INA2181A2QDGSRQ1 - AEC-Q100 26V Dual Current Sense Amp | TI
MPN: INA2181A2QDGSRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.99 | $0.99 |
| 10 | $0.89 | $8.90 |
| 100 | $0.72 | $72.00 |
| 500 | $0.61 | $305.00 |
| 1,000 | $0.52 | $520.00 |
Drop-in alternatives for INA2181A2QDGSRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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View Datasheet →INA2181A2QDGSRQ1 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Gain (A2 option) | 50 V/V |
| Common-Mode Voltage Range | -0.2 V to +26 V |
| Bandwidth | 350 kHz |
| Input Type | Bidirectional, voltage output |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Supply Voltage (nominal) | 3.3 V / 5 V |
| Output Type | Rail-to-rail analog voltage |
| Reference Pin | External, one per channel (bidirectional sensing) |
| Operating Temperature Range | -40C to +125C |
| Qualification | AEC-Q100 |
| Package | VSSOP-10 (DGS), 3.00 mm width |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Application | Low-side / high-side current sensing |
INA2181A2QDGSRQ1 Pin Configuration
| Pin 1 | INB+ — Channel B shunt input, positive sense |
| Pin 2 | INB- — Channel B shunt input, negative sense |
| Pin 3 | GND — Ground reference |
| Pin 4 | REFB — Channel B reference input for bidirectional offset |
| Pin 5 | OUTB — Channel B analog voltage output |
| Pin 6 | OUTA — Channel A analog voltage output |
| Pin 7 | REFA — Channel A reference input for bidirectional offset |
| Pin 8 | VS — Power supply, 2.7 V to 5.5 V |
| Pin 9 | INA- — Channel A shunt input, negative sense |
| Pin 10 | INA+ — Channel A shunt input, positive sense |
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
INA2181A2QDGSRQ1 is suitable for 6 applications: Automotive Battery Current Monitoring, 48V Telecom and Server Power Monitoring, Motor Drive Phase and Rail Current Sense, Industrial 24V Rail Power Telemetry, Battery-Powered Portable and IoT Devices, Networking and Base Station Power Distribution.
Automotive Battery Current Monitoring
The INA2181A2QDGSRQ1 is purpose-built for automotive battery current monitoring because it is AEC-Q100 qualified for -40C to +125C and senses shunt drops at common-mode voltages from -0.2 V to +26 V independent of its 2.7 V to 5.5 V supply. Its 50 V/V gain converts millivolt-level shunt signals from low-resistance shunts into a ground-referenced output that feeds a microcontroller ADC directly. The dual channels let one device monitor charge and discharge paths or battery and DC-DC rails, reducing BOM count. Its 350 kHz bandwidth also supports fast overcurrent fault detection, while the bidirectional reference pin allows outputs centered at mid-scale for sign detection.
Recommended
48V Telecom and Server Power Monitoring
In telecom rectifiers and server power shelves, the 26 V common-mode ceiling of the INA2181A2QDGSRQ1 covers 12 V and 24 V intermediate bus rails with margin, while its supply-independent common-mode operation means the 5 V logic supply can dip during brownout without corrupting the measurement. The dual channels independently monitor two power rails with a single VSSOP-10 footprint, saving roughly 50% of the board area versus two single-channel amplifiers. The 50 V/V gain pairs well with 2-5 mohm shunts in tens-of-amps paths, and the rail-to-rail output maximizes ADC dynamic range for power telemetry accuracy.
Recommended
Motor Drive Phase and Rail Current Sense
Motor-control systems need fast, accurate current feedback for torque control and overcurrent protection. The INA2181A2QDGSRQ1's 350 kHz bandwidth provides propagation fast enough for cycle-by-cycle limit checking at typical PWM frequencies, while the -0.2 V common-mode floor accommodates low-side shunts that swing slightly below ground during switching transients. Each channel can monitor a different phase or the DC bus with one reference pin per channel, enabling bidirectional measurement during regenerative braking. Place the amplifier close to the shunt with Kelvin connections to keep the 50 V/V amplified path free of parasitic drops.
