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

SF2190B

7.0x5.0mm case
138 MHz SAW Filter - RF

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


• Small Size
• Hermetic 5 X 7 mm Surface-mount Case
• Differential Input/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 03/23/10

download RoHS Statement

download Package Specs

  • Specs
  • AppNotes
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Electrical Characteristics
Characteristic Symbol Minimum Typical Maximum Units
Center Frequency FC 138 MHz
Insertion Loss IL 18.8 21.0 dB
1 dB Bandwidth 60 63 MHz
3 dB Bandwidth 65.4 MHz
Amplitude Ripple Across 1 dB Bandwidth 0.6 1.2 dBP-P
Upper -35 dB Band Edge 176 179 MHz
Lower -35 dB Band Edge 97 101 MHz
Ultimate Rejection 35 40 dB
Temperature Coefficient -72 ppm/°C
Source Impedance, Balanced 50 ohm
Load Impedance, Balanced 50 ohm

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