INA2181A3QDGSRQ1 - 26V Dual-Channel Current Sense Amp | TI
MPN： INA2181A3QDGSRQ1 ✓ 啟用中INA2181A3QDGSRQ1 概覽
A current-sense amplifier is a precision differential amplifier optimized to measure the small voltage drop across a shunt resistor while rejecting large common-mode voltages. Within the power management IC hierarchy, it sits alongside fuel gauges and hot-swap controllers as a core current-monitoring building block, converting a differential shunt signal into a ground-referenced, single-ended output that ADCs and microcontrollers can digitize directly.
Key features include the wide -0.2 V to +26 V common-mode range (which permits low-side, high-side, and in-line sensing), bidirectional operation with a reference pin per channel for charging and discharging current measurement, and the dual-channel integration that halves board area versus two single-channel parts. The A3 gain option (100 V/V) is well matched to low-value shunts (0.5 mOhm to 5 mOhm) in higher-current rails, reducing shunt power dissipation.
The device belongs to the cost-optimized INAx181 family (INA181/INA2181/INA4181) and the Q1 variant is characterized over -40C to +125C and qualified to AEC-Q100 for automotive designs. The voltage-output architecture requires no external compensation and settles quickly, and the 350 kHz bandwidth supports both DC load monitoring and fast event detection such as inrush peaks in 12 V automotive battery rails.
Typical applications include automotive body electronics and ADAS power monitoring, battery current monitoring in 12 V and 24 V systems, motor drive phase and DC-bus current sensing, and telecom/server power-supply supervisory circuits.
Design consideration: choose the shunt value so the full-scale differential input remains within the specified input range at maximum load, and bias REF1/REF2 from a low-impedance source (buffered reference or divider with buffer) because REF pin impedance affects output offset.
This page synthesizes distributor pricing, drop-in same-family alternatives, pin guidance, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 INA2181A3QDGSRQ1 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： INA2181A3QDGSRQ1 （相同外形與佔位） — 差異在於 Output Type, Package, RoHS Status, Operating Temperature Range, Channels.
INA2181A2QDGSRQ1
✅ 直接替換聯絡詢價
查看資料表 →INA2181A4QDGSRQ1
✅ 直接替換聯絡詢價
查看資料表 →INA2181A1QDGSRQ1
✅ 直接替換聯絡詢價
查看資料表 →INA2181A3IDGSR
✅ 直接替換聯絡詢價
查看資料表 →INA2181A2IDGSR
✅ 直接替換聯絡詢價
查看資料表 →INA2181A4IDSQR
✅ 直接替換聯絡詢價
查看資料表 →INA2181A3QDGSRQ1 最大額定值與電氣特性
| 通道數 | 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 |
| 輸出類型 | Voltage output (rail-to-rail) |
| Automotive Qualification | AEC-Q100 qualified (Q1) |
| 工作溫度 | -40C to +125C |
| 封裝 | VSSOP (DGS), 10 pins |
| 安裝類型 | Surface Mount |
| Reference Pins | REF1 and REF2 for bidirectional offset |
INA2181A3QDGSRQ1 vssop (dgs), 10 pins 腳位配置指南
INA2181A3QDGSRQ1（vssop (dgs), 10 pins 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： INA2181A3QDGSRQ1.
請參閱 資料表 以查看完整腳位配置。
典型應用
INA2181A3QDGSRQ1 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 INA2181A3QDGSRQ1 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
| 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 |
主要差異化特點
- Dual channel integration halves BOM count (對比INA181A3QDGKTQ1)
- Automotive Q1 grade at cost-optimized pricing (對比INA2181A3IDGSR)
- Gain scaling flexibility within the same footprint (對比INA2181A2QDGSRQ1)
設計說明
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.
合規資訊
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.
