74HCT4538PW,118

Multivibrators Overview

The Nexperia 74HCT4538PW,118 is a dual retriggerable-resettable precision monostable multivibrator housed in a TSSOP16 plastic thin shrink small outline package (SOT403-1). It operates within a supply voltage range of 4.5 V to 5.5 V and supports ambient temperatures from -40 °C to +125 °C. Each multivibrator features two trigger/retrigger inputs (nA and nB), a direct reset input (nCD), and complementary outputs (nQ and nQ). Pulse width is determined by external components REXT and CEXT using the formula TW = 0.7 × REXT × CEXT. Typical pulse width variation over temperature is ± 0.2 %. Propagation delays are typically 35 ns at 4.5 V.

Multivibrators Feature Summary

• Tolerant of slow trigger rise and fall times due to Schmitt-trigger action in input stages
• Capable of triggering from either positive or negative input edges with separate reset inputs
• Provides high noise immunity and CMOS low power dissipation while maintaining TTL input levels

Multivibrators Applications

• Pulse generation and timing circuits requiring precise duration control
• Debouncing switches or contacts to eliminate signal bounce effects
• Frequency division and pulse widening applications in digital systems

Multivibrators Procurement Notes

Verify the specific ordering suffix ,118 against the manufacturer's current catalog to confirm packaging details such as reel size or tape-and-reel specifications. Ensure the component matches the SOT403-1 TSSOP16 package outline dimensions for board layout compatibility. Confirm that the device status is listed as 'Product data sheet' indicating production availability rather than development or preliminary status.

Multivibrators Selection Notes

Select this component when dual independent monostable circuits are required in a single package. The HCT logic family ensures compatibility with TTL-driven systems while offering CMOS power efficiency. Verify that the external timing resistor and capacitor values selected will produce the desired pulse width within the specified accuracy limits across the operating temperature range.

Multivibrators Part Context

This device belongs to the 74HCT series of high-speed CMOS logic functions. It is functionally compatible with other 74HCT monostable multivibrators but offers dual channels in a compact surface-mount package. The PW variant specifically denotes the TSSOP16 package, distinguishing it from the SO16 (D) package version. It is designed for general-purpose digital applications requiring reliable pulse generation.

Multivibrators Replacement Considerations

The 74HCT4538D is a pin-compatible alternative housed in an SO16 package. Both variants share identical electrical characteristics and functionality. When substituting, verify that the PCB footprint accommodates the body width difference between TSSOP16 and SO16 packages.