INA2181A4QDGSRQ1 - 26V Dual 350kHz Current Sense Amp AEC-Q100 | TI
MPN: INA2181A4QDGSRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.29 | $1.29 |
| 10 | $1.16 | $11.60 |
| 100 | $0.98 | $98.00 |
| 500 | $0.86 | $430.00 |
| 1,000 | $0.72 | $720.00 |
Drop-in alternatives for INA2181A4QDGSRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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View Datasheet →INA2181A4QDGSRQ1 Maximum Ratings & Electrical Characteristics
| Product Type | Dual-channel bidirectional current sense amplifier |
| Number of Channels | 2 |
| Gain (A4 variant) | 200 V/V |
| Bandwidth | 350 kHz |
| Common-Mode Voltage Range | -0.2 V to +26 V |
| Supply Voltage (Max) | 5.5 V |
| Output Type | Rail-to-rail voltage output, bidirectional (REF pin) |
| Sensing Method | Low-side and high-side, bidirectional |
| Operating Temperature Range | -40C to +125C (TA) |
| Package | 10-VSSOP (DGS) |
| Mounting Type | Surface Mount |
| Qualification | AEC-Q100 qualified (automotive) |
| RoHS Status | Compliant (per distributor listing) |
| Family | INAx181-Q1 (INA181-Q1, INA2181-Q1, INA4181-Q1) |
| Packaging | Tape and Reel (R suffix) |
INA2181A4QDGSRQ1 10-vssop (dgs) Pin Configuration Guide
Complete pinout information for INA2181A4QDGSRQ1 (10-vssop (dgs) package). 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 INA2181A4QDGSRQ1.
Refer to the datasheet for full pin configuration.
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
INA2181A4QDGSRQ1 is suitable for 6 applications: Automotive 12V/24V Battery Current Monitoring, Industrial Motor Drive Phase/Shunt Current Sense, Telecom -48V Power Supply Monitoring, Server Hot-Swap and eFuse Current Monitoring, 48V Light Electric Vehicle / E-bike BMS, Test and Measurement / Bench Instrumentation.
Automotive 12V/24V Battery Current Monitoring
The INA2181A4QDGSRQ1 fits automotive battery current monitoring because its -0.2 V to +26 V common-mode range tolerates reverse-connection and load-switch transients on 12 V board nets, while its AEC-Q100 qualification and -40C to +125C rating satisfy automotive quality requirements. The dual channels independently monitor charge and discharge paths, or two battery branches, in one 10-VSSOP footprint, roughly halving board area versus two single-channel parts. With the A4 gain of 200 V/V, a 1 mOhm shunt yields 4 V of output at 20 A, keeping shunt dissipation below 0.5 W. The 350 kHz bandwidth captures inrush and switching transients that slower monitors miss.
Recommended
Industrial Motor Drive Phase/Shunt Current Sense
In industrial motor drives, the INA2181A4QDGSRQ1 monitors DC-link and low-side phase currents where its 350 kHz bandwidth supports fast current-loop control and overcurrent protection. The bidirectional output, referenced via the REF pin, cleanly represents regenerative (negative) current during braking without external level shifting. The 26 V common-mode rating covers 24 V industrial rail high-side sensing independent of the 5.5 V maximum amplifier supply. Using the A4 gain allows low-resistance shunts (1 to 5 mOhm), reducing conduction loss in high-current paths. Its dual channels monitor two shunts simultaneously for DC bus plus one phase, saving layout area and cost versus discrete amplifiers.
Recommended
Telecom -48V Power Supply Monitoring
The INA2181A4QDGSRQ1's -0.2 V below-ground common-mode capability makes it well suited to low-side and mid-rail current sensing in telecom power systems where ground bounce causes shunt common-mode excursions below 0 V. In -48 V rectifier and distribution shelves, the amplifier can monitor current on the return path or on 24 V intermediate-bus sections within its 26 V common-mode limit. The bidirectional architecture handles both charging and discharging of backup battery strings through the same shunt. Its voltage output interfaces directly to system controller ADCs without additional gain stages, and AEC-Q100 qualification provides margin for the wide temperature swings of outdoor telecom cabinets.
Recommended
Server Hot-Swap and eFuse Current Monitoring
Server backplanes and hot-swap controllers need fast, accurate current telemetry: the INA2181A4QDGSRQ1's 350 kHz bandwidth and 200 V/V gain detect fault currents within microseconds when paired with a comparator, while its 26 V common-mode range suits 12 V and 24 V server racks including transients above the nominal rail. The dual channels monitor input and output sides of an ORing or eFuse stage with a single IC. The small 10-VSSOP footprint fits dense power-board layouts near the shunt. AEC-Q100 robustness is a reliability bonus for always-on datacenter hardware, and the rail-to-rail output drives BMC ADC inputs directly across the full measurement span.
