HEF4538BT-Q100J

Multivibrators Overview

The HEF4538BT-Q100J is a dual precision monostable multivibrator from the HEF series, manufactured by Nexperia. It operates within a supply voltage range of 3 V to 15 V and supports ambient temperatures from -40 °C to +125 °C. The device features two independent channels, each with active LOW trigger/retrigger (nA), active HIGH trigger/retrigger (nB), and overriding active LOW direct reset (nCD) inputs. Outputs include nQ and its complement nQ. Pulse width is determined by external REXT and CEXT components, typically ranging from 10 μs to infinity. Propagation delays vary with load capacitance; for example, at 15 V, tPHL max is 80 ns and tPLH max is 80 ns with zero load.

Multivibrators Feature Summary

• Automotive qualification in accordance with AEC-Q100 Grade 1 standard
• Tolerant of slow trigger rise and fall times due to Schmitt trigger action
• Fully static operation with CMOS low power dissipation
• High noise immunity and standardized symmetrical output characteristics

Multivibrators Applications

• Automotive electronic systems requiring precise timing control
• Pulse generation circuits utilizing external RC timing networks
• Signal conditioning applications leveraging Schmitt trigger input tolerance

Multivibrators Procurement Notes

Verify that the component matches the specific HEF4538BT-Q100J designation including the SO16 package variant SOT109-1. Confirm compliance with AEC-Q100 Grade 1 requirements if automotive deployment is intended. Ensure design margins respect the absolute maximum ratings, particularly regarding supply voltage limits and total power dissipation derating above 110 °C.

Multivibrators Selection Notes

Select this component when dual independent monostable functions are required in an automotive environment. It is suitable for designs needing high noise immunity and tolerance for slow signal transitions. Consider the external timing component constraints, specifically the minimum permissible resistance based on capacitor leakage currents, to maintain specified pulse width accuracy across the operating temperature range.

Multivibrators Part Context

This part belongs to the HEF4000 series of CMOS logic devices produced by Nexperia. It is specifically designed as a dual retriggerable-resettable monostable multivillator. The product utilizes LOCMOS technology to ensure precise control over output pulse widths. It is distinct from astable multivibrators or other timer ICs by its specific trigger and reset pin configurations.

Multivibrators Replacement Considerations

HEF4538BT,653