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26V, 350kHz current sense amplifier w/ integrated over-current comparator

Availability: 6,794


Package | PIN: WSON (DSG) | 8
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $0.61
10-24 $0.54
25-99 $0.50
100-249 $0.43
250-499 $0.40
500-749 $0.32
750-999 $0.26
1,000+ $0.23


  • Common-mode input range: –0.2 V to +26 V
  • High accuracy amplifier:
    • Offset voltage at TA = 25°C
      • 500 µV (maximum) at VCM = 12 V
      • 150 µV (maximum) at VCM = 0 V
    • Offset voltage drift: 1 µV/°C (maximum)
    • Gain error: 1% (maximum) at 25°C
    • Gain error drift: 20 ppm/°C (maximum)
  • Available amplifier gains:
    • INA381A1: 20 V/V
    • INA381A2: 50 V/V
    • INA381A3: 100 V/V
    • INA381A4: 200 V/V
  • Open-drain comparator:
    • Hysteresis: 50 mV
    • Propagation delay: 400 ns(typ)
    • Alert threshold set through external referencevoltage
    • Supports transparent and latching modes
  • Packages: VSSOP-10 and WSON-8

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Texas Instruments  INA381A4IDSGR

The INA381 includes both a 26-V common-mode, current-sensing amplifier and a high-speedcomparator. This device detects overcurrent conditions by measuring the voltage developed across acurrent-shunt resistor and comparing that voltage to a user-defined threshold limit set by thecomparator reference pin. The current-shunt monitor can measure differential voltage signals oncommon-mode voltages that vary from –0.2 V up to 26 V, independent of the supply voltage.

The open-drain alert output can be configured to operate in two modes: transparent orlatched. In transparent mode, the output status follows the input state. In latched mode, the alertoutput is cleared only when the latch is reset. The standalone comparator large-signal alertresponse time is less than 2 µs, allowing for quick detection of overcurrent events. The totalsystem overcurrent protection response time provided by the INA381 is less than 10 µs.

This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supplycurrent of 350 µA. The device is specified over an operating temperature range of –40°C to +125°C,and is available in 8-pin WSON and 10-pin VSSOP packages.