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Programmable delay timer with oscillator

The 74HC5555 is a precision programmable delay timer which consist of:

  • 24-stage binary counter
  • integrated oscillator (using external timing components)
  • retriggerable/non-retriggerable monostable
  • automatic power-ON reset
  • output control logic
  • oscillator control logic
  • overriding asynchronous master reset (MR).

The 74HC5555 inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74HC5555D 74HC5555D,118 933998590118 SOT109-1 Order product
74HC5555D 74HC5555D,112 933998590112 SOT109-1 Order product

Features and benefits

  • Supply voltage range from 2.0 V to 6.0 V
  • CMOS input levels
  • Positive and negative edge triggered
  • Retriggerable or non-retriggerable
  • Programmable delay:
    • minimum: 100 ns
    • maximum: depends on input frequency and division ratio
  • Divide-by range of 2 to 224
  • Direct reset terminates output pulse
  • Very low power consumption in triggered start mode
  • 3 oscillator operating modes:
    • RC oscillator
    • Crystal oscillator
    • External oscillator
  • Device is unaffected by variations in temperature and VCC when using an external oscillator
  • Automatic power-ON reset
  • Schmitt trigger action on both trigger inputs
  • Direct drive for a power transistor
  • High precision due to digital timing
  • Complies with JEDEC standard no. 7 A
  • ESD protection:
    • HBM EIA/JESD22-A114A exceeds 2000 V
    • MM EIA/JESD22-A115-A exceeds 200 V
  • Specified from -40 °C to +85 °C and -40 °C to +125 °C


  • Motor control
  • Delay circuits
  • Precision timing
  • Domestic appliances


Type numberProduct statusVCC (V)Output drive capability (mA)Logic switching levelstpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74HC5555DProduction2.0 - 6.0- 20/ + 25CMOS89low-40~125641.021SO16


Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackagePackage informationReflow-/Wave solderingPacking
( 9339 985 90118 )
Reel 13" Q1/T1
( 9339 985 90112 )
Active74HC5555DBulk Pack

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
Quality and reliability disclaimer

Documentation (5)

File nameTitleTypeDate
74HC5555Programmable delay timer with oscillatorData sheet2018-07-05
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08


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Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74HC5555D74HC5555D,118933998590118Reel 13" Q1/T1Order product
74HC5555D74HC5555D,112933998590112Bulk PackOrder product


As a Nexperia customer you can order samples via our sales organization or directly via our Online Sample Store:

Sample orders normally take 2-4 days for delivery.

If you do not have a direct account with Nexperia our network of global and regional distributors is available and equipped to support you with Nexperia samples.