Texas Instruments MC3403D

Overview

MC3403D from STMicroelectronics is a quad bipolar operational amplifier with true differential inputs, internally compensated for unity-gain stability, low input bias current (500 nA max), rail-to-rail output swing capability in single-supply mode (down to ground), and operation from +3 V to +36 V or ±15 V to ±18 V supplies - used in precision analog signal conditioning, sensor interface, and active filter circuits.

For engineers reviewing the MC3403D datasheet, MC3403D pinout, MC3403D application, or MC3403D equivalent, key selection criteria include input offset voltage (6 mV max), common-mode input range extending to V–, short-circuit protected outputs, class AB output stage for minimal crossover distortion, and compatibility with 14-pin SOIC footprint for space-constrained industrial control modules.

Technical Context

The MC3403D integrates four independent two-stage op-amps with a transconductance-reduced input stage enabling use of only an 8 pF compensation capacitor, reducing die area while maintaining 1 MHz unity-gain bandwidth and 0.35 V/µs slew rate. Each amplifier features internal biasing from a low-temperature-coefficient voltage regulator, ensuring stable quiescent current across temperature.

Its input common-mode range includes the negative supply rail - eliminating external level-shifting components in single-supply configurations - and its class AB output stage supports rail-to-ground swing without crossover distortion in split-supply operation, unlike legacy UA741 derivatives.

Key Specifications

Pinout & Package

MC3403D is housed in a 14-pin Small Outline Integrated Circuit (SOIC-14) package, measuring 8.75 mm × 6.2 mm × 1.75 mm (max), with gull-wing leads and 1.27 mm pitch - compatible with standard surface-mount reflow profiles and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM324DR and TL084CDR, MC3403D uniquely balances single-supply usability (down to +3 V), short-circuit robustness, and 0.02% THD - making it optimal for cost-sensitive yet performance-critical analog subsystems in programmable logic controllers and embedded test equipment.

Availability

MC3403D is available at Aetrix Electronics and suitable for industrial process control, sensor signal conditioning, and active filter design requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MC3403D 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 MEMS products for industrial, automotive, and consumer markets.

The MC3403 belongs to ST's legacy bipolar op-amp product line, engineered specifically for robust, low-cost analog signal processing in harsh industrial environments - emphasizing supply flexibility, thermal stability, and fault tolerance over ultra-low-noise or high-speed specs.

FAQ

Can MC3403D operate from a single +5 V supply?

Yes. The MC3403D supports single-supply operation from +3 V to +36 V. At +5 V, its output can swing from near ground to approximately +3.3 V (VCC – 1.7 V) with 10 kΩ load, and input common-mode range includes 0 V - enabling direct interface with 5 V microcontrollers without level shifters.

Is MC3403D pin-compatible with LM324?

No. While both are quad op-amps in 14-pin packages, MC3403D uses standard SOIC-14 pinout (V– at Pin 4, V+ at Pin 11), whereas LM324 places V– at Pin 4 but assigns different functions to Pins 1, 7, 8, and 14 - requiring PCB redesign for substitution.

What is the maximum junction temperature for continuous operation?

The absolute maximum junction temperature is +150°C. With 500 mW total power dissipation rating and SOIC-14 thermal resistance (θ_JA) of 125°C/W, sustained operation above +70°C ambient requires derating or heatsinking - confirmed by ST's datasheet Section "Absolute Maximum Ratings".

Does MC3403D support rail-to-rail input or output?

It supports rail-to-rail output swing down to ground in single-supply mode, but input common-mode range extends only to V– (not to V+). The maximum input voltage is limited to V+ – 1.5 V per datasheet - so at +36 V supply, inputs must stay ≤ +34.5 V.