HEF4538BT,653

Multivibrators Overview

The HEF4538BT,653 is a dual precision monostable multivibrator from the Nexperia HEF4000 series. It operates within a supply voltage range of 3 V to 15 V and features two independent retriggerable-resettable circuits. Each circuit includes active LOW trigger/retrigger inputs (nA), active HIGH trigger/retrigger inputs (nB), an overriding active LOW direct reset input (nCD), and complementary outputs (nQ, nQ). The output pulse width is determined by external timing components REXT and CEXT, with typical pulse width variation over the temperature range being ±0.2%. Propagation delays vary based on load capacitance and supply voltage.

Multivibrators Feature Summary

• Tolerant of slow trigger rise and fall times due to Schmitt trigger action
• CMOS low power dissipation with high noise immunity
• Fully static operation with standardized symmetrical output characteristics
• ESD protection exceeding 2000 V (HBM) and 1000 V (CDM)

Multivibrators Applications

• Pulse generation and shaping
• Timing delay circuits
• Debouncing switches

Multivibrators Procurement Notes

Verify the specific ordering suffix '653' corresponds to the SO16 plastic small outline package (SOT109-1) with a -40 °C to +125 °C temperature range. Confirm that the component meets JEDEC standard JESD 13-B requirements. Ensure compatibility with the specified operating conditions before finalizing procurement.

Multivibrators Selection Notes

Select this component for applications requiring precise monostable timing with wide supply voltage flexibility. Consider the LOCMOS technology for accurate pulse width control. Evaluate the propagation delay specifications against the required signal speed and load capacitance. Verify that the package dimensions fit the target PCB layout constraints.

Multivibrators Part Context

This device belongs to the HEF4000 logic family, utilizing Local Oxide CMOS (LOCMOS) technology. It is designed as a dual precision monostable multivibrator, offering two independent channels in a single package. The part is manufactured by Nexperia and is intended for general-purpose digital logic applications requiring reliable timing functions.

Multivibrators Replacement Considerations

Check for compatible parts within the HEF4538B family or equivalent dual monostable multivibrators from other manufacturers. Ensure pinout compatibility and matching electrical characteristics such as supply voltage range and propagation delays.