74HC4538PW,118

Overview

The Nexperia 74HC4538PW,118 is a dual retriggerable-resettable monostable multivibrator housed in a TSSOP16 (SOT403-1) package. It operates within a supply voltage range of 2.0 V to 6.0 V and supports an ambient temperature range from -40 °C to +125 °C. The device features two independent multivibrators, each with dedicated trigger inputs (nA for HIGH-to-LOW, nB for LOW-to-HIGH), a direct reset input (nCD), and complementary outputs (nQ and nQ). Pulse width is determined by external timing components REXT and CEXT using the formula TW = 0.7 × REXT × CEXT. Propagation delays vary between 265 ns and 45 ns depending on supply voltage.

Feature Summary

• Dual precision monostable multivibrators with separate reset inputs
• Triggering capability from both rising and falling edges
• Schmitt-trigger action ensures tolerance to slow rise and fall times
• Inputs include clamp diodes for interfacing with voltages exceeding VCC

Applications

• Pulse generation circuits
• Timing delay applications
• Debouncing switches
• Frequency division

Procurement Notes

Verify that the ordering suffix ,118 corresponds to the TSSOP16 package variant. Confirm the specific temperature grade required for the application environment. Ensure external timing component values are selected to maintain pulse width accuracy within specified limits across the operating voltage and temperature ranges.

Selection Notes

Select this component when dual independent monostable functions are required in a compact surface-mount footprint. The HC logic family provides high noise immunity and low power dissipation suitable for general-purpose digital systems. Verify that the external resistor and capacitor values comply with the recommended operating conditions for stable operation.

Part Context

This part belongs to the 74HC series of CMOS logic devices manufactured by Nexperia. It is functionally equivalent to other 74HC4538 variants but differs in packaging. The PW suffix specifically denotes the TSSOP16 plastic thin shrink small outline package, distinguishing it from SO16 or SSOP alternatives.

Replacement Considerations

Direct substitutes include the 74HC4538D variant which utilizes an SO16 package. Other compatible parts must match the dual monostable functionality and HC logic electrical characteristics.