INA2181A4QDGSRQ1 - 26V Dual 350kHz Current Sense Amp AEC-Q100 | TI
料号： INA2181A4QDGSRQ1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 |
INA2181A4QDGSRQ1 概述
A current sense amplifier is a specialized difference amplifier, within the broader hierarchy of instrumentation amplifiers and operational amplifier signal-conditioning ICs, designed to measure the small differential voltage developed across a shunt resistor and convert it into a ground-referenced output voltage proportional to load current. Bidirectional devices like the INA2181 also detect current flowing in both directions, which is essential in battery charging and discharging monitoring.
Key features of the INA2181A4QDGSRQ1 include the wide -0.2 V to 26 V common-mode range that survives automotive load-dump-adjacent conditions, dual-channel integration that halves board area versus two single-channel amplifiers, a 350 kHz bandwidth suitable for fast current-loop control, and the cost-optimized INAx181-Q1 family architecture.
Technically, the INA2181-Q1 uses a zero-drift-free precision front end with a fixed gain set by internal resistors; the A4 variant provides 200 V/V gain, allowing very small shunt resistances (sub-10 mOhm) to be used, reducing shunt power dissipation at high currents. The voltage output architecture requires no ADC-side gain stage and simplifies interfacing with microcontroller ADC inputs.
Typical applications include automotive battery management systems, 48V and 12V automotive power rails, industrial motor drives, telecom -48V systems, and server hot-swap current monitoring.
Design-wise, place the shunt resistor close to the amplifier inputs, use Kelvin (4-wire) connections to the sense resistor, and filter differential noise at the inputs. Note that the 200 V/V gain limits full-scale shunt voltage to about 20 mV for a 4 V output swing.
This page synthesizes distributor pricing, drop-in same-family gain-variant alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： INA2181A4QDGSRQ1 ——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： INA2181A4QDGSRQ1 （相同外形与封装尺寸） ——差异在于 Output Type, Package, Common-Mode Voltage Range, Channels, Qualification.
快速对比工具——选择替代料号进行并排对比：
INA2181A2QDGSRQ1
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.52 / 个
查看数据手册 →INA2181A1QDGSRQ1
✅ 直接替换✓ 有现货
$0.35 / 个
查看数据手册 →INA2181A3QDGSRQ1
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.23 / 个
查看数据手册 →INA2181A2IDGSR
✅ 直接替换✓ 有现货
$0.19 / 个
查看数据手册 →INA2181A1IDGSR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.52 / 个
查看数据手册 →INA2181A3IDGSR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.29 / 个
查看数据手册 →INA2181A4QDGSRQ1 最大额定值与电气特性
| 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 |
| 输出类型 | Rail-to-rail voltage output, bidirectional (REF pin) |
| Sensing Method | Low-side and high-side, bidirectional |
| 工作温度范围 | -40C to +125C (TA) |
| 封装 | 10-VSSOP (DGS) |
| 安装类型 | Surface Mount |
| Qualification | AEC-Q100 qualified (automotive) |
| RoHS 状态 | Compliant (per distributor listing) |
| Family | INAx181-Q1 (INA181-Q1, INA2181-Q1, INA4181-Q1) |
| Packaging | Tape and Reel (R suffix) |
INA2181A4QDGSRQ1 10-vssop (dgs) 引脚配置指南
INA2181A4QDGSRQ1（10-vssop (dgs) 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： INA2181A4QDGSRQ1.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA2181A4QDGSRQ1 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： INA2181A4QDGSRQ1 ——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 | 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) |
关键差异点
- Highest gain in the INA2181 family (A4 = 200 V/V) （对比 INA2181A2IDGSR)
- AEC-Q100 automotive qualification （对比 INA2181A2IDGSR)
- Dual-channel integration （对比 INA181A4QDCT (single-channel family member))
- Common-mode independent of supply （对比 Generic shunt monitors without -0.2 V capability)
设计说明
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.
合规信息
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.
