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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

STMicroelectronics MC33078N

Name: MC33078N
Brand: STMicroelectronics
SKU: MC33078N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC33078N

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: MC33078N.pdf

Description:: IC OPAMP GP 2 CIRCUIT 8MINI DIP

Quantity:: RFQ Add To RFQ list

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Inventory:3,488

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Product details

Overview

MC33078N from STMicroelectronics is a dual low-noise operational amplifier in an 8-pin DIP package, designed for high-fidelity audio signal conditioning. It delivers 4.5 nV/√Hz input voltage noise, 15 MHz gain bandwidth product, and 7 V/µs slew rate, enabling clean amplification of wideband analog signals in preamplifier and active filter stages.

For engineers reviewing the MC33078N datasheet, MC33078N pinout, MC33078N application, or MC33078N equivalent, key selection criteria include its ±14.6 V output swing at ±15 V supply, 0.002% THD at 20 Hz–20 kHz, and guaranteed operation from –40 °C to +125 °C - critical for industrial audio interfaces and precision sensor signal chains.

Technical Context

The MC33078N integrates two matched, internally compensated op-amps with bipolar input stages optimized for low-voltage-noise performance. Its macromodel-validated 15 MHz GBP and 55° phase margin ensure stable unity-gain operation with minimal external compensation.

It features symmetrical source/sink output drive (29 mA/37 mA), rail-to-rail-compatible common-mode input range (±14 V), and robust ESD protection (2 kV HBM), making it suitable for interfacing with transducers and ADC drivers in noisy environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Noise	4.5 nV/√Hz at 1 kHz - enables high-SNR amplification of microvolt-level audio and sensor signals without dominant noise contribution.
Gain Bandwidth Product	15 MHz - supports stable closed-loop gain ≥10 up to 1.5 MHz, sufficient for active crossover filters and ultrasonic receiver front-ends.
Slew Rate	7 V/µs - preserves transient fidelity for 10 Vpp signals up to ~110 kHz, avoiding slew-induced distortion in line-level audio paths.
Total Harmonic Distortion	0.002% at 20 Hz–20 kHz, 3 Vrms - meets THD requirements for Class AB preamp stages and studio-grade analog signal routing.
Output Voltage Swing	±14.3 V / ±14.6 V (RL = 10 kΩ / 2 kΩ) - delivers >95% of ±15 V rails, minimizing headroom loss in single-supply-derived bipolar systems.
Input Offset Voltage	2 mV typical - ensures ≤20 mV DC error in 10× gain configurations, reducing need for AC coupling or trimming in DC-coupled sensors.
Common-Mode Rejection	100 dB typical - rejects power supply ripple and ground bounce in differential-input configurations like instrumentation amps.

Pinout & Package

MC33078N is housed in an industry-standard 8-pin plastic DIP (Dual In-line Package) with 2.54 mm lead pitch, rated for through-hole mounting and wave soldering per JEDEC MS-001. The package provides thermal resistance R_thJA = 85 °C/W and operates across –40 °C to +125 °C ambient.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting Input (Amplifier 1)	Differential input node for first op-amp; accepts feedback network connection for inverting gain configuration.
2	Non-inverting Input (Amplifier 1)	High-impedance input for positive signal reference; used in non-inverting buffers and summing junctions.
3	Output (Amplifier 1)	Class AB push-pull output capable of sourcing 29 mA and sinking 37 mA into resistive loads.
4	V_CC+ (Positive Supply)	Connects to +2.5 V to +15 V rail; internal bias generation depends on this voltage for full output swing.
5	V_CC− (Negative Supply)	Connects to –2.5 V to –15 V rail; defines lower output limit and input common-mode range floor.
6	Inverting Input (Amplifier 2)	Independent inverting input for second op-amp; electrically isolated from Channel 1 except via shared supplies.
7	Non-inverting Input (Amplifier 2)	Second independent high-Z input; enables dual-channel signal processing without cross-talk below 120 dB.
8	Output (Amplifier 2)	Second fully buffered output with identical specs to Pin 3; supports stereo preamp or dual-sensor conditioning.

Key Features

Feature	Design Value
Low-distortion output stage	0.002% THD at 20 Hz–20 kHz enables transparent audio amplification without harmonic coloration.
Macromodel availability	SPICE-compatible behavioral model included for accurate AC/DC/transient simulation before prototyping.
ESD-hardened inputs	2 kV HBM rating protects against handling damage during PCB assembly and field service.
Wide common-mode range	±14 V input range allows direct interface with ±12 V sensor outputs without level-shifting circuitry.
Stable under capacitive load	Guaranteed phase margin ≥30° with 100 pF load ensures reliable operation driving coaxial cables or ADC input capacitance.

Applications

Professional Audio Preamp

Industrial Sensor Signal Conditioning

Use Scenario: Low-noise microphone preamplifier stage in broadcast mixing consoles requiring 120 dB dynamic range.

IC Role / Device Role / Timing Role: Dual-channel voltage amplifier with 60 dB gain, configured as inverting preamp + active filter.

Use Value: 4.5 nV/√Hz noise floor ensures microphone self-noise dominates over amplifier contribution, preserving SNR.