Recommended
Industrial 24V Rail Power Telemetry
Industrial PLCs and factory automation equipment run on 24 V buses, and the INA2181A2QDGSRQ1's +26 V common-mode maximum covers this rail with 2 V of margin. The device's ground-referenced, rail-to-rail output simplifies interfacing to 3.3 V or 5 V ADCs without level shifting. Using both channels, a designer can monitor supply input current and a branch load simultaneously, computing branch power in firmware. The industrial-relevant -40C to +125C range suits uncontrolled cabinet environments, and the cost-optimized design of the INAx181-Q1 family makes per-node sensing economical across many monitored channels.
Recommended
Battery-Powered Portable and IoT Devices
For battery-current profiling in portable devices, the INA2181A2QDGSRQ1's 50 V/V gain permits very small shunt resistances, keeping sense losses negligible at peak loads while still resolving milliamp sleep currents when combined with a higher-resolution ADC reading near the reference-centered output. The bidirectional architecture captures both charge and discharge through the same shunt, which is essential for coulomb counting in rechargeable systems. Its small 3 mm VSSOP-10 package fits space-constrained wearables and IoT nodes, and the 350 kHz bandwidth captures load-step transients that slower monitors would average out.
Recommended
Networking and Base Station Power Distribution
Network switches, routers, and small-cell base stations distribute power across many daughter cards, each needing current telemetry for remote health monitoring. One INA2181A2QDGSRQ1 monitors two card feeds with its dual channels, and its 26 V common-mode range handles 12 V and 24 V distribution buses. The external reference pin per channel allows the output to be offset for bidirectional feeds or to match a specific ADC input span. Fast 350 kHz response flags short-circuit conditions on a card before backplane fuses open, improving fault isolation in high-availability infrastructure.
Recommended
Recommended Products Summary
Engineering reference data for INA2181A2QDGSRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA2181A1QDGSRQ1 | INA2181A4QDGSRQ1 | INA2181A2IDGSR | INA2181A3IDGSR |
|---|---|---|---|---|---|
| Package | VSSOP-10 (DGS) | 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 |
| Gain | 50 V/V (A2) | 20 V/V (A1) | 200 V/V (A4) | 50 V/V (A2) | 100 V/V (A3) |
| Channels | 2 | 2 | 2 | 2 | 2 |
| 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 |
| Bandwidth | 350 kHz | 350 kHz | 350 kHz | 350 kHz | 350 kHz |
| AEC-Q100 Qualified | Yes (Q1) | Yes (Q1) | Yes (Q1) | No (industrial) | No (industrial) |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Key Differentiators
- Dual channels in one VSSOP-10 package (vs INA2181A2IDGSR)
- 50 V/V gain balances noise and headroom (vs INA2181A4QDGSRQ1)
- 26 V common-mode independent of supply (vs INA2181A1QDGSRQ1)
Design Notes
Route Kelvin sense traces from the shunt resistor pads directly to INA+ and INA- pins; do not share current-carrying copper with the sense traces. Any parasitic resistance in series with a sense input is amplified by the 50 V/V gain, producing offset error. Keep the input loop small and place the device within a few millimeters of the shunt. Add a 0.1 uF decoupling capacitor within 2 mm of the VS pin (pin 8) to ground, plus bulk capacitance at the supply rail.
The device tolerates common-mode transients up to +26 V on the shunt inputs regardless of the 2.7 V to 5.5 V supply, but the supply itself must never exceed its absolute maximum. For inductive loads on the measured rail, add input filtering (for example 100 ohm series resistors with a small differential capacitor across the inputs) to limit transient currents during fault events; note that series resistance introduces a small gain error proportional to input impedance. Verify worst-case output swing against your ADC input range at minimum supply.
For bidirectional sensing, REFA and REFB must be driven from a low-impedance source - a resistor divider alone will shift as the outputs source or sink current into the reference node; buffer the divider with an op amp or reference IC. Also remember the A2 gain is fixed at 50 V/V: with a 3.3 V supply, maximum measurable shunt drop is roughly 66 mV before output clipping, so size the shunt so peak current stays inside this headroom while the resolution floor still meets accuracy targets.
Compliance Information
AEC-Q100 qualified per TI INA2181-Q1 product page and DigiKey/Mouser listings. RoHS/lead-free status per DigiKey product listing; REACH and halogen-free status not stated in provided data.
