LF353 Pinout – Dual JFET Input Operational Amplifier

LF353 is a low-noise, low-input bipolar voltage amplifier (BiFET Operational Amplifier). This is a high-performance au pairing amplifier used in high-performance audio, signal processing, and amplification applications.

Part number : LF353

Functions : Wide Bandwidth Dual JFET Input Operational Amplifier

Package information : DIP 8 Pin type

Manufacturer : Fairchild, National Semiconductor

Image :

LF353 datasheet


The LF353 is a JFET input operational amplifier with aninternally compensated input offset voltage. The JFET inputdevice provides wide bandwidth, low input bias currents andoffset currents.

This device is low cost, high speed, dual JFET inputoperational amplifiers with an internally trimmed input offsetvoltage (BI-FET II™technology). They require low supplycurrent yet maintain a large gain bandwidth product and fastslew rate. In addition, well matched high voltage JFET inputdevices provide very low input bias and offset currents.

This circuit is high speed JFET input dual operational amplifiers incorporating well matched, high voltage JFET and bipolar transistors in a monolithic integrated circuit.The devices feature high slew rates, low input bias and offset currents, and low offset voltage temperature coefficient.

LF353 has high input impedance and low input bipolar characteristics, making it suitable for circuits for accurate signal amplification and processing. These amplifiers’ low noise characteristics and wide bandwidth make them particularly useful in audio and signal processing applications.



LF353 pinout


• Internally trimmed offset voltage: 10mV

• Low input bias current: 50pA

• Wide gain bandwidth: 4MHz

• High slew rate: 13V/μs

• High Input impedance: 1012Ω


LF353 PDF File

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iN4148 Diode – 100V, 200mA, Small Signal

iN4148 is a silicon diode for high-speed switching. This diode is used in a variety of electronic circuits, primarily for signal grooming, current direction control, and protection functions.

Correct Part number : 1N4148

Functions : This is a kind of rectifier, 100V, 200mA, Small Signal Diode.

Package information : DO-204AH ( DO-35 )

Manufacturer : Fairchild, On Semiconductor, Renesas, Rohm, Vishay, Rectron

Image :

iN4148 diode

The texts in the PDF file :

1. Silicon epitaxial planar diode

2. Fast swithching diodes

3. 500mW power dissipation

4. The diode is also available in the Mini-Melf case with the type


The iN4148 diode has a reverse insurance function that passes small signals in the forward direction and blocks them in the reverse direction. This diode feature fast switching speeds and low reverse recovery times, making them particularly useful in high-frequency signal processing.

1. Purpose: The 1N4148 diode is primarily used for switching applications, such as in digital logic circuits, where it allows current to flow in one direction while blocking it in the opposite direction.

2. Construction: The diode is constructed using semiconductor materials, typically silicon, with a p-n junction. It has two terminals: the anode (positive terminal) and the cathode (negative terminal). The diode’s physical structure consists of a small chip or die connected to metal leads, encapsulated in a glass or plastic package.

3. Forward Voltage Drop: The 1N4148 diode has a low forward voltage drop, typically around 0.6 to 0.7 volts when conducting current in the forward direction.

4. Reverse Breakdown Voltage: It has a reverse breakdown voltage of approximately 75 volts, which means it can withstand up to 75 volts in the reverse direction before breakdown occurs.

5. Maximum Current Rating: The diode has a maximum continuous forward current rating of 200 mA (milliamperes) and a peak forward surge current rating of 2 A (amperes) for short durations.

6. Switching Speed: One of the key advantages of the 1N4148 diode is its fast switching speed. It can quickly transition from the off state to the on state and vice versa, making it suitable for high-frequency applications.

7. Small Signal Diode: The 1N4148 is classified as a small-signal diode, which means it is optimized for low-power and signal-level applications rather than high-power or rectification purposes.


Mechanical Data

1. Case: Glass sealed case

2. Lead: MIL-STD-202E, Method 208 guaranteed

3. Polarity: Color band denotes cathode end

4. Mounting position: Any

5. Weight: 0.13 gram


Absolute maximum ratings

1. Reverse voltage : VR = 75 Volts

2. Peak reverse voltage : VRM = 100 Volts

3. Average rectified current, Half wave rectification : IAV 150 mA

4. Surge forward current at t<1S and TJ=25 : IFSM 500 mA

5. Power dissipation at TA=25 : Ptot = 500 mW


iN4148 Diode PDF File

iN4148 Diode

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1N4148 datasheet

External link : 1N4148 Datasheet search site