MC33078N - Dual Low-Noise 15MHz Op Amp | STMicroelectronics
Référence : MC33078N ✓ ActifMC33078N Présentation
An operational amplifier is a high-gain differential amplifier whose inverting and non-inverting inputs are compared to produce an amplified output. The bipolar input stage of the MC33078N combines low voltage noise with a wide gain-bandwidth product and high slew rate. In the broader semiconductor hierarchy, the MC33078N is an analog amplifier IC, more specifically a dual low-noise operational amplifier used in audio, instrumentation, and general-purpose signal-processing circuits.
The principal performance features include 4.5 nV/√Hz input-voltage noise, 15 MHz gain-bandwidth product, and 7 V/µs slew rate. Its two amplifier channels provide design economy in stereo audio preamplifiers, active filters, line drivers, and instrumentation. The 8-pin Mini DIP package is also suitable for through-hole construction and prototyping where dual-line access and straightforward manual assembly are useful.
The bipolar architecture provides the fast large-signal response needed for audio signals while retaining low noise for microphone-level and line-level work. The 15 MHz gain-bandwidth product supports wider closed-loop bandwidth than a low-frequency general-purpose amplifier, while the 7 V/µs slew rate helps the device reproduce large-amplitude waveforms without excessive distortion. Supply topology determines the usable common-mode and output-voltage ranges, so single- and dual-supply circuits require different biasing arrangements.
Typical applications include stereo audio preamplification, active crossover and equalization networks, microphone preamplifiers, line-level buffers, active filters, sensor signal conditioning, and general dual-channel analog processing. In stereo equipment, the two channels can process left and right signals independently, reducing component count and helping maintain matched channel layouts.
For new PCB designs, place the decoupling capacitor close to the supply pin and connect the exposed return path directly to the ground plane. When replacing an existing MC33078 footprint, verify the exact power-supply range, common-mode limits, output swing, noise characteristics, and stability requirements rather than relying only on the DIP-8 outline.
This page combines manufacturer specifications, cross-reference information, practical application guidance, and package-aware replacement analysis to support faster engineering evaluation and sourcing.
Alternatives de remplacement direct pour MC33078N — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MC33078N (même facteur de forme et même empreinte) — différant par Amplifier Type, Gain-Bandwidth Product.
MC33078P
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →SE5532N
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
KA4558
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC33078N Valeurs maximales et caractéristiques électriques
| Amplifier Type | Dual bipolar operational amplifier |
| Number of Amplifier Channels | 2 channels |
| Input Voltage Noise Density | 4.5 nV/√Hz |
| Gain-Bandwidth Product | 15 MHz |
| Slew Rate | 7 V/µs |
| Supply Configuration | Single-supply or dual-supply operation |
| Package Type | 8-pin Mini DIP |
| Nombre de broches | 8 pins |
| Style de montage | Through-hole |
Configuration des broches de MC33078N
| Broche 1 | OUT A — Amplifier A output |
| Broche 2 | IN- A — Amplifier A inverting input |
| Broche 3 | IN+ A — Amplifier A non-inverting input |
| Broche 4 | V- — Negative supply or ground in single-supply operation |
| Broche 5 | IN+ B — Amplifier B non-inverting input |
| Broche 6 | IN- B — Amplifier B inverting input |
| Broche 7 | OUT B — Amplifier B output |
| Broche 8 | V+ — Positive supply |
Applications typiques
MC33078N convient pour 6 applications: Stereo Audio Preamplifier, Active Audio Equalizer, Active Filter and Tone Control, Microphone Signal Conditioning, Precision Instrumentation Buffer, Audio Line Driver.
Stereo Audio Preamplifier
The MC33078N is well suited to stereo audio preamplification because its two channels share one package and its bipolar input stage combines 4.5 nV/√Hz noise density with a 15 MHz gain-bandwidth product. Each amplifier can condition one stereo channel, reducing the number of packages while preserving matched board layout. The 7 V/µs slew rate also provides useful response for audio waveforms beyond the baseband. In practice, place the IC close to the input-source circuitry, decouple the positive supply, and keep feedback routes short. Because the allowable input and output ranges depend on supply voltage and load, verify those conditions for the selected preamp gain before finalizing the biasing network.
Recommandé
Active Audio Equalizer
The MC33078N can implement active bass, midrange, or treble equalization because both channels provide the bandwidth required for practical audio-frequency networks. Its 15 MHz gain-bandwidth product leaves useful closed-loop bandwidth above the audio range, while 4.5 nV/√Hz input noise helps preserve low-level signal integrity. A dual package is especially effective for stereo-linked boost and cut sections. Stable resistor and capacitor values are important because excessive gain near the amplifier's bandwidth limit can increase sensitivity to component tolerances and parasitic capacitance. Keep the equalizer network close to the amplifier inputs, route feedback traces away from high-impedance nodes, and confirm output headroom when boost is applied.
