PM20-2R7K Equivalent & Substitute Parts

Part Overview

The PM20-2R7K is a 2.7 µH unshielded molded inductor manufactured by Bourns Inc., rated for 290 mA with a maximum DC resistance of 1.1Ohm in a 1210 (3225 Metric) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -55°C to 125°C and is RoHS non-compliant.

Key Parameters

Parameter	Value
Inductance	2.7 µH
Current Rating	290 mA
DC Resistance (DCR)	1.1Ohm Max
Inductance Tolerance	±10%
Core Material	Ferrite
Shielding	Unshielded
Package / Case	1210 (3225 Metric)
Operating Temperature	-55°C ~ 125°C
Q @ Freq	30 @ 7.96MHz
Frequency - Self Resonant	70MHz
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the PM20-2R7K is determined by the following critical parameters:

Inductance Value: 2.7 µH (exact match required)
DC Resistance: 1.1Ohm Max (exact match required)
Core Material: Ferrite (exact match required)
Shielding: Unshielded (exact match required)
Current Rating: Minimum 290 mA (equal or higher acceptable)
Package / Case: 1210 (3225 Metric) or equivalent footprint
Operating Temperature Range: Must support -55°C ~ 125°C or equivalent
Mounting Type: Surface Mount (exact match required)

Substitute parts are grouped based on their ability to meet or exceed these parameters while maintaining electrical and mechanical compatibility.

Parameter Comparison

Parameter	PM20-2R7K (Main)	CM322522-2R7JL	CM322522-2R7KL	1210-272J	744764027
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	API Delevan Inc.	Würth Elektronik
Inductance	2.7 µH	2.7 µH	2.7 µH	2.7 µH	2.7 µH
Inductance Tolerance	±10%	±5%	±10%	±5%	±10%
Current Rating (Amps)	290 mA	180 mA	180 mA	411 mA	290 mA
DC Resistance (DCR)	1.1Ohm Max	1.1Ohm Max	1.1Ohm Max	1.1Ohm Max	1.1Ohm Max
Core Material	Ferrite	Ferrite	Ferrite	Ferrite	Ferrite
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
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	70MHz	75MHz	75MHz	65MHz	80MHz
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

744764027 (Würth Elektronik) is the primary substitute for the PM20-2R7K. This part matches the critical electrical parameters (2.7 µH inductance, 290 mA current rating, 1.1Ohm DCR) and maintains the 1210 (3225 Metric) package footprint. The part is ROHS3 compliant and currently in active production status with 2000 units in stock. The operating temperature range of -40°C ~ 105°C covers most industrial applications, though it does not extend to the full -55°C lower limit of the original part.

1210-272J (API Delevan Inc.) is an alternative substitute with superior current rating capability (411 mA), providing design margin for applications requiring higher current handling. This part maintains the 1210 (3225 Metric) package and supports the full -55°C ~ 125°C temperature range. However, it is RoHS non-compliant, matching the compliance status of the original PM20-2R7K.

CM322522-2R7JL and CM322522-2R7KL (Bourns Inc.) are not recommended as primary substitutes due to reduced current rating (180 mA versus 290 mA required) and nonstandard package designation, which may present PCB layout compatibility concerns despite matching physical dimensions.

Frequently Asked Questions (FAQ)

Q: Can CM322522-2R7JL or CM322522-2R7KL be used as direct replacements?

A: These parts share the same inductance value and DCR but have a current rating of 180 mA, which is below the 290 mA requirement of the PM20-2R7K. Use only if your circuit operates at or below 180 mA. The nonstandard package designation also requires verification of PCB footprint compatibility.

Q: What is the difference between 744764027 and 1210-272J?

A: Both are suitable substitutes with matching inductance and DCR. The 744764027 offers ROHS3 compliance and active production status. The 1210-272J provides higher current capacity (411 mA) and full temperature range support (-55°C ~ 125°C) but is RoHS non-compliant. Select based on compliance requirements and temperature range needs.

Q: Does the operating temperature range affect substitution?

A: Yes. The PM20-2R7K operates from -55°C ~ 125°C. The 744764027 operates from -40°C ~ 105°C, which may be limiting for extreme temperature applications. The 1210-272J supports the full -55°C ~ 125°C range. Verify your application's temperature requirements before selection.

Q: Are all substitutes available in the same package?

A: The 744764027 and 1210-272J use the standard 1210 (3225 Metric) package. The CM322522 series uses a nonstandard package with matching physical dimensions (0.126" L x 0.098" W). Verify PCB footprint compatibility for the CM322522 series before use.

Q: What is the significance of RoHS compliance?

A: The PM20-2R7K is RoHS non-compliant. The 744764027 and CM322522 series are ROHS3 compliant, suitable for applications requiring environmental compliance. The 1210-272J is RoHS non-compliant, matching the original part's status. Select based on your product's regulatory requirements.

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