SN74HC251PW

Overview

The SN74HC251PW is a data selector/multiplexer featuring full binary decoding to select one of eight data sources. It provides strobe-controlled complementary three-state outputs for direct system bus interfacing. The device operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range of -40°C to 85°C. Key electrical characteristics include a maximum input current of 1 μA, typical propagation delay of 9 ns at 5 V with 50 pF load, and output drive capability of ±6 mA at 5 V.

Feature Summary

• Features full binary decoding to select one of eight data inputs
• Provides complementary true and inverted three-state outputs controlled by a strobe signal
• Interfaces directly with system buses or drives up to 15 LSTTL loads
• Performs parallel-to-serial conversion functions

Applications

• Bus-oriented systems requiring data routing
• Parallel-to-serial data conversion circuits
• Data selection in digital logic architectures

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest package option addendum to confirm production status and material specifications. The PW (TSSOP) variant may have different availability compared to tape-and-reel versions like PWR. Confirm RoHS compliance and moisture sensitivity level ratings prior to procurement to ensure compatibility with assembly processes.

Selection Notes

Select this component when a single-ended 8-to-1 multiplexer with high-impedance outputs is required. Ensure the design accommodates the specified 2 V to 6 V supply range and that the TSSOP-16 package dimensions fit the board layout constraints. Verify that the input transition rise/fall times remain within limits for the chosen operating voltage to maintain signal integrity.

Part Context

This device belongs to the SNx4HC251 family of data selectors/multiplexers manufactured by Texas Instruments. It serves as the three-state output version of the SN74HC151. The family utilizes silicon gate CMOS technology to achieve low power consumption while maintaining high-speed performance suitable for general-purpose digital applications.

Replacement Considerations

SN74HC251PWR is the active tape-and-reel equivalent of the obsolete SN74HC251PW tube version. Other compatible variants include SN74HC251DR and SN74HC251DBR.