Murata Power Solutions 18333C Fixed Inductor Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 18333C is a 33 µH unshielded wirewound inductor rated for 2 A continuous current with a maximum DC resistance of 40 mOhm. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity. The 1800 series inductor is designed for through-hole axial mounting applications requiring stable inductance values across standard operating temperature ranges.

Substiute Parts

18333C

Murata Power Solutions Inc.In Stock: 109618333C Datasheet

Current PartRFQ

5900-330-RC

Bourns Inc.In Stock: 17635900-330-RC Datasheet

MFR RecommendedRFQ

AIAP-02-330K

Abracon LLCIn Stock: 6311AIAP-02-330K Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 18333C are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

• Inductance value: 33 µH (±10% tolerance maintained)
• Mounting configuration: Through-hole axial package
• Shielding classification: Unshielded
• Inductance measurement frequency: 1 kHz

Secondary Compatibility Parameters:

• Current rating: Equal to or greater than 2 A
• DC resistance: Equal to or less than 40 mOhm (lower DCR preferred for reduced losses)
• Operating temperature range: Must encompass or exceed 0°C ~ 70°C

The substitute parts listed below meet these core electrical specifications while maintaining mechanical compatibility with the original 18333C footprint requirements.

Parameter Comparison

Engineering Selection Recommendations

Bourns 5900-330-RC: This substitute offers superior electrical performance with lower DC resistance (37 mOhm vs. 40 mOhm) and higher current capacity (3.4 A vs. 2 A). The extended operating temperature range (-55°C ~ 105°C) provides broader environmental compatibility. The part is actively manufactured and RoHS3 compliant. Physical dimensions differ slightly (0.453" Dia x 0.900" L vs. 0.539" Dia x 0.719" L), requiring verification of board layout constraints.

Abracon AIAP-02-330K: This substitute maintains wirewound construction identical to the original 18333C and provides adequate current capacity (2.2 A). However, the DC resistance specification (76 mOhm Max) exceeds the original part's 40 mOhm maximum, resulting in increased power dissipation. The compact physical dimensions (0.252" Dia x 0.551" L) offer space advantages in constrained layouts. The part is actively manufactured and RoHS3 compliant.

Selection between substitutes depends on thermal performance requirements and available board space. Applications prioritizing low DC resistance and thermal margin should specify the Bourns 5900-330-RC. Applications with space constraints and acceptable power loss tolerance may utilize the Abracon AIAP-02-330K.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 5900-330-RC be used as a direct replacement for the Murata 18333C?

A: The Bourns 5900-330-RC meets all primary electrical specifications (33 µH inductance, ±10% tolerance, unshielded axial configuration) and exceeds current and temperature ratings. Physical dimensions differ, requiring PCB layout verification before implementation.

Q: What is the impact of higher DC resistance in the Abracon AIAP-02-330K?

A: The Abracon part specifies 76 mOhm maximum DCR compared to the original 40 mOhm maximum. At 2 A continuous current, this results in approximately 0.32 W additional power dissipation (I²R loss difference). Thermal analysis is required for applications with strict power budget constraints.

Q: Are both substitute parts RoHS compliant?

A: Yes. The Bourns 5900-330-RC is RoHS3 compliant. The Abracon AIAP-02-330K is RoHS3 compliant. Both parts are REACH unaffected.

Q: Do the substitute parts fit the same PCB footprint as the 18333C?

A: All three parts use through-hole axial mounting. However, physical dimensions vary: the Murata 18333C measures 0.539" Dia x 0.719" L, the Bourns 5900-330-RC measures 0.453" Dia x 0.900" L, and the Abracon AIAP-02-330K measures 0.252" Dia x 0.551" L. Board layout verification is necessary for each substitute.

Q: Which substitute offers the best thermal performance?

A: The Bourns 5900-330-RC provides superior thermal performance with 37 mOhm DCR (lower than the original 40 mOhm specification) and higher current capacity (3.4 A), reducing thermal stress at rated current levels.

Q: Can these parts be used interchangeably in the same design?

A: Electrical interchangeability is confirmed for the specified 33 µH inductance and ±10% tolerance. Mechanical interchangeability requires individual PCB layout assessment due to dimensional variations. Thermal performance differs based on DCR specifications.