INA111BU - 2 MHz FET-Input Instrumentation Amplifier | Texas Instruments
MPN: INA111BU ✓ פעילINA111BU סקירה
An instrumentation amplifier is a specialized analog amplifier designed to amplify small differential signals while rejecting common-mode noise and interference. Its typical signal path includes input buffers, a differential amplifier stage, and gain-setting elements. This three-op-amp topology belongs to the broader operational-amplifier hierarchy and is commonly used where sensor outputs, sensor inputs, and instrumentation need accurate differential measurement without excessive front-end complexity.
The INA111BU uses FET inputs to reduce input bias current to less than 20 pA. This low-bias-current characteristic simplifies input filtering and limits circuitry around high-impedance sources. Its 2 MHz bandwidth supports higher-bandwidth measurement than precision-only instrumentation amplifiers, while the 17 V/us slew rate helps preserve large-signal response when operating at higher gains. The specified 106 dB CMRR supports effective rejection of common-mode voltage in industrial and test environments.
The device accepts a 6 V to 18 V supply range and is specified from -40 C to +85 C. The 16-pin SOIC package provides a practical surface-mount option for acquisition boards, process-control equipment, medical instrumentation, and laboratory measurement systems. Pin assignments and recommended gain-setting component values should be taken directly from the pin-description and application circuits in the manufacturer datasheet.
INA111BU is suited to bridge sensors, current shunts, precision current measurement, and low-level differential signal acquisition. The principal design trade-off is the relationship between closed-loop gain, bandwidth, output swing, and input common-mode range. Designers should confirm those limits for the intended gain and supply voltage before committing the PCB layout.
This page combines the manufacturer product information with a structured technical comparison, practical design notes, verified source links, and identified replacement constraints. Use the Request a Quote form on this page for current commercial availability, lot-specific packaging, and sourcing requirements.
חלופות תחליף ישיר עבור INA111BU — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם INA111BU (אותו גורם צורה וטביעת רגל) — שונים ב Product Type, Supply Voltage Range, Package, Slew Rate, Architecture.
INA111BUE4
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
INA114BU
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←INA114AUE4
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
INA111BU דירוגים מרביים ומאפיינים חשמליים
| Product Type | Instrumentation amplifier |
| Number of Amplifiers | 1 circuit |
| Input Transistor Type | FET-input |
| Gain-Bandwidth Product | 2 MHz |
| Slew Rate | 17 V/us |
| Common-Mode Rejection Ratio | 106 dB |
| Input Bias Current | Less than 20 pA |
| Supply Voltage Range | 6 V to 18 V |
| Maximum Supply Voltage | 18 V |
| טווח טמפרטורת פעולה | -40 C to +85 C |
| מארז | 16-pin SOIC |
| סוג הרכבה | Surface mount |
| AEC-Q100 Qualification | Not applicable |
מדריך תצורת פינים של INA111BU 16-pin soic
תצורת פינים עבור INA111BU (מארזת 16-pin soic). רכיב אנלוגי זה כולל פיני כניסה, יציאה ואספקת מתח. יש לעיין בגיליון הנתונים של היצרן לתצורות פיני איפוס היסט, פיצוי והפעלה. אידיאלי למעגלי עיצוב אותות ומגברים.
אין נתוני פריסת פינים מפורטים עבור INA111BU.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
INA111BU מתאים עבור 6 יישוםs: Bridge Sensor Signal Conditioning, Shunt-Based Current Measurement, Precision Data Acquisition, Laboratory Instrumentation, Process Control Monitoring, Medical Signal Acquisition.
Bridge Sensor Signal Conditioning
The INA111BU fits differential bridge measurements where small sensor outputs must be amplified in the presence of a larger common-mode voltage. Its FET inputs draw less than 20 pA of bias current, reducing disturbance of high-impedance sensor networks, while the 2 MHz gain-bandwidth product and 17 V/us slew rate provide headroom for moderately fast excitation and measurement waveforms. The 106 dB CMRR supports rejection of common-mode noise at the bridge output. Designers should still verify the bridge excitation range, sensor output impedance, INA111BU input common-mode limits, and the output swing at the selected gain. Place the instrumentation amplifier close to the sensor connector, keep differential input traces tightly coupled, and provide a clean ground reference to avoid converting common-mode interference into differential error.
מומלץ
Shunt-Based Current Measurement
The INA111BU is appropriate for measuring the differential voltage generated by a current shunt when the shunt voltage is small relative to its common-mode potential. Its less-than-20-pA input bias current limits error in the measurement path, and the 106 dB CMRR helps separate the shunt differential signal from supply and ground disturbances. The 2 MHz bandwidth allows the amplifier to handle faster current transients than a precision-only instrumentation amplifier, while the 17 V/us slew rate supports larger output excursions. The shunt resistance, amplifier gain, and amplifier supply must be selected together so that output swing remains within the device limits. Kelvin-style routing from the shunt contacts is recommended to reduce voltage drops caused by PCB and connector resistance.
