MC33078D - Dual Low-Noise 15MHz Op Amp | Texas Instruments
Артикул: MC33078D ✓ АктивенMC33078D Обзор
A dual operational amplifier combines two amplifiers in one package, providing a practical path from analog signal conditioning to broader voltage-amplifier and analog IC functions. Each channel can amplify, buffer, filter, or drive a defined analog signal when used with suitable external components. MC33078D is particularly useful where low noise, wide bandwidth, and fast large-signal response are more important than the very low power consumption associated with CMOS-only amplifiers.
The MC33078D uses bipolar technology, which supports low-noise operation and audio-focused performance. Its 4.5 nV/√Hz input-noise figure is suited to high-fidelity audio preamplification, microphone-stage signal conditioning, and low-level instrumentation. A 15 MHz gain-bandwidth product supports higher closed-loop bandwidth than slower general-purpose precision amplifiers, while the 7 V/µs slew rate provides improved ability to reproduce large-amplitude signals without excessive distortion.
Two independent channels in one package reduce board area for balanced, differential, or multi-stage analog circuits. The 8-pin SOIC (D) package uses a familiar surface-mount footprint and supports automated assembly. Because its dual topology is not rail-to-rail by specification, applications must account for the allowable input and output voltage ranges when using single-supply or dual-supply configurations. Decoupling and stable feedback-network design remain essential for low-noise performance.
Typical uses include stereo audio input amplification, active equalization, low-level sensor conditioning, line-stage amplification, and mixed-signal filtering. The two channels may also implement separate gain blocks, buffers, or active filters when the required common-mode range and output swing fit the application. In audio designs, low-noise operation helps preserve quiet signal paths, while the 15 MHz bandwidth and 7 V/µs slew rate provide headroom for detailed waveform reproduction.
When laying out the circuit, place the power-supply bypass capacitor close to the supply pins and keep feedback resistors and input components compact to minimize parasitic capacitance and noise pickup. Verify gain-bandwidth and stability requirements with the actual noise-gain network. Single-supply operation may require biasing or AC coupling if the source cannot reach ground, so confirm the input common-mode range before finalizing the schematic.
This product page combines manufacturer specifications, package information, practical analog-design guidance, and verified drop-in alternatives. It also highlights the exact differences between same-manufacturer and cross-manufacturer options, helping engineers compare compatibility, bandwidth, noise, temperature range, and application fit before making a board-level replacement decision.
Аналоги без доработки для MC33078D — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
MC33078DE4
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MC33078DG
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MC33078D
✅ Прямая заменаУточнить цену
Открыть даташит →NCV33078D
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MC33078D Максимальные параметры и электрические характеристики
| Number of Amplifiers | 2 circuits |
| Input Voltage Noise Density | 4.5 nV/√Hz |
| Gain-Bandwidth Product | 15 MHz |
| Slew Rate | 7 V/µs |
| Transistor Technology | Bipolar |
| Корпус | 8-pin SOIC (D) |
| Диапазон рабочих температур | -40 °C to 85 °C |
| Primary Application | Audio and data-signal amplification |
| Number of Channels | 2 |
| Тип монтажа | Surface Mount |
Конфигурация выводов MC33078D
| Контакт 1 | OUTA — Amplifier A output |
| Контакт 2 | IN A- — Amplifier A inverting input |
| Контакт 3 | IN A+ — Amplifier A non-inverting input |
| Контакт 4 | V- — Negative supply connection |
| Контакт 5 | IN B+ — Amplifier B non-inverting input |
| Контакт 6 | IN B- — Amplifier B inverting input |
| Контакт 7 | OUTB — Amplifier B output |
| Контакт 8 | V+ — Positive supply connection |
Типичное применение
MC33078D подходит для 6 применениеs: Stereo Audio Preamp, Microphone Signal Conditioning, Active Audio Equalization, Low-Level Sensor Conditioning, Line-Level Buffering, Mixed-Signal Filter Front End.
Stereo Audio Preamp
The MC33078D fits a stereo low-level audio preamplifier because each channel provides 4.5 nV/√Hz input-voltage noise, 15 MHz gain-bandwidth product, and 7 V/µs slew rate. The two amplifiers can share an input or apply separate gain to left and right channels. Place the IC close to the source and feedback components so that the low-noise benefit is not undermined by long PCB traces. The 15 MHz bandwidth provides more closed-loop bandwidth than slower audio-focused amplifiers, while the 7 V/µs slew rate helps reduce large-signal distortion. Verify the input common-mode range and output swing against the selected supply voltage before finalizing the gain stage.
Рекомендуется
Microphone Signal Conditioning
The MC33078D can amplify a low-level microphone signal while maintaining a compact dual-channel layout. Its 4.5 nV/√Hz noise density is well suited to reducing input-referred amplifier noise in a quiet recording path, and the 15 MHz gain-bandwidth product permits useful closed-loop bandwidth for higher-bandwidth microphone and line-level stages. The 7 V/µs slew rate improves transient response for waveforms with substantial amplitude. Use short input routes, clean grounding, and input biasing appropriate to the microphone source. Confirm signal polarity and common-mode limits before deciding whether an inverting or non-inverting configuration is appropriate.
