3V to 5.5V, IrDA Infrared Transceiver with Integrated RS-232 Interface

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The MAX3130/MAX3131 combine an IrDA 1.2 compatible infrared transceiver with an RS-232 interface-all in a single 3V-powered hybrid microcircuit. The infrared transceiver supports IrDA data rates of 2.4kbps to 115kbps. The infrared receive channel provides a high-gain/low-noise PIN-diode amplifier with 100µA of ambient photodiode current rejection at a +3V supply. A high-power LED driver capable of sinking 200mA is included in the infrared transmit path. The on-board encoder/decoder (ENDEC) compresses/stretches signals to and from the external UART, allowing IrDA communication even with non-IrDA UARTs.

A 2-driver/2-receiver RS-232 transceiver supports data rates up to 120kbps. A proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single +3.0V to +5.5V supply. Selectable shutdown for IR and RS-232 circuitry reduces supply current to 1µA.

The MAX3130 is optimized for applications using a single UART for both infrared and RS-232 communication. The infrared transmitter input and infrared receiver output are multiplexed with one RS-232 transmitter input and one RS-232 receiver output, respectively. The MAX3131's IrDA transceiver and RS-232 transceivers are separate and have their own data inputs and outputs.

Both these devices require a minimum of external components: four small 0.1µF capacitors, a photodiode, an infrared LED, and a current-setting resistor.
MAX3130, MAX3131: Pin Configuration MAX3130, MAX3131: Pin Configuration Enlarge+

Key Features

  • Integrated RS-232 and IrDA in Single 28-Pin SSOP Package
  • 370µA Supply Current
  • IrDA 1.2 Compatible: 2.4kbps to 115kbps Data Rate
  • On-Board IR Encoder/Decoder Allows Use of Non-IrDA UARTs
  • +3.0V to +5.5V Single-Supply Operation
  • Meet EIA/TIA-232 Specifications Down to +3V
  • 200mA, High-Current Infrared LED Drive
  • 1µA Low-Power Shutdown with RS-232 Receivers Active


  • Battery-Powered Applications
  • Cell Phones
  • Handheld Equipment
  • IrDA Applications
  • Palmtop Computers
  • PDAs and Other Handheld Devices
  • Peripherals
Part NumberFunctionsVSUPPLY
Data Rate
Single Ended TxSingle Ended RxShutdnµP I/FICC
ICC (Shutdown)
maxmaxSee Notes
MAX3130 IrDA/RS-232 Transceiver3.0 to 5.5115.222YesTTL/CMOS110
$4.45 @1k
$7.49 @1k
See All Appletalk and IrDA (4)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 3024 IrDA and RS-232: A Match Made in Silicon

Quality and Environmental Data

Request Reliability Report for: MAX3130 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX3130CAI+
  • MAX3130EAI+
  • MAX3130EAI+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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