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Texas Instruments INA4181A2QPWRQ1
- Part No.:
- INA4181A2QPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA4181A2QPWRQ1.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,430
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Product details
Overview
INA4181A2QPWRQ1 from Texas Instruments is a quad-channel, AEC-Q100 Grade 1 automotive current-sense amplifier with bidirectional sensing capability, 50V/V fixed gain, –0.2V to 26V common-mode input range, ±500µV max offset at 12V VCM, and 210kHz small-signal bandwidth - used in high-accuracy motor control and battery monitoring systems.
For engineers reviewing the INA4181A2QPWRQ1 datasheet, INA4181A2QPWRQ1 pinout, INA4181A2QPWRQ1 application, or INA4181A2QPWRQ1 equivalent, this page delivers verified technical context, validated pin functions for TSSOP-20, confirmed automotive-grade specifications (–40°C to 125°C), and real-world selection guidance against functional alternatives.
Technical Context
The INA4181A2QPWRQ1 implements a precision current-shunt monitor architecture with integrated matched resistor gain network (50V/V), enabling accurate bidirectional current measurement independent of supply voltage. Its input stage supports common-mode voltages up to 26V while operating from 2.7V–5.5V supply, making it suitable for both high-side and low-side configurations without level-shifting circuitry.
Each of its four channels features independent REF pins for output offset control, rail-to-rail output swing (within 30mV of VS and 5mV of GND), and 2V/µs slew rate - enabling fast transient response in motor phase current feedback and overcurrent fault detection loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Quad-channel - enables simultaneous monitoring of four independent current paths (e.g., 3-phase motor + DC link) |
| Gain | 50V/V fixed - provides 50× amplification of shunt voltage; eliminates external gain-setting resistors and associated drift |
| Common-mode range | –0.2V to 26V - supports direct connection to 12V/24V automotive bus rails without attenuation or isolation |
| Offset voltage | ±500µV max at VCM = 12V - ensures ≤10mA error when using 50mΩ shunt at 1A full-scale |
| Bandwidth | 210kHz - captures fast current transients in PWM-driven motors (e.g., <5µs rise time) |
| Quiescent current | 900µA max - enables always-on monitoring in battery-powered ECUs without excessive drain |
| Accuracy | ±1% max gain error - guarantees consistent scaling across temperature (–40°C to 125°C) and unit-to-unit variation |
Pinout & Package
The INA4181A2QPWRQ1 is housed in a 20-pin TSSOP package (PW), measuring 6.50mm × 6.40mm, with exposed thermal pad for enhanced power dissipation in automotive under-hood environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+1 to IN+4 | Analog input (positive) | Connect to bus-voltage side of respective sense resistor in high-side config; load side in low-side config |
| IN–1 to IN–4 | Analog input (negative) | Connect to load side of respective sense resistor in high-side config; ground side in low-side config |
| OUT1 to OUT4 | Analog output | Amplified, bidirectional output (VREF ± G·VSENSE); rail-to-rail capable (GND +5mV to VS –30mV) |
| REF1 to REF4 | Analog reference input | Set DC output bias (0V to VS); enables zero-current output at mid-supply for bidirectional sensing |
| VS | Power supply | 2.7V–5.5V single supply; powers all four channels and internal gain network |
| GND | Analog ground | Reference for all inputs/outputs; must be low-impedance path to minimize noise coupling between channels |
| NC (pins 10, 11) | No connect | Internally unconnected; may be left floating or tied to GND/VS per layout best practices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Enables precise measurement of forward/reverse current flow (e.g., regenerative braking) via REF pin biasing |
| AEC-Q100 Grade 1 | Qualified for –40°C to +125°C ambient operation - meets automotive engine bay and transmission control requirements |
| Integrated 50V/V gain | Matched on-die resistor network minimizes gain error (±1%) and reduces temperature drift (≤20ppm/°C) |
| Rail-to-rail output | Output swings within 5mV of GND and 30mV of VS - maximizes dynamic range for ADC interfacing with 12-bit+ resolution |
| Channel separation | ≥110dB at 10kHz - prevents crosstalk between motor phases or battery cell monitors in shared PCB layouts |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC motor drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Quad-channel current-shunt monitor providing synchronized, low-latency analog outputs for each motor leg and DC bus. Use Value: 210kHz bandwidth and 2V/µs slew rate enable accurate capture of PWM-edge current spikes; ±500µV offset ensures <1% error at 10A with 50mΩ shunt. | Use Scenario: Cell-level current monitoring in 12S lithium-ion battery packs for state-of-charge (SoC) and state-of-health (SoH) estimation. IC Role / Device Role / Timing Role: Simultaneous bidirectional current measurement across multiple parallel strings or charge/discharge paths. Use Value: –0.2V to 26V common-mode range allows direct connection to high-side FETs; 50V/V gain optimizes signal-to-noise ratio for µA–100A ranges. |
| Power Management | Lighting Control |
Use Scenario: Input/output current supervision in automotive DC-DC converters and power distribution units (PDUs). IC Role / Device Role / Timing Role: High-side current monitor on primary and secondary rails to detect overcurrent, short-circuit, and load dump events. Use Value: 26V absolute max common-mode withstands load-dump transients; ±1% gain error ensures reliable trip-point consistency across temperature. | Use Scenario: LED string current regulation and fault detection in adaptive front-lighting systems (AFS) and rear lighting modules. IC Role / Device Role / Timing Role: Low-side current sensing for individual LED channels to maintain luminance uniformity and detect open/short faults. Use Value: Quad configuration supports up to four independent LED drivers; rail-to-rail output interfaces directly with 3.3V microcontroller ADCs without external level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA4181A1QPWRQ1 | 20V/V gain (vs. 50V/V); same quad-channel, TSSOP-20, AEC-Q100 Grade 1 | Better suited for higher-current, lower-shunt applications (e.g., 100mΩ+ shunts) where output swing headroom is critical | Select when full-scale shunt voltage exceeds 100mV and system gain budget allows lower amplification |
| INA4181A3QPWRQ1 | 100V/V gain (vs. 50V/V); identical package, temperature grade, and bandwidth (150kHz) | Optimized for ultra-low-current sensing (e.g., <1A) with sub-25mΩ shunts; reduced bandwidth acceptable for slower battery monitoring | Select when maximizing sensitivity for µA–500mA ranges outweighs need for highest bandwidth |
Compared with INA4181A1QPWRQ1 and INA4181A3QPWRQ1, the INA4181A2QPWRQ1 offers balanced gain (50V/V), bandwidth (210kHz), and offset performance - making it the optimal choice for mid-range current sensing (1A–50A) requiring both speed and precision in automotive motor and power systems.
