INA181A1QDBVRQ1 - 26V AEC-Q100 Bidirectional Current Sense Amp | TI
Teilenummer: INA181A1QDBVRQ1 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $0.95 | $0,95 |
| 10 | $0.85 | $8,50 |
| 100 | $0.72 | $72,00 |
| 500 | $0.62 | $310,00 |
| 1.000 | $0.54 | $540,00 |
| 3.000 | $0.46 | $1.380,00 |
INA181A1QDBVRQ1 Übersicht
A current-sense amplifier is an analog IC that measures voltage drop across a shunt resistor placed in series with a load, producing a ground-referenced output proportional to load current. Current-sense amplifiers sit in the broader hierarchy of signal-chain ICs -> amplifiers -> instrumentation amplifiers -> current-sense amplifiers, and they are essential building blocks of any power-management system that requires accurate real-time current telemetry for protection, regulation, or efficiency optimization.
Key features include bidirectional sensing (single part supports both charge and discharge current on battery rails), 350 kHz bandwidth for fast transient response, rail-to-rail output swing for maximum dynamic range with low supply headroom, and AEC-Q100 Grade 1 qualification with an operating temperature range of -40C to +125C for under-hood automotive deployment. The device integrates a precision thin-film gain resistor network that eliminates external gain-setting components.
Internally, the INA181A1QDBVRQ1 uses a chopped-input bipolar front-end with delta-sigma offset correction, achieving 100 uV maximum offset and 1 uV/C typical drift. This architecture rejects 50/60 Hz line-coupled noise and PSRR-induced errors from upstream switching converters, enabling accurate measurement on noisy automotive buses such as 12V battery feeds.
Typical applications include automotive body electronics (lighting load monitoring, seat heater current sense), USB Type-C VBUS current monitoring, motor drive H-bridge phase current feedback, battery management systems for e-bikes and power tools, and solar MPPT input-side current sensing. The wide common-mode range handles inductive load transients and load-dump pulses found in 12V/24V automotive systems.
When designing with this device, ensure the input pins remain within the absolute maximum ratings even during transients; a small differential RC filter between the shunt and the IN+/IN- pins limits input-stage overdrive. Use a 4-layer PCB with a low-impedance ground pour to avoid ground bounce corrupting the high-side measurement.
This page synthesizes distributor pricing, drop-in SOT-23-6 alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in-Alternativen für INA181A1QDBVRQ1 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
INA181A2QDBVRQ1
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
INA181A3QDBVRQ1
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
INA181A4QDBVRQ1
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
INA181A1IDBVR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX9940TASA+T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
INA181A1QDBVRQ1 Grenzwerte & elektrische Eigenschaften
| Amplifier Type | Current Sense |
| Number of Circuits | 1 |
| Gain (A1 variant) | 20 V/V |
| Common-Mode Input Range | -0.2 V to +26 V |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Quiescent Current (Iq) | 195 uA (typical) |
| Bandwidth (BW) | 350 kHz (gain = 20) |
| Output Swing | Rail-to-Rail |
| Betriebstemperaturbereich | -40 C to +125 C |
| Gehäuse | SOT-23-6 (DBV) |
| Pin-Anzahl | 6 |
| Montageart | Surface Mount |
| AEC-Q100 Grade | Grade 1 qualified |
| RoHS-Status | Compliant |
INA181A1QDBVRQ1 Pin-Konfiguration
| Pin 1 | IN+ — Positive (high-side) input to current-sense amplifier |
| Pin 2 | IN- — Negative (low-side) input to current-sense amplifier |
| Pin 3 | GND — Ground |
| Pin 4 | OUT — Output voltage (proportional to differential input) |
| Pin 5 | REF — Reference voltage input for bidirectional zero-current output |
| Pin 6 | VS+ — Positive supply (2.7V to 5.5V) |
Typische Anwendungen
INA181A1QDBVRQ1 ist geeignet für 6 Anwendungs: Automotive Body Electronics Load Monitoring, USB Type-C VBUS Current Monitoring, Motor Drive H-Bridge Phase Current Feedback, Battery Management System Current Sense, Solar MPPT Input Current Sensing, Industrial 24V Bus Current Monitoring.
Automotive Body Electronics Load Monitoring
Monitors current draw of automotive body loads such as headlamp LED drivers, seat heaters, and power window motors on 12V battery rails. The INA181A1QDBVRQ1's -0.2V to +26V common-mode range handles cold-crank and load-dump transients on the 12V bus, while AEC-Q100 Grade 1 qualification (-40C to +125C) ensures reliability in under-hood environments. The 20 V/V gain and 350 kHz bandwidth enable accurate PWM load current telemetry at switching frequencies up to 100 kHz. Place the shunt on the high side of the load to detect shorts to ground, and use a 100 ohm differential RC filter on IN+/IN- to reject RF noise from adjacent ECUs.
