INA2181A1IDSQR - 26V Dual-Channel Current Sense Amp | TI
料号： INA2181A1IDSQR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.8 | $0.80 |
| 10 | $0.73 | $7.30 |
| 100 | $0.66 | $66.00 |
| 500 | $0.6 | $300.00 |
| 1,000 | $0.55 | $550.00 |
INA2181A1IDSQR 概述
A current sense amplifier (also called a current-shunt monitor) is a specialized precision amplifier that measures the small voltage drop across a shunt resistor and amplifies it to a ground-referenced output signal. Within the signal-chain hierarchy, it belongs to special-purpose amplifiers, a subcategory of operational amplifier technology used in power management and closed-loop current monitoring. The INA2181 integrates two independent current-sense channels in one package, halving board area compared with two single-channel INA181 devices.
Key features include a wide 0V-to-26V common-mode input range that is independent of the 1.7V-to-5.5V supply, a 350kHz bandwidth for fast overcurrent detection, a bi-directional output with an external REF pin for charging-and-discharging current measurement, and a rail-to-rail output stage. The A1 gain version provides 20 V/V, well matched to low-value shunts in high-current rails.
Architecturally, the INA2181 uses a unidirectional-free, zero-drift-trimmed front end that keeps offset low while rejecting common-mode voltages well above the supply rail. Input bias paths allow the device to operate on the low side or high side of the bus, and the offset pin (REF) allows bipolar current sign encoding around mid-supply.
Typical applications include battery-current monitoring in portable and industrial equipment, DC motor-control phase and rail current sensing, and overcurrent protection supervision in 24V industrial buses and server power rails.
For design, remember that bandwidth trades with noise: the 350kHz bandwidth suits fast fault detection but requires short, symmetrical shunt traces (Kelvin sensing) to preserve accuracy.
This page synthesizes distributor pricing, same-family drop-in gain options, and practical design notes not found together on the manufacturer datasheet page.
直接替换替代料： INA2181A1IDSQR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： INA2181A1IDSQR （相同外形与封装尺寸） ——差异在于 Output Type, Package, Common-Mode Voltage Range, RoHS Status, Supply Voltage Range.
快速对比工具——选择替代料号进行并排对比：
INA2181A4IDSQR
✅ 直接替换✓ 有现货
$0.18 / 个
查看数据手册 →INA2181A2IDSQR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
INA2181A3IDSQR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
INA2181A1IDGSR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.52 / 个
查看数据手册 →INA2181A1IDSQR 最大额定值与电气特性
| 通道数 | 2 (dual) |
| Common-Mode Voltage Range | -0.2 V to 26 V |
| Gain (A1 option) | 20 V/V, fixed |
| Bandwidth | 350 kHz |
| 输出类型 | Voltage output, rail-to-rail, bi-directional |
| Supply Voltage Range | 1.7 V to 5.5 V |
| Sensing Topology | Low-side and high-side, bi-directional |
| 工作温度 | -40C to +125C |
| 封装 | 10-pin WSON (DSQ), 2x2 mm, exposed pad |
| 安装类型 | Surface Mount |
| Qualification | AEC-Q100 qualified |
| RoHS 状态 | Compliant |
| Package Family | WSON / DFN family, surface mount |
INA2181A1IDSQR wson / dfn family, surface mount 引脚配置指南
INA2181A1IDSQR（wson / dfn family, surface mount 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： INA2181A1IDSQR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA2181A1IDSQR 适用于 6 应用s: Battery Current Monitoring, DC Motor Control Phase Current Sensing, Overcurrent Protection Supervision, 24V Industrial Bus Power Monitoring, Portable and Wearable Device Power Management, Server and Telecom Board Power Telemetry.
