INA240A1DR
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mfr | Texas Instruments |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 125°C |
| Current - Supply | 1.8mA |
| Output Type | - |
| Number of Circuits | 1 |
| Slew Rate | 2V/µs |
| Supplier Device Package | 8-SOIC |
| -3db Bandwidth | 400 kHz |
| Current - Input Bias | 90 µA |
| Amplifier Type | Current Sense |
| Voltage - Input Offset | 5 µV |
| Package | Tape & Reel (TR) |
| Product Status | Active |
| Base Product Number | INA240 |
| REACH Status | REACH Unaffected |
| Standard Package | 2,500 |
| ECCN | EAR99 |
| HTSUS | 8542.33.0001 |
| Voltage - Supply Span (Min) | 2.7 V |
| Voltage - Supply Span (Max) | 5.5 V |
INA240A1DR current-sense amplifier 1 circuit 8-SOIC
The INA240A1DR is a Texas Instruments bidirectional current-sense amplifier that measures voltage drops across a shunt resistor over a wide -4 V to 80 V common-mode range, independent of its own 2.7 V to 5.5 V supply, and is delivered in an 8-pin SOIC package rated for -40 C to 125 C operation with 2500 pieces per large tape-and-reel carrier . As the A1 gain variant of the INA240 family, it provides a fixed 20 V/V gain, uses a zero-drift architecture that allows full-scale sensing down to a 10 mV shunt drop, and draws a maximum quiescent current of 2.4 mA, making it a robust analog front end for precision current measurement in motor drives, power supplies, battery systems, and industrial control boards . The negative common-mode capability lets the device ride below ground to handle the flyback period of inductive loads, while the voltage-output stage feeds directly into an ADC or comparator without extra conditioning circuitry.
The INA240A1DR is widely used for inline, high-side, and low-side current sensing in three-phase brushless DC motor drives, H-bridge and solenoid or valve control, DC/DC and AC/DC power-supply feedback loops, battery-management charging and discharging monitoring, actuator and pressure-regulator control, and telecommunication equipment . In Class-D audio subsystems it serves as a high-dynamic-range speaker-current sensor for SmartAmp speaker-parameter extraction and overcurrent protection, while its clean PWM-step response makes it a natural fit for window-comparator overcurrent alarms and real-time diagnostic loops . Engineers also deploy it in electric-vehicle auxiliary modules, industrial PLC analog input cards, and test fixtures where sustained accuracy under high dV/dt transients is a hard requirement rather than a nice-to-have .
Alternative current sense amplifiers
● INA240A1PWR: Identical 20 V/V gain and electrical performance in an 8-pin TSSOP package for thinner, finer-pitch board layouts.
● INA253: Drop-in bi-directional amplifier with an integrated 2 mOhm low-inductance shunt supporting +/-15 A at 85 C for a fully tuned current-sensing module.
● INA254: Similar integrated-shunt concept with a 400 uOhm element rated for +/-50 A at 85 C, suited to high-current motor and power-stage monitoring.
● INA296B: Bidirectional high-common-mode amplifier recommended by TI for applications that need a higher input range than the INA240 baseline.
● INA290: Unidirectional current-sense amplifier offered by TI for designs that do not require reverse current measurement but want simplified single-direction scaling.
