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STMicroelectronics MC33079DT
- Part No.:
- MC33079DT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33079DT.pdf
- Description:
- IC AUDIO 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,829
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Product details
Overview
MC33079DT from STMicroelectronics is a low-noise quad operational amplifier optimized 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, with ±14.3 V output swing into 2 kΩ at ±15 V supply. It is used in professional audio preamplifiers, active crossover networks, and studio-grade mixing console channels.
For engineers reviewing the MC33079DT datasheet, MC33079DT pinout, MC33079DT application, or MC33079DT equivalent, key selection criteria include input voltage noise density, THD (0.002%), channel separation (120 dB), thermal resistance (105 °C/W for SO-14), and automotive-grade qualification status of related variants.
Technical Context
The MC33079DT integrates four independent high-slew-rate op-amps on a single monolithic bipolar die, featuring internally compensated unity-gain-stable architecture with 9 MHz unity-gain bandwidth. Its input stage uses matched NPN transistors to achieve low offset drift (2 µV/°C) and low input bias current (250–800 nA).
Output stage design enables symmetrical sourcing and sinking (15–37 mA), large linear output swing (±14.6 V), and stable phase margin (30° at 100 pF load). ESD protection meets 2 kV HBM, supporting robust handling in automated assembly environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise density | 4.5 nV/√Hz at 1 kHz - enables low-noise microphone preamp stages without audible hiss |
| Gain bandwidth | 15 MHz - supports wideband audio processing up to 200 kHz with minimal phase error |
| Slew rate | 7 V/µs - preserves transient fidelity in fast-rising audio signals (e.g., drum transients) |
| THD | 0.002% at 20 Hz–20 kHz - meets professional audio line-level distortion requirements |
| Output swing | ±14.3 V / ±14.6 V (positive/negative) into 2 kΩ - maximizes dynamic range at ±15 V supply |
| Channel separation | 120 dB - prevents crosstalk between stereo or multi-channel audio paths |
| Supply range | ±2.5 V to ±15 V - compatible with legacy ±12 V and modern ±15 V audio rails |
Pinout & Package
MC33079DT is supplied in a 14-lead SOIC (SO-14) plastic micropackage, 8.55–8.75 mm × 5.8–6.2 mm body, 1.27 mm pitch, with gull-wing leads and 0.35–0.46 mm lead width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input (AMP1) | High-impedance differential node for first op-amp; referenced to common-mode range ±13–14 V |
| 2 | Non-inverting input (AMP1) | Matches Pin 1 in offset and noise; used for unity-gain buffer or non-inverting gain configurations |
| 3 | Output (AMP1) | Class-AB output capable of ±37 mA sink/source; drives 600 Ω loads to ±13.2 V |
| 4 | VCC− | Negative supply rail connection; must be decoupled locally to minimize ground bounce |
| 5 | Inverting input (AMP2) | Electrically isolated from AMP1 inputs; enables independent feedback network design |
| 6 | Non-inverting input (AMP2) | Independent biasing path; allows dual-channel instrumentation front-end implementation |
| 7 | Output (AMP2) | Matched AC performance to Pin 3; supports stereo or differential pair buffering |
| 8 | Output (AMP3) | Third channel output; identical DC/AC specs - usable for active filter summing nodes |
| 9 | Non-inverting input (AMP3) | Provides dedicated input for third amplifier; avoids routing congestion in dense PCB layouts |
| 10 | Inverting input (AMP3) | Supports inverting configuration for third channel without shared trace coupling |
| 11 | VCC+ | Positive supply rail; requires 100 nF ceramic + 10 µF tantalum local decoupling |
| 12 | Inverting input (AMP4) | Fourth independent input; enables 4-channel active crossover or multi-band EQ |
| 13 | Non-inverting input (AMP4) | Allows full quad configuration with separate gain-setting resistors per channel |
| 14 | Output (AMP4) | Final channel output; maintains 120 dB channel separation up to 20 kHz |
Key Features
| Feature | Design Value |
|---|---|
| Low input voltage noise | 4.5 nV/√Hz enables <1 µVrms integrated noise in 20 Hz–20 kHz audio band |
| High channel separation | 120 dB minimizes inter-channel leakage in stereo/multi-track recording systems |
| Thermal stability | 2 µV/°C offset drift ensures consistent DC balance across industrial temperature range (−40°C to +125°C) |
| Robust ESD rating | 2 kV HBM allows safe handling during SMT placement and board rework without added protection circuitry |
| Wide supply flexibility | Operates from ±2.5 V to ±15 V - supports both battery-powered portable gear and mains-powered consoles |
Applications
| Professional Audio Preamp | Active Crossover Network |
|---|---|
Use Scenario: Low-noise amplification of dynamic microphone signals before ADC conversion in digital audio workstations. IC Role / Device Role / Timing Role: First-stage gain block with 60 dB fixed gain, configured as inverting amplifier with precision metal-film feedback network. Use Value: 4.5 nV/√Hz noise floor preserves SNR > 110 dB(A) over full audio bandwidth without requiring external cooling. | Use Scenario: Frequency-dependent signal routing in 3-way loudspeaker systems using 2nd-order Butterworth filters. IC Role / Device Role / Timing Role: Quad op-amp implements four simultaneous 2-pole low-pass/high-pass sections with matched component sensitivity. Use Value: 120 dB channel separation prevents bass-midrange leakage, preserving acoustic imaging accuracy. |