מומלץ
Precision Data Acquisition
The INA111BU can serve as the analog front end of a precision data-acquisition channel when the target signal requires both low input bias current and more bandwidth than a conventional precision instrumentation amplifier. Its single-channel FET-input topology is useful ahead of an ADC, while the 2 MHz gain-bandwidth product and 17 V/us slew rate provide useful dynamics for sensor, waveform, and industrial-control signals. The system designer must determine the gain from the maximum input level, then confirm that the resulting bandwidth and settling behavior are adequate for the ADC conversion rate. Use a single ground reference around the analog section, keep the amplifier output path short, and isolate digital return currents from sensitive input nodes. Reference-design components should be selected from the manufacturer application guidance.
מומלץ
Laboratory Instrumentation
The INA111BU is well suited to laboratory measurement equipment that must amplify low-level differential sensor signals while rejecting common-mode noise generated by bench power supplies and surrounding equipment. The less-than-20-pA bias current is beneficial with high-impedance sources and long filter networks, while the 2 MHz bandwidth supports signal capture beyond slow DC-only amplifier performance. For instrument front ends, the gain-setting network should be placed close to the amplifier, while input and output filtering should be designed around the desired measurement bandwidth. Guard traces and a low-impedance analog ground plane can improve common-mode rejection in high-gain systems. Validate offset, noise, settling, and common-mode behavior on the final board because enclosure grounding and cable routing can materially affect measured performance.
מומלץ
Process Control Monitoring
The INA111BU can condition low-level differential process signals in industrial monitoring systems where sensor leads share ground potential with substantial common-mode voltage. Its 106 dB CMRR helps reject common-mode disturbance, while the FET-input bias current below 20 pA minimizes loading of sensitive bridges and high-impedance transducers. The 2 MHz bandwidth and 17 V/us slew rate are useful for control loops or monitoring channels with transient content beyond a purely DC response. The amplifier should be located near the field-side connector, with input routing designed as a differential pair and ground arranged to avoid sharing paths with pumps, relays, and switching converters. Verify industrial temperature requirements, transient immunity, surge protection, and fail-safe behavior at the system level before using the component as the sole protection element.
מומלץ
Medical Signal Acquisition
The INA111BU can amplify low-level differential physiological or diagnostic sensor signals when the acquisition system requires low bias current and a modest increase in bandwidth. The less-than-20-pA input bias current reduces errors with high-impedance sensing elements, while the 106 dB CMRR supports rejection of common-mode pickup from cables and surrounding equipment. The 2 MHz bandwidth can accommodate sensor dynamics that are faster than DC-only instrumentation amplifiers, subject to noise and isolation requirements. Medical use requires system-level evaluation of leakage current, patient protection, isolation, electromagnetic immunity, and applicable quality processes; the component itself does not establish compliance for a finished medical device. Use the manufacturer application guidance for input networks, and validate the complete acquisition chain for motion artifacts, noise, saturation, and recovery after stimulus events.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור INA111BU — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | INA111BUE4 | INA114BU | INA114AUE4 |
|---|---|---|---|---|
| Package | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC | 16-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | High-speed FET-input instrumentation amplifier | Instrumentation amplifier | Precision instrumentation amplifier | Precision instrumentation amplifier |
| Number of Amplifiers | 1 circuit | 1 amplifier | 1 amplifier | 1 amplifier |
| Gain Configuration | External gain-setting resistor | External gain-setting resistor | Single external resistor, gain up to 10000 | Single external resistor, gain up to 10000 |
מבדילים עיקריים
- High-speed instrumentation-amplifier performance (לעומתINA114BU)
- Very low FET-input bias current (לעומתINA114AUE4)
- Direct same-family ordering alternative (לעומתINA111BUE4)
הערות תכנון
Route the two INA111BU inputs as a closely coupled differential pair from the source or shunt, and connect their returns to a quiet analog-ground region. Avoid placing the input pair beneath switching regulators, relays, digital clock lines, or other high-current paths. Keep the gain-setting resistor close to the appropriate device pin, and verify the final placement against the manufacturer application layout.
Do not select gain from the 2 MHz gain-bandwidth figure alone. Increasing closed-loop gain reduces usable bandwidth and may increase output-noise contribution. Check the input common-mode range, output voltage swing, supply headroom, and slew-rate requirement for the worst operating condition. The INA111BU's 17 V/us slew rate is meaningful only if the selected output amplitude and frequency remain within those limits.
For high-impedance sources, minimize leakage through contaminated boards, long exposed traces, and input protection networks. The INA111BU's less-than-20-pA bias current helps, but guarding and clean assembly practices remain necessary. Use short inputs, clean connector materials, and appropriate filtering derived from the source impedance and target signal bandwidth. Confirm that added capacitance does not create an unintended input pole or degrade settling.
מידע על תאימות
The accessible product information does not state component-specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because this is a general-purpose analog amplifier rather than an automotive-qualified device.