on November 4th 104

Exploring the LF356 Op-Amp: Pinout and Package Specifications

The LF356 operational amplifier represents a remarkable blend of high-voltage JFETs and standard bipolar transistors on a single chip, setting it apart in the world of high-performance op-amps. This unique integration leverages the low input bias currents and high input impedance of JFETs with the strength and speed of bipolar transistors, making the LF356 an ideal choice for complex electronic systems requiring precision and responsiveness. Whether used in high-impedance buffering, wideband amplification, or precision instrumentation, the LF356 offers you a versatile and reliable solution. This article explores its packaging, pin configuration, technical specifications, and key applications, showcasing why the LF356 is a preferred tool in advanced electronic design.

Catalog

Overview of the LF356

The LF356 represents a noteworthy evolution in the world of monolithic JFET input operational amplifier technology. By integrating high-voltage JFETs with conventional bipolar transistors through BI-FET™ Technology, it achieves remarkable performance traits. For example, it maintains an impressively low input bias and offset current, alongside reduced offset voltage and drift. Its offset adjustment feature allows for stable drift and common-mode rejection ratios. It also boasts a high slew rate, expansive bandwidth, and swift settling time. Additionally, the design significantly diminishes noise levels and showcases a low 1/f noise corner.

The LF356's architecture emphasizes fine-tuning various factors in operational amplifiers. Utilizing matched high-voltage JFETs with standard bipolar transistors via BI-FET™ Technology, the device excels in delivering superior input characteristics. Among these are exceptionally low input bias and offset currents, instrumental for accuracy in exacting applications. The minimal offset voltage and drift, beneficial for sustained stability, work in tandem with adjustable offset capabilities, enabling the device to uphold its drift and common-mode rejection performance across diverse operational contexts.

From practical experience, devices like the LF356 are known to thrive in scenarios where precision and stability are deeply valued. Its high slew rate and vast bandwidth are mostly advantageous for high-speed analog computing and signal processing, making it a preferred choice in such areas. Laboratories frequently depend on these amplifiers for exact and dependable outcomes. Moreover, the rapid settling time is especially advantageous in data acquisition systems, where prompt response and precision hold great significance. The reduced voltage/current noise and low 1/f noise corner further enhance its fit for high-fidelity audio and instrumentation applications, where safeguarding signal purity is highly valued.

LF356 Pin Configuration

PIN NAME	PIN NO.	I/O	DESCRIPTION
BALANCE	1, 5	I	Balance for input offset voltage
+INPUT	3	I	Noninverting input
–INPUT	2	I	Inverting input
NC	8	—	No connection
OUTPUT	6	O	Output
V+	7	—	Positive power supply
V–	4	—	Negative power supply

LF356 CAD Model Analysis

Electrical Symbol

PCB Footprint

Three-Dimensional Model

Features

Feature	Description
Hybrid & Module Replacement	Replaces expensive hybrid and module FET op amps
JFET Durability	Uses rugged JFETs for blow-out-free handling compared to MOSFET input devices
Low Noise Performance	Excellent for low noise applications with both high and low source impedance; very low 1/f corner
Offset Adjustment Stability	Offset adjustment does not degrade drift or common-mode rejection as seen in most monolithic amplifiers
Large Capacitive Load Handling	New output stage supports large capacitive loads (up to 5,000 pF) without stability issues
Internal Compensation & High Differential Input Capability	Provides internal compensation and supports large differential input voltage

Technical Specifications

Here is the table format for the technical specifications and attributes of the Texas Instruments LF356N.

Type	Parameter
Mount	Through Hole
Mounting Type	Through Hole
Package / Case	8-DIP (0.300, 7.62mm)
Number of Pins	8
Operating Temperature	0°C ~ 70°C
Packaging	Tube
Series	BI-FET™
JESD-609 Code	e0
Pbfree Code	No
Part Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	8
ECCN Code	EAR99
Terminal Finish	Tin/Lead (Sn/Pb)
Packing Method	RAIL
Max Power Dissipation	670mW
Terminal Position	DUAL
Number of Functions	1
Supply Voltage	15V
Terminal Pitch	2.54mm
Base Part Number	LF356
Pin Count	8
Operating Supply Voltage	15V
Number of Channels	1
Operating Supply Current	5mA
Nominal Supply Current	5mA
Power Dissipation	670mW
Output Current	25mA
Max Supply Current	10mA
Slew Rate	12V/μs
Architecture	VOLTAGE-FEEDBACK
Amplifier Type	J-FET
Common Mode Rejection Ratio	80 dB
Current - Input Bias	30pA
Voltage - Supply, Single/Dual (±)	±15V
Input Offset Voltage (Vos)	10mV
Neg Supply Voltage-Nom (Vsup)	-15V
Unity Gain BW-Nom	5000 kHz
Voltage Gain	106.02dB
Average Bias Current-Max (IIB)	0.0002μA
Power Supply Rejection Ratio (PSRR)	80dB
Low-Offset	No
Frequency Compensation	Yes
Voltage - Input Offset	3mV
Low-Bias	Yes
Bias Current-Max (IIB) @25C	0.0002μA
Input Offset Current-Max (IIO)	0.002μA
Height	3.3mm
Length	9.27mm
Width	6.35mm
REACH SVHC	No SVHC
Radiation Hardening	No
RoHS Status	Non-RoHS Compliant
Lead Free	Contains Lead

Functional Block Diagram

Modern Applications of the LF356

The LF356 operational amplifier flourishes in a domain that demands both acute precision and rapid responsiveness. Its utility as a component in high-speed integrators is notable, as it adeptly processes swift signal changes with minimal delay. In the sphere of D/A and A/D converters, the LF356 adeptly manages digital-to-analog and analog-to-digital transformations, playing a prominent role in digital signal processing frameworks and communication systems.

High Impedance Buffers

In scenarios demanding high impedance buffering, the LF356 upholds signal integrity across multiple transmission contexts. Used in sensor interfacing or driver stages, the LF356 provides stable buffers, enhancing overall system performance.

Wideband Amplifiers

The LF356's reach extends to wideband amplifier applications, where its extensive frequency response range is highly valued. In radio frequency communications and broadcast equipment, the LF356 ensures robust signal amplification, maintaining both speed and quality, showcasing meticulous engineering throughout.

Low Noise and Drift Applications

In pursuits where minimal noise interference and drift are key, such as sensitive audio equipment or exacting measurement tools, the LF356 shines. Its low noise contributions are mostly requisite in environments where even trivial levels of interference could be disruptive, embodying the continuous effort to further refine engineering.

Specialized Logarithmic and Photocell Amplifiers

Logarithmic and photocell amplifier configurations benefit greatly from the LF356’s stability and responsiveness to varying light levels or exponential tasks. Applications in optical sensing and sophisticated computational work illustrate how the LF356 provides a dependable performance baseline, fostering innovations in light-sensitive technology.

Efficient Sample and Hold Circuits

In sample and hold circuits, the LF356 excels, skillfully capturing and maintaining precise signal values. This role is major in digital systems where the timing and accuracy of data are of notable importance. Practical uses include various instruments and digital modulation systems that rely on the fidelity of a momentary signal snapshot to maintain process integrity.

Package

Manufacturer

Texas Instruments (TI) traces its esteemed legacy in semiconductor technology back to 1958 when it pioneered the creation of the first working integrated circuit. Today, with a workforce exceeding 30,000 worldwide, TI remains a leader in pushing the boundaries of innovation, especially in the promising areas of analog and embedded processing sectors. The company's dedication to solving challenges through collaboration is a driving force propelling technological advancements on a global scale.