SN74S85D

Overview

The SN74S85D is a 4-bit binary or BCD magnitude comparator manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features active high outputs. The device is housed in a 16-pin SOIC package with surface mount installation. Propagation delays are specified at 10 ns, while the maximum operating temperature reaches +85 °C. This component supports logic functions for A < B, A = B, and A > B comparisons.

Feature Summary

• Performs 4-bit binary or BCD magnitude comparison
• Provides active high output signals
• Supports cascading for extended bit-width operations

Applications

• Digital arithmetic logic units
• Address decoding systems
• Data validation circuits

Procurement Notes

Verify the specific suffix 'D' confirms the SOIC-16 surface-mount package variant. Confirm RoHS compliance status through official manufacturer documentation. Ensure the operating environment remains within the specified -40 °C to +85 °C temperature range. Validate pinout compatibility with existing PCB footprints before integration.

Selection Notes

Select this component when surface-mount packaging is required for 4-bit magnitude comparison tasks. The SN74S85D offers faster switching speeds compared to standard LS series alternatives. Consider the SOIC-16 footprint constraints during layout design. Verify power supply stability within the 4.5 V to 5.5 V operational window.

Part Context

This part belongs to the Texas Instruments SN74S series, which utilizes Schottky diode technology for enhanced speed performance. The SN74S85D serves as the surface-mount equivalent to through-hole variants like the SN74S85N. It provides reliable digital comparison capabilities for industrial and commercial applications requiring compact form factors.

Replacement Considerations

The SN74S85N is a verified through-hole replacement offering identical logical functionality. Both parts share the same SN74S series specifications and pin configurations.