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. 145-3681
Mfr. Part No.MC14538BDTR2G
MYR0.919
Each (On a Reel of 2500)
units
MC Monostable Multivibrator 2 -0.36mA 2.4mA 10 μs 600 ns @ 50 pF - Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 1.05mm 5.1mm
RS Stock No. 103-8394
Mfr. Part No.HEF4538BT,652
BrandNexperia
MYR1.809
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. 807-2343
Mfr. Part No.CD14538BM
MYR1.644
Each (In a Pack of 40)
units
4000 Monostable Multivibrator 2 -4.2mA 4.2mA 140 ns 600 ns@ 50 pF 3000µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 919-8985
Mfr. Part No.LTC6993IS6-1TRMPBF
MYR12.075
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. 540-0427
Mfr. Part No.TC74HC4538AP(F)
BrandToshiba
MYR4.276
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. 436-3096
Mfr. Part No.SN54LS123J
MYR73.91
Each
units
LS Monostable Multivibrator 2 -0.4mA 4mA 40 ns 56 ns @ 5 V 12mA Through Hole CDIP 16 19.56 x 6.92 x 4.57mm 4.57mm 19.56mm
RS Stock No. 307-632
Mfr. Part No.SN74LS123N
MYR3.39
Each
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 56 ns @ 5 V 12mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 186-9164
Mfr. Part No.MC100EL32DG
MYR25.345
Each (In a Pack of 2)
units
ECL Divider 2 - - - - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm
RS Stock No. 153-2888
Mfr. Part No.74HC123PW-Q100,118
BrandNexperia
MYR1.53
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. 170-5405
Mfr. Part No.74LVC1G123DP,125
BrandNexperia
MYR1.578
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. 170-8002
Mfr. Part No.HEF4538BT,653
BrandNexperia
MYR0.604
Each (On a Reel of 2500)
units
HEF Monostable Multivibrator 2 -2.4mA 2.4mA 90 ns 460 ns @ 50 pF - Surface Mount SO 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 186-8822
Mfr. Part No.MC100EL32DG
MYR23.332
Each (In a Tube of 98)
units
ECL Divider 2 - - - - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm
RS Stock No. 662-6594
Mfr. Part No.SN74LVC1G123DCTT
MYR5.284
Each (In a Pack of 5)
units
LVC Monostable Multivibrator 1 -32mA 32mA 2.5 ns 18.6 ns @ 1.8 V 0.02mA Surface Mount SSOP 8 2.95 x 2.8 x 1.29mm 1.29mm 2.95mm
RS Stock No. 178-8815
Mfr. Part No.CD74HC123PWR
MYR1.408
Each (In a Tube of 90)
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. 162-6973
Mfr. Part No.CD74HCT221M96
MYR1.153
Each (On a Reel of 2500)
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. 145-1068
Mfr. Part No.SN74AHC123AD
MYR0.931
Each (In a Tube of 40)
units
AHC Monostable Multivibrator 2 -8mA 8mA 5 ns 24.1 ns @ 3.3 V 0.004mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 145-5799
Mfr. Part No.SN74LS122D
MYR4.513
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. 162-6961
Mfr. Part No.CD74HC4538PWR
MYR0.656
Each (On a Reel of 2000)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 14 ns 250 ns @ 2 V 0.008mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
RS Stock No. 162-6914
Mfr. Part No.CD14538BPWR
MYR0.633
Each (On a Reel of 2000)
units
4000 Monostable Multivibrator 2 - - 30 ns 600 ns @ 5 V 0.1mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
RS Stock No. 146-0376
Mfr. Part No.74HCT221D,652
BrandNexperia
MYR3.05
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
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