MC74HC4538AFELG

Multivibrators Overview

The MC74HC4538AFELG is a dual precision monostable multivibrator manufactured by onsemi. It operates within a supply voltage range of 3.0 to 6.0 V and supports an operating temperature from -55°C to +125°C. The device features propagation delays of up to 295 ns at 2.0 V and 50 ns at 6.0 V, with a maximum quiescent supply current of 350 µA. Packaged in SOEIAJ-16 (Case 9661), it contains two independent retriggerable circuits triggered by positive or negative edges.

Multivibrators Feature Summary

• Retriggerable operation allows pulse extension when triggered during the timing cycle
• Conditioned trigger inputs eliminate restrictions on rise and fall times
• Active-low reset function forces outputs to defined states regardless of timing status
• Outputs directly interface with CMOS, NMOS, and TTL logic families

Multivibrators Applications

• Pulse width generation and timing control
• Debouncing mechanical switches
• Frequency division and pulse stretching

Multivibrators Procurement Notes

Verify package suffix F corresponds to SOEIAJ-16 (Case 9661) and ELG indicates lead-free tape and reel packaging. Confirm RoHS compliance and check for end-of-life status as previous variants are obsolete. Ensure ordering matches the specific manufacturer part number MC74HC4538AFELG.

Multivibrators Selection Notes

Select this component for designs requiring precise monostable timing with wide input transition tolerance. The HC series offers speed comparable to low-power Schottky TTL while maintaining CMOS noise immunity. Verify external timing components Rx and Cx values against required pulse widths using the datasheet equations.

Multivibrators Part Context

This device belongs to the MC74HC4538A family of dual precision monostable multivibrators. It shares pinout compatibility with the MC14538B and provides high-speed performance suitable for general-purpose logic applications requiring reliable pulse generation and signal conditioning.

Multivibrators Replacement Considerations

MC74HC4538ADG

Multivibrators FAQ

What is the recommended capacitor type for timing?

Polystyrene capacitors are recommended for optimum pulse width control. Electrolytic capacitors are not recommended due to high leakage currents.

How does the device handle power-down conditions?

Large timing capacitors may discharge through input protection diodes during power-down. An external damping diode is recommended to prevent damage if the supply turns off rapidly.