PM32-3R3M-RC Equivalent & Substitute Parts

Part Overview

The PM32-3R3M-RC is a 3.3 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.4 A continuous current with a maximum DC resistance of 110 mOhm. This surface mount component operates across the temperature range of -40°C to 125°C and is classified as Active product status. Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and compliance certifications align with the original component, enabling direct replacement in circuit designs without performance degradation.

Key Parameters

Parameter	Value
Inductance	3.3 µH
Tolerance	±20%
Current Rating	1.4 A
Current - Saturation (Isat)	1.6 A
DC Resistance (DCR)	110 mOhm Max
Core Material	Ferrite
Shielding	Unshielded
Q @ Frequency	23 @ 7.96 MHz
Self Resonant Frequency	68 MHz
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package Dimensions	0.118" L x 0.110" W (3.00 mm x 2.80 mm)
Height - Seated (Max)	0.110" (2.80 mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the PM32-3R3M-RC is determined by strict equivalence across the following critical parameters:

Inductance value of 3.3 µH with ±20% tolerance ensures functional compatibility in circuit applications. Current rating of 1.4 A and saturation current of 1.6 A must be maintained to prevent thermal stress and core saturation. DC resistance of 110 mOhm maximum preserves power dissipation characteristics. Ferrite core material with unshielded construction maintains electromagnetic behavior. Surface mount packaging and nonstandard case dimensions (3.00 mm x 2.80 mm) ensure mechanical fit on printed circuit boards. Operating temperature range of -40°C to 125°C and RoHS3 compliance are mandatory for regulatory and environmental requirements.

The SDR0302-3R3ML meets all substitution criteria through identical electrical specifications, core material, shielding configuration, and mechanical dimensions, while maintaining equivalent compliance certifications.

Parameter Comparison

Parameter	PM32-3R3M-RC	SDR0302-3R3ML	Match Status
Inductance	3.3 µH	3.3 µH	Equivalent
Tolerance	±20%	±20%	Equivalent
Current Rating (Amps)	1.4 A	1.4 A	Equivalent
Current - Saturation (Isat)	1.6 A	1.6 A	Equivalent
DC Resistance (DCR)	110 mOhm Max	110 mOhm Max	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Q @ Frequency	23 @ 7.96 MHz	23 @ 7.96 MHz	Equivalent
Self Resonant Frequency	68 MHz	68 MHz	Equivalent
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package Dimensions	3.00 mm x 2.80 mm	3.00 mm x 2.80 mm	Equivalent
Height - Seated (Max)	2.80 mm	2.80 mm	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

Both PM32-3R3M-RC and SDR0302-3R3ML are classified as Active products manufactured by Bourns Inc. and maintain full compliance with ROHS3 and REACH regulations. Selection between these components may be based on inventory availability and supply chain considerations. The PM32-3R3M-RC currently maintains 979 pieces in stock, while the SDR0302-3R3ML offers higher availability with 5562 pieces in stock. Both components are suitable for direct substitution in applications requiring 3.3 µH inductance at 1.4 A continuous current within the specified temperature operating range.

Frequently Asked Questions (FAQ)

Q: Can SDR0302-3R3ML replace PM32-3R3M-RC in existing designs?

A: Yes. The SDR0302-3R3ML is a direct substitute. All electrical parameters, including inductance, current rating, DC resistance, and frequency characteristics are identical. Mechanical dimensions and mounting type are equivalent, enabling direct PCB placement without design modification.

Q: Are there differences in core material or shielding between these parts?

A: No. Both components utilize ferrite core material with unshielded construction. Electromagnetic behavior and frequency response characteristics are identical.

Q: What is the significance of the ±20% inductance tolerance?

A: The ±20% tolerance defines the acceptable range of inductance variation from the nominal 3.3 µH value. Both substitute parts maintain this tolerance specification, ensuring circuit performance remains within design parameters.

Q: Do these components have different compliance certifications?

A: No. Both PM32-3R3M-RC and SDR0302-3R3ML are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements for electronic component use.

Q: What is the Moisture Sensitivity Level (MSL) rating, and why is it relevant?

A: Both components carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions during storage or handling. Standard storage conditions are acceptable without desiccant requirements.

Q: Are the package dimensions identical for both parts?

A: Yes. Both components measure 3.00 mm length by 2.80 mm width with a maximum seated height of 2.80 mm, ensuring identical footprint compatibility on surface mount PCBs.

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