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Texas Instruments INA254A1IPWAR
- Part No.:
- INA254A1IPWAR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-SOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
INA254A1IPWAR.pdf
- Description:
- 80-V, BIDIRECTIONAL 50-A ZERO-DR
- Quantity:
- Payment:
- Shipping:
Inventory:1,961
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Product details
Overview
INA254A1IPWAR from Texas Instruments is a high-voltage, bidirectional current-shunt monitor integrating a precision 400-µΩ shunt resistor and zero-drift amplifier in a single 24-pin HTSSOP package. It delivers 20 mV/A gain, ±75-A continuous current capability at 25°C, 0.5% system gain error (max), and operates across –40°C to +125°C with a –4 V to +80 V common-mode input range. It enables real-time current measurement in high-dv/dt motor-drive and solenoid control systems.
For engineers reviewing the INA254A1IPWAR datasheet, INA254A1IPWAR pinout, INA254A1IPWAR application, or INA254A1IPWAR equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and PWM rejection performance, and two rigorously cross-checked alternative parts for high-side bidirectional sensing in industrial power electronics.
Technical Context
The INA254A1IPWAR implements a Kelvin-connected, 400-µΩ integrated shunt with 10 ppm/°C drift (0°C–125°C) and 2 nH inductance, paired with a zero-drift chopped amplifier achieving DC CMRR > 120 dB and 90 dB AC CMRR at 50 kHz. Its enhanced PWM rejection circuitry suppresses large dv/dt transients without requiring external filtering.
It supports bidirectional operation via dual reference inputs (REF1/REF2), delivers 350 kHz –3 dB bandwidth and 2 µs settling time to 1%, and maintains output swing within 50 mV of VS and 10 mV of GND under load - all while drawing only 2.4 mA from a 2.7–5.5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 mV/A - fixed, factory-trimmed gain enabling direct voltage output proportional to sensed current without external scaling. |
| Shunt Resistance | 400 µΩ ±0.5% - precision Kelvin-connected on-die resistor optimized for low-inductance, high-current sensing with minimal parasitic effects. |
| Common-Mode Range | –4 V to +80 V - supports high-side sensing in 48-V and 80-V bus systems independent of supply voltage. |
| System Gain Error | ±0.5% max - includes combined error of shunt tolerance and amplifier gain accuracy, specified over full temperature range. |
| Input Offset Drift | ±625 µA/°C - referred-to-input drift limiting long-term accuracy degradation across –40°C to +125°C ambient. |
| Supply Current | 2.4 mA max - enables low-power operation in battery-backed or energy-sensitive industrial subsystems. |
| Bandwidth | 350 kHz - supports fast overcurrent detection and accurate capture of PWM-modulated current waveforms up to 100 kHz (2% THD+N). |
Pinout & Package
INA254A1IPWAR is housed in a thermally enhanced 24-pin HTSSOP (PWA) package measuring 9.50 mm × 4.40 mm, with exposed thermal pad for improved heat dissipation during high-current operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IS+, IS– | Shunt current terminals | High-current Kelvin force connections to integrated 400-µΩ resistor; rated for ±75 A continuous at 25°C. |
| SH+, SH– | Shunt sense terminals | Low-current Kelvin sense connections directly to resistor ends - used for IN+ and IN– to eliminate PCB trace resistance errors. |
| IN+, IN– | Amplifier inputs | Differential inputs to zero-drift amplifier; connected to SH+ and SH– for optimal accuracy and CMRR. |
| REF1, REF2 | Bidirectional reference inputs | Set output zero point; connecting both to VS/2 enables symmetric ± current measurement around mid-supply. |
| OUT | Analog output | Voltage output = G × ISENSE + VREF, where G = 20 mV/A; rail-to-rail capable with 10-mV headroom to GND and 50-mV to VS. |
| VS, GND | Power supply | Single 2.7–5.5 V supply; GND serves as analog and power reference for internal amplifier and shunt. |
| DNC (pins 4,9,16,21) | No-connect | Must remain floating; connection risks internal node interference or latch-up. |
| NC (pins 1,24) | No internal connection | May be left floating, grounded, or tied to VS; connecting to IS+ simplifies high-current routing in PCB layout. |
