MC33078P - Dual 16MHz Low-Noise Op Amp | Texas Instruments
Teilenummer: MC33078P ✓ AktivMC33078P Übersicht
An operational amplifier is an analog signal-conditioning IC that uses high-gain differential amplification to increase the voltage difference between two inputs. In the wider hierarchy, an op amp belongs to amplifiers, analog integrated circuits, and signal-chain conditioning devices. The MC33078P contains two independent amplifiers in one package, allowing one package to serve two channels while reducing board area and simplifying dual-audio or dual-data-signal designs.
The MC33078/9 family uses bipolar transistor technology with high-frequency PNP input transistors. This architecture provides low input voltage noise, high gain-bandwidth product, high slew rate, low total harmonic distortion of 0.002%, and a low input offset voltage of 0.15 mV. These characteristics make the amplifier suitable for audio preamplification, filtering, instrumentation, and general-purpose analog signal conditioning where both small-signal fidelity and bandwidth are important.
The two channels operate independently from the same supply pins. Its 16 MHz gain-bandwidth product allows useful closed-loop bandwidth well below the unity-gain frequency, while the 7 V/µs slew rate supports faster large-signal transitions than many general-purpose bipolar op amps. Noise and distortion figures should therefore be evaluated in the same signal bandwidth and output amplitude used in the target circuit; headline values do not describe complete system performance by themselves.
Typical uses include microphone and line-level audio amplification, active filters, analog instrumentation, low-level sensor conditioning, and dual-channel signal processing. The 8-pin PDIP package is suitable for through-hole construction, prototyping, repair work, and applications where the larger package is acceptable. Local bypass capacitors close to the supply pins remain important for stable operation and low-noise performance.
The principal design trade-off is package size rather than electrical capability: PDIP-8 is easy to install manually but occupies more PCB area than surface-mount dual-op-amp packages. Designers should preserve adequate output-current headroom for capacitive loads, verify stable operation with the selected feedback network and load, and avoid assuming that low-noise input devices are interchangeable with FET-input amplifiers because bias-current and distortion behavior differ.
This page consolidates the verified manufacturer specifications, distributor availability references, and engineering-focused selection guidance for MC33078P. It also distinguishes documented MC33078-family options from true pin-compatible replacements, helping engineers avoid treating merely similar amplifiers as drop-in substitutes.
Drop-in-Alternativen für MC33078P – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Für dieses Produkt sind keine Drop-in-Alternativen verfügbar.
Alternativen anfordernMC33078P Grenzwerte & elektrische Eigenschaften
| Amplifier Type | General-purpose dual operational amplifier |
| Number of Circuits | 2 circuits |
| Technology | Bipolar transistor technology with high-frequency PNP input transistors |
| Gain-Bandwidth Product | 16 MHz |
| Slew Rate | 7 V/µs |
| Input Voltage Noise Density | 4.5 nV/√Hz |
| Input Offset Voltage | 0.15 mV |
| Total Harmonic Distortion | 0.002% |
| Supply Voltage Range | ±5 V to ±18 V |
| Supply Configuration | Single-supply or dual-supply operation |
| Betriebstemperaturbereich | -40°C to +85°C |
| Gehäuse | 8-pin PDIP, 0.300 inch pitch, 7.62 mm row spacing |
| Montageart | Through-hole |
| Packaging | Tube |
| RoHS Compliance | unknown |
| REACH Compliance | unknown |
| AEC-Q100 Qualification | not_applicable |
MC33078P Pin-Konfiguration
| Pin 1 | OUTPUT A — Output of amplifier A |
| Pin 2 | INVERTING INPUT A — Inverting input of amplifier A |
| Pin 3 | NON-INVERTING INPUT A — Non-inverting input of amplifier A |
| Pin 4 | V- — Negative supply connection |
| Pin 5 | NON-INVERTING INPUT B — Non-inverting input of amplifier B |
| Pin 6 | INVERTING INPUT B — Inverting input of amplifier B |
| Pin 7 | OUTPUT B — Output of amplifier B |
| Pin 8 | V+ — Positive supply connection |
Typische Anwendungen
MC33078P ist geeignet für 6 Anwendungs: Low-Noise Audio Preamplifier, Active Audio Filter, Instrumentation Signal Conditioning, Dual-Channel Data Signal Processing, Audio Codec Interface Conditioning, Precision Analog Buffer.
Low-Noise Audio Preamplifier
The MC33078P fits a low-noise audio preamplifier because its 4.5 nV/√Hz input voltage noise and 0.002% total harmonic distortion are appropriate for processing small audio signals. The device can amplify microphone or line-level inputs in two independent channels while providing a 7 V/µs slew rate for faster signal transitions. Texas Instruments identifies quality audio processing as an intended application in the MC33078 manufacturer datasheet. In practice, the input source impedance, selected closed-loop gain, and required audio bandwidth determine the achievable system noise and distortion. Decoupling capacitors should be placed close to the supply pins, and the two channels should be routed to maintain similar grounding and gain paths.
Empfohlen
Active Audio Filter
The MC33078P is well suited to active filtering because its 16 MHz gain-bandwidth product and 7 V/µs slew rate provide bandwidth beyond typical audio-frequency requirements. Its bipolar input stage offers a documented 4.5 nV/√Hz voltage-noise density, allowing a small-signal filter to avoid becoming the dominant noise source in the signal path. The amplifier can implement a two-pole filter in either Sallen-Key or multiple-feedback form. Component tolerances and the op amp's open-loop gain, output swing, and stability with the selected feedback network determine the realized response. Verify the exact gain-bandwidth and phase-margin behavior from the manufacturer datasheet before narrowing the filter at high frequencies.
