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See Technical Specifications

INA281A1IDBVR

Current Sense Amplifier 1 Circuit SOT-23-5

Manufacturer:

Texas Instruments
Mfr.Part #:

INA281A1IDBVR
Datasheet:

INA281A1IDBVR Datasheet (PDF)
Series:

INA281
Number of Channels:

1 Channel
GBP - Gain Bandwidth Product:

1.3 MHz
Vcm - Common Mode Voltage:

48 V
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INA281A1IDBVR General Description

The INA281 is a high-precision current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –4 V to 110 V. The negative common-mode voltage allows the device to operate below ground, thus accommodating precise measurement of recirculating currents in half-bridge applications. The combination of a low offset voltage, small gain error and high DC CMRR enables highly accurate current measurement. The INA281 is not only designed for DC current measurement, but also for high-speed applications (like fast overcurrent protection, for example) with a high bandwidth of 1.3 MHz and an 65-dB AC CMRR (at 50 kHz).

The INA281 operates from a single 2.7-V to 20-V supply, drawing 1.5 mA of supply current. The INA281 is available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain options address wide dynamic range for current-sensing applications.

The INA281 is specified over an operating temperature range of −40 °C to +125 °C and is offered in a space-saving SOT-23 package with two pin-out variants.

Key Features

Wide common-mode voltage:
- Operational voltage: −4 V to +110 V
- Survival voltage: −20 V to +120 V
Excellent CMRR:
- 120-dB DC CMRR
- 65-dB AC CMRR at 50 kHz
Accuracy:
- Gain:
  - Gain error: ±0.5% (maximum)
  - Gain drift: ±20 ppm/°C (maximum)
- Offset:
  - Offset voltage: ±55 µV (typical)
  - Offset drift: ±0.1 µV/°C (typical)
Available gains:
- INA281A1, INA281B1 : 20 V/V
- INA281A2, INA281B2 : 50 V/V
- INA281A3, INA281B3 : 100 V/V
- INA281A4, INA281B4 : 200 V/V
- INA281A5, INA281B5 : 500 V/V
High bandwidth: 1.3 MHz
Slew rate: 2.5V/µs
Quiescent current: 1.5 mA

Specifications

Product Category	Current Sense Amplifiers	Series	INA281
Number of Channels	1 Channel	GBP - Gain Bandwidth Product	1.3 MHz
Vcm - Common Mode Voltage	48 V	CMRR - Common Mode Rejection Ratio	120 dB
Ib - Input Bias Current	20 uA	Vos - Input Offset Voltage	100 uV
Supply Voltage - Max	20 V	Supply Voltage - Min	2.7 V
Operating Supply Current	1.5 mA	Gain Error	0.5 %
Minimum Operating Temperature	- 40 C	Maximum Operating Temperature	+ 125 C
Mounting Style	SMD/SMT	en - Input Voltage Noise Density	50 nV/sqrt Hz
Gain V/V	20 V/V	Product	Current Sense Amplifiers
Product Type	Current Sense Amplifiers	Settling Time	1 us
Shutdown	No Shutdown	SR - Slew Rate	2.5 V/us
Factory Pack Quantity	3000	Subcategory	Amplifier ICs
Topology	Precision Zero-Drift