INA117KU - ±200V High CMV Difference Amplifier | TI
Артикул: INA117KU ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $5.75 | $5,75 |
| 10 | $5.29 | $52,90 |
| 100 | $4.9 | $490,00 |
| 500 | $4.52 | $2.260,00 |
| 1.000 | $4.2 | $4.200,00 |
INA117KU Обзор
A difference amplifier is a special class of instrumentation amplifier that subtracts two input signals and rejects any voltage common to both inputs. Within the signal-chain hierarchy (difference amplifier -> instrumentation amplifier -> operational amplifier -> analog front end), the INA117 occupies a niche defined by extreme common-mode tolerance, allowing it to measure small differential signals riding on large DC or AC common-mode voltages.
Key features include a ±200V common-mode input range, protected inputs rated to ±500V common-mode and ±500V differential, unity gain with 0.02% max gain error, 0.001% max nonlinearity, and a minimum CMRR of 86 dB. These numbers stem from an integrated thin-film resistor network that is precisely matched on-chip, eliminating external precision resistor matching.
Architecturally, the monolithic IC combines a precision bipolar op amp with the laser-trimmed resistor network. Because the resistor ratios are trimmed on the same die, the INA117 achieves CMRR and accuracy unobtainable with discrete resistor-divided op amp circuits, and its CMRR holds up over temperature.
Typical applications include current shunt measurements on high-side bus rails, industrial motor drive voltage sensing, level shifting of high-voltage signals down to ADC-compatible ranges, and test equipment input conditioning.
Design-wise, note that the ±200V range requires VS of ±15V; lower supplies reduce the usable common-mode window. Reference pins should be driven from a low-impedance source to preserve CMRR.
This page synthesizes distributor pricing, drop-in alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet.
Аналоги без доработки для INA117KU — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с INA117KU (тот же форм-фактор и посадочное место) — отличается по Bandwidth, Package, Mounting Type, Operating Temperature Range, Amplifier Type.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
INA149U
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
INA117KU/2K5
✅ Прямая замена✓ В наличии
$2.55 / шт.
Открыть даташит →AD629ARZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
AD8479ARZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
INA117U
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
INA117KU Максимальные параметры и электрические характеристики
| Функция | Precision unity-gain difference amplifier |
| Common-Mode Input Range | ±200 V (VS = ±15 V) |
| Overload Protection (Common-Mode) | ±500 V |
| Overload Protection (Differential) | ±500 V |
| Gain | 1 V/V (unity) |
| Gain Error | 0.02% max |
| Nonlinearity | 0.001% max |
| CMRR | 86 dB min |
| Offset Voltage | 1000 uV max |
| Bandwidth | 0.2 MHz |
| Architecture | Precision op amp + integrated thin-film resistor network |
| Напряжение питания | ±15 V (nominal) |
| Диапазон рабочих температур | -40°C to +85°C |
| Корпус | 8-SOIC (surface mount) |
| Тип монтажа | Surface Mount |
| Статус RoHS | Compliant |
Конфигурация выводов INA117KU
| Контакт 1 | V+ — Positive supply (nominal +15 V) |
| Контакт 2 | IN- — Inverting input (differential signal) |
| Контакт 3 | IN+ — Non-inverting input (differential signal) |
| Контакт 4 | REF — Reference pin - drive with low-impedance source to set output offset |
| Контакт 5 | VOUT — Amplifier output, unity gain |
| Контакт 6 | V- — Negative supply (nominal -15 V) |
| Контакт 7 | NC — Not connected |
| Контакт 8 | NC — Not connected |
Типичное применение
INA117KU подходит для 6 применениеs: High-Side Current Sensing, Industrial Motor Drive Voltage Monitoring, Test and Measurement Input Conditioning, Level Shifting for ADC Inputs, Battery Management and Cell Monitoring, Analog Multiplexed Signal Acquisition.
High-Side Current Sensing
The INA117KU's ±200V common-mode input range makes it a natural fit for high-side shunt current sensing on industrial bus rails up to 200V. The shunt sits directly in the high-voltage path, with the amplifier's IN+ and IN- pins strapped across it; the on-chip thin-film resistor network rejects the large rail voltage while amplifying only the millivolt-level shunt signal at unity gain. With 0.02% max gain error and 86 dB minimum CMRR, measurement accuracy is dominated by the shunt tolerance rather than the amplifier. The REF pin lets you offset the output into a unipolar ADC range. Place the INA117KU close to the shunt and keep the reference drive low-impedance to preserve CMRR at full common-mode.
Рекомендуется
Industrial Motor Drive Voltage Monitoring
In motor drives and inverter systems, DC bus voltages and phase-leg nodes swing far above the logic domain. The INA117KU measures these high-voltage nodes directly, dividing down the common-mode content internally and delivering a ground-referenced, unity-gain replica of the differential signal to the controller ADC. Its ±500V common-mode and differential input protection gives robustness against switching transients and fault events common in traction and servo drives. The 0.2 MHz bandwidth supports monitoring of bus ripple and low-frequency modulation phenomena, while 0.001% max nonlinearity keeps harmonic distortion out of diagnostics. Use the INA117KU for bus-voltage feedback in 200V-class drives; move to AD8479 for 600V-class systems.
