TI INA2181A1IDGSR 26V Dual Channel Bi-Directional 350kHz Current Sense Amplifier

 

Shenzhen Mingjiada Electronics Co., Ltd., as a professional electronic component supplier, offers TI's genuine INA2181A1IDGSR current sensing amplifier in stock. This product stands out with its exceptional 26V wide common-mode voltage range, dual-channel bidirectional sensing capability, and 350kHz high bandwidth, making it an ideal choice for industrial control, power management, and new energy applications.

 

【Product Overview and Core Features of the INA2181A1IDGSR】

The INA2181A1IDGSR is a high-performance dual-channel bidirectional current sensing amplifier housed in a 10-pin VSSOP package, specifically designed for applications requiring precise current monitoring. It features several outstanding technical characteristics.

 

The wide common-mode voltage range is a key highlight of the INA2181A1IDGSR, with an operating range extending from -0.2V to +26V. This feature enables flexible application in both high-side and low-side current detection configurations, operating completely independently of the power supply voltage. This broad voltage adaptability is particularly suited for current monitoring requirements in industrial motor control and high-power power systems.

 

In terms of accuracy performance, the INA2181A1IDGSR excels:

Gain error as low as ±1%

Input offset voltage as low as 100μV

Temperature drift coefficient as low as 1μV/°C (maximum)

Common-mode rejection ratio (CMRR) as high as 84dB

 

These precision features ensure stable and reliable current measurement results under various environmental conditions.

 

The INA2181A1IDGSR features a fixed gain design (20 V/V) with an internally integrated matched resistor gain network. This design not only simplifies the system design process but also minimises gain error and reduces the impact of temperature drift. Compared to solutions requiring external gain adjustment, this integrated design enhances system consistency and reliability.

 

The dual-channel architecture is another key feature of the INA2181A1IDGSR, enabling simultaneous monitoring of two independent current paths. This functionality is particularly valuable in applications requiring multi-channel current monitoring, such as redundant power systems or multi-phase motor control. Each channel offers a bandwidth of up to 350kHz and a slew rate of 2V/μs, enabling rapid response to current changes and meeting real-time monitoring requirements under dynamic load conditions.

 

In terms of power efficiency, the INA2181A1IDGSR performs exceptionally well:

Operating voltage range: 2.7V to 5.5V single supply

Maximum supply current: only 500μA (dual-channel)

Low-power design suitable for battery-powered applications

 

These features make it an ideal choice for portable devices and energy-sensitive systems.

 

 

【INA2181A1IDGSR Specifications】

Product category: Current detection amplifier

Number of channels: 2 channels

GBP - Gain-bandwidth product: 350 kHz

Vcm - Common-mode voltage: 12 V

CMRR - Common-mode rejection ratio: 100 dB

Ib - Input bias current: 75 uA

Vos - Input bias voltage: 100 uV

Supply Voltage - Maximum:    5.5 V

Supply Voltage - Minimum:    2.7 V

Operating Supply Current:    500 uA

Gain Error:    0.1 %

Minimum Operating Temperature:    -40 °C

Maximum Operating Temperature:    +125 °C

en - Input Voltage Noise Density:    40 nV/√Hz

Features:    Bidirectional, dual-channel, low-side compatible

Gain V/V:    20 V/V

Input type:    Common-mode

Ios - Input bias current:    50 nA

 

【INA2181A1IDGSR Application Areas】

The INA2181A1IDGSR current sense amplifier demonstrates broad application potential across multiple industrial and consumer electronics sectors due to its outstanding performance parameters.

 

Motor control systems are one of the primary application areas for the INA2181A1IDGSR. In modern industrial drives and automation equipment, precise motor current monitoring is critical for achieving efficient control and overcurrent protection. The INA2181A1IDGSR's dual-channel configuration is particularly suited for monitoring two-phase currents in three-phase motors, and its 350 kHz bandwidth accurately captures current waveforms under PWM drive, providing real-time feedback for vector control algorithms. Additionally, its 26V common-mode voltage range enables direct current monitoring on the motor drive bridge arms, simplifying circuit design.

 

In power management systems, the INA2181A1IDGSR plays a critical role:

Current monitoring in power distribution units (PDUs) for servers and telecommunications equipment

Inductance current detection in DC-DC converters

Phase current balancing in multi-phase VRMs (voltage regulation modules)

Overcurrent and short-circuit protection circuits

 

Its bidirectional current detection capability is particularly suitable for battery charging and discharging systems, enabling precise monitoring of charging and discharging currents on a single chip, simplifying BMS (Battery Management System) design.

 

The new energy sector is another important application area for the INA2181A1IDGSR:  

DC-side current detection in photovoltaic inverters  

MPPT algorithm support in solar charge controllers  

Generator current monitoring in wind power systems  

Battery pack current management in energy storage systems  

 

In these applications, the device's high precision and wide temperature range (-40°C to +125°C) ensure reliable operation in harsh environments.

 

The INA2181A1IDGSR is also widely adopted in industrial automation equipment:

Analogue input modules for PLCs (Programmable Logic Controllers)

Torque current feedback for robot joint drives

Energy consumption monitoring systems for Industry 4.0 devices

Signal conditioning circuits for process control instruments

 

In these applications, the device's interference resistance and stability are particularly important, with its high CMRR and optimised layout design effectively suppressing noise interference in industrial environments.

 

For the consumer electronics sector, the INA2181A1IDGSR is particularly suitable for:

Current monitoring in power adapters for high-end laptops

Energy consumption analysis in smart home devices

Power measurement functionality in USB PD chargers

Remaining battery level estimation in drone battery systems

 

In these applications, the device's compact VSSOP package and low-power characteristics provide significant advantages.