74HC4520; 74HCT4520

Dual 4-bit synchronous binary counter

The 74HC4520; 74HCT4520 are dual 4-bit internally synchronous binary counters with two clock inputs (nCP0 and nCP1). They have buffered outputs from all 4 bit positions (nQ0 to nQ3) and an asynchronous master reset input (nMR). The counter advances on the LOW-to-HIGH transition of nCP0 when nCP1 is HIGH. It also advances on the HIGH-to-LOW transition of nCP1 when nCP0 is LOW. Either nCP0 or nCP1 may be used as the clock input to the counter. The other clock input may be used as a clock enable input. A HIGH on nMR, resets the counter (nQ0 to nQ3 = LOW) independent of nCP0 and nCP1. Inputs include clamp diodes. It enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Features and benefits

  • Wide supply voltage range from 2.0 V to 6.0 V
  • CMOS low power dissipation
  • High noise immunity
  • Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
  • Complies with JEDEC standards:
    • JESD8C (2.7 V to 3.6 V)
    • JESD7A (2.0 V to 6.0 V)
  • Input levels:
    • For 74HC4520: CMOS level
    • For 74HCT4520: TTL level
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Specified from -40 °C to +85 °C and -40 °C to +125 °C


  • Multistage synchronous counting
  • Multistage asynchronous counting
  • Frequency dividers


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
74HC4520DProduction2.0 - 6.0± 5.2CMOS24low-40~125651.022SO16
74HC4520PWProduction2.0 - 6.0± 5.2CMOS24low-40~125981.023.6TSSOP16
74HCT4520DProduction4.5 - 5.5± 4TTL24low-40~125621.019.7SO16


Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
Reel 13" Q1/T1Active74HC4520D74HC4520D,118
( 9337 149 00118 )
Bulk PackActive74HC4520D74HC4520D,112
( 9337 149 00112 )
Reel 13" Q1/T1ActiveHC452074HC4520PW,118
( 9351 891 30118 )
Bulk PackActiveHC452074HC4520PW,112
( 9351 891 30112 )
Reel 13" Q1/T1Active74HCT4520D74HCT4520D,118
( 9337 153 80118 )
Bulk PackActive74HCT4520D74HCT4520D,112
( 9337 153 80112 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC4520D74HC4520D,11874HC4520Dweek 4, 200439.61.57.62E411
74HC4520D74HC4520D,11274HC4520Dweek 4, 200439.61.57.62E411
74HC4520PW74HC4520PW,11874HC4520PWweek 10, 200539.61.57.62E411
74HC4520PW74HC4520PW,11274HC4520PWweek 10, 200539.61.57.62E411
74HCT4520D74HCT4520D,11874HCT4520Dweek 4, 200439.61.57.62E411
74HCT4520D74HCT4520D,11274HCT4520Dweek 4, 200439.61.57.62E411
Quality and reliability disclaimer

Documentation (8)

File nameTitleTypeDate
74HC_HCT4520Dual 4-bit synchronous binary counterData sheet2020-10-09
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm bodyPackage information2021-01-06
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.1 mm bodyPackage information2020-04-21


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