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Texas Instruments INA2181A3QDGSRQ1
- Part No.:
- INA2181A3QDGSRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA2181A3QDGSRQ1.pdf
- Description:
- IC CURR SENSE 2 CIRCUIT 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,461
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Product details
Overview
INA2181A3QDGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive dual-channel bidirectional current-sense amplifier with 100V/V fixed gain, –0.2V to 26V common-mode input range, ±500µV max offset at 12V VCM, and 150kHz small-signal bandwidth - used for precision motor phase current monitoring and battery pack cell balancing in EV powertrain control units.
For engineers reviewing the INA2181A3QDGSRQ1 datasheet, INA2181A3QDGSRQ1 pinout, INA2181A3QDGSRQ1 application, or INA2181A3QDGSRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade specifications, and real-world design implications - not generic marketing claims.
Technical Context
The INA2181A3QDGSRQ1 integrates matched thin-film gain resistors for 100V/V fixed gain, enabling ±1% max gain error and <20 ppm/°C gain drift over –40°C to +125°C. Its proprietary topology supports high-side sensing at bus voltages up to 26V while powered from a 2.7–5.5V supply, decoupling measurement range from supply constraints.
Each channel features independent REF pins for bidirectional output offset control, rail-to-rail output swing (within 30mV of VS and 5mV of GND), and 2V/µs slew rate - allowing accurate reconstruction of fast transient currents in PWM-driven motor phases without distortion or saturation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V fixed - enables 10mV sense voltage to produce 1V output, simplifying ADC interface and improving SNR vs lower-gain variants. |
| Common-mode range | –0.2V to 26V - supports direct high-side sensing on 12V/24V/48V automotive buses without level-shifting or isolation. |
| Offset voltage | ±500µV max at VCM = 12V - ensures ≤0.5% error at 50mV full-scale sense voltage, critical for low-current fault detection. |
| Bandwidth | 150kHz - captures 3rd harmonic of 50kHz PWM switching, enabling real-time current loop control in BLDC inverters. |
| Quiescent current | 500µA max - allows dual-channel sensing in always-on battery monitoring circuits with minimal standby drain. |
| Output swing | Within 30mV of VS and 5mV of GND - preserves dynamic range for 12-bit ADCs operating at 3.3V or 5V reference. |
| CMRR | 84dB min - rejects bus noise during high-dv/dt transients (e.g., IGBT turn-off), maintaining accuracy in noisy power domains. |
Pinout & Package
The INA2181A3QDGSRQ1 is housed in a 10-pin VSSOP package (DGS), 3.0mm × 4.9mm footprint, optimized for thermal dissipation in high-power automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 | Analog output (Channel 1) | 100×(IN+1 − IN−1) + REF1 - provides rail-to-rail voltage proportional to sensed current direction and magnitude. |
| OUT2 | Analog output (Channel 2) | 100×(IN+2 − IN−2) + REF2 - enables simultaneous dual-phase current monitoring without multiplexing delay. |
| IN−1, IN−2 | Negative input (per channel) | Connect to load side of shunt for high-side sensing; to ground side for low-side - defines current polarity reference. |
| IN+1, IN+2 | Positive input (per channel) | Connect to bus-voltage side of shunt for high-side; to load side for low-side - completes differential sense path. |
| REF1, REF2 | Reference input (per channel) | Bias point for bidirectional output: 0V → unidirectional; VS/2 → ± full-scale output swing around mid-supply. |
| GND | Analog ground | Return path for internal bias networks and output stage - must be connected to low-impedance analog ground plane. |
| VS | Power supply | 2.7–5.5V single supply - powers both channels; bypass with 0.1µF ceramic capacitor placed within 2mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Independent REF pins per channel enable true ± current measurement with single-ended output - eliminates need for external op-amps or dual supplies. |
| AEC-Q100 Grade 1 | Qualified for –40°C to +125°C ambient operation with HBM ±3kV / CDM ±1kV ESD - meets automotive module-level reliability requirements without derating. |
| Matched gain network | On-chip thin-film resistors ensure <0.1% inter-channel gain mismatch - critical for torque-balancing algorithms in dual-motor systems. |
| Rail-to-rail output | Output swings to within 30mV of VS and 5mV of GND - maximizes usable ADC code count and avoids clipping during peak current events. |
| Functional safety support | Documentation available for ISO 26262 ASIL-B system integration - includes FIT rate, failure mode analysis, and diagnostic coverage guidance. |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current feedback in 3-phase inverter driving traction motor in hybrid electric vehicle. IC Role / Device Role / Timing Role: Dual-channel high-side current sensing on two motor phases with synchronized sampling via shared REF bias. Use Value: 150kHz bandwidth captures PWM harmonics for field-oriented control; ±500µV offset enables <1A fault detection at 10mΩ shunt. | Use Scenario: Cell-level current monitoring in 12S Li-ion battery pack for state-of-charge and imbalance detection. IC Role / Device Role / Timing Role: Low-side bidirectional sensing on individual cell strings using REF = 1.65V to center output for ±20A range. Use Value: 100V/V gain resolves 10mA changes at 100mΩ shunt; 500µA quiescent current minimizes self-discharge in sleep mode. |
| Power Management | Lighting Control |
Use Scenario: Input current supervision in 48V DC-DC converter supplying ADAS domain controller. IC Role / Device Role / Timing Role: High-side sensing on primary-side MOSFET source with VCM = 48V and VS = 3.3V supply. Use Value: –0.2V to 26V common-mode range accommodates 48V bus via internal level-shifting; no external components needed. | Use Scenario: LED string current regulation in adaptive front-lighting system (AFS) with PWM dimming. IC Role / Device Role / Timing Role: Low-side sensing on LED return path with REF = 0V for unidirectional 0–5A measurement. Use Value: 2V/µs slew rate tracks 20kHz PWM edges without droop; rail-to-rail output interfaces directly to MCU ADC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3QDRQ1 | Higher bandwidth (400kHz), wider VCM (–4V to 80V), but higher quiescent current (1.1mA) | Better suited for 48V/72V industrial inverters requiring faster response; less optimal for battery-constrained modules | Select when >200kHz bandwidth or >26V VCM is required; avoid if <600µA total supply budget is critical |
| MAX40056ATA+T | Single-channel, 100V/V gain, 200kHz BW, ±150µV max offset at 12V, but not AEC-Q100 qualified | Valid for non-automotive industrial motor drives; lacks automotive qualification documentation and temperature grade | Consider only for commercial-grade designs; not suitable for ASIL-relevant subsystems |
Compared with INA240A3QDRQ1 and MAX40056ATA+T, the INA2181A3QDGSRQ1 uniquely balances AEC-Q100 Grade 1 compliance, dual-channel integration, and 150kHz bandwidth within 500µA supply - making it optimal for space-constrained, thermally demanding automotive body and powertrain modules where channel count and qualification outweigh raw speed or ultra-low offset.
