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Texas Instruments INA250A3PW
- Part No.:
- INA250A3PW
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA250A3PW.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,141
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Product details
Overview
INA250A3PW from Texas Instruments is a bidirectional, precision current-sense amplifier with an integrated 2 mΩ shunt resistor, 800 mV/A gain, ±15 A continuous current capability at –40°C to 85°C, and 106–114 dB CMRR over –40°C to 125°C - used for high-accuracy power rail monitoring in telecom rectifiers and server VRMs.
For engineers reviewing the INA250A3PW datasheet, INA250A3PW pinout, INA250A3PW application, or INA250A3PW equivalent, this page delivers verified specifications, TSSOP-16 package layout, real-world use cases in power management systems, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The INA250A3PW implements a zero-drift, 36-V common-mode input architecture with Kelvin-connected internal shunt (SH+/SH–) enabling true bidirectional sensing independent of supply voltage. Its amplifier stage is factory-matched to the integrated 2 mΩ resistor, achieving system-level gain error ≤±0.3% across –40°C to 125°C.
It operates from 2.7 V to 36 V supply, draws ≤300 µA quiescent current, and delivers 35 kHz bandwidth with 0.2 V/µs slew rate. The REF pin supports external biasing for bidirectional current measurement, while VIN+/VIN– provide direct access to shunt terminals for optional filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 800 mV/A - outputs 0.8 V per ampere sensed; enables 12.5 A full-scale on 10 V ADC range |
| Integrated Shunt Resistance | 2.000 mΩ ±0.1% - precision-matched to amplifier for calibrated system accuracy |
| Common-Mode Range | –0.1 V to 36 V - measures current on negative rails or high-side 36 V supplies without level-shifting |
| CMRR | 106–114 dB (–40°C to 125°C) - rejects noise from noisy power rails in telecom/base station designs |
| Offset Current (RTI) | ±5 mA max (–40°C to 125°C) - contributes <±0.04% error at 12.5 A full scale |
| Bandwidth | 35 kHz (CL = 10 pF) - supports fast transient detection in digital power control loops |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and industrial power modules |
Pinout & Package
TSSOP-16 package (5.00 mm × 6.40 mm), thermally enhanced with three GND pins (6, 8, 11) and exposed thermal pad (not electrically connected per datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN− (pins 1–3, 14–16) | Analog inputs | High-impedance amplifier inputs; connect to load/supply sides of external circuit - not directly to shunt |
| VIN+, VIN− (pins 12, 5) | Analog inputs | Kelvin connections to internal shunt ends; required for accurate sensing - routing determines noise immunity |
| SH+, SH− (pins 13, 4) | Analog outputs | Direct Kelvin sense nodes of integrated shunt; bypass filtering recommended if high-frequency noise present |
| REF (pin 7) | Analog input | Reference bias point (0 V to VS, ≤18 V); sets zero-current output level for bidirectional operation |
| OUT (pin 9) | Analog output | Voltage output = VREF + (800 mV/A) × ISENSE; rail-to-rail swing limited to (VS − 0.2 V) / (GND + 50 mV) |
| VS (pin 10) | Analog supply | Single 2.7–36 V supply; powers amplifier and internal shunt bias - no separate analog/digital rails |
| GND (pins 6, 8, 11) | Analog ground | Three dedicated low-impedance ground returns; critical for minimizing offset drift and thermal EMF errors |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2 mΩ shunt with 0.1% tolerance | Eliminates external resistor selection, layout mismatch, and calibration drift - ensures system-level accuracy without user trimming |
| 10 ppm/°C shunt tempco (0°C–125°C) | Reduces temperature-induced gain error to <±0.1% over full operating range - avoids costly system recalibration |
| 36 V common-mode input range | Enables direct high-side sensing on 24 V/36 V industrial buses and telecom -48 V return paths without attenuators |
| Bidirectional sensing via REF pin | Supports regenerative braking monitoring and dual-supply power converters using single-ended ADC interface |
| 300 µA max supply current | Minimizes self-heating impact on shunt accuracy and enables always-on monitoring in battery-backed systems |
Applications
| Telecom Rectifier Monitoring | Server VRM Current Sensing |
|---|---|
Use Scenario: Real-time current monitoring of 48 V DC input to telecom rectifier modules with ±10% line regulation and 50 kHz switching noise. IC Role / Device Role / Timing Role: High-side bidirectional current sensor feeding isolated sigma-delta ADC; REF biased to 2.5 V for symmetric ±6.25 A range. Use Value: 106 dB CMRR rejects PWM noise; 35 kHz bandwidth captures load transients; integrated shunt eliminates layout sensitivity to trace resistance. |
Use Scenario: Per-phase current sensing in 12 V server VRMs delivering up to 200 A with multi-phase interleaving. IC Role / Device Role / Timing Role: Low-side current monitor placed between MOSFET source and ground; OUT drives 12-bit SAR ADC with 1 µs sampling window. Use Value: 2 mΩ shunt dissipates only 0.5 W at 50 A; 0.1% tolerance ensures phase-balance accuracy across 6-phase designs. |
| Solar Inverter DC Link Monitoring | Automotive On-Board Charger (OBC) |
Use Scenario: Bidirectional DC link current measurement in 1000 V string inverters during MPPT and grid-feed modes. IC Role / Device Role / Timing Role: Isolated current sensor front-end; INA250A3PW output referenced to isolated 3.3 V domain via optocoupler or digital isolator. Use Value: –0.1 V to 36 V common-mode range accommodates floating DC bus measurements; 125°C rating survives under-hood ambient. |
Use Scenario: Input AC-DC and output DC-DC current monitoring in 11 kW OBCs with active cooling and 40°C–105°C ambient range. IC Role / Device Role / Timing Role: Dual-channel sensing (AC input + DC output) using two INA250A3PW units; synchronized sampling for efficiency calculation. Use Value: Matched gain and tempco between units minimizes inter-channel error; TSSOP-16 footprint allows compact placement near power stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision current-sensing amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3 | No integrated shunt; requires external 2 mΩ resistor; 120 dB CMRR; 4 V/V fixed gain (equivalent to 4000 mV/A) | Higher gain but no built-in calibration; needs careful Kelvin layout and resistor matching | Select when higher gain or custom shunt value is needed; avoid if board space or calibration time is constrained |
| MAX40088AUA+ | Integrated 5 mΩ shunt; 500 mV/A gain; 2.7–5.5 V supply only; 85°C max operating temp | Limited to low-voltage systems; unsuitable for 24 V+ rails or extended temperature industrial use | Select for cost-sensitive consumer power banks or USB-PD adapters where 36 V CM and 125°C are unnecessary |
Compared with INA240A3 and MAX40088AUA+, the INA250A3PW uniquely combines factory-calibrated 2 mΩ shunt, 36 V common-mode, and 125°C operation - making it the only option for high-reliability, high-voltage, high-temperature current sensing without external calibration.
