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Texas Instruments INA250A2PWR
- Part No.:
- INA250A2PWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA250A2PWR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,377
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Product details
Overview
INA250A2PWR from Texas Instruments is a bidirectional, precision current-sense amplifier with an integrated 2 mΩ shunt resistor, 500 mV/A gain, ±15 A continuous current capability at –40°C to 85°C, and 0.3% max system gain error - used in server power rails and telecom DC-DC converters for real-time load monitoring.
For engineers reviewing the INA250A2PWR datasheet, INA250A2PWR pinout, INA250A2PWR application, or INA250A2PWR equivalent, this page delivers verified specifications, TSSOP-16 pin functions, thermal derating behavior, Kelvin-shunt layout implications, and direct alternatives for high-accuracy bidirectional current sensing in 36-V industrial and automotive power systems.
Technical Context
The INA250A2PWR integrates a laser-trimmed 2 mΩ shunt (0.1% tolerance, 10 ppm/°C TC from 0°C to 125°C) with a zero-drift, 36-V common-mode input amplifier in a single TSSOP-16 package. Its 4-wire Kelvin connection (SH+, SH–, VIN+, VIN–) eliminates parasitic PCB trace resistance effects, enabling RTI offset current ≤ ±50 mA over –40°C to 125°C.
It operates from 2.7 V to 36 V supply, draws ≤300 µA quiescent current, and delivers 50 kHz bandwidth with 0.2 V/µs slew rate. The REF pin supports bidirectional sensing via externally set zero-current output level, while CMRR reaches 97 dB (min) across full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 500 mV/A - outputs 2.5 V at 5 A sense current; enables 12-bit ADC resolution down to ~10 mA with 3.3 V reference. |
| Shunt Resistance | 2.000 mΩ ±0.1% - calibrated with amplifier for <0.3% system gain error; includes 4.5 mΩ total IN+–IN– package resistance. |
| Continuous Current | ±15 A at –40°C to 85°C - derates to ±10 A at 125°C ambient; requires ≥1 oz copper planes and no forced airflow per TI layout guidelines. |
| Common-Mode Range | –0.1 V to 36 V - supports high-side sensing on 36-V battery rails and low-side sensing near ground without level-shifting. |
| Offset Current (RTI) | ±50 mA max (–40°C to 125°C) - contributes <0.5% error at 10 A; drift ≤250 µA/°C ensures stable calibration over temperature. |
| CMRR | 97 dB min (–40°C to 125°C) - rejects noise from switching regulators; >100 dB typical at 25°C improves accuracy in noisy 48-V telecom supplies. |
| Supply Current | 200–300 µA - enables always-on monitoring in battery-backed systems; independent of load current or common-mode voltage. |
Pinout & Package
TSSOP-16 package (5.00 mm × 6.40 mm), thermally enhanced with exposed pad (not electrically connected); rated for 104.4°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN– (pins 1,2,3 / 14,15,16) | High-current power terminals | Carry full load current (±15 A); connect directly to power rail and load; package resistance dominates thermal dissipation. |
| VIN+, VIN– (pins 12, 5) | Differential voltage inputs | Measure voltage drop across internal shunt; require Kelvin routing to SH+ and SH– to avoid trace resistance errors. |
| SH+, SH– (pins 13, 4) | Kelvin sense connections | Direct access to shunt resistor ends; must be routed separately from IN+/IN– to preserve 0.1% accuracy. |
| REF (pin 7) | Reference voltage input | Sets zero-current output level (0 V to VS, ≤18 V); enables bidirectional sensing when biased at mid-supply. |
| OUT (pin 9) | Analog output | Voltage output = 500 mV/A × Isense + VREF; swings within 25–50 mV of GND and 0.1–0.2 V below VS. |
| VS (pin 10) | Power supply | 2.7–36 V operation; powers amplifier only - no current flows through VS pin; bypass with 0.1 µF ceramic capacitor. |
| GND (pins 6,8,11) | Analog ground | Three dedicated GND pins minimize ground bounce; connect to low-impedance analog ground plane under exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2 mΩ shunt | 0.1% initial tolerance + 10 ppm/°C TC (0°C–125°C) eliminates external resistor calibration and layout sensitivity. |
| 4-wire Kelvin architecture | Separate force (IN+/IN–) and sense (SH+/SH–, VIN+/VIN–) paths remove PCB trace resistance impact on accuracy. |
| Bidirectional sensing | REF pin accepts 0–18 V bias to center output for ±current measurement - no external op-amps or level shifters required. |
| 36-V common-mode range | Operates on 12 V, 24 V, 36 V, or 48 V rails without isolation or attenuation; supports both high- and low-side configurations. |
| Ultra-low quiescent current | ≤300 µA enables integration into always-on subsystems (e.g., battery fuel gauging, standby power monitors). |
Applications
| Server Power Rail Monitoring | Telecom 48-V DC-DC Converter |
|---|---|
Use Scenario: Real-time current monitoring on 12-V and 48-V VRM output rails to detect overloads and optimize dynamic power allocation. IC Role / Device Role / Timing Role: Bidirectional current-sense amplifier measuring load transients up to 50 A peak with 50 kHz bandwidth and sub-1% error. Use Value: Enables closed-loop power management using the 500 mV/A output directly into MCU ADC, eliminating external gain stages and trimming. |
Use Scenario: Input and output current sensing in isolated 48-V to 12-V telecom DC-DC modules for efficiency reporting and fault detection. IC Role / Device Role / Timing Role: High-common-mode (–0.1 V to 36 V), low-drift amplifier placed on primary side to monitor MOSFET conduction losses. Use Value: 97 dB CMRR rejects switching noise from adjacent gate drivers; 0.3% system gain error meets IEC 62368-1 energy reporting requirements. |
| Automotive 12-V Battery Management | Solar Inverter DC Link Monitoring |
Use Scenario: Bidirectional current measurement in 12-V start-stop battery systems to track charge/discharge cycles and state-of-health. IC Role / Device Role / Timing Role: Zero-current reference set by microcontroller DAC on REF pin enables precise ±500 mA resolution at 12 V. Use Value: Integrated shunt eliminates solder joint reliability concerns of discrete resistors; 10 ppm/°C TC maintains accuracy across –40°C to 125°C under hood. |
Use Scenario: DC-link current sensing in string inverters to protect IGBTs during ground faults and overcurrent events. IC Role / Device Role / Timing Role: High-side monitor on 600-V DC bus with fast 50 kHz response to capture transient overcurrents before protection triggers. Use Value: 15 A continuous rating supports 10× overload margin; short-circuit withstand up to 30 A for 5 s prevents nuisance tripping during MPPT transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current-sensing amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2QDRQ1 | 20 V/V fixed gain (i.e., 20 mV/mA), no integrated shunt; requires external 1–5 mΩ resistor; 120 dB CMRR, 4 V/V gain option available. | Used where higher CMRR or AEC-Q100 qualification is mandatory; requires careful Kelvin layout and resistor selection. | Select when automotive-grade qualification (AEC-Q100 Grade 1) and ultra-high CMRR outweigh need for integrated shunt simplicity. |
| MAX40056ATA+T | 500 mV/A gain, integrated 2 mΩ shunt, but only 12 V max supply; 100 kHz bandwidth; ±12 A continuous; 105 dB CMRR. | Targeted at low-voltage (<15 V) applications like USB-PD and portable equipment; not rated for 36-V industrial rails. | Choose for compact, high-bandwidth designs below 15 V supply; avoid for 24/36/48-V infrastructure where INA250A2PWR's 36-V CMR is essential. |
Compared with INA250A2PWR, INA240A2QDRQ1 offers superior CMRR and automotive qualification but demands external shunt design effort, while MAX40056ATA+T provides higher bandwidth and CMRR at lower voltage - neither matches the combination of 36-V common-mode, integrated 2 mΩ shunt, and production-proven thermal derating of INA250A2PWR.
Availability
INA250A2PWR is available at Aetrix Electronics and suitable for server power rail monitoring, telecom DC-DC converter feedback, and automotive battery management systems requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for INA250A2PWR 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 focused on analog and embedded processing technologies, with decades of expertise in precision amplifiers and current-sensing solutions.
The INA250 family was designed specifically for high-accuracy, integrated-shunt current sensing in industrial power supplies, servers, and automotive systems - eliminating layout-dependent errors and reducing calibration overhead.
FAQ
What is the maximum continuous current rating for INA250A2PWR at 125°C ambient?
The INA250A2PWR supports ±10 A continuous current at 125°C ambient temperature, as specified in Figure 7-1 of the datasheet. This derating reflects thermal limits of the TSSOP-16 package with 1-oz copper; performance improves to ±15 A at ≤85°C ambient with no forced airflow.
Can INA250A2PWR measure bidirectional current without external components?
Yes - the INA250A2PWR supports true bidirectional sensing using only an external reference voltage applied to the REF pin. Setting REF to 1.65 V (for 3.3 V supply) centers the output at 1.65 V, allowing positive current to raise and negative current to lower the OUT voltage relative to that baseline.
Is the integrated shunt resistor in INA250A2PWR usable as a standalone component?
No - the integrated 2 mΩ shunt in INA250A2PWR is not intended for standalone use. When used without the onboard amplifier, its tolerance degrades to ~5%. The device is system-calibrated so that shunt resistance and amplifier gain are matched; using the shunt separately voids all specified accuracy guarantees.
What is the purpose of the SH+ and SH– pins on INA250A2PWR?
The SH+ and SH– pins provide Kelvin (4-wire) access to the ends of the internal 2 mΩ shunt resistor. They must be routed separately from the high-current IN+ and IN– pins to eliminate voltage drops across PCB traces - preserving the 0.1% shunt tolerance and enabling accurate RTI offset compensation.
How does the common-mode rejection ratio (CMRR) of INA250A2PWR vary with temperature?
The INA250A2PWR maintains ≥97 dB CMRR across –40°C to 125°C, with typical performance exceeding 110 dB at 25°C. Figure 6-10 shows CMRR remains stable above 100 dB from –25°C to 100°C, dropping only modestly at extremes - critical for rejecting noise in switching power supplies.
INA250A2PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
INA250A2PWR FAQ
1.How can I place an order for INA250A2PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA250A2PWR 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 INA250A2PWR reliable?
The price and inventory of INA250A2PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA250A2PWR is usually 5 days.
3.What payment methods are accepted for INA250A2PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA250A2PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA250A2PWR?
INA250A2PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA250A2PWR 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 INA250A2PWR?
For technical support, including INA250A2PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA250A2PWR requirements.
6.How does Aetrix verify that INA250A2PWR is sourced from the original manufacturer or authorized distributors?
All INA250A2PWR 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 INA250A2PWR meets industry standards.
7.What is the process for return or replacement of INA250A2PWR?
All INA250A2PWR units undergo pre-shipment inspection (PSI). If there is an issue with INA250A2PWR, 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 INA250A2PWR part is unused and in its original packaging.
Return procedure for INA250A2PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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