Recommandé
Active Filter and Tone Control
The MC33078N is appropriate for second-order active filters, crossover networks, and tone-control circuits where two channels can be configured independently. Its 15 MHz gain-bandwidth product supports useful closed-loop bandwidth for audio-band filter sections, while the 7 V/µs slew rate improves large-signal behavior compared with slower general-purpose amplifiers. Component tolerances directly affect pole frequency and Q, so calculate R and C values for the intended response rather than selecting generic values. Keep sensitive input nodes away from output and supply-return currents, and place feedback components close to the relevant amplifier pins. The circuit must also remain stable with the total capacitance of the board and the connected load.
Recommandé
Microphone Signal Conditioning
The MC33078N can serve as a low-noise gain stage for microphone or line-level signals because its 4.5 nV/√Hz input-noise density is well suited to small-amplitude source amplification. The 15 MHz gain-bandwidth product provides more bandwidth than is normally required in the vocal range, allowing gain to be set with headroom for clean signal transfer. The two channels can handle a stereo pair or two sequential instrumentation paths. Use short, guarded input traces and place the input-biasing network close to the non-inverting input. Confirm the common-mode range at the actual bias point, because a high-gain microphone stage can move the signal close to a supply rail and cause clipping.
Recommandé
Precision Instrumentation Buffer
The MC33078N can buffer sensor and measurement signals when low input noise, moderate bandwidth, and bipolar input characteristics are useful. Its 4.5 nV/√Hz noise density supports small-signal amplification, while the 15 MHz gain-bandwidth product and 7 V/µs slew rate provide margin for instrumentation with transient content. The two channels allow complementary or differential functions, although the part is not a fully differential amplifier. High-impedance sensor lines should be kept short and isolated from switching nodes, and resistor networks should account for input bias-current effects. Check output settling behavior and loading for the required measurement bandwidth rather than assuming the unity-gain bandwidth applies directly to every closed-loop gain.
Recommandé
Audio Line Driver
The MC33078N is suitable for buffering and driving audio lines when the source impedance is too high for a passive connection. The 7 V/µs slew rate supports larger signal transitions, and the 15 MHz gain-bandwidth product provides more than enough nominal bandwidth for audio-band signals in ordinary closed-loop gains. Its dual-channel structure is useful for balanced stereo routing or two independent line outputs. The output must still deliver the required voltage and current into the destination load without entering distortion, so verify load impedance and output-swing limits. Keep output routing separated from input and reference nodes, and use a stable output network when driving cables or capacitive inputs.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC33078N — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC33078P | SE5532N | KA4558 |
|---|---|---|---|---|
| Package | DIP-8 | DIP-8 - same footprint | DIP-8 - same footprint | DIP-8 - same footprint |
| Brand | STMicroelectronics | Texas Instruments | Texas Instruments | STMicroelectronics |
| Number of Pins | 8 pins | 8 pins | 8 pins | 8 pins |
| Mounting Style | Through-hole | Through-hole | Through-hole | Through-hole |
| Primary Application | Low-noise audio and data-signal amplification | Audio and general-purpose dual amplification | General-purpose dual amplification | General-purpose dual amplification |
Principaux différenciateurs
- Lower listed gain-bandwidth product than MC33078P (vs MC33078P)
- Two integrated amplifiers in one through-hole package (vs SE5532N)
- Established STMicroelectronics source for the MC33078N ordering code (vs KA4558)
Notes de conception
Place the supply bypass capacitor immediately between pin 8 and the ground return, with a short and low-inductance connection. The MC33078N operates from single or dual supplies, but the usable input common-mode range and output swing change with the supply arrangement. Before finalizing the bias point, verify that the signal remains inside the datasheet limits at minimum supply voltage, maximum output amplitude, and the highest operating temperature.
Keep the non-inverting inputs, biasing resistors, and feedback components away from output pins and supply-return currents. High-impedance input nodes are especially sensitive to leakage and stray capacitance, which can shift bias voltage or alter filter response. Use a compact ground return around the amplifier and route each channel's feedback loop on the same board side where practical to minimize coupling between the two channels.
Do not assume that an eight-pin outline alone guarantees a drop-in substitution. Confirm pin functions, supply voltage, common-mode input range, output swing, noise density, gain-bandwidth product, slew rate, operating temperature, and output-current capability. A replacement that is pin-compatible can still behave differently at high gain, low supply voltage, capacitive loads, or elevated temperature, so validate the worst-case operating condition.
Informations de conformité
The available technical and product listings do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because the MC33078N is not identified as an automotive-qualified device.
