PM105-331K Equivalent & Substitute Parts

Part Overview

The PM105-331K is a 330 µH unshielded drum core, wirewound inductor manufactured by Bourns Inc., rated for 520 mA with 1.15Ohm DC resistance. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The part operates across -30°C to 100°C with ±10% inductance tolerance and is mounted as a surface mount nonstandard package component.

Substiute Parts

PM105-331K

Bourns Inc.In Stock: 792PM105-331K Datasheet

Current PartRFQ

PM105-331K-RC

Bourns Inc.In Stock: 3555PM105-331K-RC Datasheet

DirectRFQ

SDR1006-331KL

Bourns Inc.In Stock: 1471SDR1006-331KL Datasheet

DirectRFQ

CD105NP-331KC

Sumida America Components Inc.In Stock: 827CD105NP-331KC Datasheet

SimilarRFQ

SLF10145T-331MR54-PF

TDK CorporationIn Stock: 15653SLF10145T-331MR54-PF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PM105-331K is determined by the following critical parameters:

• Inductance Value: 330 µH (±10% tolerance acceptable)
• Current Rating: Minimum 520 mA
• DC Resistance: 1.15Ohm or lower
• Core Material: Ferrite
• Mounting Type: Surface Mount
• Physical Dimensions: Compatible footprint (9.80mm x 9.80mm base dimension)
• Operating Temperature: Minimum -30°C to 100°C range

Substitute parts are classified into two categories:

Direct Equivalents maintain identical electrical specifications and physical dimensions, differing only in packaging format or product status upgrade.

Similar Alternatives meet the core electrical requirements but may have minor variations in secondary parameters such as saturation current, Q factor, or self-resonant frequency, provided these variations do not compromise circuit functionality.

Parameter Comparison

Engineering Selection Recommendations

PM105-331K-RC is the primary direct equivalent. This part maintains identical electrical specifications and physical dimensions while offering active product status and ROHS3 compliance. The upgrade from bulk to Tape & Reel packaging improves handling and assembly efficiency. This substitution is recommended for all new procurement.

SDR1006-331KL provides direct electrical equivalence with enhanced operating temperature range (-40°C to 125°C) and active product status. The SDR1006 series represents a current-generation alternative within the Bourns product portfolio. This part is suitable for applications requiring extended temperature performance.

CD105NP-331KC from Sumida America Components Inc. meets all core electrical requirements with active product status and ROHS3 compliance. Physical dimensions show minor variation (10.00mm x 9.00mm versus 9.80mm x 9.80mm), requiring footprint verification before implementation. This option provides supply diversification from an alternative manufacturer.

SLF10145T-331MR54-PF from TDK Corporation is classified as "Not For New Designs" and carries a wider inductance tolerance (±20% versus ±10%). The shielded construction differs from the original unshielded design. This part should be used only for legacy system maintenance where electromagnetic shielding is beneficial or required.

Frequently Asked Questions (FAQ)

Q: Can PM105-331K-RC be used as a direct replacement for PM105-331K?

A: Yes. PM105-331K-RC maintains identical inductance (330 µH), current rating (520 mA), DC resistance (1.15Ohm), core material (ferrite), and physical dimensions. The primary differences are packaging format (Tape & Reel versus bulk) and product status upgrade (Active versus Obsolete). No circuit redesign is required.

Q: What is the key difference between the Bourns PM105 and SDR1006 series?

A: Both series share identical electrical specifications for the 330 µH rating. The SDR1006 series offers an extended operating temperature range (-40°C to 125°C versus -30°C to 100°C) and represents a more current product line. Selection depends on application temperature requirements.

Q: Why does the CD105NP-331KC have different physical dimensions?

A: The CD105NP-331KC from Sumida measures 10.00mm x 9.00mm compared to the 9.80mm x 9.80mm footprint of the PM105-331K. While height remains identical at 5.80mm, the length and width variation requires PCB layout verification to confirm compatibility with existing component placement.

Q: Is the SLF10145T-331MR54-PF suitable for new designs?

A: No. This part carries "Not For New Designs" status. Additionally, it features shielded construction (versus unshielded), wider inductance tolerance (±20% versus ±10%), and lower DC resistance (816mOhm versus 1.15Ohm). Use only for legacy system support where these characteristics are specifically required.

Q: What compliance advantages do the substitute parts offer?

A: PM105-331K-RC, SDR1006-331KL, and CD105NP-331KC are all ROHS3 compliant, whereas the original PM105-331K is RoHS non-compliant. This compliance upgrade is significant for applications subject to environmental regulations or customer requirements. SLF10145T-331MR54-PF is also ROHS3 compliant but carries design discontinuation status.

Q: How do I select between multiple substitute options?

A: Prioritize based on: (1) Product status (Active preferred over Not For New Designs), (2) RoHS compliance requirements, (3) Operating temperature range needed, (4) Physical footprint compatibility, (5) Supply availability and lead time. PM105-331K-RC is the recommended first choice for direct replacement.