| Studio Mixing Console Channel | Automotive Infotainment Line Driver |
Use Scenario: Summing, equalization, and level control per channel in analog broadcast mixing desks. IC Role / Device Role / Timing Role: Dual op-amps per channel: one for EQ section (inverting topology), one for output driver (non-inverting unity-gain buffer). Use Value: ±14.6 V output swing into 600 Ω delivers +24 dBu line level with headroom for peak transients. | Use Scenario: Driving balanced/unbalanced audio outputs from head unit SoCs to rear-seat entertainment displays. IC Role / Device Role / Timing Role: Output buffer with DC-coupled interface to 10 kΩ input impedance of downstream DAC or amplifier IC. Use Value: 0.002% THD ensures compliance with OEM infotainment audio quality specifications (e.g., Ford Q1, GM World Class). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE5534AD | Single-channel only; higher noise (5 nV/√Hz); no quad variant available | Requires four separate packages for quad functionality; increases board area and layout complexity | Select when needing highest possible slew rate (13 V/µs) in single-channel critical paths |
| LM324DT | Lower noise (35 nV/√Hz); lower GBP (1.2 MHz); rail-to-rail output not supported | Acceptable for cost-sensitive consumer audio but fails professional THD/noise targets | Select only for non-audio signal conditioning where bandwidth and noise are secondary |
Compared with NE5534AD and LM324DT, MC33079DT uniquely balances quad integration, 4.5 nV/√Hz noise, and 0.002% THD-making it the only drop-in solution for space-constrained, high-SNR audio designs requiring four matched channels.
Availability
MC33079DT is available at Aetrix Electronics and suitable for professional audio equipment, active speaker management systems, and automotive infotainment line drivers requiring stable component supply and long-term manufacturability.
Supply support for MC33079DT 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The MC33079 belongs to ST's precision analog op-amp product line, engineered specifically for high-SNR audio signal chains where low noise, low distortion, and channel matching are mandatory design requirements.
FAQ
What is the maximum recommended supply voltage for continuous operation?
The absolute maximum supply voltage is ±18 V or +36 V total, but continuous operation above ±15 V is not recommended due to increased junction temperature and reduced reliability. The specified operating range is ±2.5 V to ±15 V, with thermal resistance of 105 °C/W (SO-14) limiting power dissipation at higher voltages.
Does MC33079DT support rail-to-rail input or output?
No. MC33079DT has standard bipolar input stage with common-mode input range of ±13 V to ±14 V (at ±15 V supply), and output swing limited to ±14.6 V. It does not achieve true rail-to-rail operation; output cannot reach within 0.4 V of either supply rail under load.
Is MC33079DT qualified for automotive applications?
The MC33079DT itself is not automotive-qualified; however, the pin-compatible MC33079YDT variant is AEC-Q100 qualified and screened per AEC-Q001/Q002. MC33079DT is rated for −40°C to +125°C operation but lacks automotive-specific stress testing and documentation.
Can MC33079DT drive 600 Ω loads effectively?
Yes. At ±15 V supply, it delivers ±13.2 V output swing into 600 Ω (13.2 V / 600 Ω = 22 mA), well within its 37 mA sink capability. THD remains ≤0.002% at 3 Vrms output, confirming suitability for professional line-driving applications.
MC33079DT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 7V/µs
- Gain Bandwidth Product:
- 15 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 250 nA
- Voltage - Input Offset:
- 2.5 mV
- Current - Supply:
- 8mA
- Current - Output / Channel:
- 37 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
MC33079DT FAQ
1.How can I place an order for MC33079DT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33079DT 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 MC33079DT reliable?
The price and inventory of MC33079DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33079DT is usually 5 days.
3.What payment methods are accepted for MC33079DT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33079DT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33079DT?
MC33079DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33079DT 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 MC33079DT?
For technical support, including MC33079DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33079DT requirements.
6.How does Aetrix verify that MC33079DT is sourced from the original manufacturer or authorized distributors?
All MC33079DT 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 MC33079DT meets industry standards.
7.What is the process for return or replacement of MC33079DT?
All MC33079DT units undergo pre-shipment inspection (PSI). If there is an issue with MC33079DT, 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 MC33079DT part is unused and in its original packaging.
Return procedure for MC33079DT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC33079DT Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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