PM105-181K Equivalent & Substitute Parts

Part Overview

The PM105-181K is a 180 µH unshielded drum core, wirewound inductor manufactured by Bourns Inc., rated for 720 mA with 630mOhm DC resistance. This surface mount component operates across -30°C to 100°C and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for ongoing design support and procurement continuity.

Substiute Parts

PM105-181K

Bourns Inc.In Stock: 884PM105-181K Datasheet

Current PartRFQ

CM322522-1R8JL

Bourns Inc.In Stock: 1131CM322522-1R8JL Datasheet

DirectRFQ

PM105-181K-RC

Bourns Inc.In Stock: 962PM105-181K-RC Datasheet

DirectRFQ

PM105-221K-RC

Bourns Inc.In Stock: 3083PM105-221K-RC Datasheet

DirectRFQ

SDR1006-181KL

Bourns Inc.In Stock: 4889SDR1006-181KL Datasheet

DirectRFQ

CD105BNP-181KC

Sumida America Components Inc.In Stock: 918CD105BNP-181KC Datasheet

SimilarRFQ

CD105NP-181KC

Sumida America Components Inc.In Stock: 763CD105NP-181KC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical compatibility with the PM105-181K:

Direct Substitutes (Identical Electrical Specifications): Parts meeting all critical parameters: 180 µH inductance, 720 mA current rating, 630mOhm DCR, ±10% tolerance, ferrite core, unshielded configuration, and identical physical dimensions (9.80mm x 9.80mm x 5.80mm). These parts are interchangeable in applications where the PM105-181K was originally specified.

Similar Substitutes (Equivalent Electrical Performance, Minor Dimensional Variation): Parts with matching inductance, current rating, and DCR specifications but with slight dimensional differences (10.00mm x 9.00mm footprint). These require PCB layout verification before implementation.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: PM105-181K-RC

The PM105-181K-RC is the direct active equivalent from Bourns Inc. It maintains identical electrical specifications (180 µH, 720 mA, 630mOhm) and physical dimensions as the obsolete PM105-181K. This part carries ROHS3 compliance and is available in tape and reel packaging. The extended operating temperature range (-40°C to 125°C) provides broader environmental coverage than the original part.

Secondary Recommendation: SDR1006-181KL

The SDR1006-181KL offers identical electrical and mechanical specifications with ROHS3 compliance. As an active Bourns product with higher inventory availability (4799 pcs), it provides supply chain stability. The specified saturation current (1.3A) and Q factor (12 @ 796kHz) are documented, supporting design verification.

Alternative Recommendation: CD105NP-181KC

The CD105NP-181KC from Sumida America Components Inc. matches all critical electrical parameters with ROHS3 compliance. The footprint variation (10.00mm x 9.00mm versus 9.80mm x 9.80mm) requires PCB layout assessment. This option is suitable when Bourns parts are unavailable and footprint accommodation is feasible.

Not Recommended: CM322522-1R8JL

This part exhibits fundamentally different electrical specifications (1.8 µH inductance, 200 mA current rating) and is not functionally equivalent to the PM105-181K despite being listed in the original substitute field.

Frequently Asked Questions (FAQ)

Q: Can PM105-181K-RC be used as a direct replacement for PM105-181K?

A: Yes. The PM105-181K-RC is electrically and mechanically identical, with matching inductance (180 µH), current rating (720 mA), DCR (630mOhm), and physical dimensions (9.80mm x 9.80mm x 5.80mm). The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant).

Q: What is the difference between PM105-181K-RC and SDR1006-181KL?

A: Both parts are electrically equivalent with identical inductance, current rating, and DCR specifications. The difference lies in the series designation (PM105 versus SDR1006) and manufacturer documentation. SDR1006-181KL has higher documented inventory availability. Both are ROHS3 compliant and suitable for direct substitution.

Q: Can Sumida CD105 series parts replace Bourns PM105 parts?

A: CD105NP-181KC and CD105BNP-181KC match the electrical specifications of PM105-181K. However, the footprint differs slightly (10.00mm x 9.00mm versus 9.80mm x 9.80mm). PCB layout verification is required before implementation. CD105NP-181KC carries ROHS3 compliance.

Q: What does "Nonstandard" package mean?

A: "Nonstandard" indicates the component uses a proprietary or non-IPC standardized package format. All listed parts in this comparison use the same nonstandard package classification, ensuring mechanical compatibility when footprints are identical.

Q: Are there temperature range considerations when substituting?

A: The original PM105-181K operates -30°C to 100°C. Substitute parts PM105-181K-RC and SDR1006-181KL extend this to -40°C to 125°C, providing enhanced environmental coverage. CD105 series parts operate -40°C to 105°C. Verify application temperature requirements before selection.

Q: What is the significance of DCR (DC Resistance) specifications?

A: DCR directly affects power dissipation and thermal performance. The PM105-181K specifies 630mOhm DCR. Substitute parts specify either 630mOhm or 630mOhm Max. The "Max" designation indicates a tolerance band; actual values may be lower. This parameter is critical for current-carrying applications and thermal budget calculations.

Q: Is RoHS compliance mandatory for substitution?

A: RoHS compliance depends on application and regional requirements. The original PM105-181K is RoHS non-compliant. All active substitute parts (PM105-181K-RC, SDR1006-181KL, CD105NP-181KC) are ROHS3 compliant, supporting modern procurement and environmental standards.