OPA132UA - 8MHz FET-Input Audio Op Amp | Texas Instruments
MPN: OPA132UA ✓ نشطOPA132UA نظرة عامة
An operational amplifier is a voltage-controlled differential amplifier used to amplify, buffer, filter, or condition analog signals. The OPA132 belongs to the operational-amplifier hierarchy within analog and mixed-signal ICs, while its FET-input architecture makes it especially useful where source impedance is high and input bias current must remain low. The single-channel configuration also permits flexible allocation of amplifier, comparator, and analog-processing resources across a board.
Key features include an 8 MHz bandwidth, 20 V/µs slew rate, maximum input bias current of 5 pA, maximum offset voltage of 500 µV, and low distortion of 0.00008%. According to the manufacturer datasheet, the OPA132 family also provides an open-loop gain of 130 dB with a 600 Ω load and a wide supply range extending to ±18 V. These characteristics make the device useful where accurate small-signal reproduction and rapid large-signal transitions must coexist.
The combination of wide bandwidth and high slew rate produces short settling behavior, while the FET input stage minimizes current drawn from high-impedance sources. The 50 pA maximum input bias current is particularly important when the source is a sensor, transducer, photodiode, or other high-output-resistance element. The 500 µV maximum offset voltage supports precision amplification, although actual accuracy still depends on feedback resistors, source impedance, and circuit-noise conditions.
Typical uses include high-fidelity audio channels, active crossover networks, instrumentation preamplifiers, communications interfaces, analog filters, and data-acquisition front ends. In audio equipment, the combination of 8 MHz bandwidth, 20 V/µs slew rate, and low distortion supports low-distortion signal processing. In sensor interfaces, the 5 pA nominal bias current helps avoid loading of high-impedance sources.
The primary design consideration is supply-headroom management. Although the family supports a wide supply range up to ±18 V, the amplifier still requires adequate voltage at its pins to maintain output swing and avoid distortion. Decoupling capacitors should be placed close to the supply pins, and feedback-component values should be checked against the amplifier's noise, bias-current, and stability behavior before production use.
This product page consolidates manufacturer specifications, distributor availability references, same-footprint alternatives, and application-focused design guidance. It also distinguishes verified drop-in information from parameters that still require direct comparison against the current manufacturer datasheet and the specific finished design.
بدائل مباشرة لـ OPA132UA — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
OPA131UA
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←OPA137U
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←OPA134UA
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←OPA136UA
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
OPA138UA
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
OPA132UA الحدود القصوى والخصائص الكهربائية
| Amplifier Type | Single operational amplifier |
| Input Bias Current | 5 pA nominal |
| Maximum Input Bias Current | 50 pA |
| Gain-Bandwidth Product | 8 MHz |
| Slew Rate | 20 V/µs |
| Maximum Supply Voltage | ±18 V |
| Open-Loop Gain | 130 dB with 600 Ω load |
| Maximum Offset Voltage | 500 µV |
| Low Distortion | 0.00008% |
| Input Transistor Type | FET input |
| Circuit Count | 1 circuit |
| العلبة | 8-pin SOIC |
| نوع التركيب | Surface mount |
| Product Type | General-purpose operational amplifier |
| Application Class | Audio, data acquisition, communications, and general-purpose amplification |
| High-Source-Impedance Support | Supported by 5 pA nominal input bias current |
تكوين أطراف OPA132UA
| دبوس 1 | NC — Not connected |
| دبوس 2 | -IN — Inverting input |
| دبوس 3 | +IN — Non-inverting input |
| دبوس 4 | V- — Negative supply connection |
| دبوس 5 | NC — Not connected |
| دبوس 6 | OUT — Output |
| دبوس 7 | V+ — Positive supply connection |
| دبوس 8 | NC — Not connected |
التطبيقات النموذجية
OPA132UA مناسب لـ 6 التطبيقs: High-Fidelity Audio Signal Chains, High-Impedance Sensor Preamplifiers, Communications Interface Amplification, Data-Acquisition Front Ends, Precision Active Filters, General-Purpose Buffering and Gain Stages.
High-Fidelity Audio Signal Chains
The OPA132UA fits high-fidelity audio signal chains because it combines 8 MHz bandwidth, 20 V/µs slew rate, and low distortion of 0.00008%. According to the Texas Instruments OPAx132 datasheet, the device is intended for audio applications and can reproduce dynamic signals with low distortion while offering fast large-signal response. It can be used in preamplifier, line-stage, active-filter, or buffer positions when the source impedance is high. The low 5 pA nominal input bias current reduces loading, while FET inputs support low-noise coupling from audio transducers. Designers should verify output swing, supply headroom, and the noise of external feedback resistors.
