PM42S-2R2-RC Equivalent & Substitute Parts

Part Overview

The PM42S-2R2-RC is a 2.2 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 2.1 A with a maximum DC resistance of 55 mOhm. This surface mount component is designed for applications requiring compact, high-performance inductive filtering and energy storage in power conversion circuits. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range.

Key Parameters

Parameter	Value
Inductance	2.2 µH
Current Rating	2.1 A
DC Resistance (Max)	55 mOhm
Tolerance	±30%
Core Material	Ferrite
Shielding	Shielded
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Q @ Frequency	8 @ 7.96 MHz
Self Resonant Frequency	90 MHz

Substitute Part Grouping Explanation

Substitution eligibility for the PM42S-2R2-RC is determined by strict equivalence across the following critical parameters:

Inductance value: 2.2 µH (±30% tolerance band)
Current rating: 2.1 A minimum
DC resistance: 55 mOhm maximum
Core type: Ferrite shielded drum core
Mounting: Surface mount configuration
Temperature range: -40°C to 125°C minimum
Frequency characteristics: Q factor and self-resonant frequency within specified range

The SRR4018-2R2Y meets all substitution criteria, maintaining identical electrical specifications while differing only in package case designation and physical height, which do not affect functional performance in equivalent circuit applications.

Parameter Comparison

Parameter	PM42S-2R2-RC	SRR4018-2R2Y	Match Status
Inductance	2.2 µH	2.2 µH	Identical
Tolerance	±30%	±30%	Identical
Current Rating (Amps)	2.1 A	2.1 A	Identical
Current - Saturation (Isat)	2.1 A	2.1 A	Identical
DC Resistance (Max)	55 mOhm	55 mOhm	Identical
Core Material	Ferrite	Ferrite	Identical
Shielding	Shielded	Shielded	Identical
Q @ Frequency	8 @ 7.96 MHz	8 @ 7.96 MHz	Identical
Frequency - Self Resonant	90 MHz	90 MHz	Identical
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Size / Dimension	0.189" L x 0.189" W (4.80mm x 4.80mm)	0.189" L x 0.189" W (4.80mm x 4.80mm)	Identical
Height - Seated (Max)	0.118" (3.00mm)	0.079" (2.00mm)	Different
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical

Engineering Selection Recommendations

Both PM42S-2R2-RC and SRR4018-2R2Y are active production components with full RoHS3 compliance and REACH unaffected status. Selection between these parts should be based on physical height constraints within the application. The PM42S-2R2-RC has a seated height of 3.00mm, while the SRR4018-2R2Y has a seated height of 2.00mm. For applications with vertical space limitations, the SRR4018-2R2Y provides a 1.00mm height advantage without compromising electrical performance. Both components maintain identical electrical specifications, core material composition, shielding characteristics, and temperature operating range. Packaging format differences (Nonstandard versus 1919/4848 Metric) do not affect functional equivalence in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can SRR4018-2R2Y be used as a direct replacement for PM42S-2R2-RC?

A: Yes. Both inductors provide identical electrical performance with 2.2 µH inductance, 2.1 A current rating, and 55 mOhm maximum DC resistance. The primary difference is physical height: SRR4018-2R2Y is 1.00mm shorter (2.00mm vs. 3.00mm seated height). Verify PCB layout clearance before substitution.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts carry identical RoHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity rating (MSL 1). Regulatory and environmental certifications are equivalent.

Q: What determines substitution eligibility for this inductor category?

A: Substitution requires matching inductance value (2.2 µH ±30%), current rating (2.1 A minimum), DC resistance (55 mOhm maximum), core material (ferrite shielded), operating temperature range (-40°C to 125°C), and surface mount configuration. Frequency characteristics (Q factor and self-resonant frequency) must also remain within specification.

Q: Does the height difference affect electrical performance?

A: No. Physical height does not alter inductance, current handling, resistance, or frequency response. Height differences are relevant only for PCB layout and mechanical clearance considerations.

Q: Are both parts available in equivalent quantities?

A: Inventory levels may vary. PM42S-2R2-RC has 1086 pieces in stock, while SRR4018-2R2Y has 2003 pieces available. Verify current stock status with your supplier for production requirements.

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