Empfohlen
Instrumentation Signal Conditioning
The MC33078P can serve as the input stage of instrumentation signal-conditioning circuitry when a design requires low voltage noise, moderate bandwidth, and two independent amplifier channels. Its 16 MHz gain-bandwidth product is more than sufficient for many sensor and measurement front ends operating below the audio range, while the 0.15 mV input-offset specification provides a documented basis for DC-error assessment. For bridge, thermocouple, or high-impedance sensors, however, input bias current and common-mode limits must be checked before selection. The dual package allows one channel to amplify the sensor while the other handles buffering or reference-related functions, provided both channels maintain suitable common-mode and output-swing margins.
Empfohlen
Dual-Channel Data Signal Processing
The MC33078P is appropriate for two-channel data-signal processing when both channels require low-noise bipolar amplification rather than very low input-bias current. The 16 MHz gain-bandwidth product supports moderate-bandwidth conditioning, and the 7 V/µs slew rate reduces large-signal slew limitation compared with slower general-purpose parts. Two channels in one PDIP-8 package can simplify a differential driver, matched processing path, or dual sensor interface while reducing the number of packages. Practical implementation still requires independent gain-setting resistors, stable feedback networks, and adequate output-current margin for the load. The Texas Instruments MC33078 manufacturer datasheet identifies data-signal processing as a target application, supporting this use when the circuit remains within the documented electrical limits.
Empfohlen
Audio Codec Interface Conditioning
The MC33078P can condition low-level signals around an audio codec or digital-to-analog interface, particularly in a legacy through-hole design. Its documented 4.5 nV/√Hz voltage-noise density helps preserve small-signal integrity, while the 16 MHz gain-bandwidth product provides margin for active gain and filtering stages. The bipolar input stage requires attention to bias current, which may be significant with high source impedances, and the output must remain within the voltage-swing limits of the selected supply. The amplifier should be placed close to the protected signal path, with short traces and local supply bypassing. Confirm the codec's expected input impedance and drive level before inserting an additional active stage, because unnecessary gain can increase distortion rather than improve the result.
Empfohlen
Precision Analog Buffer
The MC33078P can function as a unity-gain or moderate-gain buffer when the source is low impedance and the load is not excessively capacitive. Its 16 MHz gain-bandwidth product is sufficient for unity-gain buffering across a broad range of lower-frequency measurements, and the 7 V/µs slew rate helps the output follow moderate-amplitude transient signals. A voltage buffer does not improve accuracy by itself; input offset, bias current, noise, output impedance, and load drive remain important. Check the datasheet's output-current and capacitive-load guidance before driving long cables or high-capacitance nodes. Because the MC33078P uses bipolar inputs, it is not interchangeable with every FET-input op amp in high-impedance applications even if the package and basic pin arrangement appear similar.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MC33078P – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt |
|---|---|
| Package | 8-pin PDIP |
| Brand | Texas Instruments |
| Amplifier Type | General-purpose dual operational amplifier |
| Number of Circuits | 2 circuits |
| Gain-Bandwidth Product | 16 MHz |
| Slew Rate | 7 V/µs |
| Input Voltage Noise Density | 4.5 nV/√Hz |
| Input Offset Voltage | 0.15 mV |
| Total Harmonic Distortion | 0.002% |
| Supply Voltage Range | ±5 V to ±18 V |
| Operating Temperature Range | -40°C to +85°C |
| Technology | Bipolar with high-frequency PNP input transistors |
Wichtigste Unterscheidungsmerkmale
- Provides documented high-speed performance in a general-purpose bipolar dual op amp (vs. MC1458D)
- Combines low input noise with high slew rate (vs. LM324D)
- Targets quality audio and data-signal processing rather than a general low-power function (vs. TLV1504ID)
- Offers two independent channels in a through-hole dual-op-amp package (vs. OPA2209)
Designhinweise
Place supply-bypass capacitors close to pins 8 and 4 and keep the return path short. The manufacturer datasheet identifies bipolar technology and a wide ±5 V to ±18 V supply range, but it does not provide the verified quiescent-current values needed for a final dissipation calculation. Size the supply path for the actual channel load, output current, and source impedance rather than assuming that the quiescent rating alone represents total current.
Keep each feedback loop compact and connect the inverting-input return directly to the relevant output-side compensation point. For dual-channel audio or data paths, route the two channels symmetrically to reduce differences in pickup and ground impedance. The PDIP-8 footprint supports prototype accessibility, but lead spacing and long through-hole loops can add parasitic inductance; use a low-inductivity ground plane and local bypass capacitance.
Check gain-bandwidth product against the highest closed-loop gain and frequency used, and check the 7 V/µs slew rate against the required output amplitude. A wideband amplifier can still clip or oscillate if the feedback network, output load, supply decoupling, or output-voltage headroom is unsuitable. For very high source impedances, also verify the bipolar input bias current before selecting MC33078P over a FET-input amplifier.
Do not treat MC33078N, MC33078D, MC33078PE4, OPA2209, or another low-noise dual amplifier as an automatic MC33078P replacement. The supplied search data explicitly reports zero cross-reference alternatives for MC33078P, and the package or key electrical characteristics of the candidates are not fully established. Confirm package drawing, every pin function, supply range, input bias current, stability, output swing, and application-specific requirements before substituting a part.
Compliance-Informationen
The supplied verified data does not contain explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 statements for MC33078P. AEC-Q100 is marked not applicable because no automotive-qualified MC33078P ordering option was documented.
