INA2181A3QDGSRQ1 - 26V Dual-Channel Current Sense Amp | TI
MPN: INA2181A3QDGSRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.46 | $0.46 |
| 10 | $0.42 | $4.20 |
| 100 | $0.34 | $34.00 |
| 500 | $0.28 | $140.00 |
| 1,000 | $0.23 | $230.00 |
Drop-in alternatives for INA2181A3QDGSRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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View Datasheet →INA2181A3QDGSRQ1 Maximum Ratings & Electrical Characteristics
| Channels | 2 (dual channel) |
| Gain (A3 option) | 100 V/V |
| Common-Mode Voltage Range | -0.2 V to +26 V |
| Bandwidth | 350 kHz |
| Sensing Type | Bidirectional, low-side and high-side |
| Output Type | Voltage output (rail-to-rail) |
| Automotive Qualification | AEC-Q100 qualified (Q1) |
| Operating Temperature | -40C to +125C |
| Package | VSSOP (DGS), 10 pins |
| Mounting Type | Surface Mount |
| Reference Pins | REF1 and REF2 for bidirectional offset |
INA2181A3QDGSRQ1 vssop (dgs), 10 pins Pin Configuration Guide
Complete pinout information for INA2181A3QDGSRQ1 (vssop (dgs), 10 pins package) with REF1 and REF2 for bidirectional offset pins. This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for INA2181A3QDGSRQ1.
Refer to the datasheet for full pin configuration.
Estimated pin count: REF1 and REF2 for bidirectional offset pins (analog package)
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
INA2181A3QDGSRQ1 is suitable for 6 applications: Automotive 12V Rail Current Monitoring, Battery Charge/Discharge Gauging, Motor Drive DC-Bus and Phase Current Sensing, Server and Telecom Power-Supply Supervision, Industrial 24V PLC I/O Current Monitoring, ADAS Sensor Module Power Monitoring.
Automotive 12V Rail Current Monitoring
The INA2181A3QDGSRQ1 fits automotive battery-rail monitoring because its -0.2 V to +26 V common-mode range fully covers 12 V battery lines (including overvoltage transients up to 26 V) independent of the amplifier supply, and its AEC-Q100 Q1 qualification with -40C to +125C rating satisfies automotive environmental requirements. The dual channels allow one device to monitor both the battery feed and a secondary load switch rail, halving BOM count versus two single-channel parts. The 100 V/V gain works well with 1 mOhm to 2 mOhm shunts, giving 100 mV to 200 mV per 1 A while keeping shunt dissipation low. Placed on the high side with REF1/REF2 biased at mid-scale, the outputs report both charge and discharge current to the body controller's ADC.
Recommended
Battery Charge/Discharge Gauging
Bidirectional sensing is essential for battery systems where current flows into the pack during charging and out during discharge. The INA2181A3QDGSRQ1 supports this with dedicated REF1 and REF2 pins: biasing each at mid-scale lets each channel's rail-to-rail output swing up or down depending on current direction, at 100 mV per ampere with a 1 mOhm shunt and 100 V/V gain. The 350 kHz bandwidth also captures transient charge events that coulomb counters can miss, and the -0.2 V common-mode floor tolerates slightly-negative bus conditions. In 12 V or 24 V backup and telecom battery systems, one dual-channel device monitors pack current plus a charger rail simultaneously, and the Q1 grade suits vehicle-mounted energy storage modules.
Recommended
Motor Drive DC-Bus and Phase Current Sensing
In servo and BLDC drives, the INA2181A3QDGSRQ1 can monitor the DC bus current on the high side while a second channel watches a brake-chopper or auxiliary rail, using the 26 V common-mode limit for 12 V and 24 V bus systems. The 350 kHz bandwidth and fast voltage-output settling give the MCU enough reaction time for overcurrent protection events, while the 100 V/V gain allows low-value shunts (0.5 mOhm to 2 mOhm) that limit insertion losses in multi-ampere drives. Because it is a voltage-output (non-integrating) topology, no external compensation network is needed. Note that this family is best for bus-side and low-side sensing; in-line phase sensing at PWM common-mode steps requires verifying transient recovery behavior.
Recommended
Server and Telecom Power-Supply Supervision
Data-center and telecom boards pack many power rails that must be individually monitored for load trending and fault detection. The INA2181A3QDGSRQ1's dual channels let one VSSOP-10 device supervise two rails, and the -0.2 V to +26 V common-mode range covers 12 V intermediate bus and 24 V telecom applications directly regardless of the chip's own supply. With a 2 mOhm shunt, the 100 V/V gain yields 200 mV/A, comfortably matching a 3.3 V ADC input for 0 A to 15 A ranges. Rail-to-rail voltage outputs connect directly to hot-swap controller or FPGA supervisory ADC inputs without extra scaling, and the cost-optimized INAx181 architecture makes per-rail monitoring economical at high channel counts.
