RF Transmitters
  • SX1223
  • Single-Chip Multi-Channel Low-Power UHF RF Transmitter
  • SX1230
  • +17dBm RF Transmitter, 315/433/868/915MHz
  • SX1243
  • Low cost, low current +10dBm RF Transmitter, 310-928MHz
Semtech SX1240

Semtech SX1240

Low cost, low current RF Transmitter +10dBm, 433/868MHz

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The SX1240 is an ultra-low-cost, fully integrated FSK or OOK compatible transmitter suitable for operation in the 418, 434 and 868 MHz license free ISM bands.


  • +10 dBm or 0 dBm Configurable output power
  • Bit rates up to 100 kbps
  • FSK and OOK modulation
  • 2 Preconfigured Modes for Operation without MCU 433.92 MHz OOK & 868.3 MHz FSK
  • 1.8 to 3.7 V supply range
  • Low BOM Fully Integrated Tx
  • 8 Selectable Centre Frequencies
  • Programmable Frequency Tuning of low cost XTAL


  • Low-Cost Consumer Electronic Applications
  • Remote Keyless Entry (RKE)
  • Remote Control / Security Systems
  • Audio Accessories
  • Process and building / home control
  • Active RFID


  • SOIC8-EP

Order Codes

  • SX1240ISTRT- Pb-Free, Halogen Free, RoHS/WEEE compliant product
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