Zero-drift current sense for tight loops
The Texas Instruments INA186A3IDDFT is a single-channel, Zero-Drift current sense amplifier in a TSOT-23-8 package. It measures current across a shunt resistor on either the high side or low side of the supply rail, outputting a rail-to-rail voltage proportional to the sensed current. The Zero-Drift architecture keeps input offset voltage at 3 µV and input bias current at 500 pA, so the reading stays accurate even when the shunt drop is only a few millivolts. Supply current is 48 µA, which makes it a fit for battery-powered controllers and field transmitters where every microamp is budgeted. The 45 kHz gain-bandwidth product and 0.3 V/µs slew rate are sized for DC and low-frequency AC current monitoring — motor-phase currents, solenoid loads, or power-supply output rails — not for fast-switching waveforms.
Supply range and temperature grade
The part operates from a single supply between 1.7 V and 5.5 V. The -40°C to 125°C temperature range qualifies it for under-hood automotive, industrial motor-drive cabinets, and outdoor telecom enclosures where ambient heat is the constraint.
Package and mounting
Housed in a TSOT-23-8 (SOT-23-8) surface-mount package. The small footprint suits dense PCB layouts on sensor modules or battery-management boards. Standard reflow profiles for lead-free solder apply; no special handling beyond normal MSL precautions.
Sourcing and lifecycle
The INA186A3IDDFT is an active, current-production part from Texas Instruments, ROHS3 compliant. No end-of-life notice or last-time-buy window is on record. It is sourced through independent distribution and quoted to order against an RFQ — availability and current pricing are confirmed at quote time. For dual-sourcing or a higher-bandwidth option, the INA254A1IPWAR (350 kHz, 2.4 V/µs) is a pin-compatible alternative within the same Zero-Drift family, though it draws more supply current.