CompactPCI hot-swap sequencing — four rails, one controller
Programmable current limit, fault timeout, and slew rate give the board designer control over the turn-on profile. The controller latches off on fault and includes thermal limit and undervoltage lockout (UVLO) protection. The industrial temperature range (-40°C to 85°C) suits it for outdoor telecom cabinets, factory-floor CompactPCI chassis, and other environments where the backplane sees ambient temperature swings beyond commercial-grade limits.
Industrial temp vs commercial — the -1IGN suffix matters
The closest functional peer is the LTC1643AL-1CGN#PBF, which shares the same 4-channel architecture, internal switches, programmable features, and 200mA/500mA output split. The deciding difference is the temperature grade: the -1CGN variant is specified for 0°C to 70°C (commercial), while this -1IGN part is rated for -40°C to 85°C (industrial). For a CompactPCI system deployed in a temperature-controlled server room, the commercial part fits. For a chassis in an unventilated enclosure, a factory floor, or an outdoor shelter, the -1IGN is the correct ordering code.
Active status — no last-time-buy pressure
The LTC1643AL-1IGN#PBF carries an Active lifecycle status with ROHS3 compliance. There is no NRND notice or last-time-buy window on this part.