MC33079N - Low-Noise Quad Op Amp | STMicroelectronics | Audio
부품 번호: MC33079N ✓ 활성MC33079N 개요
An operational amplifier is a voltage-gain building block used throughout analog electronics. The MC33079 belongs to the op-amp hierarchy, where it provides amplification, buffering, filtering, and active gain for analog signals. Its four amplifiers share a common power supply in one package, allowing one quad device to implement several stages of an audio preamplifier, mixer, line amplifier, or measurement circuit while reducing board area.
The MC33079N combines low voltage noise with high-frequency performance. The 4.5 nV/√Hz noise density supports low-noise audio amplification, while the 15 MHz gain-bandwidth product provides useful bandwidth for audio-frequency closed-loop designs. A 7 V/µs slew rate supports large-signal reproduction and reduces the likelihood of slew-rate distortion in higher-gain stages. The manufacturer also specifies very low distortion of 0.002%, along with strong phase and gain margins.
Its four-circuit organization provides flexibility for mixed-signal layouts. Each amplifier can perform a separate function, such as input amplification, active filtering, buffering, or output drive, when the system does not require all four stages simultaneously. Since this is an analog integrated circuit, its performance depends on suitable bypass capacitors, stable feedback networks, appropriate source and load impedances, and careful consideration of common-mode and output-voltage limits.
Typical uses include stereo and multichannel audio preamplification, active crossover networks, microphone and line-level signal conditioning, servo-control loops, and instrumentation requiring multiple amplifiers. The quad format can also reduce component count by replacing several individual single or dual amplifier packages. Where an existing amplifier section uses an equivalent 14-pin quad footprint, the MC33079N can serve as a focused upgrade for lower-noise audio operation after checking pin functions and operating limits.
Design the supply rails to remain within the device's operating requirements and place the bypass capacitors close to the power pins. Keep feedback loops short, use resistors and capacitors suitable for the intended audio bandwidth, and verify stability with the selected gain and load. An oscilloscope measurement of output clipping, noise, and slew behavior can confirm that the overall circuit, rather than the op amp alone, meets the system specification.
This page organizes the MC33079N's principal electrical characteristics, package details, application guidance, drop-in replacement options, and engineering trade-offs. It is designed to help engineers evaluate noise, bandwidth, slew rate, distortion, and compatibility before integrating the amplifier into an audio or precision analog design.
드롭인 대체품: MC33079N — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
MC33079P
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MC33179P
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MC33178P
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MC33177P
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MC33079D
✅ 드롭인 ⚠️ 사양 미검증가격 문의
데이터시트 보기 →MC33079N 최대 정격 & 전기적 특성
| Number of Amplifiers | 4 circuits |
| Voltage Noise Density | 4.5 nV/√Hz |
| Gain-Bandwidth Product | 15 MHz |
| Slew Rate | 7 V/µs |
| Distortion | 0.002% |
| Device Type | Monolithic quad operational amplifier |
| Primary Application | Audio signal processing |
| 패키지 | 14-pin DIP |
| 실장 유형 | Through-hole |
| Input Transistor Technology | Bipolar |
MC33079N 핀 구성
| 핀 1 | OUT A — Amplifier A output |
| 핀 2 | IN- A — Amplifier A inverting input |
| 핀 3 | IN+ A — Amplifier A non-inverting input |
| 핀 4 | V- — Negative power supply |
| 핀 5 | IN+ B — Amplifier B non-inverting input |
| 핀 6 | IN- B — Amplifier B inverting input |
| 핀 7 | OUT B — Amplifier B output |
| 핀 8 | OUT C — Amplifier C output |
| 핀 9 | IN- C — Amplifier C inverting input |
| 핀 10 | IN+ C — Amplifier C non-inverting input |
| 핀 11 | V+ — Positive power supply |
| 핀 12 | IN+ D — Amplifier D non-inverting input |
| 핀 13 | IN- D — Amplifier D inverting input |
| 핀 14 | OUT D — Amplifier D output |
일반적인 애플리케이션
MC33079N 적합 용도: 6 애플리케이션s: Stereo Audio Preamplifier, Active Crossover Network, Microphone Signal Conditioning, Line-Level Audio Buffer, Active Equalization and Filtering, General Instrumentation Amplification.
Stereo Audio Preamplifier
The MC33079N is well matched to stereo audio preamplification because its 4.5 nV/√Hz voltage noise limits amplifier-added hiss, while the 15 MHz gain-bandwidth product provides useful bandwidth for audio-frequency feedback networks. Two channels can form the left and right input stages, with the remaining channels available for gain control, active equalization, or output buffering. Its 7 V/µs slew rate helps preserve large-amplitude audio waveforms, and the 0.002% distortion specification supports low-distortion reproduction. The principal design checks are the selected gain against loop stability, output swing, and the supply headroom needed for the audio signal.
