INA125UA - Precision Bridge Instrumentation Amplifier | TI
MPN: INA125UA ✓ فعالINA125UA نمای کلی
An instrumentation amplifier is a specialized analog signal-conditioning IC designed to amplify small differential voltages while rejecting common-mode interference. Its functional hierarchy is instrumentation amplifier, differential amplifier, analog front end, and signal-conditioning IC. This device is particularly useful when a sensor produces a small differential output and the measurement environment contains noise, ground-potential differences, or substantial common-mode voltage.
The INA125UA combines differential-input amplification, adjustable gain, bridge excitation, and a precision voltage reference in one package. Its gain range of 4 to 10,000 V/V allows the same device family to serve strain-gauge, pressure-sensor, and resistive-bridge systems. The single-resistor gain-setting arrangement simplifies calibration and reduces the number of external components required for many precision measurement circuits.
The device is laser-trimmed for accuracy, and the family operates across a supply range of 2.7 V to 36 V. The INA125UA ordering option is supplied in a 16-pin SOIC package for surface-mount assembly. The integrated reference can support excitation or output-referencing requirements where an external precision reference would otherwise increase component count and introduce another error source.
Typical uses include strain-gauge load cells, resistive pressure and temperature sensors, current-shunt instrumentation, industrial process monitoring, and precision laboratory measurement systems. It is especially appropriate when differential signal integrity, adjustable gain, and integrated bridge excitation are needed within one analog front end. The wide supply range also allows operation from low-voltage portable systems through higher-voltage industrial measurement equipment.
Designers should follow the TI datasheet for the exact gain-resistor equation, reference-output behavior, input and output range, supply decoupling, and common-mode limitations. Place bypass capacitors close to the supply pins, keep sensitive differential routes compact and symmetric, and verify that transducer excitation, input common-mode voltage, output swing, and gain remain within their permitted operating limits.
This page organizes the INA125UA specifications, pin package, application guidance, comparison parameters, and drop-in alternatives. It also identifies the engineering trade-offs between same-footprint family members and provides sourcing workflows for price, availability, and lead-time requests.
جایگزین‌های drop-in برای INA125UA — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای INA125UA (همان فرم‌فاکتور و فوت‌پرینت).
INA125U
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←INA125UE4
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
INA125UA حداکثر مقادیر مجاز و مشخصات الکتریکی
| Product Type | Instrumentation amplifier with precision voltage reference |
| Number of Channels | 1 circuit |
| Gain Range | 4 V/V to 10,000 V/V |
| Gain Setting Method | 1 external resistor |
| Supply Voltage Range | 2.7 V to 36 V |
| Maximum Input Offset Voltage | 250 uV |
| Input Type | Differential input |
| Reference | Integrated precision voltage reference |
| Bridge Excitation | Integrated bridge excitation |
| Trim Method | Laser trimmed |
| بسته‌بندی | 16-pin SOIC |
| نوع نصب | Surface mount |
| Maximum Supply Voltage | 36 V |
| Minimum Supply Voltage | 2.7 V |
راهنمای پیکربندی پین INA125UA 16-pin soic
پیکربندی پین برای INA125UA (پکیج 16-pin soic). این قطعه آنالوگ دارای پین‌های ورودی، خروجی و تغذیه است. برای پیکربندی‌های پین offset null، جبران‌سازی و فعال‌سازی به دیتاشیت سازنده مراجعه کنید. ایده‌آل برای مدارهای شرطی‌سازی سیگنال و تقویت‌کننده.
داده پین‌آوت تفصیلی موجود نیست برای INA125UA.
به دیتاشیت برای پیکربندی کامل پین‌ها.
کاربردهای معمول
INA125UA مناسب است برای 6 کاربردs: Strain-Gauge Load Cell Measurement, Resistive Pressure Sensor Conditioning, Industrial Process Sensing, Precision Current-Shunt Measurement, Precision Test and Measurement, Portable Sensor Interfaces.
Strain-Gauge Load Cell Measurement
The INA125UA fits strain-gauge load-cell front ends because it combines a differential instrumentation-amplifier channel, integrated bridge excitation, and a precision voltage reference in one 16-pin SOIC. Its externally set gain covers 4 to 10,000 V/V, allowing the same amplifier architecture to address different bridge sensitivities and mechanical test ranges. Place the device close to the bridge inputs, use the datasheet gain equation, and verify that excitation voltage, common-mode level, and output swing remain within the operating limits.
