INA2181A4IDSQR - 26V Dual Current Sense Amp 200V/V | TI
MPN: INA2181A4IDSQR ✓ Hoạt độngINA2181A4IDSQR Tóm tắt
A current sense amplifier is a special-purpose difference amplifier that measures the small voltage drop across a shunt resistor and converts it to a ground-referenced output signal. Within the power management IC hierarchy, current-shunt monitors sit alongside voltage regulators and supervisors as essential elements of power monitoring, protection, and telemetry subsystems in both high-side and low-side topologies.
Key features of the INA2181A4 include common-mode voltage sensing from -0.2 V to +26 V independent of the supply voltage, which allows a 3.3 V or 5 V microcontroller to supervise a 24 V industrial rail directly. The dual-channel architecture monitors two shunts with a single IC, saving board area and BOM cost in cost-optimized designs. The 350 kHz bandwidth supports fast load-transient and short-circuit detection loops, and the rail-to-rail output maximizes ADC dynamic range on low supply rails.
Technically, the INA2181 family uses a precision frontend that rejects the high common-mode voltage, amplifying only the differential shunt signal. The bidirectional REF pin allows the output to be offset so that charging and discharging currents can be distinguished by the monitoring ADC. The 200 V/V gain of the A4 version is optimized for small shunt resistors, minimizing insertion loss and power dissipation in the sense element.
Typical applications include battery charging and discharging telemetry in portable and battery-backup systems, motor control DC bus monitoring, server and telecom board-level power telemetry, and 24 V industrial PLC input rails. The dual channel suits push-pull converters and dual-rail systems.
Design consideration: with a 200 V/V gain, input offset is amplified twenty-fold, so shunt value and layout symmetry drive accuracy; Kelvin-connect the shunt and consider the REF pin buffering. The compact 2 mm x 2 mm WSON requires careful thermal pad soldering for the exposed die-attach pad.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho INA2181A4IDSQR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với INA2181A4IDSQR (cùng hình factor và footprint) — khác nhau ở Package, Output Type, Common-Mode Voltage Range, Channels, RoHS Status.
INA2181A3IDSQR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
INA2181A2IDSQR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
INA2181A1IDSQR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →INA2181A4IDSQR Tỷ lệ tối đa & tính chất điện
| Product Type | Current Sense Amplifier (Current-Shunt Monitor) |
| Kênh | 2 |
| Gain (A4 option) | 200 V/V, fixed |
| Bandwidth | 350 kHz |
| Common-Mode Voltage Range | -0.2 V to +26 V |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Kiểu đầu ra | Rail-to-Rail, voltage output, bidirectional |
| Sensing Topology | High-side or low-side |
| Khoảng nhiệt độ hoạt động | -40 C to +125 C |
| Hộp | 10-WSON (DSQ), 2 mm x 2 mm |
| Kiểu lắp đặt | Surface Mount |
| MSL Rating | MSL 1 - 260 C - UNLIM |
| Trạng thái RoHS | RoHS & Green compliant |
| REACH Compliance | Unknown - see compliance_info |
| Automotive Qualification | Not AEC-Q100 (see INA2181-Q1 variants) |
Hướng dẫn cấu hình chân INA2181A4IDSQR 10-wson (dsq), 2 mm x 2 mm
Cấu hình chân cho INA2181A4IDSQR (10-wson (dsq), 2 mm x 2 mm gói). Thành phần số hiệu này có chân đầu vào, đầu ra và nguồn cung cấp. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết cấu hình chân bù, bù trừ và chân kích hoạt. Hoàn hảo cho điều kiện tín hiệu và mạch khuếch đại.
Không có dữ liệu chân cụ thể sẵn có cho INA2181A4IDSQR.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
INA2181A4IDSQR phù hợp cho 6 Áp dụngs: Battery Charge/Discharge Monitoring, 24 V Industrial Rail Monitoring, Motor Control DC Bus Current Sensing, Server and Telecom Board Power Telemetry, Portable and IoT Device Power Management, Automotive-Adjacent 12 V Bus Monitoring (Non-Q1 Applications).
Battery Charge/Discharge Monitoring
The INA2181A4IDSQR fits battery telemetry because its -0.2 V to +26 V common-mode range measures battery bus voltage directly while its 200 V/V gain amplifies millivolt-level shunt drops to ADC-friendly levels. The bidirectional REF pin offsets the rail-to-rail output mid-scale (e.g., 1.65 V on a 3.3 V supply) so charge current appears above offset and discharge below, allowing a single ADC input to resolve both directions. The dual channels let one device monitor charge and discharge shunts separately for higher resolution. With 350 kHz bandwidth, fast inrush and fault currents are captured, supporting protection firmware in portable, UPS, and battery-backup designs.
Được đề xuất
24 V Industrial Rail Monitoring
Industrial PLC and factory automation systems run 24 V rails that a 5 V microcontroller cannot sense directly. The INA2181A4IDSQR solves this because its common-mode range extends to +26 V independent of its own 2.7-5.5 V supply, so the high-side shunt on a 24 V bus is measured safely and its output is ground-referenced for the controller. The 200 V/V gain suits low-ohm shunts (2-10 milliohm) typical on power distribution boards, keeping insertion loss minimal. The dual channel monitors two buses (e.g., 24 V input and 5 V logic rail) with one 2 mm x 2 mm WSON device, cutting BOM cost and board area in cost-optimized industrial designs.
