74F185AP-RC Equivalent & Substitute Parts

Part Overview

The 74F185AP-RC is an 18 µH unshielded wirewound inductor manufactured by Bourns Inc., rated for 100 mA maximum current with a DC resistance of 7.5Ohm maximum. This through-hole axial component operates across a temperature range of -55°C to 125°C and is compliant with ROHS3 standards. The product is currently obsolete, making identification of suitable substitute components essential for ongoing design requirements and production continuity.

Substiute Parts

74F185AP-RC

Bourns Inc.In Stock: 108174F185AP-RC Datasheet

Current PartRFQ

SC30180KT

TE Connectivity Passive ProductIn Stock: 1090SC30180KT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74F185AP-RC is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 18 µH (exact match required)
• Tolerance: ±10% (standard tolerance maintained)
• Mounting type: Through hole axial configuration
• Package compatibility: Axial form factor

Secondary Compatibility Factors:

• Current rating: Substitute must meet or exceed 100 mA minimum requirement
• DC resistance: Lower DCR values are acceptable and provide performance improvement
• Operating temperature range: Substitute must support minimum -55°C to 100°C (overlapping range acceptable)
• RoHS compliance: ROHS3 certification required for regulatory alignment

The SC30180KT from TE Connectivity Passive Product qualifies as a substitute based on matching inductance, tolerance, mounting type, and package configuration while exceeding current rating specifications.

Parameter Comparison

Engineering Selection Recommendations

The SC30180KT serves as a functional substitute for the obsolete 74F185AP-RC based on the following engineering criteria:

Compliance & Regulatory Alignment: Both components maintain ROHS3 compliance, ensuring regulatory continuity in applications subject to hazardous substance restrictions.

Electrical Performance: The SC30180KT exceeds the current rating requirement (239 mA versus 100 mA) and provides superior DC resistance characteristics (3.1Ohm versus 7.5Ohm maximum), resulting in reduced power dissipation and improved thermal performance in the application circuit.

Physical Compatibility: Both inductors utilize through-hole axial mounting and maintain the same inductance value and tolerance specification. The SC30180KT exhibits a smaller physical footprint (4.20mm x 10.00mm versus 5.08mm x 12.70mm), which may provide layout advantages in space-constrained designs.

Operational Considerations: The SC30180KT operates across -55°C to 100°C, which overlaps the lower temperature range of the original component. Applications requiring operation above 100°C must evaluate thermal requirements independently. The SC30180KT incorporates shielding, which may alter electromagnetic coupling characteristics in sensitive circuit topologies.

Frequently Asked Questions (FAQ)

Q: Can the SC30180KT directly replace the 74F185AP-RC in all applications?

A: The SC30180KT matches the critical electrical parameters (18 µH inductance, ±10% tolerance) and mounting configuration required for substitution. However, the maximum operating temperature differs (100°C versus 125°C). Applications operating above 100°C require alternative component selection. The shielded construction of the SC30180KT may affect electromagnetic coupling in circuits sensitive to shielding characteristics.

Q: What is the significance of the lower DC resistance in the SC30180KT?

A: The SC30180KT exhibits 3.1Ohm maximum DC resistance compared to 7.5Ohm maximum in the 74F185AP-RC. Lower DC resistance reduces resistive losses and heat generation during operation, improving efficiency in current-carrying applications. This represents a performance enhancement for the substitute component.

Q: Are there physical installation differences between these components?

A: Both components utilize through-hole axial mounting and are compatible with standard PCB layouts designed for axial inductors. The SC30180KT is physically smaller (4.20mm x 10.00mm versus 5.08mm x 12.70mm), which may require minor PCB layout adjustments but generally provides improved space utilization.

Q: Does the shielded construction of the SC30180KT affect circuit performance?

A: Shielding reduces electromagnetic radiation and susceptibility to external interference. In applications where the original unshielded design was intentional for coupling purposes, the shielded substitute may alter circuit behavior. Circuit validation is necessary for applications dependent on specific electromagnetic coupling characteristics.

Q: What is the current rating significance for this substitution?

A: The SC30180KT is rated for 239 mA, exceeding the 100 mA requirement of the 74F185AP-RC. This higher rating provides design margin and allows the component to operate at lower stress levels in the application, potentially improving reliability and thermal performance.