SF1142B

Overview

The SF1142B is a Surface Acoustic Wave (SAW) filter manufactured by RFMi. It operates at a nominal center frequency of 315 MHz, with a defined frequency range spanning from 312.75 MHz to 317.25 MHz. The device features a bandwidth of 4.5 MHz and an impedance of 250 Ohms. It is rated for a maximum voltage of 30 V. The component is housed in a 10-SMD, no-lead package.

Feature Summary

• Surface Acoustic Wave technology for signal filtering
• Designed for specific intermediate frequency applications
• SMD package configuration for surface mount assembly

Applications

• SDARS RF signal processing
• Intermediate frequency filtering in radio systems
• 315 MHz band communication devices

Procurement Notes

Verify the manufacturer designation as RFMi or Akoustis, as documentation sources may vary. Confirm the package type is 10-SMD without lead. Ensure the electrical specifications match the required 315 MHz center frequency and 250 Ohm impedance for your circuit design before ordering.

Selection Notes

Select this component when a SAW filter is required for 315 MHz applications. The 250 Ohm impedance must match the system requirements. The 4.5 MHz bandwidth defines the passband characteristics. Verify compatibility with SDARS or similar IF signal processing needs.

Part Context

This component belongs to the SAW filter category, specifically tuned for the 315 MHz frequency band. It serves as a passive electronic component used to select or reject specific frequencies within a signal path. The technology relies on acoustic wave propagation for filtering.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-referencing requires matching the 315 MHz center frequency, 4.5 MHz bandwidth, 250 Ohm impedance, and 10-SMD package dimensions.