INA240A1QDRQ1 is an automotive-grade high-precision bidirectional current sense amplifier from TI, featuring an integrated enhanced PWM rejection circuit that suppresses common-mode dV/dt transients up to 100V/µs - ideal for accurate current sensing in PWM motor drives and switching power supply environments. It supports an ultra-wide common-mode voltage range of -5V~80V, enabling direct connection to high-side or low-side current sense resistors.

The device measures current by detecting the voltage drop across an external series sense resistor (typically 1mΩ~10mΩ), amplifying it and delivering current information to the MCU or DSP ADC as a differential output. With a gain of 100V/V, INA240A1QDRQ1 supports ±5A bidirectional current sensing (depending on sense resistor), with zero-current output at approximately VREF/2 (mid-level) to support bidirectional current measurement.

AEC-Q100 certified with an operating temperature range of -40°C ~ +125°C, this device is specifically designed for automotive applications. The SOIC-8 package is suitable for standard SMT production and is ideal for current sensing in automotive motor drives, battery management systems, and power management.

Note: For detailed electrical parameters, refer to the official TI INA240 datasheet. Specifications are subject to change without notice. Design engineers should verify all parameters before final design.

INA240A1QDRQ1 uses the SOIC-8 (Small Outline Integrated Circuit, 8-pin) surface-mount package, one of the most common packages for current sense amplifiers in industrial and automotive applications. SOIC-8 has 1.27mm pin pitch, suitable for standard SMT reflow soldering, with solder joint quality easily inspected by visual inspection and AOI optical inspection.

The pin layout is specifically designed for high-side current sensing: VIN+ and VIN- pins connect to the sense resistor, with an optimized Kelvin connection layout to reduce PCB trace resistance impact on measurement accuracy. It is recommended to use Kelvin connections at both ends of the sense resistor, routing the sense lines directly to the device pins.

INA240A1QDRQ1 SOIC-8 functional pin definitions:

• Pin 1 - V+ (Positive Supply): Positive supply input pin, 2.7V~5.5V; a 0.1µF decoupling capacitor near the pin is recommended.
• Pin 2 - VREF (Reference Voltage): Bidirectional output reference voltage pin; typical value is V+/2, used to bias the output to support bidirectional current measurement.
• Pin 3 - V- (Negative Supply/Ground): Ground pin; connect to system ground.
• Pin 4 - OUT (Output): Differential amplifier output pin; Output voltage = VREF ± (Gain × V_SENSE), where V_SENSE = (I_LOAD × R_SENSE).
• Pin 5 - V- (Negative Supply/Ground): Ground pin; internally connected to Pin 3.
• Pin 6 - NC (No Connect): No-connect pin; leave floating.
• Pin 7 - VIN- (Current Sense Negative): Current sense amplifier negative input; connect to the load side of the sense resistor.
• Pin 8 - VIN+ (Current Sense Positive): Current sense amplifier positive input; connect to the supply side of the sense resistor.

The following alternative parts are listed for reference. Before selecting an alternative, verify communication interface, supply voltage, security algorithm compatibility, and software API differences.

Texas Instruments (NASDAQ: TXN), headquartered in Dallas, Texas, USA, is one of the world's largest analog semiconductor companies. TI's current sense amplifier product line covers the full range from general-purpose to automotive-grade, from low voltage to high common-mode voltage. The INA240 series, with its ultra-wide common-mode voltage and enhanced PWM rejection, has become the industry benchmark for automotive motor drive current sensing.

TI has multiple technical support centers and local warehouses in China, enabling fast response to domestic automotive electronics customers for samples and volume production.