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. 151-3348
Mfr. Part No.74HC123PW,118
BrandNexperia
HK$1.13
Each (On a Reel of 2500)
units
HC Monostable Multivibrator 2 -4mA 4mA 26 ns 385 ns @ 15 pF - Surface Mount TSSOP16 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 760-3390
Mfr. Part No.LTC6993IS6-1#TRMPBF
HK$34.01
Each
units
LVCMOS, LVTTL Monostable Multivibrator 1 -16mA 16mA 1 μs 28ns 0.2mA Surface Mount TSOT-23 6 2.9 x 1.75 x 1mm 1mm 2.9mm
RS Stock No. 663-0023
Mfr. Part No.CD74HC123PW
HK$4.151
Each (In a Pack of 10)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 320 ns @ 2 V 0.008mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
RS Stock No. 145-0702
Mfr. Part No.CD74HCT123M
HK$4.738
Each (In a Tube of 40)
units
HCT Monostable Multivibrator 2 -4mA 4mA 20 ns 68 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. 541-9308
Mfr. Part No.TC74HC423AF(F)
BrandToshiba
HK$10.804
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 13 ns 210 ns @ 2 V 0.004mA Surface Mount SOP 16 10.3 x 5.3 x 1.5mm 1.5mm 10.3mm
RS Stock No. 145-1086
Mfr. Part No.CD74HC123E
HK$4.45
Each (In a Tube of 25)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 320 ns @ 2 V 0.008mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 162-4277
Mfr. Part No.SN74221N
HK$44.07
Each (In a Tube of 25)
units
74 Monostable Multivibrator 2 -0.8mA 16mA 20 ns 80 ns @ 5 V 26mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 541-9358
Mfr. Part No.TC74HC4538AF(F)
BrandToshiba
HK$6.712
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 13 ns 250 ns @ 2 V 0.004mA Surface Mount SOP 16 10.3 x 5.3 x 1.5mm 1.5mm 10.3mm
RS Stock No. 171-3459
Mfr. Part No.74VHC221AFT
BrandToshiba
HK$2.27
Each (In a Pack of 50)
units
74VHC Monostable Multivibrator 27 -8mA 8mA 5 ns 24.5ns 80µA Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm
RS Stock No. 170-8023
Mfr. Part No.HEF4047BT,653
BrandNexperia
HK$1.28
Each (On a Reel of 2500)
units
HEF - 1 -2.4mA 2.4mA 220 ns 320 ns @ 50 pF - Surface Mount SO 14 8.75 x 4 x 1.45mm 1.45mm 8.75mm
RS Stock No. 145-0153
Mfr. Part No.CD74HC4538E
HK$5.408
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. 153-2888
Mfr. Part No.74HC123PW-Q100,118
BrandNexperia
HK$3.19
Each (In a Pack of 25)
units
74HC Monostable Multivibrator 2 -5.2mA 5.2mA 26 ns 385 ns @ 50 pF - Surface Mount TSSOP 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 781-2863
Mfr. Part No.74HCT221D,652
BrandNexperia
HK$6.44
Each (In a Pack of 10)
units
74HCT Monostable Multivibrator 2 -4mA 4mA 30 ns 75ns - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 125-0045
Mfr. Part No.MC74HC4538ADG
HK$4.09
Each (In a Tube of 48)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 10 ns 295 ns @ 50 pF 0.35mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 170-5405
Mfr. Part No.74LVC1G123DP,125
BrandNexperia
HK$4.39
Each (In a Pack of 25)
units
74LVC Monostable Multivibrator 1 -32mA 32mA 2.5 ns 20.3 ns @ 50 pF 20µA Surface Mount TSSOP 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm
RS Stock No. 170-4890
Mfr. Part No.74LVC1G123DP,125
BrandNexperia
HK$1.76
Each (On a Reel of 3000)
units
74LVC Monostable Multivibrator 1 -32mA 32mA 2.5 ns 20.3 ns @ 50 pF 20µA Surface Mount TSSOP 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm
RS Stock No. 756-2915
Mfr. Part No.TC74HC123AF(ELNE,F
BrandToshiba
HK$5.616
Each (In a Pack of 5)
units
74HC Monostable Multivibrator 2 -5.2mA 5.2mA 95 ns@ 2 V 295ns 0.04mA Surface Mount SOP 16 10.8 x 5.3 x 1.5mm 1.5mm 10.8mm
RS Stock No. 145-5799
Mfr. Part No.SN74LS122D
HK$9.75
Each (In a Tube of 50)
units
LS Monostable Multivibrator 1 -0.4mA 8mA 40 ns 56 ns @ 5 V 6mA Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm
RS Stock No. 662-9682
Mfr. Part No.CD4098BM
HK$4.934
Each (In a Pack of 5)
units
4000 Monostable Multivibrator 2 - - 20 ns 500 ns @ 5 V 0.02mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 151-3398
Mfr. Part No.74HC123PW,118
BrandNexperia
HK$2.82
Each (In a Pack of 50)
units
HC Monostable Multivibrator 2 -4mA 4mA 26 ns 385 ns @ 15 pF - Surface Mount TSSOP16 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
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