Battery Current Monitoring
The INA2181A1IDSQR fits battery current monitoring because its -0.2V-to-26V common-mode range tolerates fully discharged and deeply charged packs independent of its 1.7V-to-5.5V logic supply, and its bi-directional output with the REF pin distinguishes charge from discharge current around a mid-supply reference. With the 20 V/V A1 gain, a 1 mOhm shunt produces 20 mV per amp, keeping measurement error low at high current while leaving headroom on a 3.3V ADC. Two channels in the 2x2 mm WSON-10 package can monitor pack current and a second rail simultaneously, halving board area versus two single-channel monitors. Place the device close to the shunt with Kelvin-connected inputs; the 350kHz bandwidth also captures inrush and load-transient events that slower monitors average out.
推荐
DC Motor Control Phase Current Sensing
In DC and BLDC motor drives, per-phase current feedback closes the torque control loop and enables overcurrent protection. The INA2181A1IDSQR suits this task because its 350kHz bandwidth resolves PWM-frequency current ripple without excessive phase lag, and two integrated channels monitor two shunts (for example, two half-bridge legs) in a single 2x2 mm WSON-10 footprint. The 26V common-mode range withstands bus transients above the 12V or 24V supply, and the A1 20 V/V gain pairs well with sub-milliohm shunts used in ampere-class motors. AEC-Q100 qualification supports automotive motor applications. Keep the shunt-to-amplifier traces symmetrical and pair the output with an MCU ADC trigger synchronized to the PWM center for lowest-noise sampling.
推荐
Overcurrent Protection Supervision
For rail-level overcurrent detection, the INA2181A1IDSQR provides a fast analog output whose 350kHz bandwidth propagates a fault-induced shunt voltage to the comparator within microseconds, far quicker than software-only polling of slower monitors. The A1 20 V/V gain with a few milliohm shunt sets a clean comparator threshold, while the rail-to-rail output drives 1.8V-to-5V logic comparators directly. The 26V common-mode rating covers 24V industrial rails with margin, and AEC-Q100 qualification extends use into automotive load protection. Because the output is bi-directional via the REF pin, a single channel can supervise both forward and reverse fault currents. Use a small RC filter (about 100 ohm and 1 nF) only if you can tolerate roughly 1 microsecond of added response delay.
推荐
24V Industrial Bus Power Monitoring
Industrial 24V rails frequently see surges beyond nominal voltage, and the INA2181A1IDSQR's 26V common-mode limit plus -0.2V reverse tolerance covers these conditions without series protection diodes in many designs. Powered from a 3.3V rail, it translates shunt information to a ground-referenced, rail-to-rail output ready for an industrial MCU or PLC analog input. The dual channels let one device monitor both a main bus and an auxiliary rail, cutting BOM count and placement area in dense DIN-rail or robot controller boards. Its cost-optimized INAx181 architecture targets exactly this volume industrial segment. For measurement integrity, apply Kelvin sensing at the shunt and average multiple ADC samples, since the wide 350kHz bandwidth passes supply-line noise that slower filters would reject.
推荐
Portable and Wearable Device Power Management
Battery-powered portable devices need current telemetry at minimal size and quiescent cost, and the 2x2 mm WSON-10 package with two channels makes the INA2181A1IDSQR one of the most area-efficient dual-rail monitors available. Its 1.7V minimum supply allows operation directly from a single Li-ion cell through a small LDO or even near end-of-discharge rail voltages, while the 20 V/V gain works with low-dissipation milliohm shunts that preserve battery runtime. The rail-to-rail output interfaces directly to 1.8V ADCs common in wearable SoCs, and AEC-Q100 qualification exceeds consumer reliability requirements. Because the input common-mode range is supply-independent, the device keeps reporting current even when the monitored rail is briefly below ground during transients, protecting firmware state-of-charge algorithms from gaps.
推荐
Server and Telecom Board Power Telemetry
Server and telecom line cards monitor many power rails for health and fleet-level power analytics. The INA2181A1IDSQR addresses this with two channels per 2x2 mm device, so a board can densify dozens of monitored rails without crowding the underside of the PCB. The 26V common-mode input covers 12V intermediate bus and 24V telecom rails, while outputs scaled by the A1 20 V/V gain feed 3.3V ADC inputs or PMBus telemetry front ends. Its 350kHz bandwidth catches fast load steps during processor workload bursts, enabling both peak-power logging and fault forensics. Industrial -40C to +125C rating tolerates hot server intake conditions. Place shunts at the rail origin and route outputs as short single-ended signals to the supervisory ADC to keep telemetry noise low.
推荐
推荐产品汇总
工程参考数据： INA2181A1IDSQR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | INA2181A4IDSQR | INA2181A2IDSQR | INA2181A1IDGSR |
|---|---|---|---|---|
| Package | 10-pin WSON (DSQ) 2x2 mm | 10-pin WSON (DSQ) - same | 10-pin WSON (DSQ) - same | 10-pin VSSOP (DGS) - footprint rework |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gain | 20 V/V (A1) | 200 V/V (A4) | 50 V/V (A2) | 20 V/V (A1) |
| Channels | 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 |
| Bandwidth (A1 gain equivalent) | 350 kHz | lower (higher gain, datasheet bandwidth table) | lower (higher gain, datasheet bandwidth table) | 350 kHz |
| Supply Voltage | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V |
| Temperature Range | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
关键差异点
- Dual channels in a 2x2 mm WSON-10 footprint （对比 INA181 (single-channel SOT-23/SC70))
- Lowest gain (20 V/V) for low-value shunts （对比 INA2181A4IDSQR)
- Automotive reliability at sub-dollar cost （对比 INA2181A1IDGSR (same silicon, VSSOP))
设计说明
Use Kelvin (4-wire) connections from the INA2181A1IDSQR input pins directly to the shunt resistor pads. Any trace resistance in series with the inputs adds gain error: with the 20 V/V A1 gain, 10 milliohms of extra input trace resistance on a 1 milliohm shunt introduces roughly 1% error. Route both input traces symmetrically, keep them short, and avoid routing them near switch-node or gate-driver traces. The exposed pad of the WSON-10 (DSQ) package must be soldered to a grounded thermal land per the INAx181 datasheet layout guidelines.
Decouple the VS pin with a 0.1uF ceramic capacitor placed within 1-2 mm of the pin, plus bulk capacitance if the supply is shared with noisy loads. The 26V common-mode range is supply-independent, so the amplifier survives bus faults well above its 5.5V supply, but do not exceed the absolute-maximum input ratings stated in the manufacturer datasheet. If REF is driven by a resistor divider or DAC, buffer it or keep the source impedance low - the REF pin tolerance directly shifts the bi-directional zero-current point of the rail-to-rail output.
The 350kHz bandwidth passes supply and switching noise, so budget filtering deliberately. For motor PWM applications, synchronize ADC sampling to the PWM center (mid-ramp) instead of adding heavy RC filtering, preserving bandwidth for fault detection. If an RC filter is added at the output, remember its time constant adds to the fault response - a 100 ohm / 1 nF filter adds roughly 100 ns. Gain-choice pitfall: verify the A1 (20 V/V) suffix on the order code; mixing A2/A3/A4 parts onto the same footprint silently rescales all current readings by 2.5x to 10x.
Package suffix confusion is the most common ordering error in this family: DSQ is the 10-pin WSON 2x2 mm, while DGS is the 10-pin VSSOP - they are electrically identical but NOT footprint-compatible, so INA2181A1IDGSR cannot be placed on an IDSQR land pattern. Also note the bi-directional output requires the REF pin at a valid mid-scale reference for negative current sign; tying REF to ground makes the output unidirectional and clips reverse-current readings at zero.
合规信息
AEC-Q100 qualification stated by TI product page and distributor listings (HL Electronics). RoHS and lead-free status inferred from TI standard product flow; REACH, halogen-free, and conflict-minerals status not stated in provided data.
