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Texas Instruments INA169NA/250G4
- Part No.:
- INA169NA/250G4
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA169NA/250G4.pdf
- Description:
- IC CURRENT MONITOR 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
INA169NA/250G4 from Texas Instruments is a high-side unipolar current shunt monitor IC in 5-pin SOT-23 package, delivering 1000 µA/V transconductance, 60 V max common-mode input voltage, and ±1 mV offset voltage (max) over –40°C to +85°C. It converts differential shunt voltage into a precision output current for battery chargers, power management systems, and automotive load monitoring.
For engineers reviewing the INA169NA/250G4 datasheet, INA169NA/250G4 pinout, INA169NA/250G4 application, or INA169NA/250G4 equivalent, key selection criteria include its independent supply/common-mode voltage operation up to 60 V, single-resistor gain configuration, 440 kHz bandwidth at 10 kΩ load, low 60 µA quiescent current, and SOT-23 thermal performance (θJA = 168.3°C/W).
Technical Context
The INA169NA/250G4 integrates a high-voltage precision op amp with trimmed thin-film resistors and a low-noise output transistor, enabling accurate measurement of small differential voltages across shunts under large common-mode conditions. Its transconductance remains stable at 990–1010 µA/V across temperature and input voltage variations.
Input common-mode and supply voltages operate independently: V+ ranges from 2.7 V to 60 V, while VIN+ accepts up to 60 V regardless of V+, supporting true high-side sensing in 48 V industrial and automotive systems. Output compliance is governed by both V+ and VIN+, limiting maximum VOUT per Equation 1 and Equation 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transconductance | 1000 µA/V - defines exact output current per mV of sensed shunt voltage (e.g., 100 mV → 100 µA), enabling precise gain setting via external RL |
| Common-mode input range | 2.7 V to 60 V - allows direct connection to high-side bus voltages up to 60 V without level shifting or isolation |
| Offset voltage (max) | ±1 mV - contributes ≤0.5% total output error at 200 mV full-scale sense voltage, critical for low-current accuracy |
| Bandwidth | 440 kHz (RL = 10 kΩ) - supports fast transient current detection in switching power supplies and motor control |
| Quiescent current | 60 µA (typ) - enables always-on monitoring in battery-backed systems with minimal standby drain |
| CMRR | 100–120 dB - rejects noise from high-voltage rails, ensuring stable output under EMI-rich environments like automotive ECUs |
| Operating temperature | –40°C to +85°C - qualified for under-hood automotive and industrial ambient conditions without derating |
Pinout & Package
INA169NA/250G4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts and thermal dissipation (θJA = 168.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Current output terminal | Delivers gm × VSENSE current; requires external RL to ground to generate voltage output; high impedance (>1 GΩ) preserves gain accuracy |
| 2 - GND | Ground reference | Return path for internal circuitry; must be connected to system ground plane with low-inductance trace to minimize noise coupling |
| 3 - VIN+ | Positive differential input | Connects to high-side of shunt resistor; accepts up to 60 V common-mode voltage independent of V+ |
| 4 - VIN– | Negative differential input | Connects to low-side of shunt resistor; differential input range limited to 0–500 mV for accuracy; reverse polarity yields zero output |
| 5 - V+ | Power supply input | Supplies internal circuitry; operates from 2.7 V to 60 V; decoupling capacitor required near pin for stability |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain set | Gain determined solely by external RL value (e.g., 10 kΩ → 10 V/V), eliminating trimming components and simplifying BOM |
| Independent supply and common-mode rails | V+ and VIN+ can differ by up to 57.3 V (e.g., V+ = 5 V, VIN+ = 60 V), enabling direct high-side sensing in 48 V systems powered from local 3.3 V/5 V rails |
| Low quiescent current | 60 µA typical allows continuous monitoring in energy-sensitive applications like portable medical devices or IoT node battery management |
| High CMRR | 100–120 dB ensures <0.001% error contribution from 60 V rail noise, critical for precision battery fuel gauging |
| Wide bandwidth scalability | Bandwidth inversely proportional to RL (440 kHz @ 10 kΩ, 220 kHz @ 20 kΩ), permitting trade-off between speed and noise immunity |
Applications
| Automotive Load Monitoring | Battery Charger Current Sensing |
|---|---|
|
Use Scenario: Real-time monitoring of 12 V/24 V battery charging current in vehicle infotainment or ADAS ECUs. 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 <0.5% total error at 100 mV sense voltage, even under engine cranking transients. |
Use Scenario: Precision current regulation in multi-stage Li-ion battery chargers with 4.2 V termination. IC Role / Device Role / Timing Role: Unipolar current sensor placed on high-side of charge FET, feeding feedback loop of CC/CV controller. Use Value: 60 µA quiescent current minimizes self-heating drift during long-duration constant-voltage phase; 440 kHz bandwidth captures fast charge termination events. |
| Industrial Power Supply PMBus Monitoring | Portable Equipment Battery Management |
|
Use Scenario: Reporting output current telemetry via PMBus/I²C in programmable DC supplies. IC Role / Device Role / Timing Role: High-side analog front-end converting shunt voltage to buffered voltage for isolated ADC interface. Use Value: 2.7–60 V common-mode range accommodates 48 V telecom rectifiers; ±1 mV offset ensures <1% error at 1 A (100 mΩ shunt). |