| RES (pin 15) | Reserved | Internally reserved; must be connected to GND per datasheet to ensure proper functionality. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Kelvin shunt | 400-µΩ ±0.5% resistor with 2 nH inductance and 10 ppm/°C drift - eliminates external resistor selection, layout sensitivity, and thermal mismatch errors. |
| Enhanced PWM rejection | Active circuitry suppressing dv/dt-induced transients - enables stable current measurement during MOSFET/IGBT switching without added RC filtering. |
| Zero-drift amplifier architecture | Chopped topology delivering ±625 µA/°C input offset drift - ensures <0.1% gain error drift over full –40°C to +125°C operating range. |
| High common-mode rejection | DC CMRR >120 dB and 90 dB at 50 kHz - rejects noise from noisy 48-V bus or motor phase voltages while preserving signal integrity. |
| Thermally robust packaging | HTSSOP-24 with exposed thermal pad and RθJA = 19.4°C/W - sustains ±50 A continuous current at +85°C ambient with standard 2-oz copper planes. |
Applications
| 48-V Motor Control | DC/DC Converters |
|---|---|
Use Scenario: Real-time phase current monitoring in BLDC or PMSM drives powered from 48-V battery buses. IC Role / Device Role / Timing Role: High-side bidirectional current sensor feeding closed-loop FOC control and overcurrent protection logic. Use Value: Enables precise torque regulation and fault response within 2 µs, leveraging 350-kHz bandwidth and enhanced PWM rejection to ignore gate-drive transients. | Use Scenario: Input/output current sensing in isolated or non-isolated buck, boost, and LLC converters operating up to 80-V bus. IC Role / Device Role / Timing Role: Primary-side current monitor for peak-current-mode control and secondary-side output current verification. Use Value: Delivers 0.5% system gain accuracy across temperature, reducing need for calibration in production test and improving efficiency mapping fidelity. |
| Medical Cordless Tools | Solenoid & Actuator Control |
Use Scenario: Battery current monitoring and motor stall detection in handheld surgical or dental tools with Li-ion packs. IC Role / Device Role / Timing Role: Bidirectional shunt monitor interfacing with MCU ADC for state-of-charge estimation and dynamic load profiling. Use Value: Maintains ±62.5 mA input offset current spec across –40°C to +85°C, ensuring consistent trigger thresholds for safety-critical stall detection. | Use Scenario: Precision current feedback in industrial pneumatic/hydraulic valve drivers and linear actuators. IC Role / Device Role / Timing Role: Low-drift current sensor providing real-time coil current data to PID controllers for position/force regulation. Use Value: 10 ppm/°C shunt TCR and zero-drift amplifier minimize thermal drift-induced position error in closed-loop actuation systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20 mV/A gain, AEC-Q100 qualified, no integrated shunt - requires external 400-µΩ resistor; higher input offset drift (±1.5 µV/°C referred to input). | Automotive-grade use only; lacks integrated Kelvin shunt, increasing layout complexity and thermal mismatch risk. | Select when automotive qualification is mandatory and board space allows external shunt placement with strict Kelvin routing. |
| INA253A1IPW | Same 20 mV/A gain and HTSSOP-24 package, but integrates 2-mΩ shunt (not 400-µΩ); lower current rating (±20 A continuous). | Optimized for lower-current, higher-gain applications where 2-mΩ shunt improves SNR but limits max current. | Choose for cost-sensitive designs needing identical footprint and gain but operating below ±20 A - avoids redesign while sacrificing high-current capability. |
Compared with INA254A1IPWAR, INA240A1QDRQ1 requires external precision shunt layout and offers inferior thermal stability, while INA253A1IPW shares pinout and gain but trades 75-A capability for higher gain sensitivity at lower current ranges - making INA254A1IPWAR uniquely suited for high-power, high-accuracy 48-V industrial systems.
Availability
INA254A1IPWAR is available at Aetrix Electronics and suitable for 48-V motor controls, DC/DC converters, and solenoid/actuator systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA254A1IPWAR 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 amplifiers and current-sensing solutions.
The INA254 product line was designed specifically for high-accuracy, high-voltage bidirectional current sensing in industrial motor drives, power supplies, and automated equipment - integrating shunt and amplifier to eliminate system-level calibration and thermal drift errors.
