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Texas Instruments INA139NA/250G4
- Part No.:
- INA139NA/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA139NA/250G4.pdf
- Description:
- IC CURRENT MONITOR 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,184
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Product details
Overview
INA139NA/250G4 from Texas Instruments is a high-side unipolar current shunt monitor IC in 5-pin SOT-23 package, featuring 2.7 V to 40 V supply range, 2.7 V to 40 V input common-mode voltage range, 1000 µA/V transconductance, ±1.5 mV offset voltage (max), and –40°C to +125°C operating temperature - used for precision high-side current sensing in battery-powered power management systems.
For engineers reviewing the INA139NA/250G4 datasheet, INA139NA/250G4 pinout, INA139NA/250G4 application, or INA139NA/250G4 equivalent, key selection considerations include its single-supply operation with input common-mode voltage exceeding V+, current-output architecture enabling gain flexibility via external RL, and suitability for automotive, portable, and industrial current monitoring where thermal stability and low quiescent current (60 µA typ) are critical.
Technical Context
The INA139NA/250G4 integrates a high-voltage precision op amp, laser-trimmed thin-film resistors, and a low-noise output transistor to deliver accurate current-to-current conversion. Its input stage operates with common-mode voltages up to 40 V independent of V+ (2.7–40 V), enabling direct placement on high-side shunts in 12 V/24 V/36 V systems.
It functions as a transconductance amplifier: differential input voltage (VIN+ − VIN−) across a shunt resistor is converted to a proportional output current (IO = gm × VSENSE), which is then converted to voltage by an external load resistor RL. Gain is set solely by RL, with no internal feedback components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 40 V - supports direct connection to wide-range DC bus without level-shifting or auxiliary supply. |
| Input Common-Mode Range | 2.7 V to 40 V - enables high-side sensing on loads referenced above ground, even when V+ is lower than VIN+. |
| Transconductance (gm) | 1000 µA/V (±1% typ) - defines linear current output per mV of shunt voltage; sets system gain with RL. |
| Offset Voltage (RTI) | ±1.5 mV (max) - contributes ≤0.3% error at 500 mV full-scale sense voltage; critical for low-current accuracy. |
| Quiescent Current | 60 µA (typ), 125 µA (max) - enables always-on monitoring in battery-backed systems with minimal drain. |
| Bandwidth | 440 kHz (RL = 10 kΩ) - supports fast transient current detection in motor control or fault protection. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments without derating. |
Pinout & Package
INA139NA/250G4 is housed in a 5-pin SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, with exposed pad not electrically connected. Pin 1 is OUT (output current sink), Pin 2 is GND (ground reference), Pin 3 is VIN+ (positive shunt terminal), Pin 4 is VIN− (negative shunt terminal), and Pin 5 is V+ (power supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Current output terminal | Sinks precise current (IO = gm × VSENSE); requires external RL to ground to generate voltage output. |
| 2 - GND | Analog ground reference | Reference node for internal circuitry; must be connected to system ground with low impedance. |
| 3 - VIN+ | Positive differential input | Connects to high-side of shunt; must be more positive than VIN− for valid unipolar operation. |
| 4 - VIN− | Negative differential input | Connects to low-side of shunt; differential voltage (VIN+ − VIN−) is sensed and converted to current. |
| 5 - V+ | Power supply input | Supplies internal circuitry; independent of VIN+; can be lower than common-mode voltage (e.g., 5 V while VIN+ = 36 V). |
Key Features
| Feature | Design Value |
|---|---|
| Unipolar high-side current measurement | Enables direct sensing on positive rail without ground-referenced shunt, eliminating ground loop errors in isolated systems. |
| Single-resistor gain setting | External RL determines full-scale output voltage (e.g., RL = 10 kΩ → 5 V out for 500 mV sense), simplifying calibration and trimming. |
| Independent supply and common-mode rails | V+ can be 5 V while VIN+ reaches 40 V, allowing use with low-voltage logic supplies in high-voltage power stages. |
| Low quiescent current | 60 µA typical draw permits continuous monitoring in energy-sensitive applications like battery fuel gauging or IoT edge nodes. |
| High common-mode rejection | 99 dB min (DC to 10 kHz) suppresses noise from switching regulators or noisy DC buses during shunt voltage measurement. |
Applications
| Automotive Battery Monitoring | Industrial Power Supply OCP |
|---|---|
|
Use Scenario: Real-time monitoring of starter battery discharge/charge current in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: High-side current shunt monitor converting shunt voltage to proportional output current for ADC digitization. Use Value: Enables accurate state-of-charge estimation and overcurrent protection with ±1.5 mV offset limiting error to <0.3% at 500 mV full scale, across –40°C to +125°C. |
Use Scenario: Detecting overcurrent faults in programmable DC power supplies before MOSFET failure. IC Role / Device Role / Timing Role: Fast-response current sensor feeding comparator or microcontroller interrupt pin via buffered output. Use Value: 440 kHz bandwidth ensures sub-µs response to short-circuit events; 60 µA quiescent current avoids loading control loop supply. |
| Portable Device Charger Management | Telecom Line Card Current Sensing |
|
Use Scenario: Measuring charge/discharge current in USB-C PD adapters and wireless charging base stations. IC Role / Device Role / Timing Role: Unipolar current monitor placed between input source and buck converter input capacitor. Use Value: 2.7 V minimum V+ allows operation from LDO outputs; 40 V common-mode range accommodates 24 V input rails with margin. |
