18M681K Equivalent & Substitute Parts

Part Overview

The 18M681K is a 6.8 µH unshielded molded inductor manufactured by Gowanda Electronics, designed for RF applications requiring axial through-hole mounting. This component operates across a temperature range of -55°C to 105°C with a current rating of 560 mA and maximum DC resistance of 375 mOhm. The part maintains active product status with 889 units currently in stock. Equivalent parts are identified when identical electrical specifications and mechanical compatibility are maintained across inductance value, tolerance, current rating, DC resistance, and package configuration.

Substiute Parts

18M681K

Gowanda ElectronicsIn Stock: 91118M681K Datasheet

Current PartRFQ

1840-26K

API Delevan Inc.In Stock: 19571840-26K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 1840-26K from API Delevan Inc. qualifies as a direct substitute based on the following critical parameters:

Inductance value matches at 6.8 µH with identical ±10% tolerance. DC resistance specification is equivalent at 375 mOhm maximum. Current rating of 580 mA exceeds the main part requirement of 560 mA, providing operational margin. Shielding configuration is unshielded in both parts. Operating temperature range is identical at -55°C to 105°C. Mounting type and package configuration are both through-hole axial. Inductance test frequency matches at 7.9 MHz. Physical dimensions are comparable: main part measures 0.188" Dia × 0.438" L (4.78mm × 11.13mm) versus substitute at 0.187" Dia × 0.437" L (4.75mm × 11.10mm).

Parameter Comparison

Engineering Selection Recommendations

Both the 18M681K and 1840-26K maintain active product status. The 18M681K carries RoHS Not Applicable status, while the 1840-26K is RoHS non-compliant. Selection between these parts depends on application compliance requirements. The 1840-26K offers higher Q factor (35 versus 30 at 7.9 MHz) and increased current rating (580 mA versus 560 mA), providing performance margin in RF applications. Packaging differs between tape and reel for the main part and cut tape for the substitute, affecting procurement and assembly workflows. Both parts share identical electrical core specifications and mechanical compatibility for through-hole axial mounting.

Frequently Asked Questions (FAQ)

Q: Can the 1840-26K directly replace the 18M681K in production?

A: Direct replacement is possible when electrical specifications and mechanical fit are the primary concerns. Both parts share identical inductance (6.8 µH), tolerance (±10%), DC resistance (375 mOhm max), operating temperature range (-55°C to 105°C), and axial through-hole package configuration. The 1840-26K provides higher current rating (580 mA versus 560 mA) and improved Q factor (35 versus 30 at 7.9 MHz). Compliance requirements must be evaluated independently based on application needs.

Q: What are the key electrical parameters that define substitution eligibility?

A: Inductance value, tolerance, DC resistance, current rating, shielding type, and operating temperature range are the primary electrical parameters. Both parts maintain 6.8 µH inductance with ±10% tolerance, 375 mOhm maximum DC resistance, unshielded configuration, and -55°C to 105°C operating range. Current rating of the substitute (580 mA) exceeds the main part requirement (560 mA).

Q: Are there packaging or form factor differences?

A: Both parts use axial through-hole mounting with comparable physical dimensions. The 18M681K measures 0.188" Dia × 0.438" L (4.78mm × 11.13mm), while the 1840-26K measures 0.187" Dia × 0.437" L (4.75mm × 11.10mm). Packaging format differs: the main part is supplied in tape and reel, while the substitute is supplied in cut tape.

Q: How do compliance certifications differ between these parts?

A: Both parts share REACH Unaffected and EAR99 ECCN classifications. The 18M681K carries RoHS Not Applicable status, while the 1840-26K is RoHS non-compliant. Applications requiring RoHS compliance should specify the 18M681K.