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. 170-8064
Mfr. Part No.74HCT123D,652
BrandNexperia
HK$3.368
Each (In a Tube of 50)
units
74HCT Monostable Multivibrator 2 -4mA 4mA 30 ns 77 ns @ 50 pF - Surface Mount SO 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 151-3419
Mfr. Part No.74HC4538PW,118
BrandNexperia
HK$3.07
Each (In a Pack of 25)
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. 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. 483-7979
Mfr. Part No.HEF4528BT,652
BrandNexperia
HK$4.851
Each (In a Pack of 10)
units
4000 Monostable Multivibrator 2 - - 20 ns 305 ns@ 5 V 0.08mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 178-6975
Mfr. Part No.74HC423D,652
BrandNexperia
HK$5.047
Each (In a Tube of 50)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 255 ns @ 2 V 0.008mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 103-8390
Mfr. Part No.HEF4047BT,652
BrandNexperia
HK$3.91
Each (In a Tube of 57)
units
4000 Monostable Multivibrator 1 - - 70 ns 320 ns @ 5 V 0.08mA Surface Mount SOIC 14 8.75 x 4 x 1.45mm 1.45mm 8.75mm
RS Stock No. 653-2244
Mfr. Part No.BAS70-06W,115
BrandNexperia
HK$1.86
Each (In a Pack of 10)
units
- - 2 - - - - - Surface Mount UMT 3 1 x 2.2 x 1.35mm 1mm 2.2mm
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. 153-1982
Mfr. Part No.74HC123PW-Q100,118
BrandNexperia
HK$1.28
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. 483-6588
Mfr. Part No.74HC423D,652
BrandNexperia
HK$5.994
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 255 ns@ 2 V 0.008mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 146-0376
Mfr. Part No.74HCT221D,652
BrandNexperia
HK$6.44
Each (In a Tube of 50)
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. 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. 791-8797
Mfr. Part No.74HCT4538D,112
BrandNexperia
HK$3.886
Each (In a Pack of 20)
units
HCT Monostable Multivibrator 2 -5.2mA 5.2mA 16 ns 90 ns@ 4.5 V 0.008mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
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. 151-3351
Mfr. Part No.74HC4538PW,118
BrandNexperia
HK$1.277
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. 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. 103-8394
Mfr. Part No.HEF4538BT,652
BrandNexperia
HK$3.873
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
RS Stock No. 146-0850
Mfr. Part No.74HCT4538D,112
BrandNexperia
HK$4.831
Each (In a Tube of 50)
units
HCT Monostable Multivibrator 2 -5.2mA 5.2mA 16 ns 90 ns @ 4.5 V 0.008mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
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. 113-0635
Mfr. Part No.74HC4538D,652
BrandNexperia
HK$5.38
Each
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 14 ns 265 ns@ 2 V 0.008mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm