INA101KU - High Accuracy Instrumentation Amp | Texas Instruments
部品番号: INA101KU ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.95 | $89.50 |
| 100 | $8.2 | $820.00 |
| 500 | $7.6 | $3,800.00 |
| 1,000 | $6.95 | $6,950.00 |
INA101KU 概要
An instrumentation amplifier is a specialized differential amplifier designed to amplify small sensor signals while rejecting common-mode noise. It sits at the front end of the signal chain hierarchy: sensor -> instrumentation amplifier -> filter -> ADC. Unlike a standard op amp, an instrumentation amplifier provides a user-set gain via a single external resistor, extremely high common-mode rejection (CMR at 60 Hz), very high input impedance, and matched, high-impedance differential inputs, making it the standard choice for precision bridge and transducer readout.
Key features of the INA101KU include 13 nV/Hz input-referred voltage noise, high common-mode rejection at 60 Hz (targeted at 50/60 Hz line-noise rejection), input impedance of 10^10 ohm, and a classic three-amplifier topology on a single monolithic die. These parameters directly improve system accuracy: the 25 uV offset and 0.25 uV/C drift eliminate the need for external offset trimming in most strain-gage applications, and 0.002% nonlinearity preserves end-to-end measurement integrity over a wide gain range.
Architecturally, the INA101 uses three internally compensated amplifiers configured as a classic two-stage instrumentation amplifier, with gain set by one external resistor RG (G = 1 + 40 kOhm/RG). It operates from dual supplies of +/-5 V to +/-20 V with a slew rate of 0.4 V/uS and a bandwidth of approximately 25 kHz, sufficient for static and low-frequency dynamic measurements.
Typical applications include strain-gage bridge amplifiers, thermocouple and RTD conditioning, weigh scales, low-level data acquisition front ends, and medical transducer interfaces where microvolt-level signals must be amplified in electrically noisy environments.
Design consideration: at high gains, keep the gain resistor RG traces short and use a low-drift, low-TCR resistor, since RG mismatch and self-heating directly degrade gain accuracy and drift.
This page synthesizes distributor pricing, drop-in alternatives, cross-reference data, and practical design notes not consolidated in the manufacturer datasheet.
ドロップイン代替品: INA101KU — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: INA101KU （同一形状・フットプリント） — 相違点: Gain Setting, Input Impedance, Package.
クイック比較ツール — 並列比較する代替部品を選択:
INA101KU/1K
✅ ドロップイン✓ 在庫あり
$23 / 個
データシートを見る →AD524ARZ-16
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA103KU
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA101KU 最大定格＆電気的特性
| Amplifier Type | Instrumentation Amplifier |
| Number of Circuits | 1 |
| Internal Topology | 3-amplifier (three op amp) architecture |
| Input Offset Voltage | 25 uV max |
| Offset Voltage Drift | 0.25 uV/C max |
| Nonlinearity | 0.002% max |
| Input Voltage Noise | 13 nV/Hz |
| Common-Mode Rejection | High CMR at 60 Hz |
| Input Impedance | 10^10 ohm |
| Supply Voltage Range | +/-5 V to +/-20 V |
| Slew Rate | 0.4 V/uS |
| Bandwidth | 25 kHz |
| Gain Setting | Single external resistor RG |
| パッケージ | 16-SOIC (DW / SOL-16) |
| 実装タイプ | Surface Mount |
INA101KU 16-soic (dw / sol-16) ピン配置ガイド
INA101KU (16-soic (dw / sol-16) パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: INA101KU.
詳細は データシート をご参照ください。
主な用途
INA101KU の用途: 6 件s: Strain Gage Bridge Amplifier, Thermocouple and RTD Conditioning, Weigh Scales and Load Cells, Precision Data Acquisition Front End, Medical Transducer Interfaces, Industrial Process Signal Conditioning.
Strain Gage Bridge Amplifier
The INA101KU is a primary recommended amplifier for strain-gage bridge readout. Metal-foil strain gage bridges produce full-scale outputs of only a few millivolts per volt of excitation, and the INA101KU's 25 uV max offset, 0.25 uV/C drift, and 0.002% nonlinearity preserve those microvolt signals without manual calibration. Its 10^10 ohm input impedance prevents bridge loading, and high CMR at 60 Hz rejects mains pickup on long bridge wiring. Place the amplifier close to the bridge, use a low-TCR gain resistor, and add RFI filtering on the inputs; the 13 nV/Hz noise supports resolution of microvolt-level bridge changes in weigh scales and structural load monitoring.
おすすめ
Thermocouple and RTD Conditioning
Thermocouples generate tens of microvolts per degree C, so amplifier offset and drift directly become temperature error. The INA101KU's 25 uV max offset and 0.25 uV/C max drift make it well suited to thermocouple front ends where a cold-junction-compensated signal is amplified at moderate gain. Its high input impedance allows large input filter resistors for burnout detection and RFI rejection without introducing significant offset error from bias current. In RTD bridge configurations, the 0.002% nonlinearity preserves measurement integrity across the span. Set gain with a single low-drift resistor; digitize the output with a precision ADC such as the CS5532 for a complete low-level analog front end.
