Texas Instruments MC3403N

Overview

MC3403N from STMicroelectronics is a quad bipolar operational amplifier with true differential inputs, low input bias current (500 nA max), internal compensation, and rail-to-rail output swing capability in single-supply operation down to +3 V. It delivers 1 MHz unity-gain bandwidth, 0.5 V/µs slew rate, and operates across 0°C to +70°C - widely used in sensor signal conditioning, active filters, and voltage reference circuits.

For engineers reviewing the MC3403N datasheet, MC3403N pinout, MC3403N application, or MC3403N equivalent, key selection considerations include its single-supply compatibility (+3V to +36V), class AB output stage minimizing crossover distortion, and input common-mode range extending to the negative rail - critical for ground-referenced designs without external biasing.

Technical Context

The MC3403N integrates four independent, internally compensated two-stage op-amps using bipolar junction transistor (BJT) technology. Its first stage employs split-collector transconductance reduction enabling an 8 pF compensation capacitor, while the second stage uses a current-source-loaded amplifier driving a class AB output stage that supports rail-to-ground swing in single supply and eliminates crossover distortion in dual supply.

Each amplifier features an input common-mode range inclusive of the negative supply rail, allowing direct interfacing with ground-referenced sensors or DAC outputs. The internal voltage-regulated bias network ensures stable quiescent current and low temperature drift (10 µV/°C offset drift), supporting consistent performance across industrial ambient conditions.

Key Specifications

Pinout & Package

MC3403N is housed in a 14-pin plastic dual in-line package (DIP14) with 2.54 mm lead pitch, 20.0 mm body length, and 8.5 mm body width - compatible with standard through-hole PCB layouts and socket mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad operational amplifier applications.

Compared with LM324N and TL084CN, the MC3403N uniquely balances low input bias current, short-circuit resilience, and single-supply rail-to-ground output - making it optimal for cost-sensitive, ground-referenced analog signal chains where reliability and simplicity are prioritized over ultra-low offset or high speed.

Availability

MC3403N is available at Aetrix Electronics and suitable for active filter design, sensor signal conditioning, voltage reference buffering, and oscillator circuits requiring stable component supply across prototyping, pilot production, and long-lifecycle industrial deployments.

Supply support for MC3403N 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, mixed-signal, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The MC3403N belongs to ST's legacy bipolar op-amp product line, engineered specifically for general-purpose analog signal processing in cost-sensitive, medium-performance applications - emphasizing ease of use, robustness, and broad supply voltage compatibility.

FAQ

What is the maximum operating temperature for MC3403N?

The MC3403N has an operating free-air temperature range of 0°C to +70°C, as specified in its absolute maximum ratings table. This makes it suitable for commercial and light industrial environments but not for extended-temperature applications such as under-hood automotive or outdoor telecom equipment where −40°C to +85°C or wider ranges are required.

Can MC3403N operate from a single 3.3 V supply?

Yes - the MC3403N supports single-supply operation from +3 V to +36 V. At +3.3 V, its output can swing from near ground to approximately +1.6 V (VCC − 1.7 V), and its input common-mode range includes ground. However, output headroom and slew rate are reduced versus higher supply voltages, limiting dynamic range in low-voltage precision applications.

Does MC3403N require external compensation capacitors?

No - the MC3403N is internally compensated and stable in unity-gain configuration with capacitive loads up to 100 pF. External compensation is unnecessary for standard op-amp configurations, though careful PCB layout (short traces, local bypassing) remains essential to maintain stability and minimize noise pickup.

How does MC3403N compare to UA741 in practical circuit design?

The MC3403N offers lower quiescent current (~2.8 mA total vs. ~8 mA for four UA741s), wider supply range (+3 V min vs. ±5 V min), and input common-mode range including ground - eliminating bias resistors in single-supply designs. Unlike UA741, it integrates four amplifiers per package and provides short-circuit protection, improving integration density and system robustness.