+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins

Ideal for Data Cable Applications

Please check latest availability status for a specific part variant.


The MAX3380E/MAX3381E are +2.35V to +5.5V-powered EIA/TIA-232 and V.28/V.24 communication interfaces with low power requirements, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection on both the TTL and RS-232 sides. The MAX3380E/MAX3381E have two receivers and two transmitters. All RS-232 inputs, outputs, and logic input pins are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge method and the Human Body Model, and ±8kV using IEC 1000-4-2 Contact Discharge method.

The proprietary low-dropout transmitter output stage enables true RS-232 performance from a +3.1V to +5.5V supply with a dual charge pump. The parts reduce the transmitter output levels to RS-232-compatible levels with no increase in supply current for supplies less than +3.1V and greater than +2.35V. The +2.35V to +5.5V operating range is fully compatible with lithium-ion (Li+) batteries. The charge pump requires only four small 0.1µF capacitors for operation.

The MAX3380E/MAX3381E transceivers use Maxim's revolutionary AutoShutdown Plus™ feature to automatically enter a 1µA shutdown mode. These devices shut down the on-board power supply and drivers when they do not sense a valid signal transition for 30 seconds on either the receiver or transmitter inputs.

The MAX3380E is capable of transmitting data at rates of 460kbps while maintaining RS-232 output levels, and the MAX3381E operates at data rates up to 250kbps. The MAX3381E offers a slower slew rate for applications where noise and EMI are issues. The MAX3380E/MAX3381E have a unique VL pin that allows interoperation in mixed-logic voltage systems down to +1.65V. Both input and output logic levels are referenced to the VL pin. The MAX3380E/MAX3381E are available in a space-saving TSSOP package.
MAX3380E, MAX3381E: Typical Operating Circuit MAX3380E, MAX3381E: Typical Operating Circuit Enlarge+

Key Features

  • ±15kV ESD Protection on All CMOS and RS-232 Inputs and Outputs (Except active-low INVALID)
    • ±15kV Human Body Model
    • ±15kV IEC 1000-4-2 Air-Gap Discharge
    • ±8kV IEC 1000-4-2 Contact Discharge
  • Operates Over Entire Li+ Battery Range
  • Low Logic Threshold Down to +1.65V for Compatibility with Cell Phone Logic Supply Voltages
  • 1µA Low-Power AutoShutdown Plus Mode
  • Compatible with Next-Generation GSM Data Rates
  • 20-Pin TSSOP Package


  • Cellular Data Cables
  • Digital Still Cameras
  • GPS Receivers
  • PDA Data Lump Cables
Part NumberVSUPPLY
TxRxData Rate
Internal Charge PumpExt. CapsCap. Value
ESD Protect.
Rx Active in ShutdnPackage/PinsBudgetary
mintypnomSee Notes
$3.63 @1k
MAX3381E 250
See All RS-232 Line Driver/Receivers (136)
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 3741 Analog ICs for Low Voltage Systems
Tutorial 2020 Choosing the Right RS-232 Transceiver
App Note 882 RS-232 Features Explained

Quality and Environmental Data

Product Reliability Reports: MAX3380E.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX3380ECUP+
  • MAX3380ECUP+T
  • MAX3380EEUP+
  • MAX3380EEUP+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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