HEF4938BT

Dual precision monostable multivibrator


The HEF4938B is a dual retriggerable-resettable monostable multivibrator. Each multivibrator has an active LOW trigger/retrigger input (nA), an active HIGH trigger/retrigger input (nB), an overriding active LOW direct reset input (nCD), an output (nQ) and its complement (nQ), and two pins (CEXT, always connected to ground, and nREXT/CEXT) for connecting the external timing components CEXT and REXT. The typical pulse width variation over the specified temperature range is ±0.2 %.

The multivibrator may be triggered by either the positive or the negative edges of the input pulse and will produce an accurate output pulse with a pulse width range of 10 µs to infinity. The duration and accuracy of the output pulse are determined by the external timing components CEXT and REXT. The output pulse width (tW) is equal to REXT x CEXT. The linear design techniques in LOCMOS (Local Oxide CMOS) guarantee precise control of the output pulse width. A LOW level at nCD terminates the output pulse immediately. The trigger inputs’ Schmitt trigger action makes the circuit 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 and benefits

  • Separate reset inputs
  • Triggering from leading or trailing edge
  • Tolerant of slow trigger 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 +85 °C
  • Complies with JEDEC standard JESD 13-B
All information on this product information page is subject to the subsequent disclaimers:

Devices listed on this page should not be used for new designs!

This product has been discontinued.
Click here for discontinuation information.

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Show functional diagram

Block diagram: HEF4538BP, HEF4538BT, HEF4938BT
Block diagram: HEF4538BP, HEF4538BT, HEF4938BT

Parametrics of this product

Type numberPackageNr of pinsPackage nameProduct statustpd(ns)VCC(V)Power dissipation considerationsLogic switching levelsOutput drive capability(mA)Description
HEF4938BTSOT109-1
(SO16)		16SO16End of life60@15V5.5-15.5 VLow Power or Automotive ApplicationsCMOS+/- 2.4 mA @ 15 VDual Retriggerable Precision Monostable Multivibrator with Reset

Similar products

Package

All type numbers in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
HEF4938BTHEF4938BT,1129350 597 80112Withdrawn
Replacement product		SOT109-1
(SO16) 		TubeStandard Marking
HEF4938BTHEF4938BT,1189350 597 80118Withdrawn
Replacement product		SOT109-1
(SO16) 		Reel Pack, SMD, 13"Standard Marking

Outline drawing

Package VersionPackage NamePackage DescriptionReference CodesIssue Date
SOT109-1SO16plastic small outline package; 16 leads; body width 3.9 mmMS-012 (JEDEC); 076E07 (IEC); 2003-02-19

Related documents

Reflow soldering

Selection guide

Wave soldering

Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
HEF4938BT93505978011230-Jun-1231-Dec-12DN 201112005DNFull WithdrawalMultiple Source. Limited Availability. No Replacement Part.
HEF4938BT93505978011830-Jun-1231-Dec-12DN 201112005DNFull WithdrawalMultiple Source. Limited Availability. No Replacement Part.

Quality, reliability & chemical content

All type numbers in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
HEF4938BTHEF4938BT,112Not availableweek 6, 20042.993.3444816053511703E811
HEF4938BTHEF4938BT,118Not availableweek 6, 20042.993.3444816053511703E811
Quality and reliability disclaimer

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Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
HEF4938BT93505978011230-Jun-1231-Dec-12DN 201112005DNFull WithdrawalMultiple Source. Limited Availability. No Replacement Part.
HEF4938BT93505978011830-Jun-1231-Dec-12DN 201112005DNFull WithdrawalMultiple Source. Limited Availability. No Replacement Part.

Documentation for this product

File nameTitleTypeFormatDate
HEF4938BDual precision monostable multivibratorData sheetpdf2011-11-15
AN11051Pin FMEA HEF4000 familyApplication notepdf2011-04-28

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