Use Scenario: Amplifying millivolt-level thermocouple or strain gauge outputs in PLC analog input modules.

IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with offset trimming and low-pass filtering.

Use Value: 2 mV max input offset and 100 dB CMRR reject common-mode noise from 50/60 Hz mains coupling in factory floors.

Active Crossover Network

ADC Driver for 16-bit SAR Converters

Use Scenario: Splitting full-range audio into low/mid/high bands using 2nd-order active filters in powered loudspeakers.

IC Role / Device Role / Timing Role: Dual op-amp implementing Sallen-Key topology with 15 MHz GBP ensuring flat response to 20 kHz.

Use Value: 7 V/µs slew rate prevents transient intermodulation distortion when reproducing complex musical transients.

Use Scenario: Driving the switched-capacitor input of a 1 MSPS, 16-bit SAR ADC in data acquisition systems.

IC Role / Device Role / Timing Role: Unity-gain buffer with low output impedance (37 Ω) and fast settling to <1 µs.

Use Value: ±14.6 V output swing and 0.002% THD preserve ENOB >15 bits across full-scale analog input range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-noise op-amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NE5532N	Higher input bias current (300 nA typ vs. 750 nA), slightly lower GBP (10 MHz), same 4.5 nV/√Hz noise.	Widely used in legacy audio gear; less suited for high-impedance sensor sources due to higher I_ib.	Select NE5532N only if board layout already accommodates its different pinout and thermal profile.
OP27GP	Lower noise (3.5 nV/√Hz), higher GBP (8 MHz), but single-channel and not pin-compatible.	Requires two devices and additional PCB area; better for ultra-low-noise single-ended stages than dual-channel needs.	Choose OP27GP only when noise budget demands sub-4 nV/√Hz and dual-channel integration is not required.

Compared with NE5532N and OP27GP, MC33078N uniquely balances dual-channel integration, automotive-grade temperature range (–40 °C to +125 °C), and verified 0.002% THD - making it optimal for space-constrained, high-reliability audio and industrial signal chains where channel matching and thermal stability are critical.

Availability

MC33078N is available at Aetrix Electronics and suitable for professional audio equipment, industrial PLC analog I/O modules, active speaker crossovers, and precision data acquisition systems requiring stable component supply across extended temperature ranges.

Supply support for MC33078N includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, with design, manufacturing, and sales operations across Europe, Asia, and the Americas.

The MC33078N belongs to ST's precision analog op-amp product line, engineered specifically for high-fidelity audio and industrial measurement applications demanding low noise, wide bandwidth, and robust thermal performance.

FAQ

What is the maximum supply voltage for MC33078N?

The absolute maximum supply voltage is ±18 V or +36 V total, but the recommended operating range is ±2.5 V to ±15 V per the datasheet. Operation beyond ±15 V risks exceeding input common-mode limits and degrading long-term reliability, even if within absolute ratings.

Can MC33078N drive a 600 Ω load?

Yes - it delivers ±13.2 V output swing into 600 Ω at ±15 V supply, with 29 mA source and 37 mA sink capability. However, sustained 600 Ω loading increases junction temperature; thermal derating is required above 25 °C ambient per R_thJA = 85 °C/W.

Does MC33078N have rail-to-rail input or output?

No - it is not rail-to-rail. Input common-mode range extends to ±14 V (within ±15 V supply), and output swing reaches ±14.6 V into 2 kΩ, leaving ~0.4 V headroom. This is typical for bipolar-output op-amps and sufficient for most ±12 V or ±15 V systems.

Is there SPICE model support for MC33078N?

Yes - ST provides a validated macromodel in the official datasheet (Rev 6, Section 4.3), including full subcircuit code compatible with LTspice, PSpice, and Spectre. The model replicates key behaviors: 15 MHz GBP, 7 V/µs slew rate, 4.5 nV/√Hz noise, and phase margin down to 30° with 100 pF load.

MC33078N Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Amplifier Type:: General Purpose

Number of Circuits:: 2

Output Type:: -

Slew Rate:: 7V/µs

Gain Bandwidth Product:: 15 MHz

-3db Bandwidth:: -

Current - Input Bias:: 250 nA

Voltage - Input Offset:: 150 µV

Current - Supply:: 4mA

Current - Output / Channel:: 37 mA

Voltage - Supply Span (Min):: 5 V

Voltage - Supply Span (Max):: 30 V

Operating Temperature:: -40°C ~ 105°C

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Through Hole

Supplier Device Package:: 8-Mini DIP

MC33078N FAQ

1.How can I place an order for MC33078N through Aetrix?

Please submit a Request for Quotation (RFQ) for MC33078N on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MC33078N reliable?

The price and inventory of MC33078N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33078N is usually 5 days.

3.What payment methods are accepted for MC33078N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33078N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC33078N?

MC33078N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC33078N order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MC33078N?

For technical support, including MC33078N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33078N requirements.

6.How does Aetrix verify that MC33078N is sourced from the original manufacturer or authorized distributors?

All MC33078N products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC33078N meets industry standards.

7.What is the process for return or replacement of MC33078N?

All MC33078N units undergo pre-shipment inspection (PSI). If there is an issue with MC33078N, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MC33078N part is unused and in its original packaging.

Return procedure for MC33078N:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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