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. 663-0385
Mfr. Part No.CD74HC4538EE4
HK$6.546
Each (In a Pack of 5)
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. 662-7008
Mfr. Part No.CD74HC123PWR
HK$3.17
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. 540-7692
Mfr. Part No.TC74HC123AF(F)
BrandToshiba
HK$5.50
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. 168-9651
Mfr. Part No.BAS70-06W,115
BrandNexperia
HK$0.249
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 662-7226
Mfr. Part No.CD74HCT123M96
HK$3.163
Each (In a Pack of 10)
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. 145-0202
Mfr. Part No.CD74HC221EE4
HK$2.717
Each (In a Tube of 25)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 12 ns 210 ns @ 2 V 0.008mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 921-2808
Mfr. Part No.SN74LVC1G123DCTR
HK$2.816
Each (On a Reel of 3000)
units
LVC Monostable Multivibrator 1 -32mA 32mA 2.5 ns - 20µA Surface Mount SM 8 3.15 x 2.9 x 1.2mm 1.2mm 3.15mm
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. 171-3330
Mfr. Part No.74VHC221AFT
BrandToshiba
HK$0.796
Each (On a Reel of 2500)
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. 781-2863
Mfr. Part No.74HCT221D,652
BrandNexperia
HK$5.647
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. 306-471
Mfr. Part No.SN74123N
HK$43.76
Each
units
74 Monostable Multivibrator 2 -0.8mA 16mA 40 ns 40 ns @ 5 V 46mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 162-6980
Mfr. Part No.CD74HCT423M96
HK$2.067
Each (On a Reel of 2500)
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. 662-7358
Mfr. Part No.CD74HCT423M96
HK$4.944
Each (In a Pack of 5)
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. 145-1086
Mfr. Part No.CD74HC123EE4
HK$2.22
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. 171-3314
Mfr. Part No.74VHC123AFT
BrandToshiba
HK$0.844
Each (On a Reel of 2500)
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. 527-895
Mfr. Part No.CD4047BE
HK$3.644
Each (In a Tube of 25)
units
4000 Monostable Multivibrator 1 - - 50 ns 1000 ns @ 5 V 0.02mA Through Hole PDIP 14 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
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. 153-1982
Mfr. Part No.74HC123PW-Q100,118
BrandNexperia
HK$1.215
Each (On a Reel of 2500)
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. 103-8394
Mfr. Part No.HEF4538BT,652
BrandNexperia
HK$2.786
Each (In a Tube of 50)
units
4000 Monostable Multivibrator 2 - - 20 ns 460 ns @ 5 V 0.08mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
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