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Active Crossover Network
The MC33079N can implement the multiple buffered stages used in an active audio crossover because it contains four amplifiers in one 14-pin DIP package. The 15 MHz gain-bandwidth product leaves substantial open-loop bandwidth for typical low- and high-band filter sections, while the 4.5 nV/√Hz noise density supports low-noise gain stages. The 7 V/µs slew rate improves capability with fast-changing musical transients compared with slower general-purpose amplifiers. Each channel should be assigned according to its pin functions, with crossover frequency, gain, and phase determined by the selected filter topology rather than by the op amp alone.
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Microphone Signal Conditioning
For low-level microphone amplification, the MC33079N's 4.5 nV/√Hz voltage noise helps reduce amplifier-generated noise after the signal has been converted from current to voltage. Its four amplifiers allow separate channels for microphone preamplification, gain adjustment, filtering, and line-level buffering when the design requires that sequence. The 15 MHz gain-bandwidth product supports moderate closed-loop bandwidth, and the 7 V/µs slew rate provides suitable dynamic range for audio transients. A practical implementation must include microphone-bias components, low-value feedback resistors, input protection, and a layout that keeps sensitive input traces short.
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Line-Level Audio Buffer
The MC33079N is suitable for line-level buffering where the goal is to preserve an audio signal while providing drive for a downstream mixer, attenuator, or amplifier stage. A 15 MHz gain-bandwidth product supports useful closed-loop bandwidth, and the 7 V/µs slew rate provides headroom for rapidly changing signal peaks. The low 4.5 nV/√Hz voltage noise is especially valuable when buffering low-amplitude sources. Because each IC contains four channels, multiple balanced or unbalanced buffers can be consolidated, although channel-to-channel load sharing and thermal conditions should be evaluated under worst-case signal and supply conditions.
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Active Equalization and Filtering
The MC33079N can support active equalization, shelving filters, and other small-signal audio shaping networks because four amplifiers are available within a single 14-pin DIP package. The 15 MHz gain-bandwidth product allows closed-loop gains to be selected with reasonable bandwidth margin, while the 4.5 nV/√Hz noise density is beneficial when processing signals after prior gain stages. The 7 V/µs slew rate reduces large-signal distortion risk during steep filter transitions. Component tolerances, operating-gain stability, and the intended audio frequency range should determine the actual filter topology and external resistor or capacitor values.
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General Instrumentation Amplification
The MC33079N can serve in instrumentation and control circuits that need several low-noise voltage-gain stages. Its 4.5 nV/√Hz voltage noise is useful when amplifying small signals, and the 15 MHz gain-bandwidth product provides more bandwidth than conventional audio-only amplifiers. Four channels can implement instrumentation gain, filtering, and output-buffer functions while reducing package count. The selected gain must remain stable with the feedback network, and input bias current, offset voltage, common-mode range, and output swing must be checked against the exact sensor output and supply rails. Instrumentation layout should also preserve sensor grounding and minimize leakage paths around high-impedance inputs.
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추천 제품 요약
엔지니어링 참조 데이터: MC33079N — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MC33079P | MC33179P | MC33178P | MC33177P | MC33079D |
|---|---|---|---|---|---|---|
| Package | 14-pin DIP | 14-pin DIP | 14-pin DIP | 14-pin DIP | 14-pin DIP | 14-pin DIP |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Amplifier Count | 4 | 4 | 4 | 4 | 4 | 4 |
| Input Technology | Bipolar | Bipolar | Bipolar | Bipolar | Bipolar | Bipolar |
| Primary Application | Audio and general signal processing | Audio and general signal processing | Audio and data signal processing | Audio and general signal processing | Audio and general signal processing | Audio and general signal processing |
주요 차별점
- Higher headline gain-bandwidth product within the related quad-amplifier family (vs MC33179P)
- Fast 7 V/µs slew rate supports dynamic audio waveforms (vs MC33178P)
- Low-noise specification supports high-fidelity audio stages (vs MC33177P)
설계 노트
Place a supply-bypass capacitor close to pin 11 and another bypass path close to pin 4. Follow the manufacturer application circuit for the required capacitance and connection arrangement. Because four amplifiers share the same package, estimate total supply-current demand with all channels loaded and check the regulator's dropout behavior at the minimum input voltage. Do not rely on an individual amplifier's current rating when determining package or PCB supply capacity.
Keep the non-inverting inputs, feedback components, and output returns compact. High-impedance input traces should remain short and should be surrounded by a grounded reference where practical. Route output signals away from adjacent input nodes to limit capacitive feedback. Use one consistent ground reference for input returns and bypass capacitors, and avoid creating narrow copper paths beneath the DIP that could increase temperature rise.
Do not assume that the package footprint alone guarantees functional compatibility. Verify amplifier-channel ordering, positive and negative supply pins, input polarity, common-mode range, output swing, and stable closed-loop gain for every proposed replacement. In audio boards, also confirm that the alternative's noise and distortion remain acceptable at the intended signal amplitude. A scope comparison at the output can reveal oscillation, clipping, or excess phase margin concerns.
규정 준수 정보
Compliance status was not stated in the manufacturer product-page excerpt or the other cited pages. Confirm the exact ordering code against current STMicroelectronics material-compliance documentation before production release.