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Timer Circuits

Timer circuits are used to control sequences of events in electronic systems. They work by changing the circuit from one state to another in advance.

Applications for timer circuits
You can use timer circuits for basic timing functions, like turning a light on for a certain amount of time or creating a flashing light. They 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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Part Details Brand Stock 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 Dimensions Length Width Height Series Propagation Delay Test Condition
Nexperia HEF4541BT,512, Programmable Timer Circuit 36MHz, 14-Pin SOIC Nexperia 0 Surface Mount Programmable SOIC 1 14 36MHz 3 V 15 V -40 °C +85 °C - 4.2mA -4.2mA 1150 ns @ 5 V 8.75 x 4 x 1.45mm 8.75mm 4mm 1.45mm - -
ON Semiconductor LM555CM, Timer, 8-Pin SOIC ON Semiconductor 0 Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA - 5 x 4 x 1.5mm 5mm 4mm 1.5mm - -
ON Semiconductor MC14541BDG, Programmable Timer Circuit 3MHz, 14-Pin SOIC ON Semiconductor 0 Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns @ 5 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm - -
Texas Instruments TLC556IDR, Timer Circuit, Dual 2MHz, 14-Pin SOIC Texas Instruments 9455 Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA - 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm - -
Texas Instruments NE556N, Timer Circuit, Dual, 14-Pin PDIP Texas Instruments 7050 Through Hole Standard PDIP 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA - 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm - -
ON Semiconductor LM555CM, Timer, 8-Pin SOIC ON Semiconductor 3960 Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA - 5 x 4 x 1.5mm 5mm 4mm 1.5mm - -
ON Semiconductor MC1455DG, Timer Circuit, 8-Pin SOIC ON Semiconductor 2450 Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA - 5 x 4 x 1.5mm 5mm 4mm 1.5mm - -
Texas Instruments TLC555IDR, Timer Circuit 2MHz, 8-Pin SOIC Texas Instruments 2275 Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA - 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm - -
ON Semiconductor FT3001MPX, Precision Timer, 4, 8-Pin MLP ON Semiconductor 2180 Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns 2 x 2 x 0.75mm 2mm 2mm 0.75mm - 5pF
STMicroelectronics STWD100YNPWY3F, Watchdog Timer, 5-Pin SOT-23 STMicroelectronics 1850 Surface Mount Watchdog SOT-23 1 5 - 2.7 V 5.5 V -40 °C +125 °C - - - - 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm - -
ON Semiconductor MC1455DR2G, Timer Circuit, 8-Pin SOIC ON Semiconductor 1740 Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA - 5 x 4 x 1.5mm 5mm 4mm 1.5mm - -
DiodesZetex NA555S-13, Precision Timer Circuit, 8-Pin SOIC DiodesZetex 1540 Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA - 4.95 X 3.95 X 1.5mm 4.95mm 3.95mm 1.5mm - -
Renesas Electronics ICM7242IPAZ, Timer Circuit 13MHz, 8-Pin PDIP Renesas Electronics 1510 Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - - 10.16 x 8.25 x 4.95mm 10.16mm 8.25mm 4.95mm - -
Texas Instruments LMC555CM/NOPB, Timer Circuit 3MHz, 8-Pin SOIC Texas Instruments 1235 Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns @ 5 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm - -
Texas Instruments TLC555ID, Timer Circuit 2MHz, 8-Pin SOIC Texas Instruments 1200 Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA - 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm - -
Texas Instruments CD4541BEE4, Programmable Timer Circuit 0.1MHz, 14-Pin PDIP Texas Instruments 1075 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 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm - -
ON Semiconductor MC14536BDWR2G, Programmable Timer Circuit 2MHz, 16-Pin SOIC ON Semiconductor 990 Surface Mount Programmable SOIC - 16 2MHz 3 V 18 V -55 °C +125 °C 600µA 2.4mA -0.9mA 14 μs@ 50 pF 10.45 x 7.6 x 2.4mm 10.45mm 7.6mm 2.4mm - 50pF
Texas Instruments CD4536BPWR, Programmable Timer Circuit, 16-Pin TSSOP Texas Instruments 980 Surface Mount Programmable TSSOP 1 16 - 3 V 18 V -55 °C +125 °C 0.1mA 4.2mA -4.2mA 8000 ns@ 5 V 5 x 4.4 x 1.15mm 5mm 4.4mm 1.15mm - -
ON Semiconductor LM555CN, Timer, 8-Pin PDIP ON Semiconductor 900 Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA - 10.15 x 6.35 x 3.15mm 10.15mm 6.35mm 3.15mm - -
Texas Instruments SA555P, Timer Circuit, 8-Pin PDIP Texas Instruments 750 Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA - 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm - -
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