My Inquiry
My Account
Texas Instruments INA240A2PW
- Part No.:
- INA240A2PW
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA240A2PW.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,074
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
INA240A2PW from Texas Instruments is a bidirectional, ultra-precise current sense amplifier with 50 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/solenoid control systems.
For engineers reviewing the INA240A2PW datasheet, INA240A2PW pinout, INA240A2PW application, or INA240A2PW equivalent, this page delivers verified specifications, TSSOP-8 pin mapping, real-world use cases in high-dV/dt environments, and validated alternative options for precision shunt-based current monitoring.
Technical Context
The INA240A2PW implements a zero-drift architecture with differential input stage optimized for high AC CMRR (93 dB at 50 kHz) and DC CMRR (132 dB), enabling accurate sensing during fast common-mode transients typical in PWM-driven solenoids and motor phases. Its reference-pin configurable output supports unidirectional or bidirectional operation without external op-amps.
It operates from a single 2.7–5.5 V supply, draws ≤2.4 mA quiescent current, and delivers 400 kHz bandwidth with 2 V/µs slew rate - sufficient for overcurrent detection in industrial power stages while maintaining <0.01% non-linearity across –40°C to +125°C.
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 during flyback in solenoid drivers and high-side switching in 48-V industrial buses. |
| DC CMRR | 132 dB - rejects slow-varying noise (e.g., thermal drift, supply ripple) to maintain sub-μV-level offset stability over temperature. |
| AC CMRR @ 50 kHz | 93 dB - suppresses PWM-edge-induced transients, reducing output recovery ripple and enabling clean current reconstruction in 20-kHz motor drives. |
| Input Offset Voltage | ±25 μV max - ensures ≤0.5% error at 50-mV full-scale sense voltage; critical for low-current accuracy in pressure regulator feedback loops. |
| Quiescent Current | 2.4 mA max - allows integration into always-on subsystems (e.g., telecom power management) without excessive standby power penalty. |
| Bandwidth | 400 kHz - supports fast overcurrent response (<10 µs settling) for IGBT/MOSFET protection in servo amplifiers. |
Pinout & Package
INA240A2PW is housed in an 8-pin TSSOP package (3.00 mm × 4.40 mm), thermally optimized for PCB heat dissipation with RθJA = 149.1°C/W. Pin functions are validated per TI SBOS662C Rev C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NC | No internal connection | Must be left floating or tied to GND; no signal routing or decoupling function. |
| 2 - IN+ | Positive analog input | Connects to supply side of shunt; polarity determines output direction in bidirectional mode. |
| 3 - IN– | Negative analog input | Connects to load side of shunt; differential pair with IN+ senses Vsense = VIN+ – VIN–. |
| 4 - GND | Analog ground reference | Primary return path for internal circuitry; must tie to low-impedance system ground plane. |
| 5 - VS | Power supply input | Accepts 2.7–5.5 V; requires local 0.1-µF ceramic decoupling capacitor placed within 2 mm. |
| 6 - REF2 | Reference voltage input | Configures output midpoint; paired with REF1 to set bias (e.g., 0 V, VS/2, or external reference). |
| 7 - REF1 | Reference voltage input | Identical function to REF2; both pins must be connected to same potential for stable mid-rail output. |
| 8 - OUT | Voltage-output terminal | Delivers amplified VOUT = 50 × (VIN+ – VIN–) + VREF; drives ADC inputs or comparator thresholds directly. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | Reduces output disturbance from ΔV/Δt >10 V/ns common-mode edges - eliminates need for external RC filtering in 20-kHz motor gate-drive circuits. |
| Bidirectional current sensing | Output swings symmetrically around user-defined reference (e.g., VS/2), enabling true ±10-A measurement with single 5-V supply and no level-shifting. |
| Zero-drift architecture | Maintains ±250 nV/°C max offset drift - ensures stable calibration over industrial temperature range without periodic auto-zero cycles. |
| Wide common-mode range | Operates down to –4 V, supporting high-side sensing in buck converters and negative-rail solenoid flyback recovery without level translators. |
| Fixed 50 V/V gain | Optimizes signal-to-noise ratio for 20–100-mV shunt drops; avoids gain-setting resistor errors and layout sensitivity of programmable amplifiers. |
Applications
| Motor Controls | Solenoid and Valve Controls |
|---|---|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC motor drives using high-side shunts and 20-kHz PWM gate signals. IC Role / Device Role / Timing Role: Current sense amplifier providing isolated, low-latency analog feedback to MCU ADC for field-oriented control (FOC) loop closure. Use Value: 93-dB AC CMRR at 50 kHz suppresses PWM-edge artifacts, enabling accurate current reconstruction without digital post-filtering delay. |
Use Scenario: Closed-loop current regulation in automotive fuel injectors and industrial pneumatic valves with rapid on/off switching. IC Role / Device Role / Timing Role: Bidirectional shunt monitor capturing both energizing and flyback currents during valve actuation cycles. Use Value: –4 V common-mode capability accommodates negative flyback voltage, eliminating need for clamping diodes or auxiliary supplies. |
| Power Management | Telecom Equipment |
Use Scenario: Input/output current supervision in 48-V intermediate bus converters for server PSUs and industrial PLCs. IC Role / Device Role / Timing Role: High-side current sensor feeding protection logic and telemetry to PMBus-compliant digital controllers. Use Value: 0.20% max gain error ensures ±0.1-A accuracy at 50-A full scale, meeting IPC-9592 Class 2 current monitoring requirements. |
