Overview
The INA138NA/250, produced by Texas Instruments, is a high-side, unipolar current shunt monitor. This device is part of the INA1x8 family, which includes the INA138 and INA168. It is designed to measure small differential voltages across a shunt resistor in the presence of large common-mode voltages. The INA138NA/250 is ideal for applications requiring precise current measurement with low quiescent current and a wide input common-mode voltage range.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOT-23 (DBV) | - |
| Pins | 5 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Supply Voltage Range | 2.7 to 36 | V |
| Common-Mode Voltage Range | 2.7 to 36 | V |
| Quiescent Current | 25 | µA |
| Offset Voltage | ±0.2 to ±1 | mV |
| Transconductance | 198 to 202 | µA/V |
| Bandwidth (ROUT = 5 kΩ) | 800 kHz | - |
| Output Impedance | 1 || 5 GΩ|| pF | - |
Key Features
- Complete Unipolar High-Side Current Measurement Circuit: The INA138NA/250 provides a complete solution for high-side current measurement.
- Wide Supply and Common-Mode Range: The device can operate with supply and common-mode voltages ranging from 2.7 V to 36 V.
- Independent Supply and Input Common-Mode Voltages: Allows for flexible application in various voltage environments.
- Single Resistor Gain Set: The gain can be set using a single external resistor, allowing for easy configuration of the measurement circuit.
- Low Quiescent Current: Typical quiescent current of 25 µA, which is beneficial for power-sensitive applications.
- Wide Temperature Range: Operates over a temperature range of –40°C to 125°C, making it suitable for harsh environments.
- Compact SOT-23 Package: The device is packaged in a small SOT-23-5 package, ideal for space-constrained designs).
Applications
The INA138NA/250 is suitable for a variety of applications, including:
- Current Shunt Measurement: Ideal for measuring current in high-side configurations, such as in power supplies, motor control systems, and battery management systems).
- Industrial Automation: Used in industrial automation for monitoring and controlling current in various industrial processes).
- Automotive Systems: Suitable for automotive applications where high-side current measurement is required, such as in battery management and power distribution systems).
- Medical Devices: Can be used in medical devices that require precise current measurement, such as in patient monitoring equipment and medical imaging devices).
Q & A
- What is the primary function of the INA138NA/250?
The primary function of the INA138NA/250 is to measure small differential voltages across a shunt resistor in high-side current measurement applications).
- What is the operating temperature range of the INA138NA/250?
The operating temperature range of the INA138NA/250 is –40°C to 125°C).
- What is the typical quiescent current of the INA138NA/250?
The typical quiescent current of the INA138NA/250 is 25 µA).
- What is the supply voltage range for the INA138NA/250?
The supply voltage range for the INA138NA/250 is 2.7 V to 36 V).
- How is the gain set in the INA138NA/250?
The gain in the INA138NA/250 is set using a single external resistor).
- What package type is the INA138NA/250 available in?
The INA138NA/250 is available in a 5-pin SOT-23 package).
- What are some common applications of the INA138NA/250?
Common applications include current shunt measurement, industrial automation, automotive systems, and medical devices).
- What is the bandwidth of the INA138NA/250 when ROUT = 5 kΩ?
The bandwidth of the INA138NA/250 when ROUT = 5 kΩ is 800 kHz).
- How does the INA138NA/250 handle common-mode voltages?
The INA138NA/250 can handle common-mode voltages ranging from 2.7 V to 36 V, independent of the supply voltage).
- What is the output impedance of the INA138NA/250?
The output impedance of the INA138NA/250 is 1 || 5 GΩ|| pF).