おすすめ
Weigh Scales and Load Cells
Load cells are strain-gage bridges excited at 5-10 V, producing 2 mV/V full scale. The INA101KU amplifies this with sufficient accuracy for commercial weighing: 0.002% nonlinearity supports high count-per-division resolution, and the 25 uV offset keeps zero-balance error negligible relative to a 10-20 mV full-scale signal. The 25 kHz bandwidth is far beyond mechanical settling time of the load cell, so the amplifier does not limit response. High CMR at 60 Hz counters mains interference from nearby powered equipment. Combine with a precision excitation reference and a delta-sigma ADC with ratiometric measurement to cancel excitation drift entirely.
おすすめ
Precision Data Acquisition Front End
In multi-channel industrial data acquisition, low-level transducer signals travel long distances to the digitizer. The INA101KU serves as the per-channel differential front end: its 10^10 ohm inputs permit anti-alias and RCI filter networks, high CMR suppresses ground-potential differences and 50/60 Hz pickup, and DC accuracy of 25 uV offset with 0.002% nonlinearity preserves system-level accuracy over +/-5 V to +/-20 V supplies. The 0.4 V/uS slew rate and 25 kHz bandwidth suit low-frequency industrial monitoring. Program per-channel gain with a single resistor or a relay/mux-selected gain resistor bank for programmable-gain front ends feeding multiplexed ADCs.
おすすめ
Medical Transducer Interfaces
Medical sensors such as pressure transducers and bio-potential bridge sensors demand high accuracy, high input impedance, and strong mains rejection. The INA101KU's 10^10 ohm input impedance avoids loading high-impedance electrodes and transducers, its 13 nV/Hz noise floor resolves microvolt signals, and high CMR at 60 Hz suppresses power-line interference critical in patient-connected equipment. Designers must comply with applicable patient-isolation standards by placing the amplifier inside the isolated section, using isolated power and isolated data coupling downstream. Verify regulatory requirements for the end equipment; the datasheet explicitly disclaims life-support use without additional qualification.
おすすめ
Industrial Process Signal Conditioning
Process transducers (pressure, flow, level) frequently output millivolt-level differential signals riding on large common-mode voltages in electrically noisy plants. The INA101KU amplifies these differentially with high CMR at 60 Hz, rejecting ground-loop and mains interference, and its wide +/-20 V supply range accommodates rugged industrial analog rails. Its very high input impedance supports protective input networks with series resistors and clamps without degrading accuracy. The part's 0.002% nonlinearity maintains calibration over the process span, reducing recalibration intervals. Follow with an ADC or a voltage-to-current converter for 4-20 mA transmission to the control room.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: INA101KU — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | INA101KU/1K | AD524ARZ-16 | INA103KU |
|---|---|---|---|---|
| Package | 16-SOIC (DW / SOL-16) | 16-SOIC (DW) - same | 16-SOIC - same | 16-SOIC (DW) - same |
| Brand | Texas Instruments | Texas Instruments | Analog Devices | Texas Instruments |
主な差別化要因
- Very high DC accuracy for bridge readout （vs INA103KU)
- Low input noise for microvolt signals （vs AD524ARZ-16)
- High input impedance without bridge loading （vs INA117KU)
設計ノート
Route the gain-setting resistor RG with the shortest possible traces and use a low-TCR (e.g., 25 ppm/C or better) precision resistor. In the classic three-amp topology, RG drop defines gain, so any RG self-heating or thermal EMF in its connections appears directly as gain error and output drift - especially damaging at high gains where RG values are small. Keep the RG node away from switching or digital traces and guard it if the board carries microvolt-level signals.
With 10^10 ohm input impedance and 13 nV/Hz noise, input network resistance contributes both offset and noise. Estimated: 10 kOhm of series input resistance with typical bias current can add measurable offset error, and resistor thermal noise of 1 kOhm is about 4 nV/Hz - comparable to the amplifier noise floor. Keep input series resistors under a few kOhm unless filtering demands otherwise, and prefer differential RC filters matched between the two inputs so common-mode filtering stays balanced.
For transducer wiring longer than a few meters in industrial environments, add RFI input filtering (small series resistors plus capacitors to ground at each input, before the amplifier pins) because RF rectification at the input stage can appear as DC offset shift. The high CMR at 60 Hz rejects mains pickup differentially, but only if the source impedances seen by both inputs are balanced - mismatched filter resistors convert common-mode hum into differential error.
The INA101KU runs from +/-5 V to +/-20 V dual rails. Decouple both supplies with 0.1 uF ceramics placed close to the supply pins, plus bulk capacitance per board. Note that with +/-20 V rails the device can dissipate significant power at high output current into light loads; verify junction temperature for your worst-case supply and load combination using the SOIC-16 thermal data in the manufacturer datasheet.
コンプライアンス情報
Compliance status varies by ordering suffix within the legacy INA101 family. Verify RoHS/REACH status for the exact INA101KU suffix on the official TI product page (ti.com/product/INA101) environmental data section.
