74HCT4538D-Q100,11

Overview

The Nexperia 74HCT4538D-Q100,11 is a dual retriggerable-resettable monostable multivibrator from the HCT logic family. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL input levels with CMOS low power dissipation. The device provides two independent channels, each equipped with separate trigger inputs (nA for falling edge, nB for rising edge) and a direct reset input (nCD). Output pulse width is determined by external timing components REXT and CEXT using the formula TW = 0.7 × REXT × CEXT. It is housed in an SO16 plastic small outline package (SOT109-1) and supports operating temperatures from -40 °C to +125 °C.

Feature Summary

• Automotive qualification compliant with AEC-Q100 Grade 1 standards
• Dual precision monostable multivibrators with retriggerable and resettable functionality
• Schmitt-trigger action ensures tolerance to slow trigger rise and fall times
• Inputs include clamp diodes allowing interface to voltages exceeding VCC

Applications

• Timing generation circuits requiring precise pulse width control
• Debouncing switches or contacts in automotive environments
• Pulse stretching or narrowing applications
• Frequency division and waveform shaping

Procurement Notes

Verify that the ordering suffix matches the required package type; 'D' indicates the SO16 (SOT109-1) variant. Confirm the grade corresponds to AEC-Q100 requirements for your specific application environment. Ensure the design accounts for the specified temperature range up to +125 °C. Cross-reference the datasheet revision date to ensure compatibility with current manufacturing specifications.

Selection Notes

Select this component when dual independent monostable functions are needed within a single package. The HCT series is appropriate for systems interfacing with TTL logic levels while maintaining CMOS power characteristics. Consider the SO16 package dimensions if board space allows. Verify that the external timing components can handle the required pulse width accuracy over the intended temperature range.

Part Context

This part belongs to the Nexperia 74HCT4538-Q100 family of dual retriggerable monostable multivibrators. It is specifically designed for automotive applications due to its AEC-Q100 Grade 1 qualification. The 'D' suffix distinguishes it from other package options like the TSSOP16 variant (PW), ensuring correct footprint selection during PCB layout.

Replacement Considerations

The 74HC4538D-Q100 serves as a high-speed CMOS alternative within the same automotive qualified family. Designers should verify voltage level compatibility and propagation delay differences when substituting HC variants for HCT versions.