STMicroelectronics MC33079N

Overview

MC33079N from STMicroelectronics is a low-noise quad operational amplifier in a 14-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 ±14.3 V/–14.6 V output swing at ±15 V supply, enabling clean amplification in preamp and active filter stages.

For engineers reviewing the MC33079N datasheet, MC33079N pinout, MC33079N application, or MC33079N equivalent, key selection criteria include input offset drift (2 µV/°C), THD of 0.002% at 20 Hz–20 kHz, channel separation of 120 dB, and thermal resistance of 80 °C/W (DIP14) - all critical for multi-channel analog audio integrity and thermal stability.

Technical Context

The MC33079N integrates four independent high-slew-rate op-amps on a single monolithic die, each with internal frequency compensation and rail-to-rail output stage symmetry. Its 7 V/µs slew rate and 15 MHz GBP support wideband audio signals without phase distortion up to 120 kHz full-power bandwidth.

It operates over ±2.5 V to ±15 V dual supplies with input common-mode range extending to ±13 V to ±14 V, and features 100 dB CMRR and 105 dB SVR - ensuring robust rejection of power supply ripple and common-mode interference in noisy environments.

Key Specifications

Pinout & Package

DIP14 plastic through-hole package (ECOPACK® compliant), 20.0 mm × 8.5 mm body, 2.54 mm lead pitch, 3.3 mm max height. Pin 1 marked by notch or dot; top view shown in Figure 10 of ST Doc ID 4468 Rev 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad op-amp applications.

Compared with NE5534N and LM324N, MC33079N uniquely balances quad integration, 4.5 nV/√Hz noise, and 0.002% THD - making it optimal for space-constrained, high-fidelity multi-channel analog systems where thermal stability and channel isolation are design-critical.

Availability

MC33079N is available at Aetrix Electronics and suitable for professional audio mixers, Hi-Fi pre-amplifiers, active crossover networks, and multi-band graphic equalizers requiring stable component supply across extended temperature ranges (–40 °C to +125 °C).

Supply support for MC33079N 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The MC33079N belongs to ST's precision analog op-amp product line, engineered specifically for high-fidelity audio signal chains where low noise, low distortion, and channel independence are mandatory design requirements.

FAQ

What is the maximum recommended supply voltage for MC33079N?

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 above ±15 V risks exceeding thermal limits under load, especially in DIP14 packaging with 80 °C/W junction-to-ambient resistance. Derating is required above 25 °C ambient.

Does MC33079N support single-supply operation?

No - MC33079N is not specified for true single-supply use. Its input common-mode range extends only to ±13 V to ±14 V with ±15 V rails, and output swing becomes asymmetric below ±5 V supply. For single-supply designs, ST recommends the TS912 or TSV912, which feature rail-to-rail input and output.

How does MC33079N's thermal performance compare between DIP14 and SO-14 packages?

DIP14 has R_thJA = 80 °C/W; SO-14 has R_thJA = 105 °C/W. The DIP14 package dissipates heat more effectively in still air due to larger lead mass and exposed copper, making it preferable for high-output-drive applications at elevated ambient temperatures. SO-14 requires PCB copper pour and airflow for equivalent thermal margin.

Can MC33079N drive 600 Ω professional audio loads?

Yes - at ±15 V supply, MC33079N delivers ±13.2 V swing into 600 Ω (Table 3), sufficient for +24 dBu line-level signals. Output short-circuit current is 29 mA sink / 20 mA source, supporting peak currents needed for transient peaks without clipping or thermal shutdown under normal operating conditions.