232-R22ML): These parts maintain identical inductance, package, and shielding specifications while offering improved current ratings (665 mA) and lower DC resistance (250mOhm). Both are manufactured by Bourns Inc. in the active CM45 series.

Similar Substitute (1812-221K): This part from API Delevan Inc. matches the inductance, package, and operating temperature range but uses a different core material (Iron vs. Non-Magnetic/Ferrite) and has higher DC resistance (400mOhm).

Parameter Comparison

Engineering Selection Recommendations

CM453232-R22KL and CM453232-R22ML are the preferred direct substitutes for the PM40-R22M. Both parts are manufactured by Bourns Inc. and maintain active product status. These substitutes provide superior electrical performance with 665 mA current ratings and 250mOhm maximum DC resistance, representing improvements over the original specification. Both CM45 series parts are ROHS3 compliant, supporting modern environmental and regulatory requirements. CM453232-R22ML offers higher inventory availability (24,370 pcs) compared to CM453232-R22KL (2,409 pcs).

The primary trade-off with CM45 substitutes is the reduced self-resonant frequency (200MHz vs. 350MHz) and lower operating temperature minimum (-40°C vs. -55°C). These differences are acceptable for applications not requiring operation below -40°C or frequencies approaching 350MHz.

1812-221K from API Delevan Inc. is a viable alternative when CM45 series parts are unavailable. This part maintains the full operating temperature range (-55°C ~ 125°C) and self-resonant frequency (350MHz) of the original PM40-R22M. However, the 400mOhm maximum DC resistance exceeds the original specification and represents a performance compromise. The 1812-221K remains RoHS non-compliant, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can CM453232-R22KL and CM453232-R22ML be used interchangeably with PM40-R22M?

A: Yes. Both parts maintain the 220 nH inductance, 1812 package format, and unshielded configuration. The CM45 series parts exceed the original 450 mA current rating and provide lower DC resistance. The reduced operating temperature minimum (-40°C vs. -55°C) and self-resonant frequency (200MHz vs. 350MHz) must be verified against application requirements.

Q: What is the difference between CM453232-R22KL and CM453232-R22ML?

A: Both parts are electrically identical with 220 nH inductance, 665 mA current rating, and 250mOhm DC resistance. The primary difference is inductance tolerance: CM453232-R22KL specifies ±10% tolerance while CM453232-R22ML specifies ±20% tolerance, matching the original PM40-R22M. CM453232-R22ML has significantly higher inventory availability.

Q: Is 1812-221K a direct replacement for PM40-R22M?

A: 1812-221K is a functional substitute maintaining the same inductance, package, and full operating temperature range. However, the 400mOhm maximum DC resistance exceeds the original 320mOhm specification. This part is suitable when CM45 alternatives are unavailable and the higher DC resistance is acceptable for the application.

Q: Are there temperature range limitations with the CM45 substitutes?

A: CM453232-R22KL and CM453232-R22ML operate from -40°C to 125°C, compared to the original PM40-R22M range of -55°C to 125°C. Applications requiring operation below -40°C must use 1812-221K or verify that the reduced temperature range is acceptable.

Q: What are the RoHS compliance implications?

A: CM453232-R22KL and CM453232-R22ML are ROHS3 compliant, supporting modern environmental regulations. The original PM40-R22M and 1812-221K are RoHS non-compliant. For new designs or applications with RoHS requirements, the CM45 series substitutes are mandatory.

Q: How do the self-resonant frequencies compare?

A: PM40-R22M and 1812-221K both specify 350MHz self-resonant frequency. CM453232-R22KL and CM453232-R22ML specify 200MHz. For high-frequency applications approaching these limits, verify that the reduced self-resonant frequency of the CM45 series does not impact circuit performance.