74HCT241D,653

Overview

The Nexperia 74HCT241D,653 is an octal buffer and line driver featuring three-state outputs, housed in a 20-lead SO plastic small outline package (SOT163-1). It operates within a supply voltage range of 4.5 V to 5.5 V. The device provides non-inverting logic with two independent output enable inputs: 1OE (active LOW) and 2OE (active HIGH). It complies with JEDEC JESD7A standards for the specified voltage range.

Feature Summary

• Features reduced input threshold levels specifically designed to allow direct interfacing with TTL logic levels.
• Provides high noise immunity and robust latch-up performance exceeding 100 mA per JESD 78 Class II Level B.
• Includes input clamp diodes to facilitate current limiting resistors when interfacing inputs to voltages exceeding VCC.

Applications

• Octal bus interface systems
• Carry propagation in wide arithmetic operations
• Driving bus lines requiring three-state control

Procurement Notes

Verify that the specific order code 74HCT241D,653 corresponds to the SO20 (SOT163-1) package variant. Confirm the HCT logic family designation is required for TTL compatibility rather than the HC series. Ensure the operating temperature range meets the application's thermal requirements.

Selection Notes

Select this component when TTL-level input compatibility is necessary alongside CMOS low power dissipation. The dual enable structure allows flexible partitioning of the eight buffers into two four-bit groups or one continuous eight-bit group based on system architecture needs.

Part Context

This part belongs to the 74HCT logic family, which bridges standard CMOS technology with Transistor-Transistor Logic (TTL) input specifications. It serves as a high-performance alternative to older bipolar logic families while maintaining backward compatibility with existing TTL-driven designs.

Replacement Considerations

The 74HC241D,653 is a compatible alternative if TTL input thresholds are not required. Verify pinout consistency across all potential substitute manufacturers before integration.

FAQ

How do the two output enable inputs function?

The device has two independent enables: 1OE is active LOW, controlling outputs 1Y0 through 1Y3, while 2OE is active HIGH, controlling outputs 2Y0 through 2Y3.

What is the purpose of the input clamp diodes?

The clamp diodes allow the use of current-limiting resistors to safely interface the inputs to voltages higher than the supply voltage (VCC).