Features and Benefits

  • On-Chip ESD Protection:
    • ±15kV Human Body Model
    • ±15kV IEC-1000-4-2 Air Gap Test**
    • ±8kV IEC-1000-4-2 Contact Test
  • 125kBd Operation with 3kΩ/2500pF Load
  • 250kBd Operation with 3kΩ/1000pF Load
  • Operates from ±5V to ±15V Supplies
  • Fully Protected Against Overload
  • Outputs Can Be Driven ±30V Without Damage
  • Three-State Outputs; Outputs Open When Off
  • Bipolar Circuit—No Latchup
  • ±30V Input Range
  • Triple Driver/Receiver
  • No Supply Current in Shutdown
  • 30kΩ Input Impedance
  • Meets All RS232 Specifications
  • 16-Pin Version—Pin Compatible with MC145406
  • Available in SO Package

Product Details

The LT1039A is a triple RS232 driver/receiver that includes shutdown. Each receiver will accept up to ±30V input and can drive either TTL or CMOS logic. The RS232 drivers accept TTL logic inputs and output RS232 voltage levels. The outputs are fully protected against overload and can be shorted to ground or up to ±30V without damage to the drivers. Additionally, when the system is shut down or power is off, the outputs are in a high impedance state allowing data line sharing. On-chip ESD protection eliminates the need for external protection devices. A bias pin allows one receiver to be kept on while the rest of the part is shut down.

A bias pin allows one receiver to be kept on while the rest of the part is shut down.

The LT1039A is also available in the 16-pin version, without shutdown or bias pin functions.

For applications requiring operation from a single 5V supply, see the LT1180A/LT1181A and LT1130A data sheets.


  • RS232 Interface
  • Terminals
  • Modems

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

Sample & Buy

Sample & Buy functionality exists in desktop site
Check Inventory

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

Price Table Help