LM3403N Quad Operational Amplifier

Overview

The LM3403N is a monolithic quad operational amplifier that integrates four independent, high-gain, internally frequency-compensated op-amps into a single package. Designed for versatility, it operates efficiently from a single power supply (3.0V to 36V) or dual power supplies (±1.5V to ±18V). The device is engineered to deliver robust performance with minimal external biasing requirements, making it suitable for a wide range of analog applications. Its input common-mode voltage range includes the negative supply, simplifying circuit design by eliminating the need for additional biasing components.

Features

• Input Common-Mode Voltage Range Includes Ground/Negative Supply: Enables operation without external biasing in many applications.
• Output Voltage Swing to Ground/Negative Supply: Maximizes dynamic range in single-supply configurations.
• Four Internally Compensated Op-Amps: Integrated in a single package for space-efficient designs.
• Wide Power Supply Range: Supports single-supply (3.0V to 36V) or dual-supply (±1.5V to ±18V) operation.
• Class AB Output Stage: Minimizes crossover distortion for improved signal fidelity.
• Short-Circuit Protected Outputs: Enhances reliability in fault conditions.
• High Open-Loop Gain (200k): Ensures precision in amplification tasks.
• LM741-Type Performance: Familiar behavior for engineers transitioning from legacy designs.

Applications

The LM3403N is widely used in analog signal processing and control systems. Key applications include:

• Filters: Active low-pass, high-pass, band-pass, and notch filters.
• Voltage-Controlled Oscillators (VCOs): Precision frequency generation for communication and instrumentation systems.
• Signal Conditioning: Amplification, buffering, and level shifting in sensor interfaces.
• Power Supply Control: Error amplification in voltage regulators and feedback loops.
• Audio Processing: Preamplifiers, mixers, and tone control circuits.

Electrical Characteristics

The following specifications are typical for the LM3403N under recommended operating conditions (TA = 25°C, VCC = ±15V unless otherwise noted):

• Input Offset Voltage: 2 mV (max)
• Input Bias Current: 30 nA (max)
• Input Offset Current: 5 nA (max)
• Common-Mode Rejection Ratio (CMRR): 90 dB (min)
• Supply Voltage Rejection Ratio (SVRR): 96 dB (min)
• Large-Signal Voltage Gain: 200 V/mV (min, RL = 2 kΩ)
• Output Voltage Swing: ±13 V (min, RL = 2 kΩ)
• Slew Rate: 0.5 V/μs (typ)
• Gain Bandwidth Product: 1 MHz (typ)
• Power Consumption (per Amplifier): 1.7 mA (typ)

Absolute Maximum Ratings

Stresses beyond these values may cause permanent damage. Functional operation is not implied under these conditions.

• Supply Voltage (VCC): ±18V or 36V
• Input Voltage Range: ±15V
• Differential Input Voltage: ±30V
• Output Short-Circuit Duration: Continuous (with proper heat dissipation)
• Operating Temperature Range: 0°C to +70°C (LM3403N)
• Storage Temperature Range: -65°C to +150°C
• Junction Temperature: +150°C

Package Information

The LM3403N is available in multiple package options to suit different assembly requirements:

• 14-Lead Molded DIP (N14A): Through-hole mounting for prototyping and industrial applications.
• 14-Lead Ceramic DIP (J14A): High-reliability option for military/aerospace applications.
• 14-Lead SOIC (M14A): Surface-mount package for compact PCB designs.

Connection Diagram (14-Lead DIP/SOIC)

Pinout configuration (top view):

• Pin 1: Output 1
• Pin 2: Inverting Input 1
• Pin 3: Non-Inverting Input 1
• Pin 4: VCC+
• Pin 5: Non-Inverting Input 2
• Pin 6: Inverting Input 2
• Pin 7: Output 2
• Pin 8: Output 3
• Pin 9: Inverting Input 3
• Pin 10: Non-Inverting Input 3
• Pin 11: VCC-
• Pin 12: Non-Inverting Input 4
• Pin 13: Inverting Input 4
• Pin 14: Output 4

Ordering Information

The LM3403N is part of a family of quad op-amps with varying package and performance options:

• LM3303J: Ceramic DIP (J14A)
• LM3303N: Molded DIP (N14A)
• LM3303M: Molded Surface Mount (M14A)
• LM3403J: Ceramic DIP (J14A)
• LM3403N: Molded DIP (N14A) – Standard commercial grade
• LM3403M: Molded Surface Mount (M14A)

Design Considerations

Thermal Management

When operating at high supply voltages or driving low-impedance loads, ensure adequate heat dissipation via PCB copper area or external heatsinks for DIP packages.

Stability

Although internally compensated, avoid capacitive loads >100 pF directly on outputs without isolation resistors to prevent oscillation.

Power Supply Decoupling

Use 0.1 μF ceramic capacitors close to VCC+ and VCC- pins to minimize noise and improve transient response.