Được đề xuất
Motor Control DC Bus Current Sensing
In BLDC and PMSM servo drives, DC bus overcurrent detection demands both speed and voltage tolerance. The INA2181A4IDSQR delivers 350 kHz bandwidth, fast enough for protection loops responding within microseconds of a stall or short, while the +26 V common-mode limit covers 12 V and 24 V drive buses. The high 200 V/V gain enables small shunts that limit power loss in the bus path. The bidirectional output with REF offset captures regenerative braking currents flowing back into the supply. The dual channels can independently monitor the bus and a leg current, or two motor phases, within a single footprint compatible with space-constrained drive PCBs.
Được đề xuất
Server and Telecom Board Power Telemetry
Datacenter and telecom line cards require per-rail current telemetry for power budgeting and thermal management. The INA2181A4IDSQR monitors shunts on -48 V-derived intermediate buses up to 26 V common-mode and on 12 V distribution rails, feeding host-management ADCs with a rail-to-rail output. The dual-channel WSON 2 mm x 2 mm footprint integrates two monitors into the area of one, easing dense power-tree layouts. Its cost-optimized design suits high-volume boards where per-point telemetry cost must stay low. The 200 V/V gain pairs with 1-5 milliohm shunts so full-load drops stay in the tens of millivolts, preserving efficiency on multi-amp rails.
Được đề xuất
Portable and IoT Device Power Management
Battery-powered consumer and IoT products need accurate current telemetry to extend runtime and detect faults, at minimal cost and area. The INA2181A4IDSQR operates from a 2.7 V supply, compatible with single-cell Li-ion and 3.3 V systems, and its 200 V/V gain resolves microamp-to-amp dynamic ranges using small shunts with the REF offset trick for bidirectional measurement. Its MSL 1 rating and compact WSON-10 package simplify assembly on dense two-sided boards. The dual channels can separately monitor system load and charger current, enabling charge-termination algorithms and short-circuit logging in firmware. The rail-to-rail output preserves ADC resolution at light loads where telemetry accuracy matters most.
Được đề xuất
Automotive-Adjacent 12 V Bus Monitoring (Non-Q1 Applications)
Twelve-volt accessory and auxiliary buses in trucks, agricultural equipment, and off-highway vehicles fall within the INA2181A4IDSQR's +26 V common-mode limit, allowing high-side shunt monitoring of loads such as pumps, fans, and heaters. The 350 kHz bandwidth catches wire-harness fault transients, while the 200 V/V gain with low-value shunts keeps sense-path losses negligible. Designers must note the standard part is not AEC-Q100 qualified; for true automotive programs, TI's INA2181-Q1 variants (e.g., INA2181A4QDGSRQ1 family naming) carry the qualification, with the gain-suffix convention retained. The dual channel supports monitoring both a load branch and its return path for plausibility checks.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho INA2181A4IDSQR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | INA2181A3IDSQR | INA2181A2IDSQR | INA2181A1IDSQR |
|---|---|---|---|---|
| Package | 10-WSON (DSQ), 2 mm x 2 mm | 10-WSON (DSQ) - same | 10-WSON (DSQ) - same | 10-WSON (DSQ) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Fixed Gain | 200 V/V | 100 V/V | 50 V/V | 20 V/V |
| Channels | 2 | 2 | 2 | 2 |
| Bandwidth | 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 |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Automotive Grade (Q1) | No | No (Q1 variants exist) | No (Q1 variants exist) | No (Q1 variants exist) |
Bảo phân biệt quan trọng
- Highest gain in the dual-channel INAx181 family (vsINA2181A3IDSQR)
- Dual-channel density in 2 mm x 2 mm (vsINA181A4 (single-channel, different package))
- Cost-optimized positioning (vsINA2181A1IDSQR)
Ghi chú thiết kế
Kelvin-connect the shunt resistor: route the IN+ and IN- traces directly to the shunt terminals, not to shared current-carrying copper. With 200 V/V gain, every milliohm of parasitic trace resistance adds gain error, and asymmetric routing adds offset. Keep the differential pair short and symmetric, and guard the sense lines from switching-node aggressors. The exposed die-attach pad of the WSON (DSQ) package should be soldered to a grounded pad per the TI INAx181 datasheet layout section for thermal and mechanical reliability.
The REF pin sets the bidirectional zero-current output level. Do not drive it directly from a resistor divider with high impedance - the REF pin current creates a gain-dependent offset error. Buffer the divider with an op amp (e.g., a low-offset op amp) or use a precision reference. Estimated: on a 3.3 V rail with REF at 1.65 V, the 200 V/V gain gives +/-8.25 mV full-scale input swing, i.e., with a 5 milliohm shunt about +/-1.65 A bidirectional range before clipping.
Select the gain variant before finalizing the shunt: the A4 200 V/V gain amplifies input offset twenty-fold relative to the A1, so accuracy targets at light load may force a lower-gain variant on the same footprint. Also verify the common-mode rating of 26 V against worst-case bus transients - automotive load-dump on a 12 V rail can exceed it, which is a reason to use the INA2181-Q1 family with appropriate absolute maximums for those environments. Confirm the DSQ pin table, since the DGS package pinout differs.
Thông tin tuân thủ
RoHS & Green compliant per TI compliance data referenced by distributor listings; MSL 1 - 260 C - UNLIM. Not AEC-Q100 qualified - use INA2181-Q1 variants for automotive. REACH status should be confirmed on the TI product folder.
