PM40-2R2K Equivalent & Substitute Parts

Part Overview

The PM40-2R2K is a 2.2 µH unshielded molded inductor manufactured by Bourns Inc., rated for 380 mA with a maximum DC resistance of 700mOhm in a 1812 (4532 Metric) surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	2.2 µH
Current Rating	380 mA
DC Resistance (Max)	700mOhm
Package / Case	1812 (4532 Metric)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C ~ 125°C
Shielding	Unshielded
Q @ Frequency	50 @ 7.96MHz
Self Resonant Frequency	55MHz

Substitute Part Grouping Explanation

Substitution eligibility for the PM40-2R2K is determined by the following critical parameters:

Inductance Value: 2.2 µH (primary electrical specification)
Current Rating: Minimum 380 mA (electrical performance requirement)
DC Resistance: Maximum 700mOhm (thermal and efficiency constraint)
Package / Case: 1812 (4532 Metric) (mechanical and PCB layout requirement)
Mounting Type: Surface Mount (assembly compatibility)

Parts meeting all five criteria are classified as direct equivalents. Parts with identical inductance, current rating, and DC resistance but different core materials or tolerances remain functionally equivalent within the specified electrical parameters.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating (mA)	DCR Max (mOhm)	Core Type	Tolerance	Operating Temp (°C)	Product Status	RoHS Status
PM40-2R2K	Bourns Inc.	2.2 µH	380	700	Iron Powder	±10%	-55 ~ 125	Obsolete	Non-compliant
CM453232-2R2JL	Bourns Inc.	2.2 µH	380	700	Ferrite	±5%	-40 ~ 125	Active	ROHS3 Compliant
CM453232-2R2KL	Bourns Inc.	2.2 µH	380	700	Ferrite	±10%	-40 ~ 125	Active	ROHS3 Compliant
PM1812-2R2J-RC	Bourns Inc.	2.2 µH	380	700	Ferrite	±5%	-40 ~ 100	Active	ROHS3 Compliant
1812-222J	API Delevan Inc.	2.2 µH	535	700	Ferrite	±5%	-55 ~ 125	Active	Non-compliant
3613C2R2K	TE Connectivity Passive Product	2.2 µH	380	700	Ferrite	±10%	-30 ~ 100	Active	ROHS3 Compliant
74476602	Würth Elektronik	2.2 µH	380	700	Ferrite	±10%	-40 ~ 105	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Bourns CM45 Series)

CM453232-2R2JL and CM453232-2R2KL are active production parts from Bourns Inc. with identical electrical specifications to the PM40-2R2K. Both meet the 2.2 µH inductance, 380 mA current rating, and 700mOhm DC resistance requirements. CM453232-2R2JL offers tighter tolerance (±5%) compared to the original part (±10%). Both are ROHS3 compliant and available in high inventory quantities.

Alternative Equivalents (Cross-Manufacturer)

PM1812-2R2J-RC (Bourns), 1812-222J (API Delevan), 3613C2R2K (TE Connectivity), and 74476602 (Würth Elektronik) meet the core electrical parameters. The 1812-222J provides higher current rating (535 mA) while maintaining the same inductance and DC resistance. All active production alternatives are available in adequate inventory.

Compliance Considerations

CM453232-2R2JL, CM453232-2R2KL, PM1812-2R2J-RC, 3613C2R2K, and 74476602 are ROHS3 compliant. The original PM40-2R2K and 1812-222J are RoHS non-compliant. For applications requiring RoHS compliance, select from the compliant alternatives.

Temperature Range Limitations

The original PM40-2R2K operates from -55°C to 125°C. PM1812-2R2J-RC and 3613C2R2K have reduced upper temperature limits (-40°C to 100°C and -30°C to 100°C respectively). For applications requiring the full -55°C to 125°C range, use CM453232-2R2JL, CM453232-2R2KL, 1812-222J, or 74476602.

Frequently Asked Questions (FAQ)

Q: Can CM453232-2R2JL directly replace PM40-2R2K?

A: Yes. Both parts share identical inductance (2.2 µH), current rating (380 mA), and DC resistance (700mOhm) in the same 1812 package. CM453232-2R2JL uses ferrite core instead of iron powder and offers tighter tolerance (±5% vs ±10%). It is ROHS3 compliant and in active production.

Q: What is the difference between CM453232-2R2JL and CM453232-2R2KL?

A: Both are Bourns CM45 series parts with identical electrical performance. The primary difference is tolerance: CM453232-2R2JL is ±5% while CM453232-2R2KL is ±10%. Both meet the PM40-2R2K specifications and are ROHS3 compliant.

Q: Why is 1812-222J listed as a substitute if it has higher current rating?

A: The 1812-222J (API Delevan) meets all critical substitution criteria: 2.2 µH inductance, 700mOhm DC resistance, and 1812 package. The higher current rating (535 mA vs 380 mA) is a performance advantage, not a limitation. It operates across the full -55°C to 125°C temperature range matching the original part.

Q: Are there package compatibility concerns with these substitutes?

A: All listed substitutes use the 1812 (4532 Metric) surface mount package with identical footprint dimensions (0.177" L x 0.126" W / 4.50mm x 3.20mm). Height variations exist (0.126" to 0.142" seated height), but these fall within standard PCB assembly tolerances for surface mount components.

Q: Which substitute offers the best compliance profile?

A: CM453232-2R2JL, CM453232-2R2KL, 3613C2R2K, and 74476602 are all ROHS3 compliant. CM453232-2R2JL additionally offers the tightest tolerance (±5%) and is from the original manufacturer (Bourns), providing design continuity.

Q: Can I use these substitutes in high-temperature applications?

A: For applications requiring operation above 100°C, use CM453232-2R2JL, CM453232-2R2KL, 1812-222J, or 74476602, all rated to 105°C or higher. PM1812-2R2J-RC and 3613C2R2K are limited to 100°C maximum.

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