PM32-181M-RC Equivalent & Substitute Parts

Part Overview

The PM32-181M-RC is a 180 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., designed for surface mount applications. This component operates across a temperature range of -40°C to 125°C with a current rating of 185 mA and maximum DC resistance of 5 Ohm. The part is ROHS3 compliant and carries an active product status. Substitute parts are identified to provide design flexibility when the primary part number becomes unavailable or when inventory constraints require alternative sourcing.

Substiute Parts

PM32-181M-RC

Bourns Inc.In Stock: 972PM32-181M-RC Datasheet

Current PartRFQ

SDR0302-181KL

Bourns Inc.In Stock: 7932SDR0302-181KL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PM32-181M-RC is determined by strict equivalence across the following critical parameters:

• Inductance value: 180 µH
• Current rating: 185 mA minimum
• Saturation current (Isat): 210 mA minimum
• DC resistance: 5 Ohm maximum
• Core type: Ferrite, unshielded drum core
• Mounting: Surface mount
• Physical dimensions: 0.118" L x 0.110" W (3.00 mm x 2.80 mm)
• Operating temperature range: -40°C to 125°C
• Regulatory compliance: ROHS3 compliant

The SDR0302-181KL meets all critical electrical and mechanical parameters required for direct substitution. Tolerance differences do not preclude substitution when the application circuit design accommodates the specified tolerance range.

Parameter Comparison

Engineering Selection Recommendations

Both the PM32-181M-RC and SDR0302-181KL are active products from Bourns Inc. with identical ROHS3 compliance and MSL ratings. The SDR0302-181KL offers tighter inductance tolerance (±10% versus ±20%), which may provide improved circuit performance in applications requiring closer inductance specification. Both parts are suitable for applications operating within the specified temperature range and current limits. Selection between these parts should be based on tolerance requirements, inventory availability, and lead time considerations.

Frequently Asked Questions (FAQ)

Q: Can the SDR0302-181KL replace the PM32-181M-RC in existing designs?

A: Yes. Both parts share identical electrical specifications for inductance, current rating, saturation current, DC resistance, Q factor, and self-resonant frequency. Physical dimensions and mounting type are identical. The SDR0302-181KL features tighter tolerance, which is compatible with applications designed for the PM32-181M-RC.

Q: What is the significance of the tolerance difference between these parts?

A: The PM32-181M-RC carries ±20% tolerance while the SDR0302-181KL carries ±10% tolerance. Both tolerances are within the specified range for the 180 µH inductance value. Circuit designs must accommodate the applicable tolerance range of the selected part.

Q: Are the physical packages identical?

A: Yes. Both parts measure 0.118" L x 0.110" W (3.00 mm x 2.80 mm) with a maximum seated height of 0.110" (2.80 mm). Both are packaged in Tape & Reel format for surface mount assembly.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the PM32-181M-RC and SDR0302-181KL are ROHS3 compliant with MSL rating of 1 (Unlimited). Both are active products from Bourns Inc.

Q: What are the current handling limits for these inductors?

A: Both parts are rated for 185 mA continuous current with a saturation current (Isat) of 210 mA. Applications must not exceed these ratings.