SF2425E

Overview

The RFMi SF2425E is a Surface Acoustic Wave (SAW) bandpass filter designed for signal conditioning applications. It operates at a center frequency of 868.6 MHz with a bandwidth of 1.5 MHz, covering a range of 868.1 to 869.1 MHz. The component features a 50 Ohm impedance and a maximum insertion loss of 3.5 dB. It supports a voltage rating of 5 V and utilizes an SMD/SMT termination type in an SM-3030-8 package. The device functions within a temperature range of -45°C to +125°C.

Feature Summary

• Surface Acoustic Wave technology for precise frequency filtering
• Designed for general-purpose RF signal conditioning
• Compact surface-mount packaging for board integration

Applications

• ISM band communication systems
• Wireless sensor networks
• Remote keyless entry systems

Procurement Notes

Verify the manufacturer source carefully, as the SF2425E has been produced by both Murata Electronics and RFMi. Confirm the specific datasheet version and pinout compatibility before procurement, as specifications such as insertion loss and voltage ratings may vary between manufacturers. Ensure the selected variant matches the required package dimensions and thermal characteristics for the target application.

Selection Notes

Select this component when a narrow 1.5 MHz bandwidth is required around 868 MHz. Compare insertion loss values from different suppliers, as reported data ranges from 2.65 dB to 3.5 dB. Verify the voltage rating requirement, noting that some sources specify 5 V while others indicate 3 V limits. Ensure the SM-3030-8 package footprint aligns with the PCB design constraints.

Part Context

The SF2425E belongs to the SF series of SAW filters, which are widely used in RF front-end modules. This specific model targets European ISM bands. Availability varies significantly between original equipment manufacturers like Murata and secondary producers like RFMi. Designers must cross-reference electrical parameters strictly with the provided datasheet due to potential discrepancies in published specifications across different supply channels.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult official manufacturer catalogs for direct replacements or equivalent SAW filters with matching 868 MHz center frequencies and similar bandwidth requirements.