LT1181A - Low Power 5V RS232 Dual Driver/Receiver with 0.1µF Capacitors


  • ESD Protection over ±10kV
  • Uses Small Capacitors: 0.1µF
  • 120kBaud Operation for RL = 3k, CL = 2500pF
  • 250kBaud Operation for RL = 3k, CL = 1000pF
  • Outputs Withstand ±30V Without Damage
  • CMOS Comparable Low Power: 40mW
  • Operates from a Single 5V Supply
  • Rugged Bipolar Design
  • Outputs Assume a High Impedance State When Off or Powered Down
  • Meets All RS232 Specifications
  • Available With or Without Shutdown
  • Absolutely No Latch-up
  • Available in SO Package

Typical Application

LT1181A Typical Application
LT1181A Typical Application


The LT®1180A/LT1181A are dual RS232 driver/receiver pairs with integral charge pump to generate RS232 voltage levels from a single 5V supply. These circuits feature rugged bipolar design to provide operating fault tolerance and ESD protection unmatched by competing CMOS designs. Using only 0.1µF external capacitors, these circuits consume only 40mW of power, and can operate to 120k baud even while driving heavy capacitive loads. New ESD structures on the chip allow the LT1180A/LT1181A to survive multiple ±10kV strikes, eliminating the need for costly TransZorbs® on the RS232 line pins. The LT1180A/LT1181A are fully compliant with EIA RS232 standards. Driver outputs are protected from overload, and can be shorted to ground or up to ±30V without damage. During shutdown or power-off conditions, driver and receiver outputs are in a high impedance state, allowing line sharing.

The LT1181A is available in 16-pin DIP and SO packages. The LT1180A is supplied in 18-pin DIP and SO packages for applications which require shutdown.


For complete and up to date package information and drawings, please refer to our packaging page

SW-16, N-16

LT1181A Package Drawing
LT1181A Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1181ACN PDIP 16 C $3.08 $2.40 View
LT1181ACN#PBF PDIP 16 C $3.08 $2.40 View
LT1181ACSW SO 16 C $3.42 $2.65 View
LT1181ACSW#PBF SO 16 C $3.42 $2.65 View
LT1181ACSW#TR SO 16 C $2.71 View
LT1181ACSW#TRPBF SO 16 C $2.71 View
LT1181ADICE 0 View
LT1181AIN PDIP 16 I $4.00 $3.15 View
LT1181AIN#PBF PDIP 16 I $4.00 $3.15 View
LT1181AISW SO 16 I $4.42 $3.40 View
LT1181AISW#PBF SO 16 I $4.42 $3.40 View
LT1181AISW#TR SO 16 I $3.46 View
LT1181AISW#TRPBF SO 16 I $3.46 View
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* 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 Linear Technology sales office or authorized distributor.

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