Use Scenario: Low-power current tracking in handheld medical devices with coin-cell backup. IC Role / Device Role / Timing Role: Always-on shunt monitor feeding ultra-low-power microcontroller ADC during sleep mode. Use Value: 60 µA supply current extends battery life beyond 1 year in 10 µA average system sleep current; SOT-23 footprint saves board area. |
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 |
|---|---|---|---|
| INA219BIDR | Digital I²C output, integrated 12-bit ADC and multiplier; 26 V max common-mode; 1 µA shutdown current | Replaces analog signal chain with digital telemetry; eliminates external ADC and gain resistor but lacks >26 V capability | Select when digital interface, auto-ranging, or lower system-level power is prioritized over 60 V operation |
| MAX4080TASA+ | Fixed-gain variants (20 V/V, 60 V/V); 76 V max common-mode; 100 µA quiescent current; SO-8 package | Requires no external RL; higher voltage rating suits 60 V EV auxiliary systems; larger footprint and higher IQ limit battery use | Select when fixed gain simplifies layout and 76 V headroom is needed, accepting SO-8 size and higher standby draw |
Compared with INA169NA/250G4, INA219BIDR offers integrated digital conversion but sacrifices 60 V common-mode capability, while MAX4080TASA+ delivers higher voltage tolerance and fixed gain at the cost of flexibility and quiescent current efficiency.
Availability
INA169NA/250G4 is available at Aetrix Electronics and suitable for automotive load monitoring, battery charger current sensing, and industrial power supply PMBus monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for INA169NA/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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.
The INA1x9 product line was designed specifically for high-side unipolar current measurement in harsh voltage environments, targeting automotive, industrial, and telecom power systems where common-mode rejection and rail-to-rail operation are critical.
FAQ
What is the maximum common-mode voltage supported by the INA169NA/250G4?
The INA169NA/250G4 supports a maximum common-mode input voltage of 60 V, as specified in the Recommended Operating Conditions table. This allows direct connection to high-side shunts in 48 V systems without attenuation or level-shifting circuitry. The absolute maximum rating extends to 75 V, but operation above 60 V risks exceeding guaranteed performance limits.
Can the INA169NA/250G4 measure bidirectional current?
The INA169NA/250G4 is a unipolar device and cannot directly measure bidirectional current. As stated in the datasheet, applying a more-negative voltage to VIN+ (pin 3) results in zero output current. Bidirectional measurement requires two INA169NA/250G4 devices configured in opposing polarity across the shunt, with external logic or a comparator to determine direction.
What is the purpose of the external load resistor (RL) in the INA169NA/250G4 circuit?
The external load resistor RL converts the INA169NA/250G4's output current (gm × VSENSE) into a measurable voltage. Its value sets system gain: VOUT = (1000 µA/V) × VSENSE × RL. For example, RL = 10 kΩ yields 10 V/V gain. RL values up to 100 kΩ maintain accuracy due to the device's high output impedance (>1 GΩ).
How does the quiescent current of the INA169NA/250G4 impact battery-powered designs?
With a typical quiescent current of 60 µA, the INA169NA/250G4 minimizes standby power loss-critical for battery-backed systems. In a 3.3 V system, this draws only 0.2 mW, enabling years of operation on coin cells or extending runtime in portable medical devices where continuous current monitoring is required.
Is the INA169NA/250G4 pin-compatible with the INA139 series?
Yes, the INA169NA/250G4 shares identical pinout, package (5-pin SOT-23), and functional architecture with the INA139 series. However, it differs in common-mode voltage range (60 V vs. 40 V), temperature specification (–40°C to +85°C vs. –40°C to +125°C), and offset voltage (±1 mV vs. ±1.5 mV), so substitution requires verification of these parameters in the target application.
INA169NA/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 ~ 60V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
INA169NA/250G4 FAQ
1.How can I place an order for INA169NA/250G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA169NA/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 INA169NA/250G4 reliable?
The price and inventory of INA169NA/250G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA169NA/250G4 is usually 5 days.
3.What payment methods are accepted for INA169NA/250G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA169NA/250G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA169NA/250G4?
INA169NA/250G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA169NA/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 INA169NA/250G4?
For technical support, including INA169NA/250G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA169NA/250G4 requirements.
6.How does Aetrix verify that INA169NA/250G4 is sourced from the original manufacturer or authorized distributors?
All INA169NA/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 INA169NA/250G4 meets industry standards.
7.What is the process for return or replacement of INA169NA/250G4?
All INA169NA/250G4 units undergo pre-shipment inspection (PSI). If there is an issue with INA169NA/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 INA169NA/250G4 part is unused and in its original packaging.
Return procedure for INA169NA/250G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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