Use Scenario: Monitoring per-port current draw on telecom line cards with multiple POTS or VoIP interfaces. IC Role / Device Role / Timing Role: High-side current sensor on each port's power feed, sharing single V+ rail across multiple INA139NA/250G4 units. Use Value: Independent V+/VIN+ rails allow centralized 3.3 V supply while sensing up to 40 V port voltages; SOT-23 footprint saves board space in dense card layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current shunt monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA169NA/3K | Wider common-mode range (2.7 V to 60 V), lower max operating temperature (+85°C vs +125°C), ±1 mV offset (max). | Better suited for 48 V telecom or industrial systems; less suitable for under-hood automotive due to reduced temp rating. | Select INA169NA/3K only if >40 V common-mode is required and ambient temperature stays ≤85°C. |
| MAX4080TASA+ | Higher bandwidth (2.5 MHz), integrated voltage output (no RL needed), but narrower common-mode (–0.1 V to 76 V) and higher quiescent current (120 µA). | Preferred for high-speed feedback loops; requires different PCB layout due to voltage-output architecture and dual supply option. | Choose MAX4080TASA+ when system demands faster response and simplified signal chain, accepting higher power and layout changes. |
Compared with INA139NA/250G4, INA169NA/3K extends voltage capability at the cost of thermal robustness, while MAX4080TASA+ trades current-output simplicity for speed and integrated voltage output - making INA139NA/250G4 optimal for cost-sensitive, thermally demanding, high-side monitoring where 40 V headroom and 125°C operation are decisive.
Availability
INA139NA/250G4 is available at Aetrix Electronics and suitable for automotive battery monitoring, industrial power supply overcurrent protection, and portable device charger management requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for INA139NA/250G4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions, with leadership in precision analog, power management, and signal chain technologies.
INA139NA/250G4 belongs to TI's high-side current sense amplifier product line, designed specifically for accurate, low-power, high-common-mode-voltage unipolar current measurement in automotive, industrial, and computing power systems.
FAQ
What is the maximum input common-mode voltage supported by the INA139NA/250G4?
The INA139NA/250G4 supports an input common-mode voltage range of 2.7 V to 40 V. This means VIN+ and VIN− can both sit anywhere within that range - for example, VIN+ = 36 V and VIN− = 35.5 V - while maintaining specified accuracy. Exceeding 40 V may cause permanent damage or undefined behavior, as stated in the Absolute Maximum Ratings table.
Can the INA139NA/250G4 measure bidirectional current?
No, the INA139NA/250G4 is a unipolar high-side current shunt monitor and only provides valid output when VIN+ is more positive than VIN−. For bidirectional measurement, two INA139NA/250G4 devices must be used in opposing configurations with diode isolation and polarity detection - as shown in Figure 15 of the SBOS181F datasheet - because the device output current drops to zero if the differential input reverses polarity.
How is gain set for the INA139NA/250G4, and what is the role of the external load resistor RL?
Gain is set exclusively by the external load resistor RL connected between the OUT pin and ground. Since the INA139NA/250G4 is a transconductance amplifier (gm = 1000 µA/V), output voltage is VO = IO × RL = (1000 µA/V × VSENSE) × RL. For example, with VSENSE = 100 mV and RL = 10 kΩ, VO = 1 V - giving a system gain of 10 V/V. RL values from 1 kΩ to 100 kΩ are supported with high accuracy.
Does the INA139NA/250G4 require a dual power supply?
No, the INA139NA/250G4 operates from a single supply (V+ = 2.7 V to 40 V) and does not require negative or split supplies. Its input stage is designed to function with VIN+ and VIN− voltages far exceeding V+, enabling true high-side sensing without auxiliary supplies - a key advantage over conventional op-amp-based current sense circuits.
What is the purpose of the GND pin (Pin 2) on the INA139NA/250G4, and how should it be connected?
The GND pin (Pin 2) serves as the internal analog reference for the INA139NA/250G4's amplifier and output transistor. It must be connected directly to the system's clean analog ground plane with low-inductance routing - not to noisy digital ground or power return paths. Improper grounding introduces offset errors and degrades common-mode rejection, especially at high frequencies or in mixed-signal PCB layouts.
INA139NA/250G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±0.5%
- Voltage - Input:
- 2.7V ~ 40V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
INA139NA/250G4 FAQ
1.How can I place an order for INA139NA/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA139NA/250G4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA139NA/250G4 reliable?
The price and inventory of INA139NA/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA139NA/250G4 is usually 5 days.
3.What payment methods are accepted for INA139NA/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA139NA/250G4 transactions.
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4.How is shipping managed for INA139NA/250G4?
INA139NA/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA139NA/250G4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA139NA/250G4?
For technical support, including INA139NA/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA139NA/250G4 requirements.
6.How does Aetrix verify that INA139NA/250G4 is sourced from the original manufacturer or authorized distributors?
All INA139NA/250G4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA139NA/250G4 meets industry standards.
7.What is the process for return or replacement of INA139NA/250G4?
All INA139NA/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA139NA/250G4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA139NA/250G4 part is unused and in its original packaging.
Return procedure for INA139NA/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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