LF356N/NOPB

Overview

The LF356N/NOPB is a single monolithic JFET input precision operational amplifier from Texas Instruments. It integrates well-matched high-voltage JFETs with standard bipolar transistors using BI-FET II technology. Key electrical parameters include a gain-bandwidth product of 5 MHz, a slew rate of 12 V/µs, and an input bias current of 30 pA. The device operates on supply voltages ranging from 10 V to 36 V (±5 V to ±18 V). It features low input offset voltage drift of 5 µV/K, input noise voltage density of 15 nV/√Hz, and common-mode rejection ratio of 80 dB. The component is housed in an 8-pin PDIP package.

Feature Summary

• Combines matched high-voltage JFETs with standard bipolar transistors for low input bias and offset currents.
• Designed for high slew rate, wide bandwidth, and fast settling time applications.
• Capable of driving large capacitive loads without stability issues due to new output stage design.
• Robust JFET input structure allows for safe handling compared to MOSFET input devices.

Applications

• Signal processing circuits
• Low-noise applications with high or low source impedance
• Replacing expensive hybrid and module FET operational amplifiers

Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free and halogen-free compliance as per Texas Instruments standards. Confirm the package type is PDIP-8 for through-hole mounting. Ensure the operating temperature range matches the application requirements, typically 0°C to +70°C for this variant. Cross-reference the manufacturer part number with official TI documentation to avoid counterfeit components.

Selection Notes

Select the LF356N/NOPB when high speed and low noise are required alongside JFET input characteristics. It serves as a direct replacement for older National Semiconductor LF356 variants. Consider the 5 MHz bandwidth and 12 V/µs slew rate for signal conditioning tasks. Evaluate the 30 pA input bias current suitability for high-impedance sensor interfaces.

Part Context

The LF356 series belongs to Texas Instruments' family of JFET input operational amplifiers. These devices utilize BI-FET II technology to combine the advantages of JFET inputs with bipolar output stages. The LF356N/NOPB specifically denotes the lead-free version of the standard LF356 single-channel amplifier. It is widely used in industrial and commercial electronics requiring precision analog signal processing.

Replacement Considerations

Public confirmed substitute part numbers include LF356M/NOPB for surface mount applications. Other compatible variants within the same family may offer different temperature ranges or packaging options. Verify pin compatibility and electrical specifications before substituting.