74HC4538DB,112

Overview

The Nexperia 74HC4538DB,112 is a dual retriggerable-resettable monostable multivibrator housed in an SSOP16 package (SOT338-1). 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 multivibrators with separate trigger inputs (nA for HIGH-to-LOW, nB for LOW-to-HIGH) and direct reset inputs (nCD). Pulse width is determined by external timing components REXT and CEXT using the formula TW = 0.7 × REXT × CEXT. Propagation delays range from 24 ns to 80 ns depending on voltage.

Feature Summary

• Dual precision monostable multivibrator architecture with retriggerable and resettable functionality
• Schmitt-trigger action on inputs provides high tolerance to slow rise and fall times
• Complementary outputs (nQ and nQ) available for each multivibrator channel
• Inputs include clamp diodes allowing interface to voltages exceeding VCC

Applications

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

Procurement Notes

Verify the specific ordering suffix ',112' corresponds to the SSOP16 (SOT338-1) package variant. Confirm that the component meets RoHS compliance requirements for your target market. Check the latest product status as package options may change; verify if the SSOP16 version remains in production or has been superseded by other packages like SO16 or TSSOP16.

Selection Notes

Select this component when dual independent monostable circuits are required in a compact surface-mount form factor. Ensure the application utilizes external resistors and capacitors compatible with the specified REXT and CEXT ranges. Verify that the input signal edges meet the Schmitt-trigger thresholds for reliable triggering. Consider power dissipation limits if operating at maximum temperature ranges.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. The 74HC4538 family includes variants in different packages such as SO16 (74HC4538D) and TSSOP16 (74HC4538PW). The DB suffix specifically denotes the SSOP16 package, which was listed in earlier revisions but removed in Rev 5 of the datasheet, indicating potential discontinuation or replacement by other package types.

Replacement Considerations

Public confirmed substitutes include 74HC4538PW,118 and 74HC4538D,653. These alternatives offer identical logical functionality but differ in physical packaging (TSSOP16 or SO16). Verify pin compatibility and thermal characteristics before substitution.