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 485-8904
製造零件編號HEF4541BT,512
BrandNexperia
HK$4.728
/個 (每包:10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
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 921-5951
製造零件編號ICM7242IPAZ
HK$48.00
/個 (每包:2個)
單位
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS庫存編號 190-5920
製造零件編號MAX7375AXR805+T
HK$12.88
/個 (每包:5個)
單位
Surface Mount - SC-70 - 3 9.99MHz 2.7 V 5.5 V -40 °C +125 °C - - - -
RS庫存編號 517-1618
製造零件編號SA555P
HK$3.296
/個 (每包:10個)
單位
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
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 732-1313
製造零件編號SE556J
HK$151.49
單位
Through Hole Standard CDIP 2 14 - 4.5 V 18 V -55 °C +125 °C 24mA 200mA -200mA -
RS庫存編號 190-5908
製造零件編號DS1100LZ-20+
HK$57.115
/個 (每包:2個)
單位
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS庫存編號 165-4290
製造零件編號MIC1555YM5-TR
BrandMicrochip
HK$5.577
個 (在毎卷:3000)
單位
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS庫存編號 190-4882
製造零件編號DS1100LZ-200+
HK$39.889
毎管:100 個
單位
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS庫存編號 772-9310
製造零件編號FT3001MPX
HK$5.18
/個 (每包:10個)
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 921-0745
製造零件編號NA555S-13
HK$3.32
/個 (每包:30個)
單位
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA -
RS庫存編號 121-8520
製造零件編號TLC555IP
HK$5.19
毎管:50 個
單位
- - - - - - - - - - - - - -
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 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 121-9741
製造零件編號TPL5000DGST
HK$10.44
個 (在毎卷:250)
單位
Surface Mount Programmable VSSOP 1 10 - 1.8 V 5 V -40 °C +105 °C - - - -
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 662-3993
製造零件編號NE556DR
HK$2.853
/個 (每包:10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 162-7093
製造零件編號TLC555QDR
HK$4.281
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 2MHz 5 V 15 V -40 °C +125 °C - 100mA -10mA -
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 - - - - - - - - -