Quad current-sense amp for multi-rail monitoring
The INA4181A2IPWR: With a -3 dB bandwidth of 210 kHz and a 2 V/µs slew rate, the part is sized for DC and low-frequency current sensing — adequate for load-current telemetry in motor drives, battery-management systems, and power-distribution boards, but not for high-speed transient capture above a few hundred kilohertz.
Supply range, temperature grade, and package
Operates from a single 2.7 V to 5.5 V supply, drawing 690 µA typical per amplifier — the quad draws about 2.76 mA total, which keeps the thermal budget low in a 20-TSSOP package. The -40°C to 125°C industrial temperature range covers under-hood automotive and factory-floor enclosures without active cooling. Housed in a 20-TSSOP (4.40 mm width) with a standard surface-mount footprint. The Tape & Reel packaging (also available as Cut Tape) is moisture-sensitive — store the reels dry per the MSL label on the reel, and bake before reflow if the floor life is exceeded.
Compliance and lifecycle planning
Input offset voltage is 100 µV typical, and input bias current is 75 µA — the bias is high because the inputs are designed for shunt voltages, not high-impedance sources. For a 10 mΩ shunt at 1 A full-scale, the 75 µA bias introduces less than 0.75 µV of additional error, negligible in practice.