PM20-2R2K Equivalent & Substitute Parts

Part Overview

The PM20-2R2K is a 2.2 µH unshielded molded inductor manufactured by Bourns Inc., rated for 320 mA with a maximum DC resistance of 1Ohm. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part operates across a temperature range of -55°C to 125°C and is packaged in the 1210 (3225 Metric) surface mount form factor.

Key Parameters

Parameter	Value
Inductance	2.2 µH
Tolerance	±10%
Current Rating	320 mA
DC Resistance (DCR)	1Ohm Max
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Shielding	Unshielded
Material - Core	Ferrite
Q @ Freq	30 @ 7.96MHz

Substitute Part Grouping Explanation

Substitution eligibility for the PM20-2R2K is determined by the following critical parameters:

Inductance value: 2.2 µH (exact match required)
Package / Case: 1210 (3225 Metric) surface mount form factor
Core material: Ferrite unshielded construction
Current rating: Must support minimum 320 mA operation
DC resistance: Maximum 1Ohm
Operating temperature range: Must encompass or match -55°C ~ 125°C
Frequency characteristics: Q factor and self-resonant frequency at test frequency 7.96 MHz

Four substitute parts meet these criteria with varying compliance and availability profiles.

Parameter Comparison

Parameter	PM20-2R2K	CM322522-2R2JL	CM322522-2R2KL	1210-222J	74476402
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	API Delevan Inc.	Würth Elektronik
Inductance	2.2 µH	2.2 µH	2.2 µH	2.2 µH	2.2 µH
Tolerance	±10%	±5%	±10%	±5%	±10%
Current Rating (Amps)	320 mA	190 mA	190 mA	431 mA	320 mA
DC Resistance (DCR)	1Ohm Max	950mOhm Max	950mOhm Max	1Ohm Max	1Ohm Max
Package / Case	1210 (3225 Metric)	Nonstandard	Nonstandard	1210 (3225 Metric)	1210 (3225 Metric)
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 105°C
Q @ Freq	30 @ 7.96MHz	30 @ 7.96MHz	30 @ 7.96MHz	30 @ 7.9MHz	30 @ 7.96MHz
Frequency - Self Resonant	75MHz	80MHz	80MHz	70MHz	100MHz
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

CM322522-2R2KL is the primary substitute for the PM20-2R2K. This part maintains identical inductance, tolerance, and DC resistance specifications while offering ROHS3 compliance and active product status. The nonstandard package requires PCB layout verification for mechanical fit, though electrical footprint dimensions remain compatible. Operating temperature range is reduced to -40°C ~ 125°C, which is acceptable for most applications not requiring -55°C operation.

74476402 (Würth Elektronik) provides an alternative with identical current rating, DC resistance, and package form factor. This part is ROHS3 compliant and active. The operating temperature range is limited to -40°C ~ 105°C, making it unsuitable for applications requiring the full -55°C ~ 125°C range of the original part.

1210-222J (API Delevan Inc.) offers superior current rating (431 mA) and maintains the standard 1210 package and full temperature range (-55°C ~ 125°C). However, it is RoHS non-compliant, matching the compliance status of the original part. This option is suitable for legacy designs where RoHS compliance is not required.

CM322522-2R2JL is not recommended as a primary substitute due to reduced current rating (190 mA), which falls below the 320 mA requirement of the original design.

Frequently Asked Questions (FAQ)

Q: Can CM322522-2R2KL be used as a direct replacement for PM20-2R2K?

A: CM322522-2R2KL is electrically compatible with identical inductance (2.2 µH), tolerance (±10%), and DC resistance (1Ohm Max). The nonstandard package requires PCB layout verification. The reduced operating temperature minimum (-40°C vs -55°C) must be evaluated against application requirements.

Q: What is the difference between the two CM322522 variants?

A: CM322522-2R2JL has ±5% tolerance and CM322522-2R2KL has ±10% tolerance. Both have identical current rating (190 mA), which is below the 320 mA specification of PM20-2R2K, making both unsuitable for designs requiring full current capacity.

Q: Is 74476402 suitable for high-temperature applications?

A: 74476402 operates to 105°C maximum, which is 20°C below the original PM20-2R2K specification of 125°C. Applications requiring operation above 105°C must use alternative parts.

Q: Why is the 1210-222J current rating higher than the original part?

A: 1210-222J is rated for 431 mA, exceeding the 320 mA requirement. This higher rating does not affect substitution compatibility; the part can safely operate at or below 320 mA.

Q: Are there RoHS compliance considerations for this substitution?

A: PM20-2R2K is RoHS non-compliant. CM322522-2R2KL and 74476402 are ROHS3 compliant, offering improved environmental compliance. 1210-222J maintains RoHS non-compliant status, matching the original part.

Q: What package considerations apply to the CM322522 series?

A: CM322522-2R2JL and CM322522-2R2KL use nonstandard packages, requiring PCB footprint verification. Physical dimensions (0.126" L x 0.098" W, 3.20mm x 2.50mm) match the original, but height and mounting characteristics differ from standard 1210 packages.

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