HEF4938BT,118

Multivibrators Overview

The HEF4938BT,118 is a dual precision monostable multivibrator from NXP Semiconductors. It contains two independent retriggerable-resettable circuits, each featuring active LOW trigger/retrigger inputs (nA), active HIGH trigger/retrigger inputs (nB), and an overriding active LOW direct reset input (nCD). The output pulse width is determined by external timing components REXT and CEXT, with a typical variation of ±0.2% over the temperature range. It operates on a supply voltage of 3 V to 15 V.

Multivibrators Feature Summary

• Dual retriggerable and resettable monostable multivibrator architecture
• Triggering capability from both leading and trailing edges
• High tolerance for slow trigger rise and fall times via Schmitt trigger action
• Fully static operation with standardized symmetrical output characteristics

Multivibrators Applications

• Timing generation and pulse shaping in electronic circuits
• Debouncing mechanical switches or contacts
• Delay line applications requiring precise pulse duration control

Multivibrators Procurement Notes

Verify the specific package variant against project requirements. The 'BT' suffix indicates the SO16 plastic small outline package. Confirm that the ordering code matches the exact pin configuration and physical dimensions needed for the PCB layout. Ensure compatibility with the intended operating voltage range and ambient temperature conditions specified in the datasheet.

Multivibrators Selection Notes

Select this component when dual independent timing channels are required within a single package. It is suitable for designs needing high accuracy with minimal temperature drift. Consider the external resistor and capacitor values to achieve the desired pulse width. Verify that the supply voltage falls within the recommended 3 V to 15 V range for optimal performance.

Multivibrators Part Context

The HEF4938B belongs to the HEF series of CMOS logic devices manufactured by NXP Semiconductors. This series utilizes LOCMOS technology to ensure precise control of output parameters. The device is designed for general-purpose digital applications requiring reliable monostable multivibrator functionality with robust noise immunity.

Multivibrators Replacement Considerations

HEF4938BP