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Texas Instruments INA169NA/3KG4
- Part No.:
- INA169NA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA169NA/3KG4.pdf
- Description:
- IC CURRENT MONITOR 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,165
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Product details
Overview
INA169NA/3KG4 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) for precision current sensing in power rails up to 60 V. It operates from –40°C to +85°C and supports battery chargers, portable power management, and automotive load monitoring.
For engineers reviewing the INA169NA/3KG4 datasheet, INA169NA/3KG4 pinout, INA169NA/3KG4 application, or INA169NA/3KG4 equivalent, key selection considerations include its independent supply/common-mode voltage operation, single-resistor gain configuration via external RL, low 60 µA quiescent current, and compatibility with ADC buffering and bipolar measurement topologies.
Technical Context
The INA169NA/3KG4 integrates a high-voltage precision op amp, laser-trimmed thin-film resistors, and a low-noise output transistor to enable accurate differential voltage-to-current conversion across large common-mode voltages. Its input stage accepts VIN+ up to 60 V while operating from a separate 2.7–60 V V+ supply.
It functions as a transconductance amplifier with fixed gm = 1000 µA/V, where output current IO = gm × (VIN+ − VIN−), converted to voltage by an external load resistor RL. Output compliance is constrained by both V+ and VIN+, limiting maximum VO to min[(V+) − 1.2 V, VIN+ − 1 V].
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transconductance | 1000 µA/V - defines precise linear relationship between shunt voltage and output current; enables gain setting via RL only |
| Max Common-Mode Voltage | 60 V - allows direct high-side sensing on 48 V systems and industrial power rails without level-shifting circuitry |
| Offset Voltage (max) | ±1 mV - contributes ≤0.2% error at 500 mV full-scale sense voltage; critical for low-current accuracy |
| Quiescent Current | 60 µA (typ) - enables always-on current monitoring in battery-backed systems with minimal standby drain |
| Bandwidth | 440 kHz (RL = 10 kΩ) - supports fast transient detection in motor control and DC-DC converter monitoring |
| CMRR | 100 dB (min) - rejects noise from noisy power buses, ensuring stable output under EMI-rich conditions |
| Operating Temp Range | –40°C to +85°C - qualified for automotive cabin and industrial ambient environments |
Pinout & Package
INA169NA/3KG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in portable and automotive electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Current output terminal | Delivers gm × (VIN+ − VIN−); requires external RL to ground to generate voltage output; high impedance (>1 GΩ) |
| GND (Pin 2) | Analog ground reference | Return path for internal biasing; must be connected to system ground with low-impedance trace to minimize noise coupling |
| VIN+ (Pin 3) | Positive differential input | Connects to high-side of shunt; accepts up to 60 V common-mode voltage independent of V+ |
| VIN− (Pin 4) | Negative differential input | Connects to low-side of shunt; differential input range limited to 0–500 mV for accuracy; polarity-sensitive |
| V+ (Pin 5) | Power supply input | Supplies internal circuitry; operates from 2.7–60 V; may be tied to VIN+ or isolated for enhanced PSR |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain configuration | Gain set solely by external RL value (e.g., 10 kΩ → 10 V/V); eliminates trimming resistors and simplifies BOM |
| Independent supply & common-mode rails | V+ and VIN+ can be different supplies (e.g., V+ = 5 V logic rail, VIN+ = 48 V bus); enables flexible system partitioning |
| Low quiescent current | 60 µA typical - allows continuous monitoring in energy-sensitive applications like IoT sensors and backup systems |
| High CMRR over frequency | ≥100 dB up to 10 kHz - maintains accuracy in presence of switching noise from DC-DC converters and inverters |
| Unipolar high-side sensing | Designed for forward current only (VIN+ > VIN−); avoids complexity of bidirectional architectures unless paired externally |
Applications
| Battery Charger Monitoring | Automotive Load Diagnostics |
|---|---|
Use Scenario: Real-time charge/discharge current tracking in 12 V/48 V EV onboard chargers and portable battery packs. IC Role / Device Role / Timing Role: High-side current shunt monitor converting shunt voltage to proportional output current for microcontroller ADC sampling. Use Value: Enables ±0.5% total output error over temperature and supply variation, supporting precise state-of-charge estimation without calibration drift. |
Use Scenario: Detecting abnormal current draw in vehicle body control modules (BCM), lighting circuits, and HVAC actuators. IC Role / Device Role / Timing Role: Unipolar current sensor placed on fused 12 V supply lines to identify short-circuit or open-load faults. Use Value: 60 V common-mode rating accommodates load dump transients; 440 kHz bandwidth captures fast fault events before fuse interruption. |
| Portable Power Management | Industrial DC Power Supply Monitoring |
Use Scenario: Measuring system-level current consumption in handheld medical devices and ruggedized tablets with Li-ion batteries. IC Role / Device Role / Timing Role: Low-quiescent-current shunt monitor feeding buffered output to SAR ADC for runtime estimation and thermal throttling. Use Value: 60 µA IQ minimizes impact on battery life; SOT-23 footprint saves board area in compact enclosures with tight thermal constraints. |
Use Scenario: Monitoring output current of programmable 24–60 V industrial DC power supplies used in PLC I/O modules and test equipment. IC Role / Device Role / Timing Role: High-side current feedback element in closed-loop regulation and overcurrent protection circuitry. Use Value: 1000 µA/V transconductance provides stable, temperature-invariant gain; 100 dB CMRR rejects noise from adjacent switching regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA219BIDR | Digital I²C-output current/power monitor; integrated 12-bit ADC, on-chip shunt; no external RL required | Requires microcontroller I²C interface; lacks analog output flexibility; lower bandwidth (max 1 kHz) | Choose for digital BOM consolidation and power calculation; avoid when analog output or >1 kHz response is needed |
| MAX4080TASA+ | Pin-compatible 5-pin SOT-23; higher 120 dB CMRR; wider –40°C to +125°C temp range; 2.7–76 V common-mode | Supports extended automotive under-hood and industrial ambient temperatures; better noise immunity in high-EMI settings | Choose for harsh-environment deployments requiring >85°C operation or superior CMRR; same layout but higher cost |
Compared with INA169NA/3KG4, INA219BIDR trades analog flexibility and speed for digital integration and ease of use, while MAX4080TASA+ offers enhanced robustness and performance at higher temperature and noise margins-both require revalidation of gain scaling and thermal design.
