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. 151-3398
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
RS Stock No. 184-4260
Mfr. Part No.MC14538BDWG
HK$5.34
Each (In a Tube of 47)
units
4000 Monostable Multivibrator 2 -4.2 (Minimum)mA 4.2 (Minimum)mA 5 ns 600 ns @ 50 pF 600µA Surface Mount SOIC 16 10.45 x 7.6 x 2.4mm 2.4mm 10.45mm
RS Stock No. 124-2262
Mfr. Part No.74HC4538D,652
BrandNexperia
HK$4.11
Each (In a Tube of 50)
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
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. 178-9175
Mfr. Part No.CD74HC221M
HK$6.319
Each (In a Tube of 40)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 12 ns 210 ns @ 2 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 306-471
Mfr. Part No.SN74123N
HK$46.89
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. 662-7226
Mfr. Part No.CD74HCT123M96
HK$2.853
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. 663-0161
Mfr. Part No.CD74HC221M
HK$6.59
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 12 ns 210 ns @ 2 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 178-9183
Mfr. Part No.CD74HC423M
HK$6.074
Each (In a Tube of 40)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 320 ns @ 2 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
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. 540-0427
Mfr. Part No.TC74HC4538AP(F)
BrandToshiba
HK$10.87
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 13 ns 250 ns @ 2 V 0.004mA Through Hole PDIP 16 19.25 x 6.4 x 3.5mm 3.5mm 19.25mm
RS Stock No. 662-7351
Mfr. Part No.CD74HCT4538M96
HK$4.96
Each (In a Pack of 10)
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. 761-4381
Mfr. Part No.74VHC123AMX
HK$4.18
Each (In a Pack of 10)
units
74VHC Monostable Multivibrator 2 -25mA 25mA 90 μs 29.5ns 0.04mA Surface Mount SOIC 16 9.9 x 3.9 x 1.45mm 1.45mm 9.9mm
RS Stock No. 145-1019
Mfr. Part No.CD74HCT221M
HK$4.96
Each (In a Tube of 40)
units
HCT Monostable Multivibrator 2 -4mA 4mA 14 ns 42 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. 662-8461
Mfr. Part No.SN74LV221APWR
HK$11.47
Each (In a Pack of 5)
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. 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. 919-8989
Mfr. Part No.LTC6993CS6-1TRMPBF
HK$19.883
Each (On a Reel of 500)
units
LVCMOS, LVTTL Monostable Multivibrator 2 -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. 662-7291
Mfr. Part No.CD74HCT221M96
HK$5.99
Each (In a Pack of 5)
units
HCT Monostable Multivibrator 2 -4mA 4mA 14 ns 42 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. 162-6981
Mfr. Part No.CD74HCT4538M96
HK$2.33
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. 303-927
Mfr. Part No.SN74221N
HK$49.03
Each
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
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