NE555 Datasheet – Precision Timer IC

NE555 is mainly used as a timing circuit, for example, it can control delay, period, time delay and frequency division, etc. This IC is used in a variety of applications including signal generation, timing, and digital signal processing.

Part number : NE555, NE555P, NE555PS, NE555PW

Function : Precision Timer

Package :  DIP 8, SOP 8 Pin Type

Manufacturer : Texas Instruments, Philips Semiconductor

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NE555 Precision Timer

Description

The NE555 monolithic timing circuit is a highly stable controller capable of producing accurate time delays, or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200 mA.

Pinout ( Pin diagram )

NE555 datasheet pinout

1. GND (Ground): A ground pin for the flow of charge.

2. TRIG (Trigger): This is a pin that receives the input signal used to start the timer operation.

3. OUT (Output): This is the pin that generates the output signal of the timer.

4. RESET: This pin receives the input signal used to initialize the timer.

5. CTRL (Control Voltage): This is a pin that controls timing using an external voltage.

6. TH (Threshold): This is a pin that sets the threshold to stop the timer operation.

7. DIS (Discharge): This pin discharges the external capacitor.

8. VCC (Power): This pin supplies power to the IC.

 

Features

1. Turn-off time less than 2 µs

2 Max. operating frequency greater than 500 kHz

3. Timing from microseconds to hours

4. Operates in both astable and monostable modes

5. High output current

6. Adjustable duty cycle

7. TTL compatible

8. Temperature stability of 0.005% per °C

 

Simplified Schemetic

NE555 Schematic

Applications

1. Precision timing

2. Pulse generation

3. Sequential timing

4. Time delay generation

5. Pulse width modulation

 

Frequently Asked Questions?

 

Q1. What is the operating voltage range of NE555?

A1. This IC has a typical operating voltage range from 4.5V to 16V. all.

 

Q2. Are there any other timer ICs similar to NE555?

A2. This IC is an old IC, and recently, more advanced timer ICs include LM555, TLC555, etc.

 

Reference sites

1. https://www.ti.com/product/NE555

2. https://en.wikipedia.org/wiki/555_timer_IC

 

NE555 Datasheet

 

 

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2N3055 Transistor – NPN Type

Part number : 2N3055, 2N3055G

Function : Complementary Silicon Power NPN Transistor

Package information : TO-204AA (TO-3) Type

Manufacturer : ON Semiconductor, MOSPEC, STMicroelectronics

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2N3055 NPN Power Transistor

Description

2N3055 is an NPN industrial power transistor. These transistors are used in high-power applications, primarily for power amplification, switching, and circuit control. Transistors suitable for high-power applications, typically capable of handling currents up to 15A and voltages up to 60V. This allows it to be used in a variety of power amplification and switching circuits. Mainly used in low frequency applications. High-power applications often feature relatively slow switching speeds, with optimal performance at low frequencies.

The PNP Bipolar Power Transistor is designed for use in high power amplifier and switching amplifier applications. The 2N3055 (NPN) and MJ2955 (PNP)are complementary devices. Complementary silicon power transistors are designed for general−purpose switching and amplifier applications.

Pinout

2N3055 pinout datasheet

Features

1. DC Current Gain – hFE = 20-70 @ IC = 4 Adc

2. Collector-Emitter Saturation Voltage – VCE(sat) = 1.1 Vdc (Max) @ IC = 4 Adc

3. Excellent Safe Operating Area

4. Pb-Free Packages are Available

 

Absolute maximum ratings ( Ta=25°C )

1. Collector-Emitter Voltage : VCEO = 60 V

2. Collector-Emitter Voltage : VCER = 70 V

3. Collector-Base Voltage : VCB = 100 V

4. Emitter-Base Voltage : VEB = 7 V

5. Collector Current-Continuous : IC = 15 A

6. Base Current : IB = 7 A

 

Reference Site

1. https://en.wikipedia.org/wiki/2N3055

2N3055 Datasheet PDF

 

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