PM32-1R8M-RC Equivalent & Substitute Parts

Part Overview

The PM32-1R8M-RC is a 1.8 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.8 A continuous current with a maximum DC resistance of 80 mOhm. This surface mount component is designed for applications requiring fixed inductance in compact form factors. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when electrical characteristics, mechanical dimensions, and compliance certifications remain equivalent across the specified operating range.

Key Parameters

Parameter	Value
Inductance	1.8 µH
Inductance Tolerance	±20%
Current Rating	1.8 A
Saturation Current (Isat)	2 A
DC Resistance (DCR)	80 mOhm Max
Core Material	Ferrite
Shielding	Unshielded
Q Factor @ 7.96 MHz	23
Self Resonant Frequency	85 MHz
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package Dimensions	3.00 mm L × 2.80 mm W × 2.80 mm H
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the PM32-1R8M-RC is determined by strict equivalence across the following critical parameters:

Inductance value: 1.8 µH with ±20% tolerance
Current rating: 1.8 A minimum continuous current capability
DC resistance: 80 mOhm maximum
Core type: Ferrite drum core, unshielded construction
Saturation current: 2 A minimum
Operating temperature range: -40°C to 125°C minimum
Package dimensions: 3.00 mm × 2.80 mm × 2.80 mm (surface mount)
Compliance: ROHS3 and REACH requirements

The SDR0302-1R8ML meets all specified electrical and mechanical parameters, maintaining identical inductance, current ratings, DC resistance, core material, and thermal operating range. Both parts are manufactured by Bourns Inc. and share equivalent compliance certifications.

Parameter Comparison

Parameter	PM32-1R8M-RC	SDR0302-1R8ML	Match Status
Inductance	1.8 µH	1.8 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating	1.8 A	1.8 A	Equivalent
Saturation Current	2 A	2 A	Equivalent
DC Resistance (Max)	80 mOhm	80 mOhm	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Q Factor @ 7.96 MHz	23	23	Equivalent
Self Resonant Frequency	85 MHz	85 MHz	Equivalent
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package Dimensions	3.00 mm × 2.80 mm × 2.80 mm	3.00 mm × 2.80 mm × 2.80 mm	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity	MSL 1	MSL 1	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

Both PM32-1R8M-RC and SDR0302-1R8ML are active production components from Bourns Inc. with identical electrical specifications and mechanical compatibility. Selection between these parts may be based on inventory availability and supply chain considerations. The PM32-1R8M-RC currently maintains 798 pieces in stock, while the SDR0302-1R8ML has 4930 pieces available. Both parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for industrial and commercial applications. The identical operating temperature range, saturation characteristics, and DC resistance specifications ensure functional interchangeability in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can SDR0302-1R8ML be used as a direct replacement for PM32-1R8M-RC?

A: Yes. Both parts share identical inductance values, current ratings, DC resistance specifications, core materials, and package dimensions. Electrical performance and thermal operating ranges are equivalent.

Q: Are there any differences in the package or mounting footprint?

A: No. Both components use identical surface mount package dimensions of 3.00 mm length × 2.80 mm width × 2.80 mm height, ensuring PCB footprint compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both PM32-1R8M-RC and SDR0302-1R8ML are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements.

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

A: The ±20% tolerance defines the acceptable range of inductance variation from the nominal 1.8 µH value. Both substitute parts maintain this identical tolerance specification, ensuring equivalent circuit performance within design margins.

Q: Are the DC resistance specifications identical?

A: Yes. Both parts specify a maximum DC resistance of 80 mOhm, providing equivalent power dissipation characteristics and thermal performance in circuit applications.

Q: What is the saturation current rating and why is it important?

A: Both parts have a saturation current (Isat) of 2 A, representing the current level at which the inductor begins to lose inductance due to core saturation. This specification ensures equivalent current handling capability beyond the 1.8 A continuous rating.

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