Recommended
48V Light Electric Vehicle / E-bike BMS
Light electric vehicles and e-bikes commonly use 24 V to 36 V battery packs; within the INA2181A4QDGSRQ1's 26 V common-mode ceiling it monitors low-side pack current and 12 V accessory rails high-side. The bidirectional output tracks regenerative braking currents flowing backward through the shunt, which unidirectional monitors cannot capture. With 200 V/V gain, sub-5 mOhm shunts keep conduction losses negligible at the 20 A to 40 A drive currents typical of these systems. The -40C to +125C range covers enclosed motor-controller thermal environments, and the compact VSSOP package integrates into space-constrained BMS boards alongside gate drivers and MCU supervision circuits.
Recommended
Test and Measurement / Bench Instrumentation
Bench power supplies, electronic loads, and USB power analyzers require precise bidirectional current readback: the INA2181A4QDGSRQ1's fixed 200 V/V gain, rail-to-rail output, and 350 kHz bandwidth deliver both DC accuracy and transient capture for instrumentation front ends. Dual channels let one device monitor source and sink paths simultaneously, useful in four-quadrant supply designs. The -0.2 V common-mode floor handles measurement setups where the shunt sits below instrument ground. Because the gain is factory-set, no precision external gain resistors are needed, simplifying calibration to a single-point shunt trim. The VSSOP-10 package fits portable instruments where PCB area and probe access are both constrained.
Recommended
Recommended Products Summary
Engineering reference data for INA2181A4QDGSRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA2181A2QDGSRQ1 | INA2181A1QDGSRQ1 | INA2181A3QDGSRQ1 | INA2181A2IDGSR |
|---|---|---|---|---|---|
| Package | 10-VSSOP (DGS) | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gain | 200 V/V | 50 V/V | 20 V/V | 100 V/V | 50 V/V |
| Bandwidth | 350 kHz | 350 kHz | 350 kHz | 350 kHz | 350 kHz |
| 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 |
| Channels | 2 (bidirectional) | 2 (bidirectional) | 2 (bidirectional) | 2 (bidirectional) | 2 (bidirectional) |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | No (industrial grade) |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C (industrial) |
| Price (qty 1, as of 2026-09-03) | ~$1.29 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Highest gain in the INA2181 family (A4 = 200 V/V) (vs INA2181A2IDGSR)
- AEC-Q100 automotive qualification (vs INA2181A2IDGSR)
- Dual-channel integration (vs INA181A4QDCT (single-channel family member))
- Common-mode independent of supply (vs Generic shunt monitors without -0.2 V capability)
Design Notes
Use Kelvin (4-wire) connections to the shunt resistor: route the IN+ and IN- traces directly from the shunt pads, not from shared high-current copper. This eliminates trace IR drop error, which at 200 V/V gain translates to significant current-reading error (1 mOhm of extra trace resistance on a 20 A path reads as 4 V of false output with the A4 gain). Keep the shunt within a few millimeters of the amplifier and use a solid, low-impedance ground for the GND and REF pins.
With 200 V/V gain, full-scale differential input is only about 20 mV - a 26 V common-mode transient can couple large differential errors if layout is asymmetric. Keep the IN+ and IN- traces matched in length and symmetric, and place a differential filter (e.g., 10 ohm plus 100 nF, giving roughly 160 kHz cutoff) at the inputs if switching noise from upstream converters is present. Also verify the REF pin is driven from a low-impedance source; a resistor divider alone causes gain errors.
The amplifier supply (VS) must not exceed 5.5 V, while the common-mode input tolerates up to 26 V independent of supply - this independence is a key family feature. Estimated: on a 5 V supply with both channels active, the device power draw is modest (sub-10 mA class per family specs), so thermal design is generally not required; still, confirm quiescent current from the TI datasheet for battery-powered designs.
The REF pin sets the zero-current output level for bidirectional measurement. For best accuracy buffer the REF voltage with an op amp or use a precision reference IC rather than a bare divider, since REF pin current flows into the internal divider network. Decouple REF with 100 nF to ground to prevent output jitter from REF noise, which appears directly at the output at unity gain.
Compliance Information
AEC-Q100 qualified per TI product page and Mouser listing (Q1 suffix). RoHS compliant per distributor listings; verify REACH and halogen-free status on TI's official product page for audit purposes.
