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Texas Instruments INA240A3PW
- Part No.:
- INA240A3PW
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA240A3PW.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:599
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Product details
Overview
INA240A3PW from Texas Instruments is a bidirectional, ultra-precise current sense amplifier with 100 V/V fixed gain, –4 V to 80 V common-mode input range, 0.20% max gain error, ±25 μV max input offset voltage, and enhanced PWM rejection for motor and solenoid control systems.
For engineers reviewing the INA240A3PW datasheet, INA240A3PW pinout, INA240A3PW application, or INA240A3PW equivalent, this page delivers verified specifications, TSSOP-8 pin mapping, real-world use cases in bidirectional current sensing, and validated alternative options for industrial power management designs.
Technical Context
The INA240A3PW employs a zero-drift architecture enabling accurate low-side and high-side current measurement down to 10-mV full-scale shunt drops, with DC CMRR of 132 dB and AC CMRR of 93 dB at 50 kHz. Its enhanced PWM rejection suppresses large ΔV/Δt transients without requiring external filtering.
Operating from a single 2.7-V to 5.5-V supply and drawing ≤2.4 mA quiescent current, it supports unidirectional or bidirectional operation via configurable REF1/REF2 pins, and delivers 400-kHz bandwidth with 2 V/μs slew rate for fast overcurrent detection in switching systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100 V/V - sets output scaling for 10-mV shunt drop → 1-V output; enables use of lower-value, lower-power shunt resistors. |
| Common-Mode Range | –4 V to 80 V - supports sensing below ground (e.g., solenoid flyback) and high-voltage bus monitoring up to 80 V. |
| Gain Error | ±0.20% max - ensures <2 mV absolute error at 1-V output; critical for closed-loop current regulation accuracy. |
| Input Offset Voltage | ±25 μV max - allows accurate measurement of sub-amp currents with 100-mΩ shunts (e.g., 250 mA → 25 μV). |
| DC CMRR | 132 dB - rejects low-frequency noise from shared ground paths; maintains accuracy in noisy industrial environments. |
| AC CMRR @ 50 kHz | 93 dB - suppresses PWM switching noise in motor drives without signal distortion or recovery ripple. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with standard 3.3-V and 5-V logic rails; eliminates need for auxiliary supplies. |
Pinout & Package
INA240A3PW is housed in an 8-pin TSSOP package (3.00 mm × 4.40 mm), optimized for thermal performance and PCB space efficiency in motor control and power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NC | No internal connection | Must be left floating or tied to GND; no functional impact on amplification or PWM rejection. |
| 2 - IN+ | Non-inverting input | Connect to supply side of shunt; polarity determines output direction in bidirectional configurations. |
| 3 - IN– | Inverting input | Connect to load side of shunt; differential voltage (IN+ – IN–) defines sensed current magnitude and sign. |
| 4 - GND | Analog ground reference | Return path for internal circuitry; must be low-impedance and separated from power ground where possible. |
| 5 - VS | Positive supply rail | Accepts 2.7–5.5 V; requires local 100-nF ceramic decoupling capacitor placed within 2 mm of pin. |
| 6 - REF2 | Reference input | Paired with REF1 to set output midpoint; both pins share identical internal gain network and biasing. |
| 7 - REF1 | Reference input | Configures unidirectional (GND or VS referenced) or bidirectional (mid-supply or external reference) output swing. |
| 8 - OUT | Voltage output | Delivers amplified, buffered output; swing is VS – 0.2 V to GND + 10 mV (RL = 10 kΩ); drives ADC inputs directly. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | Suppresses large ΔV/Δt transients (e.g., MOSFET switching edges) before amplification, eliminating output ringing and recovery delays seen in standard current amps. |
| Zero-drift architecture | Maintains ±25 μV offset and 250 nV/°C drift across –40°C to +125°C, enabling stable calibration over temperature in automotive and industrial enclosures. |
| Bidirectional sensing capability | Output polarity reverses with current direction when REF1/REF2 are biased at mid-supply, supporting regenerative braking and H-bridge current monitoring. |
| Wide common-mode range (–4 V to 80 V) | Enables direct sensing on high-side switches and negative-rail solenoids without level-shifting circuits or isolated amplifiers. |
| Low quiescent current (2.4 mA max) | Reduces self-heating in densely packed power stages and extends battery life in portable motorized equipment. |
Applications
| Motor Control Systems | Solenoid & Valve Actuation |
|---|---|
|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC motor drives using PWM-modulated gate drivers. IC Role / Device Role / Timing Role: Current sense amplifier providing isolated, high-bandwidth feedback to MCU ADC for field-oriented control (FOC) loops. Use Value: 400-kHz bandwidth and 93-dB AC CMRR at 50 kHz ensure clean current waveforms during PWM dead-time, improving torque ripple and efficiency. |
Use Scenario: Closed-loop current regulation in industrial pneumatic valves with rapid on/off cycling and flyback voltage spikes. IC Role / Device Role / Timing Role: Bidirectional current monitor capturing both energization and de-energization phases, including negative flyback periods. Use Value: –4 V common-mode capability allows direct sensing during flyback without clamping diodes or additional protection circuitry. |
| Telecom Power Management | Actuator Position Control |
|
Use Scenario: Input/output current supervision in 48-V intermediate bus converters feeding server PSUs and baseband units. IC Role / Device Role / Timing Role: High-side current sensor interfacing with PMBus-compliant digital controllers for overcurrent fault detection and telemetry. Use Value: 80-V common-mode rating and 0.20% gain error support precise power budgeting and dynamic load step response validation. |