Recommended
Industrial 24V PLC I/O Current Monitoring
Programmable-logic-controller I/O cards often must report per-channel load current for predictive maintenance and fault isolation. The INA2181A3QDGSRQ1 monitors two output channels per device with its dual 100 V/V channels and rail-to-rail outputs; a 1 Ohm-range selection with 100 mOhm shunt gives 10 mV per 100 mA of actuator current, resolvable by standard 12-bit ADCs. The common-mode range covers the industrial 24 V bus with margin up to 26 V, and industrial-grade siblings (INA2181A3IDGSR) allow cost reduction where AEC-Q100 is not required. The -40C to +125C specification covers unconditioned cabinet environments, and the tiny VSSOP-10 footprint fits dense I/O termination boards.
Recommended
ADAS Sensor Module Power Monitoring
Camera, radar, and lidar modules in ADAS platforms require per-module current telemetry for functional-safety diagnostics and load balancing across vehicle networks. The INA2181A3QDGSRQ1's AEC-Q100 qualification and -40C to +125C range meet automotive module requirements, while its dual channels monitor, for example, a sensor's main supply and its illumination or transmitter sub-rail from one package. The 100 V/V gain with a 2 mOhm shunt yields 200 mV/A, so a module drawing 0.5 A produces a clean 100 mV signal above noise floor. The 350 kHz bandwidth catches power-mode transients as sensors switch between standby and active states, supporting energy-management firmware in the domain controller.
Recommended
Recommended Products Summary
Engineering reference data for INA2181A3QDGSRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA2181A2QDGSRQ1 | INA2181A4QDGSRQ1 | INA2181A1QDGSRQ1 | INA2181A3IDGSR | INA2181A2IDGSR |
|---|---|---|---|---|---|---|
| Package | VSSOP-10 (DGS) | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gain | 100 V/V (A3) | 50 V/V (A2) | 200 V/V (A4) | 20 V/V (A1) | 100 V/V (A3) | 50 V/V (A2) |
| Common-Mode Range | -0.2 V to +26 V | -0.2 V to +26 V | -0.2 V to +26 V | -0.2 V to +26 V | -0.2 V to +26 V | -0.2 V to +26 V |
| Bandwidth | 350 kHz (class) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Automotive Grade | Yes (AEC-Q100 Q1) | Yes (AEC-Q100 Q1) | Yes (AEC-Q100 Q1) | Yes (AEC-Q100 Q1) | No (industrial) | No (industrial) |
| Temperature Range | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Unit Price (1 pc) | $0.46 (as of 2026-09-03) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Dual channel integration halves BOM count (vs INA181A3QDGKTQ1)
- Automotive Q1 grade at cost-optimized pricing (vs INA2181A3IDGSR)
- Gain scaling flexibility within the same footprint (vs INA2181A2QDGSRQ1)
Design Notes
Do not exceed the 26 V common-mode limit on the IN+ / IN- pins. In automotive 12 V systems, load-dump and jump-start events can push battery lines beyond 26 V; add a series resistor plus transient suppressor at the sense inputs, or clamp the rail upstream. Also remember the common-mode range is independent of VS: the amplifier can read a 26 V rail even when powered at 3.3 V, but output swing is still bounded by VS, so size the gain and shunt so maximum current keeps the output below the VS headroom limit.
Route the shunt as a low-inductance 2-wire (Kelvin) connection: take the IN+ and IN- traces directly from the shunt pads, not from shared current-carrying copper, or PCB trace milliohms will corrupt the measurement. Keep the sense traces short and pair them differentially to reject switching-noise pickup. Place 100 nF of bypassing at the VS pin close to the device. On a 4-layer board, the VSSOP-10 thermal pad-free footprint needs no special thermal copper, as power dissipation in the amplifier is in the milliwatt range.
Drive REF1 and REF2 from a low-impedance source. A passive resistor divider connected directly to the REF pin shifts the output because the divider impedance interacts with the internal gain-set network; buffer the divider with an op-amp (for example a low-cost general-purpose amplifier) or use a dedicated reference IC. For bidirectional measurement, mid-scale biasing of a 3.3 V ADC range gives roughly +/-1.65 V of swing, so with 100 V/V gain and a 1 mOhm shunt the usable range is about +/-16.5 A before output clipping.
Compliance Information
AEC-Q100 qualification confirmed from TI product data (Q1 suffix). RoHS/REACH/lead-free status not stated in provided web data - confirm on the TI product page.
