What this current-sense amp does on the board
The LT6105CDCB#TRMPBF is a dedicated current-sense amplifier from Analog Devices, built to measure current through a shunt resistor on supply rails from 2.85 V up to 36 V. It's a single-circuit device with a 100 kHz bandwidth and a 2V/µs slew rate, which means it's fast enough for DC load monitoring and low-speed overcurrent detection, but not for tracking fast-switching currents like those in a buck converter's inductor. The 240 µA supply current keeps the thermal load low on a 24 V rail.
Supply rails and temperature — where it fits
The 2.85 V to 36 V supply span is the headline: it lets you use the same part across low-voltage digital rails and higher-voltage analog buses without a separate regulator. The input offset voltage is 100 µV, which sets the floor for the minimum measurable shunt voltage — a 10 mΩ shunt carrying 1 A gives 10 mV, so the offset contributes 1% error at that point. That locks this part into indoor, temperature-controlled environments — think benchtop instruments, server power supplies, or office equipment. If your board lives in an engine bay or an outdoor cabinet, you need the automotive-grade AD8207WBRZ-RL, which covers -40°C to 125°C.
Package and footprint realities
The LT6105CDCB#TRMPBF comes in a 6-WFDFN exposed pad package, supplier device package 6-DFN (2x3). Without that, the part's junction temperature rises faster under load, and the output current capability of 1 mA per channel may derate. The part is supplied in Tape & Reel (TR) or Cut Tape (CT) options, surface-mount only. The ROHS3 compliance is listed, so no lead-free process conflict with modern assembly lines.
Lifecycle and sourcing posture
For volume procurement, the part is quoted to order against your BOM quantity. No official second-source is listed, but the AD8276BRZ-R7 is a differential amplifier with similar supply range (2.0 V to 36 V) and 550 kHz bandwidth — it's not a pin-compatible swap, but it can serve a similar function in a redesign.