TC74VHCT373AFTEL

Overview

The TC74VHCT373AFTEL is an octal D-type latch with 3-state outputs manufactured using silicon gate C2MOS technology. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature from -40 °C to 85 °C. The device features a typical propagation delay of 7.7 ns at 5 V, a maximum quiescent supply current of 4 μA, and TTL-compatible input thresholds (VIH min 2.0 V, VIL max 0.8 V). It includes power-down protection on all inputs and outputs, allowing 0 to 5.5 V application regardless of supply voltage.

Feature Summary

• High-speed operation comparable to Bipolar Schottky TTL while maintaining CMOS low power dissipation
• TTL input voltage compatibility for direct interfacing with standard logic families
• Power-down protection ensures device safety during mismatched supply or hot board insertion scenarios
• Balanced propagation delays and low noise characteristics ensure signal integrity

Applications

• Level conversion between 3.3 V and 5 V systems
• Data storage in high-speed digital circuits
• Bus driver applications requiring tri-state control

Procurement Notes

Verify the specific package suffix matches the required form factor: AF indicates SOP-20, AFT indicates TSSOP-20, and AFK indicates VSSOP-20. Confirm RoHS compliance status directly with Toshiba Semiconductor and Storage as environmental declarations may vary by production batch. Ensure design accounts for absolute maximum ratings to prevent performance deterioration.

Selection Notes

Select this component when TTL-level input compatibility is required alongside high-speed latching functionality in a 5 V system. The VHCT series provides speed similar to LS/ALS logic but with lower static power consumption. Verify that the chosen package variant aligns with PCB footprint constraints and thermal management requirements for the target application environment.

Part Context

This part belongs to the TC74VHCT series of advanced high-speed CMOS logic devices. It functions as an octal transparent latch with 3-state outputs, controlled by separate Latch Enable (LE) and Output Enable (OE) signals. The device is pin-and-function compatible with various 74-series equivalents, facilitating straightforward upgrades or replacements in existing designs.

Replacement Considerations

Pin-compatible alternatives include other manufacturers' 74VHCT373 variants. Verify electrical parameters such as propagation delay and output drive strength against original specifications. Ensure replacement parts support the same 5 V supply voltage and operate within the required temperature range.