Analog Devices 42J FET Amplifier

The Analog Devices 42J is a FET amplifier engineered for measurement and signal processing applications. Built on precision JFET-input architecture, it delivers excellent linearity and exceptionally low noise performance. The device maintains stable operation across a wide range of environmental conditions, making it suitable for sensitive instrumentation and data acquisition systems.

Technical Specifications

• Amplifier Type: FET Amplifier


• Bias Current: 0.15 pA


• Noise Characteristics: Low noise


• Linearity: Excellent linearity


• Product Family: Analog Devices 41 and 42 Series FET Amplifiers

Key Features The 42J delivers ultra-low input bias current at 0.15 pA, making it ideal for high-impedance sensor interfaces where leakage current degradation must be minimized. Exceptional linearity across the operating range enables accurate signal reproduction in instrumentation amplifier topologies and precision measurement circuits. Environmental stability ensures predictable performance without thermal compensation in field deployments.

Typical Applications

• High impedance sensor amplification


• Precision current measurements using shunts


• Photodiode preamplifiers


• Instrumentation amplifiers


• Buffer amplifiers


• Log amplifiers


• Sample and hold circuits


• Peak detectors


• Signal conditioning for data acquisition systems


• High-speed ADC and DAC signal chains

Compatibility & Integration The 42J is part of Analog Devices' 41 and 42 Series FET amplifier family, designed for integration into precision analog signal chains. Pin and functional compatibility with related series amplifiers enables straightforward design migration and system scalability.