Timer Circuits | 555 Timers | NE555 | RS
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    Timer Circuits

    Timer circuits are used to control one or more sequences of events within an electronic system. Timer circuits work by changing the circuit from its current state to another in advance following a set parameter.

    Where would I use a timer circuit?

    You can use timer circuits for a wide range of basic timing functions, like turning a light on for a certain amount of time or on and off repeatedly within a set time to create a flashing light or lighting sequence. Timer circuits can also be used to create musical notes of a particular frequency.

    555 timers

    The most widespread type of timer circuit is the 555 timer, which is made up of an eight-pin dual in-line package containing 25 transistors, two diodes and 16 resistors. They can be used as either astable or monostable timers:

    • Monostable: Often called a one-shot timer, a monostable timer stays on for a certain length of time and then turns off. The timing process starts when the timer is switched on.
    • Astable: An astable timer is switched on to provide a constant on/off digital output. The timer can be used make an LED flash, and the rate of flashing is determined by a capacitor in the circuit.

    143 Products showing for Timer Circuits

    Texas Instruments
    Through Hole
    Standard
    PDIP
    1
    8
    -
    4.5 V
    16 V
    0 °C
    +70 °C
    15mA
    200mA
    -200mA
    -
    Texas Instruments
    Through Hole
    Standard
    PDIP
    1
    8
    -
    4.5 V
    18 V
    -55 °C
    +125 °C
    12mA
    200mA
    -200mA
    -
    Texas Instruments
    Through Hole
    Standard
    PDIP
    2
    14
    -
    4.5 V
    16 V
    0 °C
    +70 °C
    30mA
    200mA
    -200mA
    -
    Texas Instruments
    -
    -
    CDIP
    1
    8
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Texas Instruments
    Surface Mount
    Standard
    SOIC
    1
    8
    -
    4.5 V
    16 V
    0 °C
    +70 °C
    15mA
    200mA
    -200mA
    -
    Microchip
    Surface Mount
    Precision, Standard
    SOT-23
    1
    5
    5MHz
    2.7 V
    18 V
    -40 °C
    +85 °C
    -
    20mA
    -20mA
    -
    Texas Instruments
    -
    -
    CDIP
    1
    8
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Texas Instruments
    Surface Mount
    Standard
    SOIC
    1
    8
    -
    4.5 V
    16 V
    0 °C
    +70 °C
    -
    200mA
    -200mA
    -
    Texas Instruments
    Through Hole
    Programmable
    PDIP
    1
    14
    0.1MHz
    3 V
    18 V
    -55 °C
    +125 °C
    0.1mA
    12.6mA
    -12.6mA
    18000 ns@ 5 V
    Texas Instruments
    Through Hole
    Standard
    PDIP
    1
    8
    2MHz
    1 V
    15 V
    0 °C
    +70 °C
    -
    100mA
    -10mA
    -
    Texas Instruments
    Surface Mount, Through Hole
    Astable, RC Monostable
    SOIC
    2
    14
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Microchip
    Surface Mount
    Precision, Standard
    SOT-23
    1
    5
    5MHz
    2.7 V
    18 V
    -40 °C
    +85 °C
    -
    20mA
    -20mA
    -
    DiodesZetex
    Surface Mount
    Precision
    SOIC
    1
    8
    -
    4.5 V
    16 V
    0 °C
    +70 °C
    -
    200mA
    -200mA
    -
    Microchip
    Surface Mount
    Precision, Standard
    SOT-23
    1
    5
    5MHz
    2.7 V
    18 V
    -40 °C
    +85 °C
    -
    20mA
    -20mA
    -
    Texas Instruments
    Surface Mount
    Standard
    SOIC
    1
    8
    2MHz
    2 V
    15 V
    0 °C
    +70 °C
    -
    100mA
    -10mA
    -
    Texas Instruments
    Through Hole
    Standard
    PDIP
    1
    8
    -
    4.5 V
    18 V
    -55 °C
    +125 °C
    12mA
    200mA
    -200mA
    -
    onsemi
    Surface Mount
    Standard
    SOIC
    1
    8
    -
    4.5 V
    16 V
    -40 °C
    +85 °C
    15mA
    -
    200mA
    -
    Texas Instruments
    Through Hole
    Standard
    PDIP
    1
    8
    2MHz
    1 V
    15 V
    0 °C
    +70 °C
    -
    100mA
    -10mA
    -
    Renesas Electronics
    Surface Mount
    Standard
    SOIC
    1
    8
    1MHz
    2 V
    18 V
    -25 °C
    +85 °C
    -
    20mA
    -0.8mA
    -
    Texas Instruments
    Surface Mount
    Standard
    SOIC
    1
    8
    2MHz
    3 V
    15 V
    -40 °C
    +85 °C
    -
    100mA
    -10mA
    -
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