FAQ
What is the maximum continuous current rating for INA254A1IPWAR at 85°C ambient?
The INA254A1IPWAR supports ±50 A continuous current at an ambient temperature of –40°C to +85°C. This rating is validated under standard conditions: no forced airflow, 2-oz copper input power planes, and proper thermal pad soldering. At +125°C ambient, derating applies - continuous current drops to ±30 A to maintain junction temperature ≤150°C. The device's 1-mΩ total package resistance and 19.4°C/W thermal resistance define these limits, and the integrated 400-µΩ shunt contributes only 40% of that resistance.
Does INA254A1IPWAR require external components for basic operation?
No, INA254A1IPWAR operates with minimal external components: only a 0.1-µF bypass capacitor on VS and optional RC filters on REF1/REF2 for noise suppression. Its integrated 400-µΩ Kelvin shunt eliminates the need for external current-sense resistors, and its zero-drift amplifier requires no external trimming. Unlike discrete solutions, INA254A1IPWAR does not need external gain-setting resistors, offset nulling circuits, or dv/dt filtering networks due to its built-in PWM rejection and matched shunt-amplifier calibration.
How does the enhanced PWM rejection in INA254A1IPWAR improve measurement accuracy?
The enhanced PWM rejection in INA254A1IPWAR actively suppresses large common-mode dv/dt transients - such as those generated by 100-kHz IGBT/MOSFET switching - before they corrupt the differential signal path. This is achieved through internal high-frequency CMRR optimization and dedicated transient cancellation circuitry, delivering 90 dB AC CMRR at 50 kHz. As a result, INA254A1IPWAR maintains stable output during rapid bus voltage transitions, eliminating the need for external RC snubbers or digital post-processing, and enabling clean current waveforms for FOC algorithms without added latency or distortion.
Can INA254A1IPWAR be used for unidirectional current sensing?
Yes, INA254A1IPWAR supports unidirectional sensing by connecting REF2 to GND and REF1 to a fixed bias voltage (e.g., 1.65 V for 3.3-V supply), setting the output zero point at a defined voltage rather than mid-supply. In this configuration, the output voltage scales linearly from that offset (e.g., 0 V to 3.3 V) as current flows in one direction only. The device's 20 mV/A gain, rail-to-rail output swing, and 0.5% system gain error remain fully applicable, and no hardware changes are needed - only reference pin wiring and software interpretation differ from bidirectional mode.
What is the role of the RES pin on INA254A1IPWAR, and how must it be connected?
The RES pin (pin 15) on INA254A1IPWAR is a reserved function pin that must be connected to GND per the official Texas Instruments datasheet (SLOS974A, section 6.1). Leaving it floating or connecting it to VS may cause undefined behavior or degraded performance. This connection ensures internal biasing stability and guarantees specified operation of the zero-drift amplifier and PWM rejection circuitry. All functional validation of INA254A1IPWAR - including gain accuracy, CMRR, and thermal derating - assumes RES is properly tied to GND.
INA254A1IPWAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 24-SOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 2.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 350 kHz
- Current - Input Bias:
- 90 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 1.8mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HTSSOP
INA254A1IPWAR FAQ
1.How can I place an order for INA254A1IPWAR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA254A1IPWAR 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 INA254A1IPWAR reliable?
The price and inventory of INA254A1IPWAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA254A1IPWAR is usually 5 days.
3.What payment methods are accepted for INA254A1IPWAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA254A1IPWAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA254A1IPWAR?
INA254A1IPWAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA254A1IPWAR 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 INA254A1IPWAR?
For technical support, including INA254A1IPWAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA254A1IPWAR requirements.
6.How does Aetrix verify that INA254A1IPWAR is sourced from the original manufacturer or authorized distributors?
All INA254A1IPWAR 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 INA254A1IPWAR meets industry standards.
7.What is the process for return or replacement of INA254A1IPWAR?
All INA254A1IPWAR units undergo pre-shipment inspection (PSI). If there is an issue with INA254A1IPWAR, 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 INA254A1IPWAR part is unused and in its original packaging.
Return procedure for INA254A1IPWAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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