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 823-4043
製造零件編號NE555S-13
HK$2.441
/個 (每包:50個)
單位
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 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 -
RS庫存編號 740-5588
製造零件編號NJM555V-TE1
HK$6.696
/個 (每包:5個)
單位
Surface Mount Standard SSOP 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
RS庫存編號 190-4884
製造零件編號ICM7240IPE+
HK$48.753
毎管:25 個
單位
Through Hole - PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
全新
RS庫存編號 196-2112
製造零件編號TS555IDTTR
HK$8.575
/個 (每包:10個)
單位
Surface Mount Monostable SO 2 8 2.7MHz 2 V 16 V -40 °C +125 °C - 1mA -0.3mA -
全新
RS庫存編號 196-8889
製造零件編號ICM7555IBAZ-T
HK$2.366
個 (在毎卷:2500)
單位
- Standard SOIC - 8 1MHz - - - - - - - -
RS庫存編號 188-9229
製造零件編號TS556IDTTR
HK$4.45
個 (在毎卷:2500)
單位
Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF
RS庫存編號 761-6104
製造零件編號LMC555CMM/NOPB
HK$8.848
/個 (每包:5個)
單位
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
RS庫存編號 145-0368
製造零件編號SE555D
HK$3.481
毎管:75 個
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS庫存編號 662-4699
製造零件編號TLC556MD
HK$18.06
/個 (每包:5個)
單位
Surface Mount Standard SOIC 2 14 2MHz 5 V 18 V -55 °C +125 °C - 100mA -10mA -
全新
RS庫存編號 197-7308
製造零件編號LM555CN/NOPB
HK$8.494
/個 (每包:10個)
單位
- - PDIP - 8 - - - - - - - - -
RS庫存編號 145-7365
製造零件編號TLC556MD
HK$15.32
毎管:50 個
單位
Surface Mount Standard SOIC 2 14 2MHz 5 V 18 V -55 °C +125 °C - 100mA -10mA -
RS庫存編號 921-5541
製造零件編號IS82C54Z
HK$165.41
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 662-4003
製造零件編號TLC556CDR
HK$10.87
/個 (每包:5個)
單位
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
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 -
RS庫存編號 922-2158
製造零件編號LMC555CMM/NOPB
HK$7.245
個 (在毎卷:1000)
單位
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
全新
RS庫存編號 196-8887
製造零件編號ICM7555CBAZ-T
HK$2.366
個 (在毎卷:2500)
單位
- Standard SOIC - 8 1MHz - - - - - - - -
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 858-0891
製造零件編號LTC6993CS6-4#TRMPBF
HK$30.756
/個 (每包:5個)
單位
Surface Mount Monostable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 28 ns@ 5 pF
RS庫存編號 145-4759
製造零件編號MC1455BDR2G
HK$1.55
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -