OPA124U - Precision Low-Noise DiFET Op Amp | Texas Instruments
MPN: OPA124U ✗ پایان تولیدOPA124U نمای کلی
An operational amplifier is a voltage-controlled differential amplifier that uses feedback to amplify the voltage difference between its non-inverting and inverting inputs. Within the broader integrated-circuit hierarchy, an operational amplifier belongs to the amplifier IC family and, more specifically, the precision analog signal-conditioning category. Its applications include closed-loop gain, impedance conversion, active filtering, current sensing, instrumentation, and precision control.
The OPA124U combines several low-noise precision characteristics. Its maximum input offset voltage is 250 µV, maximum input offset drift is 2 µV/°C, and minimum open-loop gain is 120 dB. Minimum common-mode rejection is 100 dB. The very low input bias current is particularly useful when the source impedance is high, because it reduces the voltage error created by bias current flowing through that impedance.
Texas Instruments describes the OPA124 family as a low-noise precision DiFET operational amplifier. The OPA124U is the 8-pin SOIC configuration, and the available manufacturer-hosted datasheet states that offset-adjust capability was removed from the SOIC versions. The substrate connection and guard-trace arrangement require careful review because board leakage can otherwise undermine the benefit of the device’s low input bias current.
Typical uses include precision current measurement, low-level sensor amplification, analog filtering, impedance buffering, laboratory instrumentation, and control systems. The 1.5 MHz gain-bandwidth product supports applications up to the amplifier’s practical frequency limit, while the 1.6 V/µs slew rate helps preserve large-signal behavior. Because the verified data does not provide complete supply-voltage, common-mode-voltage, output-current, or noise-density limits, those values should be confirmed in the manufacturer datasheet before design release.
For a new PCB, provide a low-leakage input layout with guarded traces, adequate input-bias return paths, and decoupling close to the supply pins. When upgrading an existing design, verify pin 8 substrate handling, common-mode range, supply voltage, offset limits, and stability against the selected feedback network. This page combines verified manufacturer and distributor information with package, replacement, and engineering guidance intended to reduce replacement risk.
This information page synthesizes verified distributor availability, manufacturer datasheet findings, drop-in candidate guidance, and practical design notes for engineers evaluating the OPA124U in precision analog circuits. It does not replace the complete Texas Instruments datasheet for production qualification or safety-critical design review.
جایگزین‌های drop-in برای OPA124U — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
OPA129U
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←OPA129UB
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
OPA191
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
OPA196
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
LMP7701
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
OPA124U حداکثر مقادیر مجاز و مشخصات الکتریکی
| Amplifier Type | Precision low-noise DiFET operational amplifier |
| Number of Channels | 1 circuit |
| Gain-Bandwidth Product | 1.5 MHz |
| Slew Rate | 1.6 V/µs |
| Maximum Input Bias Current | 5 pA |
| Maximum Input Offset Voltage | 250 µV |
| Maximum Input Offset Voltage Drift | 2 µV/°C |
| Minimum Open-Loop Gain | 120 dB |
| Minimum Common-Mode Rejection | 100 dB |
| بسته‌بندی | 8-pin SOIC |
| نوع نصب | Surface mount |
| Offset Adjustment | Not available on OPA124U SOIC version |
راهنمای پیکربندی پین OPA124U 8-pin soic
پیکربندی پین برای OPA124U (پکیج 8-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 OPA124U.
به دیتاشیت برای پیکربندی کامل پین‌ها.
کاربردهای معمول
OPA124U مناسب است برای 6 کاربردs: High-Impedance Sensor Signal Conditioning, Precision Current Sensing, Active Analog Filtering, Precision Instrumentation Buffering, Low-Level Voltage Amplification, Precision Control Loops.
High-Impedance Sensor Signal Conditioning
The OPA124U is appropriate for amplifying high-source-impedance sensor outputs because its maximum input bias current is 5 pA and the OPA124 family is described with 1 pA maximum bias current in the supplied feature listing. Low bias current limits the error voltage created when input current flows through a sensor or bias network. The 1.5 MHz gain-bandwidth product supports moderate-bandwidth measurements, while the 120 dB minimum open-loop gain and 100 dB minimum common-mode rejection support accurate closed-loop behavior. Use guarded PCB traces, clean input surfaces, and a suitable output range; confirm the complete common-mode and supply limits before final circuit release.
پیشنهادی
Precision Current Sensing
OPA124U can condition low-level shunt voltages where error from input offset and bias current would otherwise obscure the measured current. Confirmed specifications include a 250 µV maximum input offset voltage, 2 µV/°C maximum offset drift, 5 pA maximum input bias current, and 120 dB minimum open-loop gain. The 1.6 V/µs slew rate permits the amplifier to follow current steps without the timing limitation of a much slower precision amplifier. Engineers should check output swing and common-mode limits for the shunt topology, use Kelvin routing where possible, and avoid relying on an unverified specification for final production release.
