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Texas Instruments INA169NA/250
- Part No.:
- INA169NA/250
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA169NA/250.pdf
- Description:
- IC CURRENT MONITOR 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:626
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Product details
Overview
INA169NA/250 from Texas Instruments is a high-side unipolar current shunt monitor IC in 5-pin SOT-23 package, delivering 1000 µA/V transconductance, ±1 mV offset voltage (max), 100 dB minimum common-mode rejection, and operation up to 60 V common-mode voltage - used for precision high-side current sensing in battery chargers and power management systems.
For engineers reviewing the INA169NA/250 datasheet, INA169NA/250 pinout, INA169NA/250 application, or INA169NA/250 equivalent, key selection considerations include its 2.7–60 V supply range, 60 µA quiescent current, 440 kHz bandwidth at 10 kΩ load, –40°C to +85°C operating temperature, and current-output architecture requiring external RL for gain setting.
Technical Context
The INA169NA/250 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. Its input common-mode voltage (2.7–60 V) operates independently of supply voltage (V+, also 2.7–60 V), supporting true high-side sensing where VIN+ exceeds V+.
It delivers fixed transconductance (1000 µA/V ±1%) with <±0.1% nonlinearity error over 10–150 mV sense range and maintains stable performance across temperature (±1 µV/°C offset drift). Output current compliance is limited by (V+ − 1.2 V) and (VIN+ − 0.6 V), whichever is lower.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transconductance | 1000 µA/V ±1% - defines precise current output per millivolt of sensed shunt voltage; sets system gain via external RL |
| Common-mode range | 2.7 V to 60 V - enables direct monitoring of high-side shunts in 48 V industrial or automotive battery systems |
| Offset voltage (max) | ±1 mV - limits zero-current measurement error to ≤0.2% FS when RS = 50 mΩ and IL = 20 A |
| Bandwidth | 440 kHz (RL = 10 kΩ) - supports fast transient current detection in switching power supplies |
| Quiescent current | 60 µA typical - allows permanent connection to high-side rail without significant power loss or heating |
| Nonlinearity error | ±0.1% max (10–150 mV) - ensures accuracy across >90% of full-scale shunt voltage range |
| CMRR | 100 dB min - rejects interference from noisy high-voltage rails during low-differential-signal measurement |
Pinout & Package
INA169NA/250 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 embedded power systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Current output terminal | Delivers 1000 × (VIN+ − VIN−) µA; requires external RL to ground to generate voltage output |
| GND (Pin 2) | Ground reference | Return path for internal circuitry; must be connected to system ground, not shunt ground |
| VIN+ (Pin 3) | Positive input | Connects to high-side of shunt resistor; accepts up to 60 V common-mode voltage |
| VIN− (Pin 4) | Negative input | Connects to low-side of shunt resistor; differential input must remain unipolar (VIN+ > VIN−) |
| V+ (Pin 5) | Power supply | Supplies internal circuitry; independent of VIN+; range 2.7–60 V; can be tied to load supply or isolated |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor gain setting | External RL determines full-scale output voltage (e.g., RL = 10 kΩ → 5 V FS for 0.5 V shunt drop) |
| High common-mode voltage tolerance | Supports direct sensing on 48 V bus rails without level-shifting or isolation components |
| Low quiescent current | 60 µA enables always-on current monitoring in battery-backed systems without measurable drain |
| Wide supply independence | V+ and VIN+ operate over separate 2.7–60 V ranges, allowing flexible power domain partitioning |
| High CMRR stability | Maintains ≥100 dB rejection up to 100 kHz, critical for noise immunity in motor drives and SMPS |
Applications
| Battery Charger Monitoring | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Real-time charge/discharge current tracking in 24–48 V Li-ion battery chargers with microcontroller-based state-of-charge calculation. IC Role / Device Role / Timing Role: High-side current shunt monitor converting shunt voltage to proportional output current for ADC digitization. Use Value: Enables ±0.5% total output error across temperature and supply variations, meeting IEC 62368-1 safety margin requirements. |
Use Scenario: Overcurrent protection and load regulation in programmable DC power supplies delivering up to 60 V/10 A. IC Role / Device Role / Timing Role: Fast-response current sensor feeding analog feedback loop to PWM controller. Use Value: 440 kHz bandwidth ensures sub-microsecond response to short-circuit events, enabling cycle-by-cycle shutdown. |
| Automotive Body Control Module | Portable Medical Device Power Management |
Use Scenario: Fuseless load monitoring for lighting, HVAC, and window lift circuits in 12 V/24 V vehicle architectures. IC Role / Device Role / Timing Role: Unidirectional high-side current monitor interfacing with CAN-connected ECU for diagnostics. Use Value: 60 µA quiescent current meets ISO 16750-2 sleep-mode leakage limits while maintaining readiness. |
Use Scenario: Precision battery discharge profiling in handheld ultrasound and infusion pumps with dual-cell Li-ion packs. IC Role / Device Role / Timing Role: Low-drift current sensor feeding SAR ADC for battery fuel gauging algorithm. Use Value: ±1 µV/°C offset drift minimizes SoC estimation drift over clinical operating temperature range (0–40°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current measurement applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1DR | Zero-drift architecture, 80 V common-mode, 2.5 µV/°C offset drift, 4 V/V fixed gain voltage output | Requires no external RL; better for ultra-low-offset DC monitoring but lacks programmable gain flexibility | Select when absolute offset stability < 25 µV over temperature is required and board space permits SOIC-8 |
| MAX4080TASA+ | Current-output like INA169, 76 V common-mode, 1200 µA/V transconductance, 125 µA IQ, SOT23-5 | Higher IQ and wider CM range suit 60–72 V telecom systems; slightly higher offset (±2 mV) | Select for 72 V battery systems where 60 µA IQ is not mandatory and ±2 mV offset is acceptable |
Compared with INA169NA/250, INA240A1DR offers superior DC precision but sacrifices gain configurability and current-output versatility, while MAX4080TASA+ extends voltage range at the cost of higher quiescent current and reduced offset accuracy - making INA169NA/250 optimal for cost-sensitive, space-constrained 48 V applications needing balanced performance.
Availability
INA169NA/250 is available at Aetrix Electronics and suitable for battery chargers, industrial power supplies, automotive body control modules, and portable medical devices requiring stable component supply across extended production lifecycles.
Supply support for INA169NA/250 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 specializing in analog, embedded processing, and digital signal technologies, with leadership in precision analog signal chains and power management ICs.
The INA1x9 family-including INA169NA/250-is designed specifically for high-side unipolar current sensing in space-constrained, high-voltage industrial and automotive power systems where supply and common-mode voltages must operate independently.
FAQ
What is the maximum common-mode voltage supported by the INA169NA/250?
The INA169NA/250 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. Absolute maximum rating extends to 75 V, but operation above 60 V risks parametric degradation and is not guaranteed.
Does the INA169NA/250 require an external load resistor, and why?
Yes, the INA169NA/250 requires an external load resistor (RL) connected between OUT (Pin 1) and GND (Pin 2) to convert its current output into a measurable voltage. Because it is a transconductance amplifier (1000 µA/V), RL directly sets system gain: VOUT = 1000 µA/V × (VIN+ − VIN−) × RL. Typical values range from 1 kΩ to 100 kΩ depending on desired full-scale output voltage.
Can the INA169NA/250 measure bidirectional current, and if not, what is required?
No, the INA169NA/250 is a unipolar device and only measures current flowing in one direction (VIN+ > VIN−). To achieve bidirectional measurement, two INA169NA/250 units must be used-one across the shunt with forward polarity and one with reversed polarity-alongside a comparator or differential ADC to determine direction and magnitude, as shown in TI's Figure 15 and Figure 17 application schematics.
What is the operating temperature range for the INA169NA/250?
The INA169NA/250 is specified for operation from –40°C to +85°C ambient temperature. This range is explicitly stated in the Electrical Characteristics table and distinguishes it from the INA139 variant, which is rated to +125°C. Junction temperature must not exceed 150°C under any condition.
How does the quiescent current of the INA169NA/250 impact system power budget?
The INA169NA/250 draws only 60 µA typical quiescent current, making it suitable for always-on current monitoring in battery-powered systems. For example, in a 3.7 V Li-ion system, this adds just 0.22 µW of continuous dissipation - negligible compared to typical MCU sleep currents and well within ISO 16750-2 leakage limits for automotive modules.
INA169NA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/250 FAQ
1.How can I place an order for INA169NA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA169NA/250 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/250 reliable?
The price and inventory of INA169NA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA169NA/250 is usually 5 days.
3.What payment methods are accepted for INA169NA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA169NA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA169NA/250?
INA169NA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA169NA/250 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/250?
For technical support, including INA169NA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA169NA/250 requirements.
6.How does Aetrix verify that INA169NA/250 is sourced from the original manufacturer or authorized distributors?
All INA169NA/250 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/250 meets industry standards.
7.What is the process for return or replacement of INA169NA/250?
All INA169NA/250 units undergo pre-shipment inspection (PSI). If there is an issue with INA169NA/250, 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/250 part is unused and in its original packaging.
Return procedure for INA169NA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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