موصى به
High-Impedance Sensor Preamplifiers
The OPA132UA is suitable for sensor preamplifiers because its FET input contributes only 5 pA nominal bias current, with a maximum of 50 pA. According to the Texas Instruments OPAx132 datasheet, the amplifier also offers 8 MHz bandwidth and 20 V/µs slew rate, allowing it to handle both source-loaded and reasonably fast sensor signals. In a transimpedance or noninverting input stage, lower bias current reduces voltage error across a high source impedance. The 500 µV maximum offset voltage is also relevant to DC-accurate measurements. Feedback resistor selection, input capacitance, guarding, bandwidth-noise tradeoffs, and the sensor's leakage current should be evaluated together.
موصى به
Communications Interface Amplification
The OPA132UA can amplify low-level communications signals where source impedance and signal speed are both important. Its 8 MHz gain-bandwidth product supports moderate-bandwidth active filtering, while 20 V/µs slew rate allows rapid output transitions without relying on slow bipolar-input devices. The manufacturer identifies communications as a suitable OPA132 application class and specifies a wide supply range extending to ±18 V. In receiver and transmitter interface circuits, the amplifier may provide gain, impedance buffering, or active filtering. Layout must minimize parasitic capacitance around high-impedance inputs, and the selected feedback network should preserve the intended closed-loop stability under capacitive loading.
موصى به
Data-Acquisition Front Ends
The OPA132UA is appropriate for data-acquisition front ends that must combine moderate bandwidth with low input bias current. According to the Texas Instruments OPAx132 datasheet, the device provides 8 MHz bandwidth, 20 V/µs slew rate, 130 dB open-loop gain with a 600 Ω load, and a maximum offset voltage of 500 µV. These characteristics support conditioning of low-level sensor or converter signals before acquisition electronics. The low 5 pA nominal bias current is useful with high-impedance transducers, while the bandwidth supports faster settling than many general-purpose precision amplifiers. Designers should account for input-referred noise, common-mode range, settling time, source capacitance, and the conversion system’s sampling requirements.
موصى به
Precision Active Filters
The OPA132UA is well suited to precision active filtering because its 8 MHz gain-bandwidth product provides frequency-response headroom beyond audio-band circuits, while its 20 V/µs slew rate supports low-distortion output at higher signal amplitudes. The verified low-distortion value of 0.00008% is particularly relevant to filter stages that process large dynamic-range signals. Its FET input stage contributes only 5 pA nominal bias current, which helps when the filter follows a high-impedance source. The amplifier can be used in Sallen-Key or multiple-feedback sections, subject to component tolerance and gain-bandwidth requirements. Noise-gain peaking and phase margin must be checked with the actual source and load impedances.
موصى به
General-Purpose Buffering and Gain Stages
The OPA132UA also serves as a high-speed general-purpose buffer or gain stage when a circuit needs more bandwidth and slew rate than a conventional precision amplifier provides. According to the Texas Instruments OPAx132 datasheet, the OPA132, OPA2132, and OPA4132 versions have identical specifications for design flexibility, and high-performance grades are available in single and dual versions. The single OPA132UA gives designers one amplifier per 8-pin package, simplifying channel allocation in mixed-signal boards. Its 5 pA nominal input bias current is beneficial when driving a high-impedance node. Critical checks include stable feedback ratios, output-current demand, capacitive-load behavior, and supply bypassing near the device.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ OPA132UA — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | OPA131UA | OPA137U | OPA134UA | OPA136UA | OPA138UA |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
أبرز الفروقات
- Verified low-bias-current input stage (مقابلOPA137U)
- High-speed performance with low distortion (مقابلOPA131UA)
- Single-channel 8-pin SOIC implementation (مقابلOPA134UA)
ملاحظات التصميم
Keep the OPA132UA input and feedback traces short and place input-side components close to pins 2 and 3. Because the FET-input device is intended for high-source-impedance use, even small PCB leakage or contamination can materially affect the input node. Avoid routing input traces beside supply returns, switching nodes, and high-impedance guard structures. Confirm that the final board has adequate copper grounding and that the selected package pin numbering matches the manufacturer drawing.
Place the supply-bypass capacitor immediately between pins 7 and 4, with a short and low-inductance ground return. The verified OPA132 family supports operation up to ±18 V, but the usable output swing still depends on supply headroom and load current. Check the design at the highest expected input frequency because 20 V/µs slew rate can generate large output-current demand into low-impedance loads. Do not operate close to absolute-maximum supply limits without accounting for transient margin.
Do not assume that an amplifier with 8 MHz gain-bandwidth product will provide 8 MHz closed-loop bandwidth at every gain setting. Closed-loop bandwidth depends on noise gain, and the amplifier must also remain stable with the actual source impedance, load capacitance, and feedback network. Before substituting an alternative, verify pins 1 through 8, input bias current, offset voltage, output swing, supply range, and noise because a matching package alone does not guarantee identical behavior.
معلومات الامتثال
The supplied verified excerpts do not explicitly extract RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations for OPA132UA. Current manufacturer compliance and quality documents should be reviewed before regulated production use.