Murata 18103C 10µH Wirewound Inductor Equivalent & Substitute Parts

Part Overview

The Murata 18103C is a 10µH unshielded wirewound inductor rated for 3.45A continuous current with a maximum DC resistance of 15mOhm. This through-hole axial component operates across a 0°C to 70°C temperature range and is part of the 1800 series. The product is currently obsolete, making equivalent substitutes necessary for new designs or component replenishment in legacy applications.

Substiute Parts

18103C

Murata Power Solutions Inc.In Stock: 106018103C Datasheet

Current PartRFQ

5900-100-RC

Bourns Inc.In Stock: 194595900-100-RC Datasheet

MFR RecommendedRFQ

LPA1020-100KL

Bourns Inc.In Stock: 921LPA1020-100KL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 18103C is determined by the following critical parameters:

• Inductance Value: Must be 10µH ±10% tolerance
• Mounting Configuration: Through-hole axial package required
• Current Handling: Minimum 3.45A continuous current rating
• DC Resistance: Lower or equivalent DCR preferred for thermal performance
• Shielding: Unshielded construction maintained
• Core Type: Wirewound construction with ferrite or equivalent core material

Two active alternatives meet these substitution criteria: the Bourns 5900-100-RC and the Bourns LPA1020-100KL. Both maintain the 10µH inductance specification, through-hole axial configuration, and unshielded wirewound design. The 5900-100-RC offers superior current handling at 4.7A with lower DCR (19mOhm), while the LPA1020-100KL provides a closer current match at 4.6A but with higher DCR (50mOhm).

Parameter Comparison

Engineering Selection Recommendations

Bourns 5900-100-RC is the primary substitute for applications requiring maximum performance margin. This part exceeds the original current specification (4.7A vs. 3.45A) and maintains comparable DCR performance (19mOhm vs. 15mOhm). The extended operating temperature range (-55°C to 105°C) provides broader environmental compatibility. RoHS3 compliance and active product status ensure long-term availability and supply chain stability.

Bourns LPA1020-100KL serves as an alternative for space-constrained applications, offering the smallest physical footprint (10.00mm diameter vs. 13.70mm). Current rating (4.6A) closely matches the original specification. However, the elevated DCR (50mOhm) results in increased power dissipation and should be evaluated against thermal design requirements. RoHS3 compliance and active status support ongoing procurement.

Both substitutes are REACH unaffected and classified as EAR99 for export control purposes, matching the regulatory profile of the original component.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 5900-100-RC directly replace the Murata 18103C in existing designs?

A: Yes. Both components share identical inductance (10µH ±10%), unshielded wirewound construction, through-hole axial mounting, and equivalent tolerance specifications. The 5900-100-RC provides superior current handling and comparable DCR performance. Physical dimensions differ slightly (0.453" diameter vs. 0.539"), requiring PCB layout verification for board-level compatibility.

Q: What is the impact of higher DCR in the LPA1020-100KL?

A: The LPA1020-100KL exhibits 50mOhm maximum DCR compared to the original 15mOhm specification. In applications with sustained current flow, this results in increased resistive losses and heat generation. Power dissipation scales with I²R; at 3.45A, the difference is approximately 0.178W additional loss. Thermal design and circuit performance must be re-evaluated for this substitute.

Q: Are both substitutes suitable for high-frequency applications?

A: The original 18103C specifies Q @ 500kHz (64) and self-resonant frequency of 19MHz. Substitute parts do not provide equivalent frequency response data. Selection should be based on the specific frequency requirements of the application rather than high-frequency performance assumptions.

Q: What are the packaging differences?

A: The 5900-100-RC is supplied in trays; the LPA1020-100KL is supplied in bulk. The original 18103C packaging is not specified. Procurement and handling procedures may differ accordingly.

Q: Do both substitutes meet compliance requirements?

A: Yes. Both Bourns alternatives are RoHS3 compliant, REACH unaffected, and classified as EAR99, matching the regulatory status of the original Murata component.