Availability
INA2181A3QDGSRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, and lighting control applications requiring stable component supply across automotive production lifecycles.
Supply support for INA2181A3QDGSRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive-grade signal conditioning and power management ICs.
The INA2181-Q1 product line delivers cost-optimized, AEC-Q100-qualified bidirectional current sensing for automotive subsystems where dual-channel integration, wide common-mode range, and functional safety support are mandatory.
FAQ
What is the maximum common-mode voltage supported by the INA2181A3QDGSRQ1?
The INA2181A3QDGSRQ1 supports a common-mode input voltage range of –0.2V to 26V. This allows direct high-side sensing on 12V and 24V automotive buses without external level-shifting circuitry. The specification is guaranteed across the full operating temperature range of –40°C to +125°C and is independent of the 2.7–5.5V supply voltage.
Does the INA2181A3QDGSRQ1 require external gain-setting resistors?
No, the INA2181A3QDGSRQ1 does not require external gain-setting resistors. It integrates a factory-trimmed, matched thin-film resistor network for fixed 100V/V gain. This eliminates gain error drift due to external resistor tolerance and temperature coefficients, ensuring ±1% max gain error over temperature and time - a key advantage over discrete op-amp-based solutions.
How is bidirectional current sensing implemented in the INA2181A3QDGSRQ1?
Bidirectional current sensing in the INA2181A3QDGSRQ1 is implemented via independent REF1 and REF2 pins. Applying a reference voltage (e.g., VS/2 = 2.5V) centers the output: positive differential input produces OUT > REF; negative differential input produces OUT < REF. This enables true ± current measurement with a single-ended output, eliminating need for dual supplies or external summing amplifiers.
What is the typical quiescent current consumption of the INA2181A3QDGSRQ1?
The INA2181A3QDGSRQ1 has a maximum quiescent current of 500µA at TA = –40°C to +125°C. Typical consumption is 356µA at 25°C with VSENSE = 0mV. This low power draw supports always-on battery monitoring and other energy-sensitive automotive subsystems without compromising measurement performance.
Is the INA2181A3QDGSRQ1 pin-compatible with other devices in the INAx181-Q1 family?
Yes, the INA2181A3QDGSRQ1 shares identical 10-pin VSSOP (DGS) pinout with all INA2181-Q1 variants (A1/A2/A4), including same pin functions for OUT1/OUT2, IN±1/IN±2, REF1/REF2, GND, and VS. Gain selection is internal and fixed per part number - no pin strapping or configuration required. This enables drop-in replacement across gain options within the same package.
INA2181A3QDGSRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 150 kHz
- -3db Bandwidth:
- 150 kHz
- Current - Input Bias:
- 75 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 356µA
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSSOP
INA2181A3QDGSRQ1 FAQ
1.How can I place an order for INA2181A3QDGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2181A3QDGSRQ1 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 INA2181A3QDGSRQ1 reliable?
The price and inventory of INA2181A3QDGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2181A3QDGSRQ1 is usually 5 days.
3.What payment methods are accepted for INA2181A3QDGSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2181A3QDGSRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2181A3QDGSRQ1?
INA2181A3QDGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2181A3QDGSRQ1 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 INA2181A3QDGSRQ1?
For technical support, including INA2181A3QDGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2181A3QDGSRQ1 requirements.
6.How does Aetrix verify that INA2181A3QDGSRQ1 is sourced from the original manufacturer or authorized distributors?
All INA2181A3QDGSRQ1 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 INA2181A3QDGSRQ1 meets industry standards.
7.What is the process for return or replacement of INA2181A3QDGSRQ1?
All INA2181A3QDGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA2181A3QDGSRQ1, 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 INA2181A3QDGSRQ1 part is unused and in its original packaging.
Return procedure for INA2181A3QDGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA2181A3QDGSRQ1 Tags
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