SN74LS47D

Overview

The SN74LS47D is a BCD-to-seven-segment decoder and driver manufactured by Texas Instruments. It belongs to the LS logic series and features a SOIC-Narrow-16 surface-mount package. The device operates within a supply voltage range of 4.75 V to 5.25 V, with a typical operating voltage of 5 V. Key electrical parameters include a maximum propagation delay of 56 ns, a low-level output current of 8 mA, and a high-level output current of -400 uA. The component supports an operating temperature range from 0°C to +70°C and contains two elements per chip.

Feature Summary

• Converts four-bit binary-coded decimal inputs into seven-segment display signals
• Designed specifically for driving common-anode displays with low-level active outputs
• Includes dedicated control pins for lamp testing, blanking, and leading zero suppression

Applications

• Driving common-anode seven-segment LED displays in digital systems
• Decoding binary data for numeric readout interfaces
• Integration with counter circuits for time or event display modules

Procurement Notes

Verify that the specific order matches the SN74LS47D part number and the SOIC-16 package configuration. Confirm compatibility with common-anode display requirements due to the low-level active output structure. Ensure the application environment remains within the specified 0°C to +70°C temperature limits and the 4.75 V to 5.25 V power supply range for reliable operation.

Selection Notes

Select this component when a TTL-compatible BCD decoder is required for direct segment drive applications. The LS series offers standard switching speeds suitable for general-purpose digital counting and display tasks. Consider the surface-mount packaging for automated assembly processes and space-constrained board layouts compared to through-hole alternatives.

Part Context

This device is part of the Texas Instruments SN74LS family, which provides standard logic functions using Low-power Schottky technology. The SN74LS47D specifically addresses the need for decoding binary information into human-readable formats. It complements other logic components like counters and registers in sequential circuit designs.

Replacement Considerations

Public confirmed substitute part numbers include SN74LS47DR and SN74LS47DE4.