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INA139NA/3K
INA139NA/3K – High-Side Current Shunt Monitor
📌 Product Overview
The INA139NA/3K is a high-side, unipolar current shunt monitor from Texas Instruments designed for precision current measurement applications. It converts a differential input voltage into a current output, which can then be converted back to a voltage using an external load resistor for flexible gain configuration.
INA139NA/3K – High-Side Current Shunt Monitor
📌 Product Overview
The INA139NA/3K is a high-side, unipolar current shunt monitor from Texas Instruments designed for precision current measurement applications. It converts a differential input voltage into a current output, which can then be converted back to a voltage using an external load resistor for flexible gain configuration.
⚙️ Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage Range | 2.7V to 40V |
| Common-Mode Voltage Range | 2.7V to 40V |
| Quiescent Current (Typical) | 60 µA |
| Bandwidth | 440 kHz |
| Accuracy | ±0.5% |
| Input Offset Voltage (Vos) | 200 µV |
| Input Bias Current (Ib) | 10 nA |
| CMRR | 115 dB |
| Operating Temperature Range | -40°C to +125°C |
✨ Key Features
- Complete High-Side Current Measurement Circuit – Integrated solution without additional external components
- Wide Supply and Common-Mode Range – Supports 2.7V to 40V operation
- Independent Supply and Input Voltages – Flexible system integration
- Single-Resistor Gain Setting – Gain configurable from 1 to over 100
- Ultra-Low Quiescent Current – Only 60 µA typical consumption
- Compact SOT-23-5 Package – Space-efficient surface-mount design
- Industrial Temperature Range – -40°C to +125°C operation
📦 Packaging Information
| Package Type | SOT-23-5 (DBV) |
| Package Quantity | 3,000 per reel (Tape & Reel) |
| MSL Rating / Peak Reflow | Level-2-260C-1 YEAR |
| Lead Finish / Ball Material | NiPdAu |
🔧 Applications
- Shunt Measurement – Automotive systems, telephones, computers
- Battery Management – Portable and backup battery systems
- Battery Chargers – Li-ion, NiMH, lead-acid charger monitoring
- Power Management – Industrial and consumer electronics
- Mobile Devices – Smartphones, tablets battery monitoring
- Precision Current Sources – Test equipment and measurement devices
⚡ Working Principle
The INA139NA/3K senses the voltage drop across a shunt resistor placed between the power supply and the load. It converts this differential voltage into a proportional output current, which flows through an external load resistor to generate a measurable voltage. Gain is set by selecting the value of this external resistor.
📋 Compliance & Export Classification
| RoHS Status | ROHS3 Compliant |
| REACH Status | Not REACH affected |
| US ECCN | EAR99 |
| HTSUS | 8542.33.0001 |
