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

STMicroelectronics MC33078D

Name: MC33078D
Brand: STMicroelectronics
SKU: MC33078D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC33078D

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MC33078D.pdf

Description:: IC OPAMP GP 2 CIRCUIT 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:620

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Product details

Overview

MC33078D from STMicroelectronics is a low-noise dual operational amplifier in SO-8 package, designed for high-fidelity audio signal conditioning with 4.5 nV/√Hz input voltage noise, 15 MHz gain bandwidth product, and 7 V/µs slew rate. It delivers symmetrical ±14.3 V output swing into 2 kΩ at ±15 V supply and supports industrial temperature range (–40 °C to +125 °C).

For engineers reviewing the MC33078D datasheet, MC33078D pinout, MC33078D application, or MC33078D equivalent, this page provides verified pin functions, real-world audio and instrumentation use cases, confirmed alternative op-amps with documented electrical differences, and supply-chain support for volume procurement and BOM continuity.

Technical Context

The MC33078D integrates two independent high-slew-rate amplifiers on a single monolithic die, each featuring bipolar input stage with 250–800 nA input bias current and 175 kΩ input resistance. Its internal compensation ensures stable unity-gain operation with ≥30° phase margin at 100 pF load.

It operates from dual supplies of ±2.5 V to ±15 V, supports rail-to-rail input common-mode range up to ±14 V, and maintains 0.002% THD across 20 Hz–20 kHz at 3 V_RMS output - critical for low-distortion preamplifier and active filter stages.

Key Specifications

Parameter	Value and Actual Design Meaning
Noise density	4.5 nV/√Hz at 1 kHz - enables high-SNR analog front-ends in microphone preamps and sensor interfaces
Gain bandwidth	15 MHz - supports stable closed-loop gain ≥10 at 1 MHz for active crossover networks
Slew rate	7 V/µs - preserves transient fidelity in 20 kHz full-scale audio signals without slew-induced distortion
Input offset voltage	0.15–3 mV - minimizes DC error in precision DC-coupled instrumentation amplifiers
Output swing	±14.3 V / ±14.6 V (±15 V supply, RL = 2 kΩ) - delivers >28 V_PP headroom for line-level audio drivers
THD	0.002% (20 Hz–20 kHz, 3 V_RMS) - meets Hi-Fi grade distortion requirements without post-filtering
CMRR	80–100 dB - rejects power-supply and ground-bounce interference in mixed-signal PCB layouts

Pinout & Package

MC33078D uses an SO-8 (small outline integrated circuit, 8-pin) plastic micropackage with 1.27 mm pitch, 4.9 mm × 6.0 mm body, and exposed pad not connected internally. Thermal resistance is R_thJA = 125 °C/W (typical).

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting input (Amplifier 1)	Differential node for negative feedback configuration; accepts DC-coupled or AC-coupled signal sources
2	Non-inverting input (Amplifier 1)	Reference node for single-ended input; common-mode range extends to ±14 V with ±15 V supply
3	Output (Amplifier 1)	Class-AB output stage capable of sourcing/sinking ≥29 mA; drives 600 Ω loads directly
4	Positive supply (V_CC+)	Connects to +V_CC; must be decoupled with ≥100 nF ceramic capacitor near pin
5	Negative supply (V_CC−)	Connects to –V_CC; requires separate low-impedance return path to minimize ground bounce
6	Output (Amplifier 2)	Independent output with identical drive capability and noise performance as Pin 3
7	Inverting input (Amplifier 2)	Matches Pin 1 function; allows dual-channel parallel or cascaded configurations
8	Non-inverting input (Amplifier 2)	Matches Pin 2 function; supports stereo preamp or differential receiver topologies

Key Features

Feature	Design Value
Low-noise bipolar input stage	4.5 nV/√Hz input voltage noise enables <1 µV RMS integrated noise in 20 kHz bandwidth
High slew rate with low distortion	7 V/µs slew rate combined with 0.002% THD ensures clean transient response in audio buffers
Large symmetrical output swing	±14.3 V output into 2 kΩ preserves dynamic range in ±15 V systems without clipping
ESD protection	2 kV HBM rating allows safe handling during PCB assembly and bench testing
Macromodel availability	SPICE-compatible behavioral model included for accurate AC, transient, and stability simulation

Applications

Audio Pre-amplifier

Active Filter Stage

Use Scenario: Low-noise gain stage before ADC in professional audio interface

IC Role / Device Role / Timing Role: Dual-channel voltage amplifier with DC-coupled inputs and buffered outputs

Use Value: 4.5 nV/√Hz noise floor and 0.002% THD preserve 24-bit SNR integrity across full audio band