Empfohlen
USB Type-C VBUS Current Monitoring
Measures VBUS current on USB Type-C and USB-PD ports to enforce source-side current limiting and detect cable faults. The INA181A1QDBVRQ1's bidirectional capability captures both sourcing and sinking current (charging role swap), and the rail-to-rail output maximizes dynamic range on a 3.3V or 5V system rail. With 350 kHz bandwidth, the part tracks USB-PD current-step transients within microseconds, supporting Fast Role Swap and BC1.2 detection schemes. Use a 10 mOhm shunt for 3A monitoring or 5 mOhm for 5A, scaling within the A1 gain of 20 V/V to keep output in the linear range.
Empfohlen
Motor Drive H-Bridge Phase Current Feedback
Provides isolated-free phase current feedback in brushed-DC and stepper motor H-bridge drives. The INA181A1QDBVRQ1's wide common-mode range supports high-side sensing directly on the motor supply rail (up to 26V), while the 350 kHz bandwidth captures PWM switching edges for torque-ripple analysis. AEC-Q100 qualification makes it suitable for automotive motor loads such as electric power steering pumps and HVAC blowers. A typical implementation places a 10 mOhm shunt in the high-side leg of each phase; the bidirectional output drives an MCU ADC for field-oriented control loops.
Empfohlen
Battery Management System Current Sense
Monitors charge and discharge current in e-bike, power tool, and 12V/24V battery packs. The INA181A1QDBVRQ1's bidirectional sensing eliminates the need for two unidirectional amplifiers to capture both charge and discharge current on a single shunt, simplifying BMS layout and reducing BOM cost. The -0.2V common-mode tolerance allows low-side sensing below ground, while 100 uV offset enables accurate coulomb counting at low discharge currents. A 1-2 mOhm shunt provides full-scale current measurement from 10A to 100A depending on pack voltage.
Empfohlen
Solar MPPT Input Current Sensing
Measures input-side current in solar MPPT charge controllers where the photovoltaic source floats above ground. The INA181A1QDBVRQ1's 26V common-mode range handles 24V panel strings, and bidirectional capability captures reverse-current events during battery discharge. The 350 kHz bandwidth and low Iq (195 uA) preserve MPPT tracking accuracy while minimizing parasitic load on the panel - critical for low-light harvesting. Use a 5-10 mOhm shunt on the high side of the panel return, with REF biased to mid-supply for ground-referenced ADC conversion.
Empfohlen
Industrial 24V Bus Current Monitoring
Monitors load current on industrial 24V PLC and factory-automation bus rails. The INA181A1QDBVRQ1's 26V common-mode range is a direct fit for 24V nominal supplies with transient peaks up to 36V (clamped). The rail-to-rail output and 5V supply enable direct interface to 3.3V or 5V ADCs without level translation. Use this part in PLC digital output modules, sensor power distribution, and actuator driver stages where accurate load-current feedback enables predictive maintenance and fault detection.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für INA181A1QDBVRQ1 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | INA181A2QDBVRQ1 | INA181A3QDBVRQ1 | INA181A4QDBVRQ1 | INA181A1IDBVR | MAX9940TASA+T |
|---|---|---|---|---|---|---|
| Package | SOT-23-6 (DBV) | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Bandwidth | 350 kHz | 150 kHz | 105 kHz | 75 kHz | 350 kHz | ~150 kHz |
| AEC-Q100 Qualified | Yes (Grade 1) | Yes (Grade 1) | Yes (Grade 1) | Yes (Grade 1) | No | No |
| Direction | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional |
Wichtigste Unterscheidungsmerkmale
- Bidirectional sensing eliminates need for two unidirectional amplifiers (vs. INA180A1QDBVRQ1 (unidirectional))
- AEC-Q100 Grade 1 qualified for under-hood automotive deployment (vs. INA181A1IDBVR (commercial/industrial only))
- Highest bandwidth in the INAx181-Q1 family at A1 gain (vs. INA181A2QDBVRQ1 (150 kHz), INA181A3QDBVRQ1 (105 kHz), INA181A4QDBVRQ1 (75 kHz))
Designhinweise
Use a 4-layer PCB with a continuous low-impedance ground plane directly under the INA181A1QDBVRQ1. Route IN+ and IN- as a tightly coupled differential pair from the shunt to the IC, keeping the pair length under 10 mm to minimize loop area and reject common-mode noise. Place a 100 ohm resistor in series with each input pin near the IC to dampen input-stage resonances when driving long traces.
Do not exceed the -0.2V to +26V absolute maximum common-mode voltage on IN+ or IN- even during transients; add a TVS diode (such as SMAJ26CA) from IN+ to GND if the bus can spike above 26V. Also, the REF pin sets the bidirectional zero-current output - bias it to mid-supply (VS+/2) for split-rail applications or to GND for unidirectional translation, but never leave it floating.
Estimated: at 350 kHz bandwidth with a 1 nF output load, the INA181A1QDBVRQ1's output impedance rises above 50 ohm - place a 10 ohm series resistor at OUT if driving long cables or high-capacitance ADC inputs to maintain stability. Add a 1 nF to 10 nF ceramic capacitor close to OUT for additional capacitive load isolation.
Compliance-Informationen
AEC-Q100 Grade 1 qualified per TI INAx181-Q1 datasheet. RoHS and REACH compliant. Lead-free and halogen-free per TI product page environmental disclosures.
