74HC4538D,652

Overview

The Nexperia 74HC4538D,652 is a dual retriggerable precision monostable multivibrator housed in an SO16 (SOT109-1) package. It operates within a supply voltage range of 2.0 V to 6.0 V and supports ambient temperatures from -40 °C to +125 °C. The device features two independent circuits, each with dedicated trigger inputs (nA for HIGH-to-LOW, nB for LOW-to-HIGH), direct reset inputs (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. Propagation delays range from 45 ns to 265 ns depending on voltage, with typical pulse width variation of ±0.2% over temperature.

Feature Summary

• Dual precision monostable multivibrators with separate timing pins for each channel
• Retriggerable operation allowing pulse lengthening via subsequent trigger edges
• Schmitt-trigger action at inputs ensures tolerance to slow rise and fall times
• Direct active-LOW reset input terminates output pulses immediately

Applications

• Pulse generation and shaping circuits
• Timing delay applications requiring precise duration control
• Debouncing switches or contacts
• Frequency division and pulse stretching

Procurement Notes

Verify component authenticity through authorized Nexperia distributors or official channels. Confirm the specific ordering suffix matches the required package type, as variants exist. Check current product status, as availability may change due to manufacturing updates or lifecycle transitions. Ensure design compliance with specified absolute maximum ratings to prevent damage.

Selection Notes

Select this component when dual independent monostable functions are required in a single package. Verify that the external timing resistor and capacitor values align with the recommended operating conditions. Consider the SO16 package dimensions for PCB layout constraints. Ensure the application voltage falls within the 2.0 V to 6.0 V range for optimal performance.

Part Context

This part belongs to the Nexperia 74HC series of high-cmOS logic devices. It is functionally compatible with other industry-standard dual monostable multivibrators but offers specific Nexperia characteristics regarding power consumption and noise immunity. The 'D' suffix indicates the SO16 plastic small outline package variant.

Replacement Considerations

Check for equivalent parts from other manufacturers if the 74HC4538D,652 is unavailable. Ensure any substitute maintains the same pinout, logic levels, and timing accuracy. Verify package compatibility and thermal characteristics before integration.