LF353N Dual JFET Input Operational Amplifier

Overview

The LF353N is a high-speed, dual JFET input operational amplifier that combines low cost with high performance. Utilizing advanced BI-FET II™ technology, this device features an internally trimmed input offset voltage, ensuring precision and stability in a wide range of applications. The LF353N is designed to operate with low supply current while maintaining a large gain bandwidth product and fast slew rate. Its well-matched high-voltage JFET input devices contribute to very low input bias and offset currents, making it ideal for precision analog circuits.

This amplifier is pin-compatible with the standard LM1558, allowing for seamless upgrades in existing designs without requiring significant modifications. The LF353N is widely used in audio processing, active filters, and instrumentation due to its robust performance and reliability.

Features

• Internally Trimmed Offset Voltage: 10 mV maximum ensures high precision.
• Low Input Bias and Offset Currents: JFET input stage minimizes errors in high-impedance circuits.
• High Speed: Large gain bandwidth product and fast slew rate for dynamic signal processing.
• Low Power Consumption: Operates efficiently with minimal supply current.
• Pin-Compatible with LM1558: Easy drop-in replacement for legacy designs.
• Wide Supply Voltage Range: Supports flexible power supply configurations.
• Low Noise: Suitable for sensitive analog signal amplification.

Applications

The LF353N is versatile and finds use in a variety of electronic circuits, including:

• Audio Processing: Preamplifiers, tone control circuits, and active filters.
• Instrumentation Amplifiers: High-precision measurement systems.
• Active Filters: Low-pass, high-pass, and band-pass filter designs.
• Signal Conditioning: Analog signal amplification and buffering.
• Data Acquisition Systems: Analog-to-digital converter (ADC) drivers.
• Medical Electronics: Biomedical signal amplification with low noise.

Electrical Characteristics

The following table summarizes the key electrical specifications of the LF353N under typical operating conditions (unless otherwise noted):

• Supply Voltage Range: ±5V to ±18V
• Input Offset Voltage: 5 mV (max 10 mV)
• Input Bias Current: 50 pA (typical)
• Input Offset Current: 25 pA (typical)
• Gain Bandwidth Product: 4 MHz (typical)
• Slew Rate: 13 V/µs (typical)
• Common Mode Rejection Ratio (CMRR): 100 dB (typical)
• Power Supply Rejection Ratio (PSRR): 100 dB (typical)
• Operating Temperature Range: -25°C to +85°C

Detailed Performance Characteristics

The LF353N exhibits excellent performance across a broad range of operating conditions. Its JFET input stage ensures minimal loading of high-impedance sources, while the high slew rate and gain bandwidth product make it suitable for high-frequency applications. The device maintains stability even with capacitive loads, thanks to its robust internal compensation.

Package Information

The LF353N is available in multiple package options to suit different assembly and thermal requirements:

• 8-Pin PDIP (Plastic Dual In-Line Package): Industry-standard through-hole mounting.
• 8-Pin SOIC (Small Outline Integrated Circuit): Surface-mount package for compact PCB designs.

Pin Configuration

The pinout for the LF353N is as follows (dual op-amp configuration):

• Pin 1: Output A
• Pin 2: Inverting Input A
• Pin 3: Non-Inverting Input A
• Pin 4: V- (Negative Supply)
• Pin 5: Non-Inverting Input B
• Pin 6: Inverting Input B
• Pin 7: Output B
• Pin 8: V+ (Positive Supply)

Thermal and Mechanical Specifications

• PDIP Package Thermal Resistance (θJA): 100°C/W
• SOIC Package Thermal Resistance (θJA): 160°C/W
• Maximum Junction Temperature: 150°C
• Storage Temperature Range: -65°C to +150°C

Conclusion

The LF353N is a high-performance, dual JFET input operational amplifier that offers a compelling combination of speed, precision, and low power consumption. Its compatibility with legacy designs and robust electrical characteristics make it a preferred choice for engineers working on analog signal processing, audio applications, and instrumentation. With its internally trimmed offset voltage and low noise, the LF353N delivers reliable performance in demanding environments.