پیشنهادی
Active Analog Filtering
OPA124U is suitable for moderate-frequency active filters built around precision resistors and capacitors, particularly when low input bias current and low offset are valuable. Its 1.5 MHz gain-bandwidth product provides bandwidth for signal shaping, while its 1.6 V/µs slew rate helps maintain large-signal response. The 250 µV maximum input offset and 2 µV/°C maximum drift can reduce DC error in low-frequency filter stages. Component tolerances, noise gain, and loop stability still determine practical filter performance, so simulate the complete network with the selected capacitor technology and verify the supply and common-mode constraints.
پیشنهادی
Precision Instrumentation Buffering
OPA124U can buffer laboratory, measurement, and control-system signals where source impedance would otherwise distort the measurement. Its maximum input bias current of 5 pA minimizes loading of high-impedance sensors, and the 100 dB minimum common-mode rejection improves rejection of common-mode disturbances. The 120 dB minimum open-loop gain supports accurate closed-loop operation, while the 1.5 MHz gain-bandwidth product covers many audio-band and industrial-control signals. Layout should use short guarded inputs, a single-point or carefully filtered reference return, and decoupling close to the pins. Verify the complete electrical limits in the manufacturer datasheet before production use.
پیشنهادی
Low-Level Voltage Amplification
OPA124U fits low-level voltage amplification when signal amplitudes are comparable to the amplifier’s 250 µV maximum offset specification. The small offset, 2 µV/°C maximum drift, and 5 pA maximum input bias current help preserve small signals, while 120 dB minimum open-loop gain supports accurate closed-loop gain. Its 1.5 MHz bandwidth is sufficient for many measurement-band applications, and the 1.6 V/µs slew rate provides additional large-signal margin. The circuit must still account for resistor noise, source impedance, output swing, and input common-mode limits. Avoid using the absence of a verified noise-density figure as proof of noise performance.
پیشنهادی
Precision Control Loops
OPA124U can be used in feedback-control paths requiring low offset, low drift, and very low input bias current. Its 1.5 MHz gain-bandwidth product is sufficient for many slow-to-moderate control loops, and the 1.6 V/µs slew rate limits large-signal delay in voltage-feedback designs. The 250 µV maximum input offset and 2 µV/°C maximum drift help reduce steady-state error as temperature changes. The SOIC version does not provide the offset adjustment available on some PDIP family members, so system calibration and resistor selection become more important. Confirm output drive, supply range, and stability with the complete feedback network before deployment.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای OPA124U — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | OPA129U | OPA129UB | OPA191 | OPA196 | LMP7701 |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
تفاوت‌های کلیدی
- Very low input bias current for precision measurement (در مقابلOPA191)
- Documented precision performance (در مقابلOPA129U)
- Moderate-bandwidth large-signal capability (در مقابلLMP7701)
یادداشت‌های طراحی
Keep the OPA124U input nodes short, isolated from high-impedance leakage paths, and surrounded by a grounded guard where practical. The verified family information describes exceptionally low input bias current, so contamination, solder flux residue, and damp board surfaces can create errors larger than the intended signal. Pin 8 is identified as the substrate connection and should follow the manufacturer guidance: connect it to a guard trace when available and otherwise to ground. The complete pin table must be checked in the Texas Instruments datasheet before layout release.
Do not assume that every 8-pin SOIC amplifier is a drop-in replacement. The supplied Texas Instruments support material specifically notes that newer amplifier inputs may draw several picoamperes rather than the OPA124 family’s 1 pA maximum and may omit offset-control functionality. OPA124U also lacks the SOIC offset-adjust capability found in some PDIP family members. Confirm pin assignments, input bias current, offset voltage and drift, common-mode range, supply limits, noise, stability, and pin-8 substrate behavior before approving a replacement.
Route precision inputs away from switching nodes, high-current return paths, inductors, and digital clocks. Use a compact feedback network to minimize parasitic capacitance, especially because the OPA124U gain-bandwidth product is 1.5 MHz and its 1.6 V/µs slew rate makes loop behavior sensitive to excess load capacitance. Provide local supply bypassing according to the manufacturer guidance and maintain a low-impedance return for bias current. Verify the completed design with a scope because op-amp substitution can alter stability even when the package is identical.
اطلاعات انطباق
The supplied verified data did not extract a definitive RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statement for OPA124U. The OPA124 family is shown in an 8-pin SOIC package, but package construction alone is not sufficient evidence for a specific compliance declaration.