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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Description 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庫存編號 103-9932
製造零件編號ICM7555IPA+
HK$25.997
毎管:50 個
單位
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
RS庫存編號 190-5926
製造零件編號ICM7242IPA+
HK$43.888
/個 (每包:5個)
單位
Through Hole - PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
全新
RS庫存編號 197-7307
製造零件編號LM555CN/NOPB
HK$8.402
毎管:40 個
單位
- - PDIP - 8 - - - - - - - - -
RS庫存編號 191-4247
製造零件編號ICM7556IPD+
HK$35.485
毎管:25 個
單位
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS庫存編號 166-2846
製造零件編號FT3001MPX
HK$2.215
個 (在毎卷:3000)
單位
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
RS庫存編號 809-6393
製造零件編號NA555DR
HK$2.338
/個 (每包:20個)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C 15mA 200mA -200mA 300 ns@ 15 pF
RS庫存編號 787-779
製造零件編號TLC556CD
HK$13.09
單位
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 662-4006
製造零件編號TLC555CDR
HK$5.15
/個 (每包:10個)
單位
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 921-5677
製造零件編號IS82C54-10Z
HK$205.84
單位
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS庫存編號 178-7003
製造零件編號HEF4541BT,512
BrandNexperia
HK$4.511
毎管:57 個
單位
Surface Mount Programmable SOIC 1 14 36MHz 3 V 15 V -40 °C +85 °C - 4.2mA -4.2mA 1150 ns @ 5 V
RS庫存編號 923-1405
製造零件編號IS82C54Z
HK$145.73
毎管:37 個
單位
Surface Mount Programmable PLCC 1 28 8MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 150 ns @ 5 V
RS庫存編號 162-8608
製造零件編號LMC555IM/NOPB
HK$11.21
毎管:95 個
單位
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
全新
RS庫存編號 196-8888
製造零件編號ICM7555CBAZ-T
HK$5.485
/個 (每包:25個)
單位
- Standard SOIC - 8 1MHz - - - - - - - -
RS庫存編號 112-5368
製造零件編號NE556D
HK$4.62
單位
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
全新
RS庫存編號 197-7393
製造零件編號NE555DR
HK$2.207
/個 (每包:50個)
單位
- - SOIC - 8 - - - - - - - - -
RS庫存編號 165-8649
製造零件編號SA555S-13
HK$1.08
個 (在毎卷:2500)
單位
Surface Mount Precision, Reset SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
RS庫存編號 920-0177
製造零件編號LTC6994IS6-1#TRMPBF
HK$21.542
個 (在毎卷:500)
單位
Surface Mount Programmable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 24 ns @ 5 pF
RS庫存編號 162-7024
製造零件編號SA556N
HK$4.007
毎管:25 個
單位
Through Hole Standard PDIP 2 14 - 4.5 V 16 V -40 °C +85 °C 30mA 200mA -200mA -
RS庫存編號 145-0833
製造零件編號NE556D
HK$3.852
毎管:50 個
單位
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS庫存編號 190-4879
製造零件編號DS1023S-200+
HK$118.436
毎管:46 個
單位
Surface Mount Programmable SOIC 1 16 10MHz 4.75 V 5.25 V 0 °C +70 °C - 8 (Minimum)mA -1mA -