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 178-4795
製造零件編號MC14541BDG
HK$2.64
毎管:55 個
單位
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
RS庫存編號 518-9518
製造零件編號MC14541BDG
HK$12.17
單位
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
RS庫存編號 688-1543
製造零件編號MC14541BDR2G
HK$3.292
/個 (每包:5個)
單位
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
RS庫存編號 806-2832
製造零件編號LM555CM
HK$2.083
毎管:90 個
單位
Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS庫存編號 178-4703
製造零件編號LM555CM
HK$2.348
毎管:100 個
單位
Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS庫存編號 806-2835
製造零件編號LM555CN
HK$2.294
毎管:50 個
單位
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS庫存編號 169-8718
製造零件編號LM555CN
HK$1.221
個 (在毎卷:3000)
單位
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS庫存編號 166-3397
製造零件編號FT7511L6X
HK$2.495
個 (在毎卷:5000)
單位
Surface Mount Reset MicroPak 1 6 - 1.8 V 5 V -40 °C +85 °C 1µA 50mA -50mA -
RS庫存編號 772-9310
製造零件編號FT3001MPX
HK$2.796
/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 145-4759
製造零件編號MC1455BDR2G
HK$1.511
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS庫存編號 166-2846
製造零件編號FT3001MPX
HK$3.041
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 166-3556
製造零件編號FT7521L6X
HK$2.339
個 (在毎卷:5000)
單位
Surface Mount Reset MicroPak 1 6 - 1.8 V 1.8 → 5 V -40 °C +85 °C 1µA 3mA - 9 s @ 5 pF
RS庫存編號 166-3192
製造零件編號FT7522L6X
HK$1.887
個 (在毎卷:5000)
單位
Surface Mount Reset MicroPak 1 6 - 1.8 V 5 V -40 °C +85 °C 1µA 50mA -50µA 9ns
RS庫存編號 162-9390
製造零件編號MC1455DR2G
HK$1.469
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS庫存編號 787-8709
製造零件編號MC1455BDR2G
HK$3.073
/個 (每包:10個)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS庫存編號 862-9202
製造零件編號FT10001L6X
HK$4.271
/個 (每包:10個)
單位
Surface Mount Reset MicroPak 1 6 - 1.8 V 5 V -40 °C +85 °C 1µA 50mA -50mA -
RS庫存編號 807-6109
製造零件編號FT7521L6X
HK$3.958
/個 (每包:10個)
單位
Surface Mount Reset MicroPak 1 6 - 1.8 V 1.8 → 5 V -40 °C +85 °C 1µA 3mA - 9 s@ 5 pF
RS庫存編號 862-9211
製造零件編號FT7511L6X
HK$3.819
/個 (每包:25個)
單位
Surface Mount Reset MicroPak 1 6 - 1.8 V 5 V -40 °C +85 °C 1µA 50mA -50mA -
RS庫存編號 166-3544
製造零件編號FT8010UMX
HK$3.119
個 (在毎卷:5000)
單位
Surface Mount Reset UMLP 1 10 - 1.8 V 5 V -40 °C +85 °C 20µA 50mA -50mA 310ns
RS庫存編號 787-8706
製造零件編號MC1455DR2G
HK$2.635
/個 (每包:20個)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -