74F686AP-RC Equivalent & Substitute Parts

Part Overview

The 74F686AP-RC is a 6.8 µH unshielded wirewound inductor manufactured by Bourns Inc., rated for 300 mA maximum current with 1.85Ohm DC resistance. This through-hole axial component operates across -55°C to 125°C and is classified as obsolete. Due to its obsolete status, identifying equivalent substitute parts with matching electrical and mechanical specifications is essential for design continuity and procurement planning.

Substiute Parts

74F686AP-RC

Bourns Inc.In Stock: 86174F686AP-RC Datasheet

Current PartRFQ

B82144A2682K000

EPCOS - TDK ElectronicsIn Stock: 976B82144A2682K000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74F686AP-RC is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 6.8 µH with ±10% tolerance
• Mounting type: Through hole axial configuration
• Shielding type: Unshielded
• Operating temperature range: -55°C to 125°C minimum
• RoHS3 compliance for regulatory alignment

Secondary Compatibility Factors:

• Current rating must meet or exceed 300 mA
• DC resistance should remain within acceptable circuit performance limits
• Package/case form factor must be axial to ensure PCB compatibility
• Frequency characteristics at test frequency should support circuit operation

The B82144A2682K000 qualifies as a substitute based on matching inductance, tolerance, mounting type, shielding, temperature range, and RoHS compliance. Differences in current rating, DC resistance, and core material are secondary considerations that must be evaluated within specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

The B82144A2682K000 is suitable as a substitute for the 74F686AP-RC based on the following engineering factors:

Compliance and Status: The substitute part maintains ROHS3 compliance, matching the regulatory requirements of the original component. The active product status of the B82144A2682K000 ensures ongoing availability and supply chain stability, addressing the obsolescence of the 74F686AP-RC.

Electrical Compatibility: Both parts share identical inductance values (6.8 µH) and tolerance specifications (±10%), ensuring equivalent circuit performance at the specified inductance frequency test point. The substitute's current rating of 1.5 A exceeds the original 300 mA requirement, providing operational margin. The significantly lower DC resistance of the substitute (190mOhm versus 1.85Ohm) represents an improvement in power efficiency characteristics.

Physical and Thermal Compatibility: Axial through-hole mounting and unshielded configuration remain consistent between both parts. Operating temperature ranges are identical (-55°C to 125°C), supporting equivalent thermal performance. Physical dimensions are comparable, with minor variations in diameter and length that remain within typical PCB layout tolerances for axial components.

Frequently Asked Questions (FAQ)

Q: Can the B82144A2682K000 directly replace the 74F686AP-RC in existing designs?

A: Yes, the B82144A2682K000 meets the primary substitution criteria: matching inductance (6.8 µH ±10%), identical mounting type (through-hole axial), matching shielding (unshielded), and equivalent operating temperature range (-55°C to 125°C). Physical dimensions are comparable for standard PCB layouts.

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

A: The B82144A2682K000 exhibits 190mOhm DC resistance compared to the original 1.85Ohm. This lower resistance reduces power dissipation and heat generation in the inductor, generally improving circuit efficiency. Circuit designs should account for this difference if the original higher resistance was intentionally specified for damping or thermal management purposes.

Q: Does the higher current rating of the substitute affect compatibility?

A: No. The substitute's 1.5 A rating exceeds the original 300 mA specification, providing additional operational margin. This does not compromise compatibility; it represents an enhancement in current handling capability.

Q: Are there physical installation considerations when substituting these parts?

A: Physical dimensions differ slightly: the original measures 0.200" diameter × 0.500" length, while the substitute measures 0.205" diameter × 0.472" length. These variations are minimal for standard through-hole axial component placement and should not require PCB layout modifications.

Q: What is the difference between the core materials used in these inductors?

A: The 74F686AP-RC uses a phenolic core, while the B82144A2682K000 uses a ferrite drum core. Both are unshielded configurations. The ferrite core in the substitute may provide different frequency response characteristics; however, both parts meet the specified inductance and tolerance requirements at the test frequency.

Q: Is the substitute part RoHS compliant?

A: Yes, the B82144A2682K000 is ROHS3 compliant, matching the regulatory status of the original 74F686AP-RC.