RFM offers a full set of custom embedded wireless networking solutions like Zigbee wireless mesh sensor networks, RF modules, IC transceiver, IC transmitters and IC receivers. RFM, Inc. manufactures low power wireless and RF radio modules, wireless mesh nodes for distributed sensing on distributed sensor networks. Low Power radio, n../arrowband and short range devices, front end saw filters, active RFID, RFIC, coupled resonator filters, single silicon chips in the 70MHZ and 300-1000Mhz range.

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RF Components
Products Guide



Wireless Device
Selection Guide

SF2079D

3.8x3.8mm case		 251 MHz SAW Filter - IF

Click here if you need additional technical information,
to inquire about samples or to discuss your custom needs.

• Low Insertion Loss
• 3.8 X 3.8 mm Surface-Mount Case
• Single Ended Input and Output
• Complies with Directive 2002/95/EC (RoHS)
Click here if you need additional technical information,
to inquire about samples or to discuss your custom needs.

download data sheet Rev Date 06/05/07

download RoHS Statement

download Package Specs

  • Specs
  • AppNotes
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Electrical Characteristics
Characteristic Symbol Minimum Typical Maximum Units
Nominal Center Frequency fC 251.045 MHz
Insertion Loss 15.5 17.5 dB
Amplitude Ripple (p-p) Fc-6.250 to Fc-4.3925 MHz 0.7 1.5 dB
Fc-4.3925 to Fc-2.535 MHz 0.5 1.5 dB
Fc-2.5350 to Fc-0.025 MHz 0.8 1.5 dB
Fc+0.025 to Fc+2.535 MHz 0.9 1.5 dB
Fc+2.5350 to Fc+4.3925 MHz 0.5 1.5 dB
Fc+4.3925 to Fc+6.250 MHz 0.6 1.5 dB
Pass bandwidth of -1.5dB 13.9 MHz
Pass bandwidth of -3dB 14.5 MHz
Low side attenuation Fc<(Fc-16.5 MHz) 33 37 dB
Low side attenuation between: (Fc-16.5 MHz)...(Fc-10.5 MHz) 28 32 dB
High side attenuation between: (Fc+9.0 MHz)...(Fc+16.5 MHz) 24 30 dB
High side attenuation Fc>(Fc+16.5 MHz) 35 40 dB
Temperature Coefficient of frequency -18 ppm/K
Delay Ripple (p-p) Fc-6.250 to Fc-4.3925 MHz 45 70 ns
Fc-4.3925 to Fc-2.535 MHz 25 70 ns
Fc-2.5350 to Fc-0.025 MHz 20 90 ns
Fc+0.025 to Fc+2.535 MHz 15 90 ns
Fc+2.5350 to Fc+4.3925 MHz 25 70 ns
Fc+4.3925 to Fc+6.250 MHz 45 90 ns
Terminating Source / Load Impedance: ZIN / ZOUT 150 Ohms
Operating Temperature Range -40 +85 °C

Application Notes                                                                                                 see All Product Application Notes
    AN0909
    Recommended Reflow Profile for RFM XTC Series TCXOs
    AN0910
    Recommended Reflow Profile for RFM SAW Resonators and SAW Filters
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