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HEF4541BT

Programmable timer

The HEF4541B is a programmable timer which consists of a 16-stage binary counter, an integrated oscillator to be used with external timing components, an automatic power-on reset and output control logic. The frequency of the oscillator is determined by the external components RTC and CTC within the frequency range 1 Hz to 100 kHz. This oscillator may be replaced by an external clock signal at input RS, the timer advances on the positive-going transition of RS. A LOW on the auto reset input (AR) and a LOW on the master reset input (MR) enables the internal power-on reset. A HIGH level at input MR resets the counter independent on all other inputs. Resetting disables the oscillator to provide no active power dissipation.

A HIGH at input AR turns off the power-on reset to provide a low quiescent power dissipation of the timer. The 16-stage counter divides the oscillator frequency by 28, 210, 213 or 216 depending on the state of the address inputs (A0, A1). The divided oscillator frequency is available at output O. The phase input (PH) features a complementary output signal. When the mode select input (MODE) is LOW the timer is a single transition timer and when HIGH the timer is a 2n frequency divider.

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.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
HEF4541BT HEF4541BT,512 933508000512 SOT108-1 Order product
HEF4541BT HEF4541BT,518 933508000518 SOT108-1 Order product

Features and benefits

  • Fully static operation
  • 5 V, 10 V, and 15 V parametric ratings
  • Standardized symmetrical output characteristics
  • Operates across the automotive temperature range −40 °C to +85 °C
  • Complies with JEDEC standard JESD 13-B

Applications

Parametrics

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
HEF4541BTProduction4.5 - 15.5- 4/ + 2.7CMOS38medium-40~85531.010SO14

Package

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackagePackage informationReflow-/Wave solderingPacking
HEF4541BTHEF4541BT,512
( 9335 080 00512 )
ActiveHEF4541BT
SO14
(SOT108-1)
SOT108-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Tube in Drypack
HEF4541BT,518
( 9335 080 00518 )
ActiveHEF4541BTReel 13" Q1/T1 in Drypack

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackagePackage informationReflow-/Wave solderingPacking
HEF4541BTHEF4541BT,653
( 9335 080 00653 )
Withdrawn / End-of-lifeHEF4541BT
SO14
(SOT108-1)
SOT108-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECC
HEF4541BT,652
( 9335 080 00652 )
Withdrawn / End-of-lifeHEF4541BTBulk Pack, CECC

Discontinuation information

Type numberOrderable part numberOrdering codeLast time buy dateLast time delivery dateReplacement productStatusComments
HEF4541BTHEF4541BT,653933508000653
HEF4541BTHEF4541BT,652933508000652

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
HEF4541BTHEF4541BT,512HEF4541BT75.32.993.34E813
HEF4541BTHEF4541BT,518HEF4541BT75.32.993.34E813

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
HEF4541BTHEF4541BT,653HEF4541BT75.32.993.34E811
HEF4541BTHEF4541BT,652HEF4541BT75.32.993.34E811
Quality and reliability disclaimer

Documentation (4)

File nameTitleTypeDate
HEF4541BProgrammable timerData sheet2017-07-20
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

Support

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Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
HEF4541BTHEF4541BT,512933508000512Tube in DrypackOrder product
HEF4541BTHEF4541BT,518933508000518Reel 13" Q1/T1 in DrypackOrder product

Sample

As a Nexperia customer you can order samples via our sales organization or directly via our Online Sample Store: https://extranet.nexperia.com.

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.