Alternative Parts


Features and Benefits

  • Allows Safe Board Insertion and Removal from a Live Backplane
  • Controls Supply Voltage from 9V to 80V
  • Programmable Analog Foldback Current Limiting
  • High Side Drive for an External N-Channel
  • Latched Operation Mode (LT1641-1)
  • Automatic Retry (LT1641-2)
  • User Programmable Supply Voltage Power-Up Rate
  • Undervoltage Lockout
  • Overvoltage Protection
  • Both are available in 8-Lead SO Package

Product Details

The LT1641-1/LT1641-2 are 8-pin Hot Swap controllers that allow a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped up at a programmable rate. A high side switch driver controls an N-channel gate for supply voltages ranging from 9V to 80V.

The chips feature a programmable analog foldback current limit circuit. If the chips remain in current limit for more than a programmable time, the N-channel pass transistor is either latched off (LT1641-1) or is set to automatically restart after a time-out delay (LT1641-2).

The PWRGD output indicates when the output voltage, sensed by the FB pin, is within tolerance. The ON pin provides programmable undervoltage lockout.

The LT1641-1/LT1641-2 are available in the 8-lead SO package.


  • Hot Board Insertion
  • Electronic Circuit Breaker
  • Industrial High Side Switch/Circuit Breaker
  • 24V/48V Industrial/Alarm Systems

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.

Evaluation Kits (3)

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Models for the following parts are available in LTspice:


Product Recommendations

LT1641-1 Companion Parts

Recommended Related Parts

Reference Materials

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.

Support & Discussions

LT1641-1 Discussions

RE: AD9364 Tx Image
1 day(s) ago in Design Support AD9361/AD9363/AD9364
RE: LTSpice .raw data format
1 day(s) ago in Design Tools and Calculators
RE: ADuCM355 32MHz Crystal
2 day(s) ago in Precision Microcontrollers

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

Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.