HEF4021B

8-bit static shift register

The HEF4021B is an 8-bit static shift register (parallel-to-serial converter) with a synchronous serial data input (DS), a clock input (CP), an asynchronous active HIGH parallel load input (PL), eight asynchronous parallel data inputs (D0 to D7) and buffered parallel outputs from the last three stages (Q5 to Q7).

Each register stage is a D-type master-slave flip-flop with a set direct (SD) and clear direct (CD) input. Information on D0 to D7 is asynchronously loaded into the register while PL is HIGH, independent of CP and DS. When PL is LOW, data on DS is shifted into the first register position and all the data in the register is shifted one position to the right on the LOW-to-HIGH transition of CP. Schmitt trigger action makes the clock input highly tolerant of slower rise and fall times.

It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually ground). Unused inputs must be connected to VDD, VSS, or another input.

Features

  • Tolerant of slower rise and fall times
  • Fully static operation
  • 5 V, 10 V, and 15 V parametric ratings
  • Standardized symmetrical output characteristics
  • Specified from -40 °C to +125 °C
  • Complies with JEDEC standard JESD 13-B

Parametrics

Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)fmax (MHz)No of bitsPower dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
HEF4021BTProduction3.0 - 15CMOS± 2.440408medium-40~85898.148SO16
HEF4021BTTProduction3.0 - 15CMOS± 2.440408medium-40~851213.850.9TSSOP16

Package

Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
HEF4021BT
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActiveHEF4021BTHEF4021BT,653
( 9333 727 40653 )
Bulk Pack, CECCActiveHEF4021BTHEF4021BT,652
( 9333 727 40652 )
HEF4021BTT
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveStandard MarkingHEF4021BTTJ
( 9353 024 48118 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
HEF4021BTHEF4021BT,653HEF4021BTweek 12, 200575.32.993.34E811
HEF4021BTHEF4021BT,652HEF4021BTweek 12, 200575.32.993.34E811
HEF4021BTTHEF4021BTTJHEF4021BTTAlways Pb-free11
Quality and reliability disclaimer

Documentation (14)

File nameTitleTypeDate
HEF4021B8-bit static shift registerData sheet2017-03-17
AN11051Pin FMEA HEF4000 familyApplication note2019-01-09
Nexperia_Selection_guide_2020Nexperia Selection Guide 2020Selection guide2020-01-31
SOT109-1_431SO16; Reel sulfur barrier pack, SMD, 13" Q1/T1 standard product orientation Orderable part number ending ,431 or Z Ordering code (12NC) ending 431Packing2016-08-25
SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm bodyOutline drawing2018-10-18
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT109-1_118SO16; Reel pack for SMD, 13"; Q1/T1 product orientationPacking2020-02-14
SOT403-1_118TSSOP16; Reel pack for SMD, 13"; Q1/T1 product orientationPacking2020-02-14
SOT403-1_623TSSOP16; Reel pack; SMD, 13"; Q1 Standard product orientation; Orderable part number ending, 623 or HL; Ordering code (12NC) ending 623Packing2013-05-15
SOT403-1_128TSSOP16; Reel pack; SMD, 13", Turned Q4/T2 180 deg product orientation Orderable part number ending ,128 or HP Ordering code (12NC) ending 128Packing2014-10-14
SOT403-1_653TSSOP16; Reel pack; SMD, 13"; Q1 Standard product orientation; Orderable part number ending, 653 or HL; Ordering code (12NC) ending 653Packing2013-05-15
SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.1 mm bodyOutline drawing2018-11-14
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08

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