Murata Power Solutions 18685C Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 18685C is a 6.8 mH unshielded wirewound inductor rated for 150 mA with a maximum DC resistance of 7 ohms, designed for through-hole axial mounting. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain the core inductance value of 6.8 mH and operate within compatible current and resistance parameters to ensure functional equivalence in circuit applications.

Substiute Parts

18685C

Murata Power Solutions Inc.In Stock: 110718685C Datasheet

Current PartRFQ

5900-682-RC

Bourns Inc.In Stock: 9705900-682-RC Datasheet

MFR RecommendedRFQ

AIAP-02-682K

Abracon LLCIn Stock: 1851AIAP-02-682K Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 18685C is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 6.8 mH (±10% tolerance maintained)
• Mounting type: Through hole axial configuration
• Shielding classification: Unshielded
• Inductance test frequency: 1 kHz

Secondary Compatibility Parameters:

• Current rating must equal or exceed 150 mA
• DC resistance must not exceed 7 ohms maximum
• Operating temperature range must encompass or extend the original 0°C ~ 70°C specification
• RoHS and REACH compliance status must be maintained

The two substitute parts listed below meet these criteria with variations in current handling capability, DC resistance, and core material composition.

Parameter Comparison

Engineering Selection Recommendations

Bourns 5900-682-RC: This part is the manufacturer-recommended substitute. It maintains the 6.8 mH inductance specification with improved current handling at 280 mA and reduced DC resistance of 5.4 ohms maximum. The extended operating temperature range of -55°C to 105°C provides broader environmental compatibility. ROHS3 compliance ensures regulatory alignment with current standards. The ferrite drum core construction offers enhanced performance characteristics compared to the original wirewound design.

Abracon AIAP-02-682K: This part provides direct electrical equivalence to the 18685C with matched current rating of 150 mA and identical inductance tolerance. However, the DC resistance of 16.3 ohms maximum exceeds the original specification by more than double, which may impact circuit performance in applications sensitive to inductor losses. ROHS3 compliance and active product status ensure long-term availability. This substitute is suitable for applications where current rating and inductance are primary concerns and higher DC resistance is acceptable.

Both substitute parts are active products with current manufacturing support and regulatory compliance, addressing the obsolescence status of the original component.

Frequently Asked Questions (FAQ)

Q: Can the Bourns 5900-682-RC be used as a direct replacement for the 18685C?

A: Yes. The 5900-682-RC maintains the critical 6.8 mH inductance value and unshielded axial configuration. The higher current rating of 280 mA and lower DC resistance of 5.4 ohms provide improved performance margins. The extended operating temperature range supports broader application requirements.

Q: What is the impact of higher DC resistance in the Abracon AIAP-02-682K?

A: The AIAP-02-682K has a maximum DC resistance of 16.3 ohms compared to the 18685C specification of 7 ohms maximum. This increased resistance will result in higher power dissipation in the inductor. Applications with strict power budget or thermal constraints should evaluate this parameter against circuit requirements.

Q: Are both substitute parts physically compatible with the original PCB layout?

A: All three parts use through-hole axial mounting. Physical compatibility depends on specific board hole spacing and component clearance. The Bourns 5900-682-RC has dimensions of 0.453" diameter by 0.900" length, while the Abracon AIAP-02-682K is smaller at 0.252" diameter by 0.551" length. Verify mechanical fit against the original 18685C dimensions of 0.539" diameter by 0.719" length.

Q: Do the substitute parts maintain RoHS compliance?

A: Yes. Both the Bourns 5900-682-RC and Abracon AIAP-02-682K are ROHS3 compliant, meeting current regulatory requirements. The original 18685C is RoHS compliant, ensuring continuity of compliance status across all three parts.

Q: Which substitute part is recommended for new designs?

A: The Bourns 5900-682-RC is the manufacturer-recommended substitute with active product status, improved electrical performance, and extended operating temperature range. For applications requiring exact current rating matching, the Abracon AIAP-02-682K provides equivalent 150 mA rating with the trade-off of higher DC resistance.