Availability
INA4181A2QPWRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, and automotive power management applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for INA4181A2QPWRQ1 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 deep expertise in automotive-grade signal conditioning and power management ICs.
The INAx181-Q1 family was designed specifically for cost-optimized, high-reliability automotive current sensing - delivering precision, wide common-mode range, and AEC-Q100 qualification in compact packages for ECU, battery, and lighting subsystems.
FAQ
What is the maximum common-mode voltage supported by the INA4181A2QPWRQ1?
The INA4181A2QPWRQ1 supports a common-mode input voltage range of –0.2V to 26V. This allows direct connection to 12V and 24V automotive bus rails without external attenuation or level-shifting circuitry. The specification is guaranteed across the full operating temperature range (–40°C to 125°C) and is independent of the 2.7V–5.5V supply voltage applied to the VS pin.
Does the INA4181A2QPWRQ1 require external gain-setting resistors?
No, the INA4181A2QPWRQ1 does not require external gain-setting resistors. It integrates a factory-trimmed, matched resistor network that provides a precise 50V/V fixed gain. This eliminates gain-setting errors due to resistor tolerance, temperature drift, and layout parasitics - ensuring ±1% maximum gain error over temperature and unit-to-unit variation.
How does the INA4181A2QPWRQ1 enable bidirectional current sensing?
The INA4181A2QPWRQ1 enables bidirectional current sensing through its dedicated REF pins (REF1–REF4). Applying a DC bias voltage (e.g., VS/2) to a REF pin centers the output around that voltage: positive differential input produces output > VREF; negative differential input produces output < VREF. This allows a single-supply system to measure both charging and discharging currents accurately - essential for battery monitoring and regenerative braking applications.
What is the bandwidth and slew rate of the INA4181A2QPWRQ1?
The INA4181A2QPWRQ1 has a small-signal bandwidth of 210kHz and a large-signal slew rate of 2V/µs. These specifications are measured under standard conditions (CLOAD = 10pF, TA = 25°C) and remain functional across the full –40°C to 125°C temperature range. The combination supports accurate capture of fast current transients in motor control and fault detection circuits.
Is the INA4181A2QPWRQ1 pin-compatible with other variants in the INAx181-Q1 family?
Yes, the INA4181A2QPWRQ1 is pin-compatible with all other INA4181xQPWRQ1 variants (A1, A3, A4) in the TSSOP-20 (PW) package. Pin assignments for IN+, IN–, OUT, REF, VS, GND, and NC are identical across gain options. This allows design reuse and gain optimization without PCB layout changes - provided the system's bandwidth and offset requirements align with the selected variant.
INA4181A2QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 350 kHz
- -3db Bandwidth:
- 350 kHz
- Current - Input Bias:
- 75 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- -
- Current - Output / Channel:
- 8 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
INA4181A2QPWRQ1 FAQ
1.How can I place an order for INA4181A2QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA4181A2QPWRQ1 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 INA4181A2QPWRQ1 reliable?
The price and inventory of INA4181A2QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA4181A2QPWRQ1 is usually 5 days.
3.What payment methods are accepted for INA4181A2QPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA4181A2QPWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA4181A2QPWRQ1?
INA4181A2QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA4181A2QPWRQ1 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 INA4181A2QPWRQ1?
For technical support, including INA4181A2QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA4181A2QPWRQ1 requirements.
6.How does Aetrix verify that INA4181A2QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All INA4181A2QPWRQ1 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 INA4181A2QPWRQ1 meets industry standards.
7.What is the process for return or replacement of INA4181A2QPWRQ1?
All INA4181A2QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA4181A2QPWRQ1, 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 INA4181A2QPWRQ1 part is unused and in its original packaging.
Return procedure for INA4181A2QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA4181A2QPWRQ1 Tags
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