INA139NA/3K - High-Side Current Shunt Monitor | Texas Instruments
MPN: INA139NA/3K β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.95 | $95.00 |
| 500 | $0.82 | $410.00 |
| 1,000 | $0.74 | $740.00 |
Drop-in alternatives for INA139NA/3K β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
INA169NA/3K
β Drop-Inπ Reference alternative (not in catalog)
INA139NA/250
β Drop-Inπ Reference alternative (not in catalog)
INA139NA/250G4
β Drop-Inπ Reference alternative (not in catalog)
MAX4080TASA+
β Drop-Inπ Reference alternative (not in catalog)
LT1999HMS8-10F
β Drop-Inπ Reference alternative (not in catalog)
MCP6H01T-E/OT
β Drop-Inπ Reference alternative (not in catalog)
INA139NA/3K Maximum Ratings & Electrical Characteristics
| Supply Voltage Range | 2.7 V to 36 V |
| Input Common-Mode Voltage Range | 2.7 V to 60 V |
| Bandwidth | 440 kHz |
| Quiescent Current | 60 Β΅A (typ) |
| Gain Setting | Single external resistor |
| Output Type | Current |
| Accuracy | 0.5% (max) |
| Package | SOT-23-5 (DBV) |
| Operating Temperature Range | -40Β°C to +125Β°C |
| Mounting Type | Surface Mount |
| Number of Pins | 5 |
| RoHS Status | Compliant |
| REACH Status | Compliant |
| AEC-Q100 Qualified | No |
| Lead-Free | Yes |
INA139NA/3K Pin Configuration
| Pin 1 | IN+ β Positive input, connect to shunt resistor high side |
| Pin 2 | IN- β Negative input, connect to shunt resistor low side |
| Pin 3 | GND β Ground |
| Pin 4 | OUT β Current output, connect to gain resistor to ground |
| Pin 5 | VS β Power supply, 2.7V to 36V |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
INA139NA/3K is suitable for 6 applications: Battery Charger Monitoring, Power Supply Load Monitoring, Motor Control Current Sensing, Telecom Line Current Monitoring, Automotive Load Detection, Industrial Process Control.
Battery Charger Monitoring
The INA139NA/3K is ideal for monitoring charge and discharge currents in battery chargers. Its high-side sensing capability allows accurate measurement without disturbing the ground path. With a bandwidth of 440kHz, it can capture fast current transients during charging cycles. The low quiescent current of 60Β΅A minimizes power loss, making it suitable for portable chargers. The output current can be directly fed to an ADC for precise state-of-charge estimation, ensuring efficient battery management.
Recommended
Power Supply Load Monitoring
In power supply designs, the INA139NA/3K provides real-time load current monitoring. Its wide common-mode range of up to 60V allows sensing on high-voltage rails. The single-resistor gain set simplifies scaling to match ADC input ranges. The 440kHz bandwidth enables detection of load transients, which is critical for stability analysis. The small SOT-23-5 package fits compact power modules, and the low quiescent current ensures minimal impact on efficiency.
Recommended
Motor Control Current Sensing
The INA139NA/3K is well-suited for motor control applications where monitoring phase currents is essential. Its high bandwidth of 440kHz allows accurate capture of PWM-driven current waveforms. The high-side sensing eliminates ground noise, improving measurement accuracy. The device's wide common-mode range accommodates motor supply voltages up to 60V. The low quiescent current is beneficial in battery-operated motor drives, and the small package integrates easily into motor controller boards.
Recommended
Telecom Line Current Monitoring
In telecom equipment, the INA139NA/3K monitors line currents in power distribution. Its ability to sense high-side currents up to 60V common-mode makes it suitable for -48V telecom rails. The device's low quiescent current reduces power overhead in always-on systems. The 440kHz bandwidth supports fast fault detection, enabling protective actions. The SOT-23-5 package is ideal for high-density line cards, and the single-resistor gain set simplifies calibration.
Recommended
Automotive Load Detection
The INA139NA/3K is used in automotive systems for detecting loads such as lighting and motors. Its wide common-mode range handles automotive battery voltages (12V/24V systems). The high bandwidth allows monitoring of inrush currents. The device operates over -40Β°C to +125Β°C, suitable for under-hood environments. The small package and low quiescent current are advantageous for space-constrained automotive modules. However, it is not AEC-Q100 qualified, so for automotive-grade requirements, consider the INA169-Q1 variant.
Recommended
Industrial Process Control
In industrial automation, the INA139NA/3K monitors currents in actuators and sensors. Its high-side sensing capability simplifies wiring in distributed systems. The wide common-mode range accommodates 24V industrial supplies. The 440kHz bandwidth enables fast response to load changes, improving control loop performance. The device's low quiescent current is beneficial in field instruments powered by loops. The SOT-23-5 package fits compact industrial PCBs, and the single-resistor gain set allows easy scaling.
Recommended
Recommended Products Summary
Engineering reference data for INA139NA/3K β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA169NA/3K | MAX4080TASA+ | LT1999HMS8-10F |
|---|---|---|---|---|
| Package | SOT-23-5 (DBV) | SOT-23-5 (DBV) | SOT-23-5 | SOT-23-5 |
| Brand | Texas Instruments | Texas Instruments | Maxim Integrated | Analog Devices |
| Supply Voltage Range | 2.7V to 36V | 2.7V to 36V | 4.5V to 76V | 2.7V to 5.5V |
| Common-Mode Voltage Range | 2.7V to 60V | 2.7V to 60V | 4.5V to 76V | 2.7V to 5.5V |
| Bandwidth | 440kHz | 440kHz | 250kHz | 120kHz |
| Quiescent Current | 60Β΅A | 60Β΅A | 100Β΅A | 1.1mA |
| Gain Setting | Single resistor | Single resistor | Fixed gain options | Fixed gain options |
| Output Type | Current | Current | Voltage | Voltage |
Key Differentiators
- Wide common-mode voltage range up to 60V (vs LT1999HMS8-10F)
- Low quiescent current of 60Β΅A (vs MAX4080TASA+)
- High bandwidth of 440kHz (vs MAX4080TASA+)
Design Notes
Place the shunt resistor close to the INA139NA/3K inputs to minimize parasitic inductance and resistance. Use Kelvin connections to the shunt to ensure accurate voltage sensing. Keep the gain resistor close to the OUT pin and route the output trace away from noisy power traces to avoid interference.
Ensure the shunt resistor value is chosen to keep the voltage drop within the device's common-mode range. The maximum differential input voltage is limited; exceeding it can cause inaccurate readings. Also, the output current must be converted to a voltage with a resistor to ground; do not leave the output unloaded.
The INA139NA/3K dissipates minimal power due to its low quiescent current, but in high-temperature environments, ensure the junction temperature stays within -40Β°C to +125Β°C. The SOT-23-5 package has a thermal resistance of approximately 250Β°C/W; for high ambient temperatures, consider derating or using a larger copper area.
Compliance Information
RoHS and REACH compliant per TI product page. Not AEC-Q100 qualified; for automotive, use INA169-Q1.
