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. 688-1549
Mfr. Part No.MC14538BDR2G
MYR2.062
Each (In a Pack of 5)
units
4000 Monostable Multivibrator 2 - - 80 ns 600 ns @ 5 V 0.7mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 663-0385
Mfr. Part No.CD74HC4538E
MYR2.974
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. 809-5983
Mfr. Part No.SN74LVC1G123DCTR
MYR1.663
Each (In a Pack of 15)
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. 170-3571
Mfr. Part No.MC14528BDR2G
MYR0.912
Each (On a Reel of 2500)
units
MC Monostable Multivibrator 2 -0.36mA 2.4mA 10 μs 1000 ns @ 50 pF - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 145-0153
Mfr. Part No.CD74HC4538E
MYR2.611
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. 178-4724
Mfr. Part No.MC14528BDG
MYR2.08
Each (In a Tube of 48)
units
4000 Monostable Multivibrator 2 - - 55 ns 650 ns @ 5 V 0.02mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 124-2262
Mfr. Part No.74HC4538D,652
BrandNexperia
MYR2.142
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. 663-2460
Mfr. Part No.SN74LS221D
MYR5.69
Each (In a Pack of 5)
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 80 ns @ 5 V 4.7mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 125-0045
Mfr. Part No.MC74HC4538ADG
MYR1.834
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. 663-2678
Mfr. Part No.SN74LV123APW
MYR2.62
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. 663-0161
Mfr. Part No.CD74HC221M
MYR3.274
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. 186-9200
Mfr. Part No.MC14521BDG
MYR2.703
Each (In a Pack of 25)
units
- Frequency Divider - - - 120 ns 2600 ns @ 50 pF 150µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 151-3351
Mfr. Part No.74HC4538PW,118
BrandNexperia
MYR0.909
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. 145-5995
Mfr. Part No.CD4098BM
MYR1.88
Each (In a Tube of 40)
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. 186-8798
Mfr. Part No.74VHC123AM
MYR2.03
Each (In a Tube of 48)
units
VHC Monostable Multivibrator 8 -8mA 8mA 5 ns 29.5 ns @ 50 pF 40µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 186-9259
Mfr. Part No.74VHC123AM
MYR2.03
Each (In a Pack of 25)
units
VHC Monostable Multivibrator 8 -8mA 8mA 5 ns 29.5 ns @ 50 pF 40µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 662-7358
Mfr. Part No.CD74HCT423M96
MYR2.70
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. 601-4134
Mfr. Part No.TC4538BP(F)
BrandToshiba
MYR3.86
Each (In a Pack of 5)
units
4000 Monostable Multivibrator 2 - - 25 ns 760 ns @ 5 V 20mA Through Hole PDIP 16 19.25 x 6.4 x 3.5mm 3.5mm 19.25mm
RS Stock No. 178-6982
Mfr. Part No.HEF4528BT,652
BrandNexperia
MYR2.101
Each (In a Tube of 50)
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. 709-3071
Mfr. Part No.CD74HC221EE4
MYR4.47
Each (In a Pack of 5)
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
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