Use Scenario: Load current monitoring in distributed telecom base station power modules with strict 500-ms fault-clearing deadlines. IC Role / Device Role / Timing Role: Fast-settling (9.6 µs to 0.5%) current amplifier triggering hardware overcurrent shutdown before MOSFET failure. Use Value: 400 kHz bandwidth and 2 V/µs slew rate guarantee sub-10-µs response to short-circuit events under 48-V bus conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2D | Same electrical specs; SOIC-8 package (4.90 mm × 3.91 mm), higher RθJA (113.5°C/W), no exposed thermal pad. | Better suited for through-hole prototyping or legacy SOIC footprints; lower thermal performance limits continuous 2.4-mA operation in compact enclosures. | Select INA240A2D only when board layout mandates SOIC compatibility or reflow constraints prohibit TSSOP. |
| INA282AIDR | 20 V/V gain, 120-dB DC CMRR, ±120-μV offset, no enhanced PWM rejection; SOIC-8. | Lacks 50-kHz AC CMRR and transient suppression - requires external filtering in PWM environments, increasing BOM and layout complexity. | Choose INA282AIDR only for DC or low-frequency (<1 kHz) current sensing where cost is prioritized over PWM robustness. |
Compared with INA240A2D and INA282AIDR, the INA240A2PW delivers superior thermal efficiency in surface-mount designs and unique PWM-edge immunity essential for motor/solenoid control - making it the only option that meets both precision and high-dV/dt requirements without external compensation.
Availability
INA240A2PW 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 support, and guaranteed traceable sourcing.
Supply support for INA240A2PW 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 INA240 product line was designed specifically for high-accuracy, high-noise-immunity current sensing in industrial motor drives, solenoid actuators, and telecom power systems - emphasizing robustness in PWM-rich environments.
FAQ
What is the maximum common-mode voltage the INA240A2PW can handle?
The INA240A2PW supports a common-mode input voltage range of –4 V to 80 V, enabling operation below ground during solenoid flyback and compatibility with 48-V and 60-V industrial bus systems. This specification is guaranteed over the full –40°C to +125°C operating temperature range and is independent of the 2.7–5.5 V supply voltage.
Does the INA240A2PW require external components for basic operation?
No, the INA240A2PW operates autonomously with only a local 0.1-µF ceramic decoupling capacitor on the VS pin. Its fixed 50 V/V gain, zero-drift core, and reference-pin configuration eliminate the need for external resistors, capacitors, or trimming networks - simplifying layout and improving long-term stability compared to discrete op-amp solutions.
How does the enhanced PWM rejection in the INA240A2PW improve system performance?
The enhanced PWM rejection in the INA240A2PW reduces output disturbance from large common-mode transients (ΔV/Δt) generated by PWM switching, delivering clean current waveforms without post-processing. In motor drive applications, this eliminates 10–20 µs of recovery ripple seen in standard amplifiers, enabling faster and more accurate FOC loop execution and reducing torque ripple.
Can the INA240A2PW measure bidirectional current with a single 5-V supply?
Yes, the INA240A2PW supports true bidirectional current sensing with a single 5-V supply by connecting REF1 and REF2 to 2.5 V (e.g., via resistor divider or precision reference). The output then centers at 2.5 V and swings ±2.5 V for ±50-mV differential input, enabling full-scale ±1-A measurement with a 50-mΩ shunt - all without dual supplies or level shifters.
What is the thermal performance difference between INA240A2PW and INA240A2D?
The INA240A2PW (TSSOP-8) has a junction-to-ambient thermal resistance (RθJA) of 149.1°C/W, while the INA240A2D (SOIC-8) is rated at 113.5°C/W. Although the SOIC package exhibits lower RθJA, the TSSOP's smaller footprint and thinner profile enable better heat spreading in dense layouts - making the INA240A2PW preferable for thermally constrained SMT designs despite its higher nominal RθJA.
INA240A2PW 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
INA240A2PW FAQ
1.How can I place an order for INA240A2PW through Aetrix?
Please submit a Request for Quotation (RFQ) for INA240A2PW 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 INA240A2PW reliable?
The price and inventory of INA240A2PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA240A2PW is usually 5 days.
3.What payment methods are accepted for INA240A2PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA240A2PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA240A2PW?
INA240A2PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA240A2PW 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 INA240A2PW?
For technical support, including INA240A2PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA240A2PW requirements.
6.How does Aetrix verify that INA240A2PW is sourced from the original manufacturer or authorized distributors?
All INA240A2PW 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 INA240A2PW meets industry standards.
7.What is the process for return or replacement of INA240A2PW?
All INA240A2PW units undergo pre-shipment inspection (PSI). If there is an issue with INA240A2PW, 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 INA240A2PW part is unused and in its original packaging.
Return procedure for INA240A2PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA240A2PW Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