Рекомендуется
Test and Measurement Input Conditioning
Bench instruments, data acquisition front ends, and oscilloscope-like probes frequently must accept signals with large DC offsets riding on small differential content. The INA117KU conditions such inputs by subtracting the common-mode component up to ±200V and passing the differential content through with 0.02% gain error and 0.001% nonlinearity — figures sufficient for 13-14 effective bits of fidelity. The thin-film resistor network's temperature-stable ratio tracking means the instrument's accuracy holds across the -40°C to +85°C industrial range without calibration drift typical of discrete resistor dividers. Input protection to ±500V shields the front end from operator misconnection, reducing warranty failures in fielded test equipment.
Рекомендуется
Level Shifting for ADC Inputs
When a sensor or process signal rides on a high common-mode potential, the INA117KU shifts it down to the ADC's low-voltage input range in a single stage. The differential signal is preserved at unity gain while the common-mode — up to ±200V — is rejected by the internal resistor network, and the REF pin sets the ADC-mid-scale bias point. Compared to discrete resistor-divider plus op amp solutions, the monolithic approach eliminates ratio-matching errors and their temperature drift, achieving 86 dB min CMRR without component selection labor. Buffer the REF pin with a low-offset op amp such as the OPA2277, and keep the source impedance at each INA117 input low so bias currents do not add offset error.
Рекомендуется
Battery Management and Cell Monitoring
Stacked battery strings in UPS systems, telecom plants, and energy storage racks create series-stacked cell voltages well beyond conventional amplifier limits. The INA117KU measures individual cell or block voltages relative to a lower node because its inputs tolerate ±200V common-mode — enough for 40+ lead-acid cell blocks. The ±500V protection rating tolerates charge/discharge transients and connector faults. Unity gain with 0.02% error supports the percent-level state-of-charge estimation accuracy these systems need, while its bipolar supply operation fits the classic stack-monitor architecture where a local isolated supply provides ±15V rails. For lithium stacks exceeding 200V per monitored section, choose the AD8479 with its ±600V range.
Рекомендуется
Analog Multiplexed Signal Acquisition
Multi-channel acquisition systems scanning high-voltage sources — heater elements, solenoid rails, plate supplies — can route each channel to a shared INA117KU after an analog multiplexer. Because the INA117 presents its inputs through the internal resistor network, the multiplexer's on-resistance and charge injection see a forgiving load, and the amplifier's 0.001% max nonlinearity ensures channel-to-channel consistency critical for calibrated multi-point measurements. Settling after multiplexer switching is governed by the 0.2 MHz bandwidth: allow several microseconds per channel for full-accuracy sampling. Common-mode up to ±200V is rejected on every channel regardless of which source is selected, eliminating per-channel attenuator circuits and their matching burden.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для INA117KU — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | INA149U | AD629ARZ | AD8479ARZ |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Brand | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| Common-Mode Input Range | ±200 V | ±275 V | ±270 V | ±600 V |
Ключевые отличия
- Lower precision-part cost point in family (против INA149U)
- Symmetric ±200V bipolar common-mode range (против AD629ARZ)
- Precision thin-film accuracy class (против AD8479ARZ)
Заметки по проектированию
Never leave the REF pin connected through a resistor divider or long trace. The INA117's CMRR of 86 dB min depends on a low-impedance reference drive; resistance in the REF path unbalances the internal thin-film ratio and converts reference impedance directly into gain and CMRR error. Use an op amp buffer (e.g., OPA2277) or a dedicated precision reference to drive REF, and decouple it with 0.1 uF close to the pin.
The ±200V common-mode range is specified at VS = ±15V per the TI datasheet. Operating from reduced supplies (e.g., ±12V) proportionally shrinks the usable common-mode window, and exceeding the window drives internal nodes into saturation with misleading output. Always verify worst-case bus voltage plus ripple and transient headroom against the supply condition. The ±500V input protection ratings apply to transient overload, not continuous operation — derate accordingly for fault scenarios.
Keep the differential input traces (pins 2 and 3) short, matched in length, and routed away from switching nodes. Place a 0.1 uF ceramic capacitor within 2 mm of each supply pin (1 and 6) to a solid ground. Although the inputs are protected to ±500V, adding series resistors (e.g., 10 kOhm) at IN+/IN- costs no accuracy at unity gain thanks to the high input impedance topology and adds robust ESD and surge margin in industrial environments.
Информация о соответствии
RoHS compliant per distributor listings. AEC-Q100 qualification not indicated in provided data; INA117 is specified for -40°C to +85°C industrial range.
