PM40-220K Equivalent & Substitute Parts

Part Overview

The PM40-220K is a 22 µH unshielded molded inductor manufactured by Bourns Inc., rated for 180 mA with a maximum DC resistance of 3.2Ohm in a 1812 (4532 Metric) surface mount package. This component operates across a temperature range of -55°C to 125°C and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Inductance	22 µH
Current Rating	180 mA
DC Resistance (Max)	3.2Ohm
Package / Case	1812 (4532 Metric)
Shielding	Unshielded
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Tolerance	±10%

Substitute Part Grouping Explanation

Substitution for the PM40-220K is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid equivalency:

Primary Substitution Criteria:

Inductance value: 22 µH (exact match required)
Current rating: minimum 180 mA
DC resistance: maximum 3.2Ohm
Package: 1812 (4532 Metric) surface mount
Shielding: Unshielded
Operating temperature range: must encompass or exceed -55°C to 125°C

Direct Equivalents (Bourns CM45 Series): CM453232-220JL and CM453232-220KL meet all primary criteria with identical electrical specifications and package dimensions. Both are active products with improved RoHS3 compliance compared to the obsolete PM40-220K.

Similar Alternatives (Alternative Manufacturers): 1812-223J (API Delevan), 3613C220K (TE Connectivity), and 744766122 (Würth Elektronik) match the core electrical parameters (22 µH, 180 mA, 3.2Ohm max, 1812 package) but may have minor variations in operating temperature ranges or physical height that require design verification.

Non-Equivalent Part: CM453232-R18ML is excluded from substitution due to fundamentally different electrical specifications (180 nH inductance, 700 mA current rating, 240mOhm DCR), making it unsuitable for applications requiring 22 µH performance.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating (mA)	DCR Max (Ohm)	Tolerance	Operating Temp (°C)	Package	Product Status	RoHS Status
PM40-220K	Bourns Inc.	22 µH	180	3.2	±10%	-55 ~ 125	1812	Obsolete	Non-compliant
CM453232-220JL	Bourns Inc.	22 µH	180	3.2	±5%	-40 ~ 125	1812	Active	ROHS3 Compliant
CM453232-220KL	Bourns Inc.	22 µH	180	3.2	±10%	-40 ~ 125	1812	Active	ROHS3 Compliant
1812-223J	API Delevan Inc.	22 µH	250	3.2	±5%	-55 ~ 125	1812	Active	Non-compliant
3613C220K	TE Connectivity	22 µH	180	3.2	±10%	-30 ~ 100	1812	Active	ROHS3 Compliant
744766122	Würth Elektronik	22 µH	180	3.2	±10%	-40 ~ 105	1812	Active	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Substitutes: CM453232-220JL and CM453232-220KL are direct Bourns equivalents with active product status and ROHS3 compliance. CM453232-220KL offers the highest inventory availability (25,300 pcs) with Cut Tape and Digi-Reel packaging options. CM453232-220JL provides tighter tolerance (±5%) if inductance precision is critical.

Alternative Selections: 1812-223J (API Delevan) maintains the full -55°C to 125°C operating range of the original PM40-220K and provides higher current margin (250 mA vs. 180 mA). However, RoHS non-compliance may restrict use in regulated applications.

3613C220K (TE Connectivity) offers ROHS3 compliance and active status but operates only to 100°C maximum, making it unsuitable for applications requiring the full -55°C to 125°C range.

744766122 (Würth Elektronik) provides ROHS3 compliance and active status with -40°C to 105°C operating range, representing a middle-ground option between temperature capability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can CM453232-220JL and CM453232-220KL be used interchangeably? A: Yes. Both are Bourns CM45 series inductors with identical electrical specifications (22 µH, 180 mA, 3.2Ohm DCR). The primary difference is packaging format (Tape & Reel vs. Cut Tape) and tolerance (±5% vs. ±10%). Selection depends on procurement and assembly requirements.

Q: Why is 1812-223J listed as a similar alternative rather than a direct equivalent? A: While 1812-223J matches the 22 µH inductance, 180 mA current rating, and 3.2Ohm DCR, it is manufactured by API Delevan rather than Bourns and carries RoHS non-compliance status. It remains functionally suitable for applications not subject to RoHS restrictions.

Q: Is CM453232-R18ML a valid substitute? A: No. CM453232-R18ML has fundamentally different electrical specifications (180 nH inductance vs. 22 µH, 700 mA current rating vs. 180 mA, 240mOhm DCR vs. 3.2Ohm). It is not suitable for PM40-220K replacement.

Q: What is the impact of the -40°C lower operating temperature limit on Bourns CM45 substitutes? A: CM453232-220JL and CM453232-220KL operate from -40°C to 125°C, compared to the PM40-220K range of -55°C to 125°C. Applications requiring operation below -40°C must use 1812-223J or verify that the reduced lower temperature limit is acceptable for the specific design.

Q: Are all substitute parts available in 1812 (4532 Metric) package? A: Yes. All listed substitute parts use the 1812 (4532 Metric) surface mount package with compatible footprints. Physical height variations (3.20mm to 3.60mm seated height) are within standard PCB assembly tolerances.

Q: Which substitute offers the best regulatory compliance? A: CM453232-220JL, CM453232-220KL, 3613C220K, and 744766122 all carry ROHS3 compliance. 1812-223J and the original PM40-220K are RoHS non-compliant.

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