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INA240A4PWR
TSSOP-8 (3x3mm)
The INA240A4PWR from TI is a high-precision 80V current-sense amplifier with 200V/V gain and enhanced PWM rejection for motor drive current sensing in TSSOP-8.
| Package | TSSOP-8 (3x3mm) |
The INA240A4PWR from TI is a high-precision 80V current-sense amplifier with 200V/V gain and enhanced PWM rejection for motor drive current sensing in TSSOP-8.
The INA240A4PWR is a high-precision, high-side current sense amplifier from Texas Instruments in TSSOP-8, with a fixed gain of 200V/V (A4 version). It measures the voltage across a shunt resistor placed between the power supply and the load (high-side sensing), with a common-mode voltage range of -4V to +80V, making it suitable for 48V automotive and industrial systems. The key innovation is the enhanced PWM rejection: the device maintains accuracy during rapid common-mode voltage transitions (up to 2V/us), which occur in motor drive applications where the high-side switch chops the supply at 10-100kHz PWM. The offset voltage is 5uV typical (25uV max over temperature), and the gain error is 0.2% typical. With a 200V/V gain and a 10m-ohm shunt, a 1A current produces 200uV across the shunt, amplified to 40mV at the output. The bidirectional capability means the INA240 can measure both charging and discharging currents in battery systems. The REF1 and REF2 pins set the output reference voltage: for unidirectional measurement, connect both to GND for 0V baseline; for bidirectional, connect to VS/2 for mid-supply baseline. The bandwidth is 400kHz, sufficient for current control loops in motor drives. The quiescent current is 300uA. The A4 gain version (200V/V) is optimized for small shunt resistors in high-current applications. The -PWR suffix specifies TSSOP-8 tape-and-reel.
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | IN- | Input | Negative shunt voltage input (connects to load side of shunt resistor) |
| 2 | GND | Power | Ground |
| 3 | REF1 | Input | Reference input 1 (sets output baseline, connect to GND or midpoint) |
| 4 | REF2 | Input | Reference input 2 (sets output baseline with REF1) |
| 5 | OUT | Output | Amplified output voltage (VOUT = (VSHUNT x GAIN) + VREF) |
| 6 | VS | Power | Supply (2.7-5.5V) |
| 7 | IN+ | Input | Positive shunt voltage input (connects to supply side of shunt resistor) |
| 8 | NC | – | No connect |
| Manufacturer | Part Number | Package | Notes |
|---|---|---|---|
| Texas Instruments | INA240A1PWR | TSSOP-8 | Same device, 20V/V gain |
| Texas Instruments | INA240A2PWR | TSSOP-8 | Same device, 50V/V gain |
| Texas Instruments | INA240A3PWR | TSSOP-8 | Same device, 100V/V gain |
| Texas Instruments | INA281AIDDFR | SOT-23-5 | 80V, 200V/V, smaller package |
| Analog Devices | AD8418AWHRZ | SOIC-8 | 80V, 60V/V, PWM rejection, similar |
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
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