Рекомендуется
Active Audio Equalization
Each MC33078D channel can implement a first-order active equalizer using conventional resistors and capacitors. The 15 MHz gain-bandwidth product leaves considerable bandwidth above typical audio-band equalization networks, while the 7 V/µs slew rate supports cleaner reproduction of transients than a slow general-purpose amplifier. The 4.5 nV/√Hz noise density is valuable when the equalizer follows a quiet source. Select resistor and capacitor values against the amplifier’s noise-gain curve, and keep the passive network physically close to the relevant input and feedback pins to minimize parasitic coupling and instability.
Рекомендуется
Low-Level Sensor Conditioning
The MC33078D is suitable for conditioning low-level sensor outputs when the design values noise, bandwidth, and transient response more heavily than minimum power. Its 4.5 nV/√Hz input noise reduces the amplifier’s input-referred contribution, while the 15 MHz gain-bandwidth product supports amplification beyond the sensor’s signal bandwidth. The 7 V/µs slew rate improves handling of occasional large input excursions. Two independent channels can process complementary sensors or a differential signal. The designer must confirm the input bias current, common-mode range, offset behavior, and output swing against the sensor output range and selected supply rails.
Рекомендуется
Line-Level Buffering
The MC33078D can buffer stereo line-level signals when the source needs lower impedance and isolation from the following stage. Although configured as a unity-gain buffer, the device retains a 4.5 nV/√Hz input-noise specification, 15 MHz gain-bandwidth product, and 7 V/µs slew rate. This combination supports wide-frequency audio and general signal paths rather than limiting the design to slow, low-bandwidth buffering. Confirm that the buffered signal remains inside the amplifier’s input common-mode and output voltage limits. A close physical layout, short feedback connection, and local supply bypassing help preserve low distortion and stable operation.
Рекомендуется
Mixed-Signal Filter Front End
The MC33078D can serve as the active element in analog filters placed before an ADC or mixed-signal converter. Its 15 MHz gain-bandwidth product provides ample loop bandwidth for many audio- and instrumentation-band filter designs, while the 7 V/µs slew rate limits large-signal overload in higher-amplitude paths. The 4.5 nV/√Hz noise density is particularly useful when the filter must preserve a weak source signal. Design each feedback network for the intended noise gain, keep component loops compact, and verify stability and transient response in simulation before fabrication. The dual package also permits two related filter channels in one footprint.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для MC33078D — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | MC33078DE4 | MC33078DG | MC33078D | NCV33078D |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | onsemi | STMicroelectronics | onsemi |
| Package | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) | 8-pin SOIC (D) |
| Number of Amplifiers | 2 circuits | 2 circuits | 2 circuits | 2 circuits | 2 circuits |
| Input Voltage Noise Density | 4.5 nV/√Hz | 4.5 nV/√Hz | 4.5 nV/√Hz | 4.5 nV/√Hz | 4.5 nV/√Hz |
| Gain-Bandwidth Product | 15 MHz | 15 MHz | 15 MHz | 15 MHz | 15 MHz |
| Slew Rate | 7 V/µs | 7 V/µs | 7 V/µs | 7 V/µs | 7 V/µs |
| Transistor Technology | Bipolar | Bipolar | Bipolar | Bipolar | Bipolar |
| Primary Application | Audio and data-signal applications | Audio and data-signal applications | Audio and data-signal applications | Audio applications | Audio and data-signal applications |
Ключевые отличия
- Combines low input noise with wide bandwidth in a dual amplifier (против NE5534PSR)
- Uses an established 8-pin SOIC board footprint (против MC33078DE4)
- Provides two independent high-speed amplifier channels (против MC33072)
Заметки по проектированию
Place the supply bypass capacitor immediately adjacent to the amplifier’s supply pins and connect it to a low-impedance ground plane. Keep the OUTA, INA+, INA-, OUTB, INB+, and INB- routes short, particularly when the source impedance is high. Routing inputs beside clock, switching-node, or high-current traces can add pickup that is not represented by the device’s 4.5 nV/√Hz input-noise specification.
Do not assume rail-to-rail input or output operation. Verify the selected supply voltage against the manufacturer’s input common-mode and output-swing limits. In a single-supply audio circuit, a source near 0 V may require AC coupling or biasing. Also check whether unity-gain stability is explicitly supported for the chosen topology rather than inferring it solely from the 15 MHz gain-bandwidth product.
Design each closed-loop stage around its noise gain rather than its signal gain. Keep feedback resistors close to the amplifier pins and avoid long, high-impedance input nets. The 15 MHz gain-bandwidth product and 7 V/µs slew rate provide substantial bandwidth, but excessive capacitance, an unsuitable feedback network, or poor grounding can still create oscillation, ringing, or added distortion.
For stereo or dual-channel layouts, keep the two analog paths symmetric so that channel-to-channel propagation and crosstalk remain controlled. Separate the MC33078D from digital clocks, switching regulators, and high-speed digital return currents. If the circuit handles microphone-level signals, use a quiet ground strategy and avoid routing either input over split-plane boundaries that could increase noise pickup.
Информация о соответствии
No specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status is stated for the selected MC33078D ordering. The NCV33078D ordering has an automotive-oriented name, but its qualification status is not inferred from the ordering code.