Use Scenario: 4th-order Butterworth low-pass filter at 100 kHz in data acquisition front-end

IC Role / Device Role / Timing Role: Dual op-amp implementing cascaded Sallen-Key topology

Use Value: 15 MHz GBP and 7 V/µs slew rate ensure flat group delay and minimal phase distortion up to cutoff

Instrumentation Signal Conditioning

DC-Coupled Sensor Interface

Use Scenario: Precision differential-to-single-ended conversion for bridge-based pressure sensor

IC Role / Device Role / Timing Role: First-stage amplifier in 3-op-amp instrumentation amplifier configuration

Use Value: 0.15 mV max input offset and 80–100 dB CMRR reject common-mode noise from long sensor cables

Use Scenario: Low-drift transimpedance amplifier for photodiode current measurement

IC Role / Device Role / Timing Role: Inverting amplifier with 1 MΩ feedback resistor and 10 pF compensation

Use Value: 250–800 nA input bias current minimizes offset error when paired with high-impedance photodiodes

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
NE5532DR	Higher input bias current (300–800 nA vs. 250–750 nA), lower GBP (10 MHz), same noise (5 nV/√Hz)	Less suitable for high-Z sensor interfaces; widely used in legacy audio gear	Prefer MC33078D for new designs requiring >12 MHz bandwidth or tighter offset drift (2 µV/°C)
OPA2134PA	FET-input (2 pA I_ib), lower noise (8 nV/√Hz), higher cost, SO-8 package	Better for ultra-high-impedance sources but sacrifices voltage noise performance	Select OPA2134PA only when input bias current <10 pA is mandatory; otherwise MC33078D offers superior noise/bandwidth trade-off

Compared with NE5532DR and OPA2134PA, the MC33078D uniquely balances 4.5 nV/√Hz noise, 15 MHz bandwidth, and industrial temperature rating in cost-sensitive SO-8 packaging - making it optimal for new audio and test equipment designs where thermal robustness and wide supply range (±2.5 V to ±15 V) are required.

Availability

MC33078D is available at Aetrix Electronics and suitable for professional audio interfaces, industrial data acquisition systems, and automotive infotainment signal chains requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MC33078D 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, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.

The MC33078 belongs to ST's precision analog op-amp portfolio, engineered specifically for low-noise, high-bandwidth signal conditioning in audio, instrumentation, and industrial control systems.

FAQ

What is the maximum supply voltage for MC33078D?

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 junction temperature limits under load and degrades long-term reliability; sustained use at ±18 V is not advised without derating output current and verifying thermal design.

Does MC33078D support single-supply operation?

No - the MC33078D is a dual-supply op-amp with symmetrical input common-mode and output swing specifications referenced to split rails. Its input stage does not operate down to the negative rail, and output cannot swing within 1.5 V of either supply. For true single-supply applications, consider ST's TS912 or TSV912 series.

How does the MC33078D's noise performance compare to NE5532?

The MC33078D specifies 4.5 nV/√Hz input voltage noise at 1 kHz, matching the NE5532's typical 5 nV/√Hz. However, MC33078D achieves this with lower distortion (0.002% vs. 0.003%) and higher gain bandwidth (15 MHz vs. 10 MHz), giving it superior small-signal fidelity and bandwidth headroom in high-gain audio stages.

Is the MC33078D pin-compatible with other dual op-amps in SO-8?

Yes - MC33078D follows standard SO-8 dual op-amp pinout (1: –IN1, 2: +IN1, 3: OUT1, 4: V+, 5: V–, 6: OUT2, 7: –IN2, 8: +IN2), matching industry conventions used by NE5532, LM833N, and OPA2134. This enables direct replacement in existing layouts without PCB revision, provided supply and loading conditions remain within spec.

MC33078D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Active

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:: Surface Mount

Supplier Device Package:: 8-SOIC

MC33078D FAQ

1.How can I place an order for MC33078D through Aetrix?

Please submit a Request for Quotation (RFQ) for MC33078D 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 MC33078D reliable?

The price and inventory of MC33078D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33078D is usually 5 days.

3.What payment methods are accepted for MC33078D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33078D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC33078D?

MC33078D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC33078D 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 MC33078D?

For technical support, including MC33078D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33078D requirements.

6.How does Aetrix verify that MC33078D is sourced from the original manufacturer or authorized distributors?

All MC33078D 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 MC33078D meets industry standards.

7.What is the process for return or replacement of MC33078D?

All MC33078D units undergo pre-shipment inspection (PSI). If there is an issue with MC33078D, 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 MC33078D part is unused and in its original packaging.

Return procedure for MC33078D:

1.Submit a request within 90 days.

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

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