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Monostable/astable multivibrator

The HEF4047B is a retriggerable astable multivibrator that can be configured as either a positive-edge or negative-edge triggered monostable multivibrator. The output pulse width is programmed by selection of external components (Rt and Ct). 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
HEF4047BT HEF4047BT,653 933372910653 SOT108-1 Order product
HEF4047BT HEF4047BT,652 933372910652 SOT108-1 Order product

Features and benefits


  • Monostable (one-shot) or astable (free-running) operation
  • True and complemented buffered outputs
  • Only one external resistor and capacitor required

Monostable multivibrator

  • Positive- or negative-edge triggering
  • Output pulse width independent of trigger pulse duration
  • Retriggerable option for pulse-width expansion
  • Long pulse width possible using small RC components with external counter provision
  • Fast recovery time independent of pulse width
  • Pulse-width accuracy maintained at duty cycles approaching 100%

Astable multivibrator

  • Free-running or gatable operating modes
  • 50% duty cycle
  • Oscillator output available



Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
HEF4047BTProduction4.5 - 15.5CMOS± 2.450medium-40~85691.026SO14


Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackagePackage informationReflow-/Wave solderingPacking
( 9333 729 10653 )
Reel 13" Q1/T1 CECC
( 9333 729 10652 )
ActiveHEF4047BTBulk Pack, CECC

Quality, reliability & chemical content

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

Documentation (4)

File nameTitleTypeDate
HEF4047BMonostable/astable multivibratorData sheet2017-03-23
AN11051Pin FMEA HEF4000 familyApplication note2019-01-09
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
HEF4047BTHEF4047BT,653933372910653Reel 13" Q1/T1 CECCOrder product
HEF4047BTHEF4047BT,652933372910652Bulk Pack, CECCOrder 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.