Availability
INA169NA/3KG4 is available at Aetrix Electronics and suitable for battery chargers, automotive diagnostics, and portable power management requiring stable component supply across production lifecycles.
Supply support for INA169NA/3KG4 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, embedded processing, and connectivity technologies, with decades of expertise in precision signal conditioning and power management ICs.
The INA1x9 family-including INA169NA/3KG4-is designed specifically for unipolar high-side current sensing in automotive, industrial, and portable systems where wide common-mode range and low IQ are essential.
FAQ
What is the maximum common-mode voltage supported by the INA169NA/3KG4?
The INA169NA/3KG4 supports a maximum common-mode input voltage of 60 V, as specified in its Recommended Operating Conditions. This allows direct high-side sensing on 48 V systems and industrial power rails. The absolute maximum rating extends to 75 V, but operation beyond 60 V is not guaranteed for accuracy or reliability. Always verify VIN+ and V+ remain within their respective recommended ranges during design validation.
Can the INA169NA/3KG4 measure bidirectional current?
No, the INA169NA/3KG4 is a unipolar high-side current shunt monitor and only measures forward current (VIN+ > VIN−). Attempting reverse polarity results in zero output current. For bidirectional measurement, two INA169NA/3KG4 devices must be used in opposing configurations with external diodes and a comparator, as shown in TI's SBOS181F datasheet Figure 15. Alternatively, consider purpose-built bidirectional parts like the INA226.
How is gain set for the INA169NA/3KG4, and what is the role of RL?
Gain for the INA169NA/3KG4 is set exclusively by the external load resistor RL connected between OUT (Pin 1) and ground. Since the device delivers a current output IO = 1000 µA/V × (VIN+ − VIN−), the resulting voltage is VO = IO × RL. For example, RL = 10 kΩ yields 10 V/V gain. RL values up to 100 kΩ maintain excellent accuracy due to the device's high output impedance (>1 GΩ).
Does the INA169NA/3KG4 require a separate power supply for V+?
No-the INA169NA/3KG4 does not require a separate V+ supply. V+ may be tied directly to VIN+ (e.g., 48 V bus) or derived from a local low-voltage rail (e.g., 3.3 V or 5 V), as long as it remains within 2.7–60 V. Using an isolated V+ improves power supply rejection ratio (PSRR) and reduces coupling of supply noise into the output, especially in mixed-signal systems.
What is the typical quiescent current of the INA169NA/3KG4, and why does it matter?
The INA169NA/3KG4 has a typical quiescent current of 60 µA, with a maximum of 125 µA across temperature and supply. This ultra-low IQ enables continuous current monitoring in battery-powered and energy-harvesting applications without significant impact on runtime. In systems with multiple INA169NA/3KG4 units, total standby current remains predictable and scalable-critical for UL/CE certification and thermal management.
INA169NA/3KG4 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/3KG4 FAQ
1.How can I place an order for INA169NA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA169NA/3KG4 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/3KG4 reliable?
The price and inventory of INA169NA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA169NA/3KG4 is usually 5 days.
3.What payment methods are accepted for INA169NA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA169NA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA169NA/3KG4?
INA169NA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA169NA/3KG4 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/3KG4?
For technical support, including INA169NA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA169NA/3KG4 requirements.
6.How does Aetrix verify that INA169NA/3KG4 is sourced from the original manufacturer or authorized distributors?
All INA169NA/3KG4 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/3KG4 meets industry standards.
7.What is the process for return or replacement of INA169NA/3KG4?
All INA169NA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA169NA/3KG4, 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/3KG4 part is unused and in its original packaging.
Return procedure for INA169NA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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