Use Scenario: Precision current feedback in servo-driven linear actuators used in medical imaging gantries and robotic joints. IC Role / Device Role / Timing Role: Low-drift amplifier delivering stable analog current feedback to PID controllers under varying ambient temperatures. Use Value: ±25 μV offset and 250 nV/°C drift enable <0.5% full-scale error over –40°C to +125°C, meeting IEC 60601 safety margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3D | Same electrical specs; SOIC-8 package (4.90 mm × 3.91 mm), higher RθJA (113.5°C/W vs. 149.1°C/W), no NC pin - pin 1 is IN– instead of NC. | Better thermal dissipation in low-airflow environments; larger footprint limits high-density PCB layouts. | Select INA240A3D for legacy SOIC footprints or improved thermal margin; choose INA240A3PW for space-constrained motor control boards. |
| INA229AIDGST | Digital output (I²C), 16-bit resolution, integrated shunt and temp sensor; 0.1% gain error but only 27-V common-mode range and no enhanced PWM rejection. | Replaces analog signal chain with digital telemetry; lacks transient immunity needed in PWM-heavy motor drives. | Choose INA229AIDGST for energy metering or low-noise DC systems; INA240A3PW remains preferred for PWM-rich industrial motion control. |
Compared with INA240A3D and INA229AIDGST, the INA240A3PW uniquely combines TSSOP-8 compactness, –4 V to 80 V sensing, and hardware-level PWM transient suppression-making it the only option that satisfies simultaneous requirements for size, voltage range, and switching noise immunity in next-gen motor inverters.
Availability
INA240A3PW is available at Aetrix Electronics and suitable for motor controls, solenoid actuation, and telecom power management requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.
Supply support for INA240A3PW 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 power management ICs.
The INA240 product line was designed specifically for high-accuracy, high-noise-immunity current sensing in industrial motor drives, solenoid controls, and power conversion systems operating across extended temperature ranges.
FAQ
What is the maximum common-mode voltage the INA240A3PW can handle?
The INA240A3PW supports a common-mode input voltage range of –4 V to 80 V. This allows it to accurately sense current on high-side switches up to 80 V and accommodate negative flyback voltages down to –4 V, such as those generated by inductive solenoid loads during turn-off. The specification is guaranteed across the full –40°C to +125°C operating temperature range.
Does the INA240A3PW require external components for stable operation?
Yes - the INA240A3PW requires a 100-nF ceramic decoupling capacitor placed within 2 mm of the VS pin to ensure stability under PWM transients. No external compensation is needed for unity-gain stability, but layout best practices (short traces, ground plane under device, separation of analog/digital grounds) are essential to maintain 132-dB DC CMRR and 93-dB AC CMRR at 50 kHz.
Can the INA240A3PW measure bidirectional current, and how is it configured?
Yes - the INA240A3PW supports bidirectional current sensing by biasing both REF1 and REF2 pins to a common reference voltage (e.g., VS/2). When the differential input (IN+ – IN–) is positive, the output rises above the reference; when negative, it falls below. This configuration enables accurate monitoring of regenerative current in H-bridge motor drivers and reversible actuators without changing hardware.
What is the purpose of the NC pin on the INA240A3PW TSSOP package?
Pin 1 on the INA240A3PW (TSSOP-8) is labeled NC (No Connection) and has no internal connection. It may be left floating or tied to GND for mechanical stability or ESD mitigation - neither choice affects electrical performance, gain accuracy, offset, or PWM rejection. This differs from the SOIC-8 variant (INA240A3D), where pin 1 is IN–.
How does the enhanced PWM rejection in the INA240A3PW improve system-level accuracy?
The enhanced PWM rejection in the INA240A3PW actively suppresses large common-mode transients (ΔV/Δt) before amplification, reducing output recovery ripple and settling delay. In motor drive applications, this means current waveforms remain clean and monotonic during PWM edge transitions - enabling reliable overcurrent detection within 10 µs and eliminating false trips in safety-critical protection circuits that rely on the INA240A3PW output.
INA240A3PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 400 kHz
- Current - Input Bias:
- 90 µA
- Voltage - Input Offset:
- 5 µV
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
INA240A3PW FAQ
1.How can I place an order for INA240A3PW through Aetrix?
Please submit a Request for Quotation (RFQ) for INA240A3PW 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 INA240A3PW reliable?
The price and inventory of INA240A3PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA240A3PW is usually 5 days.
3.What payment methods are accepted for INA240A3PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA240A3PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA240A3PW?
INA240A3PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA240A3PW 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 INA240A3PW?
For technical support, including INA240A3PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA240A3PW requirements.
6.How does Aetrix verify that INA240A3PW is sourced from the original manufacturer or authorized distributors?
All INA240A3PW 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 INA240A3PW meets industry standards.
7.What is the process for return or replacement of INA240A3PW?
All INA240A3PW units undergo pre-shipment inspection (PSI). If there is an issue with INA240A3PW, 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 INA240A3PW part is unused and in its original packaging.
Return procedure for INA240A3PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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