3-Driver/5-Receiver Intelligent RS-232 Transceiver with 1.65V-5.5V Interface


The XR32431 is a 3 driver/ 5 receiver RS-232 transceiver. The XR32431 features a variable low voltage logic interface, down to 1.65V. This product is intended for portable or hand-held applications such as notebook and palmtop computers. The XR32431EB features slew-rate limited outputs for reduced crosstalk and EMI. The XR32431EH is optimized for mid speed applications, with data rates up to 460Kbps. The XR32431EU is optimized for high speed designs with data rates up to 1Mbps, easily meeting the demands of high speed RS-232 applications.

The XR32431 uses an internal high-efficiency charge-pump power supply that requires only four 0.1μF capacitors in 3.3V operation. This charge pump combined with Exar's driver architecture allow the XR32431 to deliver compliant RS-232 performance from a single power supply ranging from +3.0V to +5.5V.

The AUTO ON-LINE® feature allows the device to automatically "wake-up" during a shutdown state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise, the device automatically shuts itself down drawing less than 1μA.

For technical support or help choosing a product please email Exar’s Serial Technical Support group at:  serialtechsupport@exar.com.
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  • 1.65V to 5.5V Logic Interface VL pin
  • Small 5mm x 5mm 32-pin QFN package
  • AUTO ON-LINE circuitry automatically wakes up from a 1µA shutdown
  • Interoperable with EIA/TIA-232 and adheres to EIA/TIA-562 down to a +2.7V power source
  • Enhanced ESD Specifications:
    • ±15kV Human Body Model
    • ±15kV IEC1000-4-2 Air Discharge
    • ±8kV IEC1000-4-2 Contact Discharge
  • 250Kbps/460Kbps/1Mbps min transmission rates (speed grades B/H/U)
  • Meets true EIA/TIA-232-F Standards from a +3.0V to 5.5V power supply
  • Regulated Charge Pump yields stable RS-232 Outputs regardless of VCC variations
  • -40°C to 85°C ambient operating temperature


  • Industrial and Single Board Computers
  • Industrial and Process Control Equipment
  • Point-Of-Sales Equipment
  • Building Security and Automation

Design Tools

Technical Library


Pkg Code Details Quantities Dimensions PDF
QFN32 5x5
  • JEDEC Reference: MO-220
  • MSL Pb-Free: L2 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 22.4ºC/W
  • Bulk Pack Style: ¹Canister
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 3000
  • Quantity per Tube: n/a
  • Quantity per Tray: ²490
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: mm
  • Length: 5.00
  • Width: 5.00
  • Thickness: 0.90
  • Lead Pitch: 0.50

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR32431EBCR-F QFN32 5x5 0 70 EOL
XR32431EBCRTR-F QFN32 5x5 0 70 EOL
XR32431EBER-F QFN32 5x5 -40 85 EOL
XR32431EBERTR-F QFN32 5x5 -40 85 EOL
XR32431EHCR-F QFN32 5x5 0 70 EOL
XR32431EHCRTR-F QFN32 5x5 0 70 EOL
XR32431EUCR-F QFN32 5x5 0 70 EOL
XR32431EUCRTR-F QFN32 5x5 0 70 EOL Suggested:
Show obsolete parts
Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
Distribution Date Description File
07/11/2017 Product Discontinuation Notification PDN_17-0626-02-1033.pdf
07/11/2017 Product Discontinuation Notification Product Discontinuation Notice 17-0623-02 r-1033.pdf