Monostable Multivibrators

Monostable multivibrators, also known as one-shot multivibrators, are a type of electronic circuit that can be used as a timer. They have one stable and one unstable state. The unstable state is caused by a trigger pulse. This state is transient, so the circuit always returns to stability after a fixed time has elapsed. 


Generally, monostable multivibrator circuits are composed of two transistors, coupled with one resistor-capacitor network and one resistor network. These networks are what determines the length of time before the circuit returns to its stable state, after being triggered. 


What are monostable multivibrators used for?

Monostable multivibrators are used to produce a specific timed delay within a circuit. Therefore, they can broadly be used as timers or as pulse detectors in electronic equipment. 


Types of monostable multivibrators

There are two types of monostable multivibrators:

  • Retriggerable monostable multivibrators will remain in the unstable state with repeated application of the trigger pulse.
  • Non-retriggerable monostable multivibrators are unaffected by further trigger pulses, and will remain in the unstable state only for the predetermined period of time. 

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Description Price Logic Family Logic Function Number of Elements per Chip Maximum High Level Output Current Maximum Low Level Output Current Minimum Pulse Width Maximum Propagation Delay Time @ Maximum CL Maximum Quiescent Current Mounting Type Package Type Pin Count Dimensions Height Length
RS Stock No. 145-1238
Mfr. Part No.SN74AHCT123AD
HK$2.006
Each (In a Tube of 40)
units
AHCT Monostable Multivibrator 2 -8mA 8mA 5 ns 11 ns @ 5 V 0.004mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 145-0420
Mfr. Part No.CD4047BM
HK$1.958
Each (In a Tube of 50)
units
4000 Monostable Multivibrator 1 - - 50 ns 1000 ns @ 5 V 0.02mA Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm
RS Stock No. 151-3351
Mfr. Part No.74HC4538PW,118
BrandNexperia
HK$1.62
Each (On a Reel of 2500)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 20 ns 400 ns @ 15 pF - Surface Mount TSSOP16 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 145-1251
Mfr. Part No.SN74LV123APW
HK$2.899
Each (In a Tube of 90)
units
LV Monostable Multivibrator 2 -12mA 12mA 5 ns 36 ns @ 2.5 V 0.02mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
RS Stock No. 162-6981
Mfr. Part No.CD74HCT4538M96
HK$2.241
Each (On a Reel of 2500)
units
HCT Monostable Multivibrator 2 -4mA 4mA 16 ns 55 ns @ 4.5 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 816-4641
Mfr. Part No.74HCT123PW,112
BrandNexperia
HK$2.381
Each (In a Pack of 32)
units
HCT Monostable Multivibrator 1 -4mA 4mA 150 ns 385 ns@ 50 pF - Surface Mount TSSOP 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 145-0153
Mfr. Part No.CD74HC4538EE4
HK$2.525
Each (In a Tube of 25)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 14 ns 250 ns @ 2 V 0.008mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 662-9635
Mfr. Part No.CD4047BM
HK$3.792
Each (In a Pack of 5)
units
4000 Monostable Multivibrator 1 - - 50 ns 1000 ns @ 5 V 0.02mA Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm
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