Availability
INA250A3PW is available at Aetrix Electronics and suitable for telecom rectifier monitoring, server VRM current sensing, and solar inverter DC link applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA250A3PW 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 INA250 family was designed specifically for high-accuracy, integrated current sensing in industrial power supplies, telecom infrastructure, and automotive electrification - eliminating layout-dependent errors and reducing system calibration burden.
FAQ
What is the maximum continuous current rating for the INA250A3PW at 125°C ambient?
The INA250A3PW supports ±10 A continuous current at 125°C ambient temperature, derated from ±15 A at 85°C per Figure 7-1 in the datasheet. This rating assumes 1-oz copper planes and no forced airflow. With 2-oz copper and airflow, ±15 A is sustainable across –40°C to 125°C. The INA250A3PW's thermal design relies on total package resistance (4.5 mΩ), not just the 2 mΩ shunt element.
Can the integrated shunt resistor in the INA250A3PW be used independently of the amplifier?
No - the integrated shunt resistor in the INA250A3PW is not intended for standalone use. Datasheet Section 6.5 explicitly states it is "intended to be used with the internal amplifier" and that using it alone results in ~5% tolerance. The INA250A3PW's 0.1% system accuracy depends on factory matching between the 2 mΩ resistor and amplifier gain; separating them voids calibration and violates TI's usage guidance.
How does the REF pin enable bidirectional current measurement in the INA250A3PW?
The REF pin in the INA250A3PW sets the output voltage corresponding to zero sensed current. When REF = 0 V, the INA250A3PW outputs positive voltage for positive current (unidirectional). For bidirectional operation, applying a mid-supply voltage (e.g., 2.5 V on 5 V VS) makes the INA250A3PW output swing above and below that reference - e.g., 2.5 V ±1.0 V for ±1.25 A at 800 mV/A gain - enabling single-supply ADC capture of both directions.
What is the bandwidth and slew rate of the INA250A3PW, and how do they affect dynamic response?
The INA250A3PW has a 35 kHz small-signal bandwidth (CL = 10 pF) and 0.2 V/µs slew rate. These values allow accurate reproduction of current transients up to ~20 kHz with <1% distortion, supporting digital power supply control loops and fault detection in motor drives. Bandwidth drops with capacitive load; slew rate limits large-signal step response to ~5 µs for 1 V output swing, as shown in Figure 6-27.
Does the INA250A3PW require external filtering on the SH+ and SH− pins?
External RC filtering on SH+ and SH− is optional but recommended in noisy environments. Figure 7-4 in the datasheet shows a 10 Ω + 1 nF filter for EMI suppression without degrading bandwidth. The INA250A3PW's internal Kelvin connections already minimize parasitic impedance; adding filters trades off high-frequency noise rejection against phase margin and transient fidelity - especially critical in closed-loop power systems.
INA250A3PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.2V/µs
- Gain Bandwidth Product:
- 50 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 28 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 200µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
INA250A3PW FAQ
1.How can I place an order for INA250A3PW through Aetrix?
Please submit a Request for Quotation (RFQ) for INA250A3PW 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 INA250A3PW reliable?
The price and inventory of INA250A3PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA250A3PW is usually 5 days.
3.What payment methods are accepted for INA250A3PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA250A3PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA250A3PW?
INA250A3PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA250A3PW 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 INA250A3PW?
For technical support, including INA250A3PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA250A3PW requirements.
6.How does Aetrix verify that INA250A3PW is sourced from the original manufacturer or authorized distributors?
All INA250A3PW 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 INA250A3PW meets industry standards.
7.What is the process for return or replacement of INA250A3PW?
All INA250A3PW units undergo pre-shipment inspection (PSI). If there is an issue with INA250A3PW, 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 INA250A3PW part is unused and in its original packaging.
Return procedure for INA250A3PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA250A3PW Tags
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