پیشنهادی
Resistive Pressure Sensor Conditioning
The INA125UA is appropriate for resistive pressure elements that produce a small differential bridge signal while rejecting common-mode voltage. Integrated bridge excitation removes the need for a separate excitation source in suitable designs, while the integrated precision reference supports stable ratiometric measurements. Its 4 to 10,000 V/V programmable range provides flexibility for different pressure-sensor sensitivities. Validate the sensor excitation requirements, input common-mode range, gain accuracy, and output-headroom limits during design-in.
پیشنهادی
Industrial Process Sensing
The INA125UA can serve as the analog front end for industrial sensors whose useful information is represented by a small differential voltage. Its single-channel instrumentation architecture, integrated reference, and bridge excitation reduce the number of separate precision analog components. The 2.7 V to 36 V family supply range supports both compact low-voltage electronics and higher-voltage measurement systems. At the board level, use short differential routing, a controlled reference path, and supply bypassing close to the device to preserve measurement quality.
پیشنهادی
Precision Current-Shunt Measurement
The INA125UA is suitable for current-shunt monitoring when the shunt voltage is small and must be measured differentially in the presence of a larger common-mode potential. The instrumentation-amplifier configuration supports gain selection from 4 to 10,000 V/V, while the integrated precision reference can support excitation and output-referencing arrangements. Select the gain to keep the shunt signal within the output range, and check the allowable common-mode voltage against the actual measurement node. Kelvin routing at the shunt improves practical measurement accuracy.
پیشنهادی
Precision Test and Measurement
The INA125UA fits laboratory and test systems that amplify low-level differential transducer signals while requiring stable excitation and referencing. A single external resistor programs gain from 4 to 10,000 V/V, simplifying front-end configuration across different test ranges. The integrated reference and bridge excitation can reduce external analog hardware, but the final gain, common-mode, and output limits must be checked for each fixture. Short traces, grounded guarding, and careful supply decoupling are important when the measured signal is small.
پیشنهادی
Portable Sensor Interfaces
The INA125UA is appropriate for compact, battery-powered sensor interfaces that need differential measurement and adjustable amplification without a separate bridge-excitation circuit. Its low-power architecture and 2.7 V minimum family supply voltage support low-voltage portable systems, while the broad 36 V maximum supply supports higher-voltage industrial variants of the same design family. The bridge excitation and reference outputs must be configured according to the datasheet, and total current consumption should be checked with sensor and interface loads included.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای INA125UA — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | INA125U | INA125UE4 |
|---|---|---|---|
| Package | 16-pin SOIC | 16-pin SOIC - same footprint | 16-pin SOIC - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Instrumentation amplifier with precision voltage reference | Instrumentation amplifier with precision voltage reference | Instrumentation amplifier with precision voltage reference |
| Channel Count | 1 circuit | 1 circuit | 1 circuit |
| Gain Range | 4 V/V to 10,000 V/V | 4 V/V to 10,000 V/V | 4 V/V to 10,000 V/V |
| Special Feature | Integrated bridge excitation and precision reference | Integrated bridge excitation and precision reference | Integrated bridge excitation and precision reference |
تفاوت‌های کلیدی
- Integrated bridge measurement signal chain (در مقابلINA125U)
- Single-resistor gain programming (در مقابلINA125UE4)
- Compact surface-mount integration (در مقابلINA125U)
یادداشت‌های طراحی
Place the supply-bypass capacitors directly beside the INA125UA supply and ground pins, using the manufacturer layout recommendations as the starting point. Keep the gain-setting resistor close to its corresponding pin to minimize sensitive-node pickup. Route the two differential inputs together with matched geometry and avoid placing switching-current paths beneath the input, reference, or output nodes.
Treat the differential input pair as a matched high-impedance network. Minimize loop area, keep both traces away from clocks, power inductors, and relay return paths, and use a quiet ground reference for the analog return. For bridge sensors, route the excitation and sense conductors together where practical so that cable pickup and common-mode disturbance remain balanced.
Do not select gain solely from the sensor's nominal sensitivity. Before finalizing the gain-setting resistor, verify input common-mode voltage, output swing, reference and excitation loading, and the usable output range. Also compare the UA suffix against other INA125 orderable rows because Texas Instruments identifies slight electrical variations within the family even when the packages are identical.
اطلاعات انطباق
The manufacturer and distributor excerpts do not establish the individual compliance fields. Verify RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals status against the current orderable-part record and manufacturer documentation.