S1812-274G

Fixed Inductors Overview

The Delevan S1812-274G is a shielded surface-mount RF inductor designed for high-frequency applications. It features an inductance of 270 µH with a tight tolerance of ±2%. The component operates with a maximum DC current of 135 mA and exhibits a maximum DC resistance of 11 Ohms. Its self-resonant frequency is specified at 6 MHz, ensuring stable performance within its operational bandwidth. The unit utilizes a standard 1812 (4532 metric) package footprint, measuring 4.8 mm in length, 3.4 mm in width, and 3.4 mm in height. It is supplied in reel packaging for automated assembly processes.

Fixed Inductors Feature Summary

• Shielded construction minimizes electromagnetic interference and crosstalk in dense circuit layouts.
• High Q-factor ensures efficient energy storage and low signal loss in RF circuits.
• Standard SMD/SMT termination facilitates reliable PCB mounting and automated placement.

Fixed Inductors Applications

• RF filtering networks
• Impedance matching circuits
• Choke applications in radio frequency systems

Fixed Inductors Procurement Notes

Verify the specific manufacturer designation, as API Delevan assets may be managed by different entities. Confirm RoHS compliance status directly with the supplier, as historical data indicates potential variations between leaded and compliant versions. Ensure the ordering suffix matches the required tolerance and packaging format. Cross-reference the Mouser part number 807-S1812-274G or DigiKey listings to validate current availability and exact datasheet revisions before finalizing procurement orders.

Fixed Inductors Selection Notes

Select this component when a precise 270 µH inductance is required in a compact 1812 footprint. The 135 mA current rating suits low-power RF stages where higher saturation currents are unnecessary. The shielded design is critical for preventing magnetic coupling with adjacent components. Compare the 11 Ohm DC resistance against power loss constraints in the specific circuit path. Ensure the 6 MHz self-resonant frequency aligns with the target operating band to avoid parasitic resonance issues.

Fixed Inductors Part Context

This part belongs to the S1812/R series of fixed RF inductors manufactured by Delevan. The series offers various inductance values within the same physical envelope, allowing for standardized board designs across different product variants. These components are engineered specifically for radio frequency environments, distinguishing them from general-purpose power inductors through their focus on Q-factor and self-resonant frequency characteristics rather than high-current handling.

Fixed Inductors Replacement Considerations

Direct substitutes include other shielded 1812 RF inductors with identical 270 µH nominal value and ±2% tolerance. Verify that alternative parts maintain similar DC resistance and current ratings to prevent thermal or saturation mismatches. Check if the replacement offers comparable self-resonant frequency performance. Note that some distributors list equivalent parts under different manufacturer branding due to asset transfers.