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Texas Instruments INA240A2D
- Part No.:
- INA240A2D
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA240A2D.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:15,767
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Product details
Overview
INA240A2D from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-noise PWM environments. It features 50 V/V fixed gain, –4 V to 80 V common-mode input range, ±25 μV max offset voltage, 132-dB DC CMRR, and 2.4 mA max quiescent current - enabling accurate shunt-based current measurement in motor drives and solenoid controls.
For engineers reviewing the INA240A2D datasheet, INA240A2D pinout, INA240A2D application, or INA240A2D equivalent, this page delivers verified technical context, package-specific pin functions, real-world use-value per application, and two confirmed alternative parts with documented functional and selection differences.
Technical Context
The INA240A2D employs a zero-drift architecture with enhanced PWM rejection circuitry that suppresses large ΔV/Δt transients (e.g., during MOSFET switching), delivering stable output even under 50-kHz AC common-mode interference. Its dual-reference-pin interface (REF1/REF2) supports configurable unidirectional or bidirectional output midpoints without external components.
It operates from a single 2.7–5.5-V supply and maintains precision across –40°C to +125°C. The device's 400-kHz bandwidth and 2-V/μs slew rate support fast overcurrent detection, while its 93-dB AC CMRR at 50 kHz ensures fidelity in high-frequency switching systems like BLDC motor controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50 V/V - sets full-scale output to 2.5 V for 50-mV shunt drop; enables use of low-value shunts (e.g., 1.5 mΩ at 10 A) to minimize power loss. |
| Common-Mode Range | –4 V to 80 V - supports sensing below ground (e.g., flyback in solenoids) and high-side monitoring in 48-V industrial buses. |
| Offset Voltage | ±25 μV max - ensures ≤0.5% error at 50-mV full-scale input; critical for low-current accuracy in actuator feedback loops. |
| DC CMRR | 132 dB - rejects low-frequency noise (e.g., supply ripple, thermal drift) to maintain sub-μV-level baseline stability. |
| Quiescent Current | 2.4 mA max - allows integration into always-on power management subsystems without compromising system efficiency. |
| Bandwidth | 400 kHz - captures rapid current transients (e.g., short-circuit events) with <10-μs settling time for protection response. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive, industrial motor control, and telecom power shelf environments. |
Pinout & Package
INA240A2D is available in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm), optimized for thermal performance (RθJA = 113.5°C/W) and PCB layout simplicity in high-density power stages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input | Connects to supply side of shunt; polarity determines output direction in bidirectional mode. |
| IN– | Analog input | Connects to load side of shunt; differential input pair enables high common-mode rejection. |
| REF1 / REF2 | Analog reference inputs | Set output midpoint: tied to GND for unidirectional ground-referenced output, or to VS/2 for bidirectional operation. |
| OUT | Analog output | Voltage-output stage drives ADC input or comparator; rail-to-rail swing (GND + 1 mV to VS – 0.2 V) maximizes dynamic range. |
| VS | Power supply | 2.7–5.5 V single supply; decoupling capacitor required near pin for PWM noise immunity. |
| GND | Analog ground | Low-impedance return path; must be separated from power ground in mixed-signal layouts. |
| NC | No internal connection | Pin 4 in SOIC package - leave floating or tie to GND per layout best practice; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | Suppresses >50-kHz common-mode transients without external filtering - eliminates output ringing in motor gate-drive feedback paths. |
| Zero-drift architecture | Maintains ±250 nV/°C offset drift - ensures stable calibration over temperature in closed-loop pressure regulators. |
| Bidirectional sensing capability | Configurable via REF1/REF2 pins - enables regenerative braking current monitoring in EV inverters without polarity-switching circuitry. |
| Wide common-mode range | Operates down to –4 V - accommodates negative flyback voltages in solenoid drivers without clamping diodes or level shifters. |
| High AC CMRR at 50 kHz | 93 dB - preserves signal integrity when placed adjacent to noisy half-bridge power stages in telecom rectifiers. |
Applications
| Motor Controls | Solenoid and Valve Controls |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC motor drives using high-side shunts. IC Role / Device Role / Timing Role: Current sense amplifier providing isolated, low-latency analog feedback to MCU ADC for field-oriented control (FOC). Use Value: 400-kHz bandwidth and 2-V/μs slew rate enable detection of sub-10-μs overcurrent events; 50-V/V gain matches typical 3.3-V ADC full-scale range. |
Use Scenario: Monitoring coil current in industrial pneumatic valves with rapid on/off cycling. IC Role / Device Role / Timing Role: Bidirectional current monitor capturing both energizing and flyback (–4 V) phases without signal inversion. Use Value: –4 V to 80 V common-mode range eliminates need for external level-shifting; ±25 μV offset ensures <1% error at 50-mA hold current. |
| Power Management | Telecom Equipment |
Use Scenario: Input/output current monitoring in 48-V intermediate bus converters for server PSUs. IC Role / Device Role / Timing Role: High-side current sense amplifier feeding digital power controller for load-line regulation and fault logging. Use Value: 132-dB DC CMRR rejects 48-V bus ripple; 2.4 mA quiescent current minimizes standby loss in always-on telemetry circuits. |
Use Scenario: Load current supervision in -48 V telecom rectifier modules with hot-swap capability. IC Role / Device Role / Timing Role: Precision current sensor interfacing to isolated ADC for remote monitoring and OCP triggering. Use Value: SOIC package meets IPC-7351 density requirements; 93-dB AC CMRR at 50 kHz prevents false trips during burst-mode switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2PW | Same electrical specs; 8-pin TSSOP (3.00 mm × 4.40 mm) with RθJA = 149.1°C/W - higher thermal resistance than SOIC. | Better suited for space-constrained PCBs where thermal margin allows; less robust for convection-cooled industrial enclosures. | Select INA240A2PW only when board area is critical and ambient temperature remains ≤85°C. |
| INA282AIDR | 20-V/V gain, ±120-μV offset, 100-dB DC CMRR, 2.7–20-V supply - wider supply range but lower precision and no enhanced PWM rejection. | Acceptable for non-PWM linear power supplies or low-speed actuators where transient immunity is not required. | Choose INA282AIDR only if cost sensitivity outweighs need for flyback tolerance and 50-kHz noise rejection in motor/solenoid systems. |
Compared with INA240A2PW, the INA240A2D offers superior thermal performance in enclosed industrial environments; compared with INA282AIDR, it delivers 32-dB higher DC CMRR and validated PWM transient suppression - making it the only option for reliable current sensing in high-dV/dt motor drive feedback loops.
Availability
INA240A2D is available at Aetrix Electronics and suitable for motor controls, solenoid and valve controls, and power management applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEM programs.
Supply support for INA240A2D 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 current sensing in noisy, high-dV/dt environments such as motor drives, solenoid controls, and industrial power systems - emphasizing PWM rejection, wide common-mode range, and zero-drift stability.
FAQ
What is the maximum common-mode voltage the INA240A2D can handle?
The INA240A2D supports a common-mode input voltage range of –4 V to 80 V. This allows operation below ground (e.g., during solenoid flyback) and high-side sensing in 48-V or 60-V industrial buses. The specification is guaranteed over the full –40°C to +125°C temperature range and applies directly to the IN+ and IN– pins of the INA240A2D.
Does the INA240A2D require external components for basic operation?
No, the INA240A2D operates autonomously with only a supply decoupling capacitor on the VS pin. Its fixed 50 V/V gain, zero-drift core, and integrated reference divider eliminate the need for external gain-setting resistors or trimming components - simplifying layout and improving long-term stability for the INA240A2D.
Can the INA240A2D measure bidirectional current, and how is it configured?
Yes, the INA240A2D supports true bidirectional current sensing. Configure it by applying equal voltages to REF1 and REF2 - typically VS/2 - to set the output midpoint. When IN+ > IN–, output rises above midpoint; when IN+ < IN–, output falls below. This configuration is explicitly validated for the INA240A2D in TI's SBOS662C datasheet Section 8.4.3.
What is the purpose of the NC pin on the INA240A2D SOIC package?
Pin 4 in the INA240A2D SOIC (D) package is labeled NC (No Connection) and has no internal bond wire or circuit function. Per TI's datasheet revision history and Pin Functions table, it may be left floating or tied to GND for mechanical stability - but it must never be driven or used as a signal path, as it provides no electrical functionality for the INA240A2D.
How does the INA240A2D's enhanced PWM rejection improve system reliability?
The INA240A2D's enhanced PWM rejection suppresses large common-mode transients (ΔV/Δt) generated during MOSFET switching, reducing output ringing and recovery time. In motor control applications, this prevents false overcurrent triggers and enables clean, jitter-free current waveforms for FOC algorithms - directly improving torque accuracy and inverter reliability for the INA240A2D.
INA240A2D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SOIC
INA240A2D FAQ
1.How can I place an order for INA240A2D through Aetrix?
Please submit a Request for Quotation (RFQ) for INA240A2D 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 INA240A2D reliable?
The price and inventory of INA240A2D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA240A2D is usually 5 days.
3.What payment methods are accepted for INA240A2D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA240A2D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA240A2D?
INA240A2D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA240A2D 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 INA240A2D?
For technical support, including INA240A2D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA240A2D requirements.
6.How does Aetrix verify that INA240A2D is sourced from the original manufacturer or authorized distributors?
All INA240A2D 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 INA240A2D meets industry standards.
7.What is the process for return or replacement of INA240A2D?
All INA240A2D units undergo pre-shipment inspection (PSI). If there is an issue with INA240A2D, 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 INA240A2D part is unused and in its original packaging.
Return procedure for INA240A2D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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