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.

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รายละเอียดสินค้า / Description ราคา / Price Mounting Type Timer Type Package Type Number of Internal Timers Pin Count Maximum Input Frequency Minimum Operating Supply Voltage Maximum Operating Supply Voltage Minimum Operating Temperature Maximum Operating Temperature Maximum Quiescent Current Maximum Low Level Output Current Maximum High Level Output Current Maximum Propagation Delay Time @ Maximum CL
RS Stock No. 188-9296
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TS556IDTTR
THB39.22
Each
Units
Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF
RS Stock No. 196-2112
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TS555IDTTR
THB30.335
Each: (In a Pack of 10)
Units
Surface Mount Monostable SO 2 8 2.7MHz 2 V 16 V -40 °C +125 °C - 1mA -0.3mA -
RS Stock No. 829-1516
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.STWD100YNPWY3F
THB22.684
Each: (In a Pack of 10)
Units
Surface Mount Watchdog SOT-23 1 5 - 2.7 V 5.5 V -40 °C +125 °C - - - -
RS Stock No. 196-2111
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TS555IDTTR
THB16.081
Each (On a Reel of 2500)
Units
Surface Mount Monostable SO 2 8 2.7MHz 2 V 16 V -40 °C +125 °C - 1mA -0.3mA -
RS Stock No. 188-9229
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TS556IDTTR
THB18.834
Each (On a Reel of 2500)
Units
Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF