Wide-voltage hot-swap control in an SOIC-8 footprint
The LT1641-1CS8#PBF is a single-channel hot swap controller from Analog Devices that manages board insertion into a live backplane. Its 9V to 80V supply range covers common telecom and industrial rails — 12V, 24V, 48V — without needing a separate bias supply. The controller does not integrate a pass FET (Internal Switch(s): No), so the external N-channel MOSFET and sense resistor set the current limit and power dissipation for the specific load. This gives the designer control over the thermal and electrical stress profile of the hot-swap event.
Programmable in-rush and fault handling
Five programmable features — Current Limit, Fault Timeout, OVP, Slew Rate, and UVLO — let the designer tailor the startup ramp, overvoltage threshold, and fault blanking to the downstream capacitance and load transient tolerance. The latched fault behavior (Features: Latched Fault) means the controller shuts off and stays off after a fault until the supply is cycled or the ON pin is toggled, preventing repeated stress on the external MOSFET. The 2 mA supply current (Current - Supply: 2 mA) is the controller's own draw; the pass FET's gate charge and switching losses are additional. In a 48V system with a 10 nF gate capacitance switching at a few hundred Hz, the total driver current stays well under 10 mA.
Package and temperature grade for board-fit decisions
The Tube packaging (Package: Tube) is the standard for prototype and low-volume builds. For reel-fed pick-and-place production, the tape-and-reel variant LT1641-1CS8#TRPBF (peer) uses the same die and electrical specs — the only difference is the shipping format.
RoHS3 compliance (rohsStatus: ROHS3 Compliant) covers the EU RoHS exemption list through 2024.