Overview
The INA138NA/3KG4 is a high-side, unipolar current shunt monitor produced by Texas Instruments. This device is part of the INA1x8 family, which includes the INA138 and INA168. It is designed for precision current sensing applications and features a wide input common-mode voltage range, low quiescent current, and high accuracy. The INA138NA/3KG4 is ideal for measuring small differential voltages across a shunt resistor in the presence of large common-mode voltages, making it suitable for various industrial and automotive applications.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Common-mode Voltage Range | VIN+ = 2.7 V to 36 V | - | - | - | V |
| Offset Voltage | TA = 25°C | ±0.2 | ±1 | ±2 | mV |
| Offset Voltage Drift | TA = –40°C to +125°C | - | - | 1 | µV/°C |
| Input Bias Current | TA = 25°C | - | 2 | 10 | µA |
| Transconductance | VSENSE = 10 mV to 150 mV, TA = 25°C | 198 | 200 | 202 | µA/V |
| Nonlinearity Error | VSENSE = 10 mV to 150 mV | - | ±0.01% | ±0.1% | % |
| Total Output Error | VSENSE = 100 mV, TA = 25°C | - | ±0.5% | ±2% | % |
| Output Impedance | - | - | - | 1 || 5 GΩ|| pF | - |
| Bandwidth | ROUT = 5 kΩ | - | - | 800 kHz | kHz |
| Operating Temperature Range | - | -40 | - | 125 | °C |
| Package | - | - | - | SOT-23 (5) | - |
Key Features
- High-side, unipolar current shunt monitor
- Wide input common-mode voltage range (2.7 V to 36 V for INA138)
- Low quiescent current
- High accuracy and precision
- Single power supply operation
- Input voltages can exceed the power supply voltage
- Low noise output transistor
- Precision thin film resistors trimmed in production
Applications
The INA138NA/3KG4 is suitable for a variety of applications, including:
- Industrial current sensing and monitoring
- Automotive systems for battery management and motor control
- Power supply monitoring and control
- Medical devices requiring precise current measurement
- Consumer electronics for power management
Q & A
- What is the INA138NA/3KG4 used for?
The INA138NA/3KG4 is used for precision current sensing applications, particularly in measuring small differential voltages across a shunt resistor in the presence of large common-mode voltages. - What is the input common-mode voltage range of the INA138NA/3KG4?
The input common-mode voltage range is from 2.7 V to 36 V. - What is the typical transconductance of the INA138NA/3KG4?
The typical transconductance is 200 µA/V. - What is the operating temperature range of the INA138NA/3KG4?
The operating temperature range is from –40°C to 125°C. - What package type is the INA138NA/3KG4 available in?
The INA138NA/3KG4 is available in the SOT-23 (5) package. - What are some common applications of the INA138NA/3KG4?
Common applications include industrial current sensing, automotive systems, power supply monitoring, medical devices, and consumer electronics. - How does the INA138NA/3KG4 handle high common-mode voltages?
The INA138NA/3KG4 is designed to handle high common-mode voltages, allowing it to measure small differential voltages accurately in such conditions. - What is the nonlinearity error of the INA138NA/3KG4?
The nonlinearity error is typically ±0.01% to ±0.1%. - What is the bandwidth of the INA138NA/3KG4 when using a 5 kΩ load resistor?
The bandwidth is approximately 800 kHz. - Can the INA138NA/3KG4 be powered from a single power supply?
Yes, the INA138NA/3KG4 can be powered from a single power supply.
