74HC7540DB,118

Overview

The Nexperia 74HC7540DB,118 is an octal Schmitt trigger buffer and line driver featuring inverting outputs with three-state capability. It operates within a supply voltage range of 2.0 V to 6.0 V and utilizes the SO20 (SOT163-1) plastic small outline package. The device includes two active LOW output enable inputs (OE1 and OE2) that force outputs into a high-impedance state when asserted HIGH. Inputs incorporate clamp diodes for interfacing with voltages exceeding VCC.

Feature Summary

• Schmitt-trigger inputs transform slowly changing signals into sharply defined jitter-free outputs
• Dual independent output enables control high-impedance OFF-states
• Input clamp diodes allow safe interfacing to voltages above the supply rail

Applications

• Line driving applications requiring signal inversion
• Bus-oriented memory and interface drivers
• Clock distribution circuits

Procurement Notes

Verify the ordering suffix '118' corresponds to the standard tape-and-reel packaging configuration. Confirm the specific package variant matches the SOT163-1 (SO20) footprint requirements for your PCB layout. Ensure the design accounts for the absolute maximum ratings regarding total power dissipation derating at elevated temperatures.

Selection Notes

Select this component when an octal inverting buffer with noise-immune Schmitt triggers is required. The dual enable inputs provide flexible bus management compared to single-enable variants. Verify that the CMOS input levels are compatible with the driving logic family, as opposed to the TTL-compatible HCT version.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices manufactured by Nexperia. It is functionally equivalent to the 74HCT7540 but designed for CMOS input levels rather than TTL levels. The DB suffix indicates the SO20 package, distinct from the PW (TSSOP20) or other available form factors.

Replacement Considerations

The 74HCT7540D,118 serves as a direct functional replacement if TTL-compatible input thresholds are preferred over CMOS levels. Other manufacturers may offer pin-compatible octal buffers, but verify Schmitt trigger specifications and electrical characteristics match the design requirements.