74HCT4511D,653

Overview

The 74HCT4511D,653 is a BCD to 7-segment latch/decoder/driver manufactured by Nexperia USA Inc. It features four address inputs (A, B, C, D), a latch enable input (LE), a ripple blanking input (BI), and a lamp test input (LT). The device provides seven segment outputs (a to g) for driving common cathode LED displays. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of -40°C to +125°C. The component is housed in a 16-SOIC package with surface mount installation.

Feature Summary

• Converts Binary-Coded Decimal inputs into seven-segment display signals
• Includes internal latching mechanism to store data when latch enable is high
• Provides dedicated control inputs for lamp testing and output blanking

Applications

• Driving common cathode LED numeric displays
• BCD to decimal decoding circuits
• Digital instrumentation readouts

Procurement Notes

Verify the specific suffix '653' against the manufacturer's current datasheet to confirm pinout compatibility and RoHS status. Ensure the design utilizes a 4.5V to 5.5V power supply, as this HCT variant requires higher voltage than standard HC logic. Confirm that the 16-SOIC package dimensions match the target PCB footprint before finalizing procurement orders.

Selection Notes

Select this component when a TTL-compatible BCD decoder with integrated latching is required for LED indicators. It is suitable for designs needing direct interface with microcontroller BCD outputs without external latch components. Consider the 74HC4511 if a wider 2.0V to 6.0V supply range or CMOS input levels are necessary instead of the HCT TTL levels.

Part Context

This part belongs to the 74HCT series of high-speed CMOS logic devices from Nexperia. It functions as a specialized decoder within the broader family of digital logic ICs designed for general-purpose computing and display interfacing applications. The device integrates decoding, latching, and driver capabilities into a single package.

Replacement Considerations

• 74HC4511D,653
• MC74HC4511ADWG

FAQ

How does the Latch Enable (LE) input function?

When LE is LOW, the segment outputs follow the data on inputs A to D. When LE goes HIGH, the last data present on the inputs is stored in the internal latches, keeping the segment outputs stable regardless of subsequent input changes.

What is the purpose of the Lamp Test (LT) input?

When the LT input is LOW, all segment outputs are forced HIGH, causing all segments of the connected LED display to illuminate simultaneously. This allows for verification of the display functionality independent of the data inputs.