SN74HC251DR

Overview

The SN74HC251DR is a data selector/multiplexer in the HC logic series, packaged in a 16-pin SOIC. It features full binary decoding to select one of eight data sources with strobe-controlled complementary 3-state outputs. The device operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -40 °C to +85 °C. Typical propagation delay is 9 ns at 5 V, with maximum input current of 1 μA and power consumption of 80 μA.

Feature Summary

• Provides full binary decoding for selecting one of eight data inputs
• Features strobe-controlled complementary 3-state outputs for bus interfacing
• Supports parallel-to-serial conversion functions

Applications

• Bus-oriented system data line driving
• Parallel-to-serial data conversion
• Data selection in digital logic circuits

Procurement Notes

Verify the specific package type (SOIC) and lead finish against project requirements. Confirm RoHS compliance status and moisture sensitivity level ratings prior to assembly. Ensure ordering suffixes match the desired carrier format and production status as listed in the manufacturer's orderable addendum.

Selection Notes

Select this component when a high-current 3-state output capable of driving up to 15 LSTTL loads is required. Consider the wide operating voltage range and low power consumption characteristics suitable for general-purpose digital applications requiring multiplexing functionality.

Part Context

This part belongs to the SNx4HC251 family, which includes various package options such as SSOP, PDIP, and TSSOP. The 'D' suffix indicates the SOIC package variant. The device serves as a 3-state version of the standard HC151 multiplexer, offering enhanced bus interface capabilities through its controlled outputs.

Replacement Considerations

SN74HC251DBR (SSOP package), SN74HC251N (PDIP package). Verify pinout compatibility and thermal performance differences between packages before substitution.