74HC251N,652 Equivalent & Substitute Parts

Part Overview

The 74HC251N,652 is a 1 x 8:1 multiplexer logic integrated circuit manufactured by NXP USA Inc. in a 16-DIP through-hole package. This component functions as a data selector, routing one of eight input signals to a single output based on address inputs. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

Substiute Parts

74HC251N,652

NXP USA Inc.In Stock: 88474HC251N,652 Datasheet

Current PartRFQ

CD74HC251E

Harris CorporationIn Stock: 31561CD74HC251E Datasheet

UpgradeRFQ

SN74HC251AN

Texas InstrumentsIn Stock: 1033SN74HC251AN Datasheet

MFR RecommendedRFQ

SN74HC251N

Texas InstrumentsIn Stock: 2222SN74HC251N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HC251N,652 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

• Circuit configuration: 1 x 8:1 multiplexer topology
• Package type: 16-DIP (0.300", 7.62mm) through-hole mounting
• Voltage supply range: 2V ~ 6V single supply operation
• Logic family: 74HC series
• Mounting method: Through-hole

All substitute parts listed maintain these core parameters. Variations in output current ratings, operating temperature ranges, and product status are noted but do not prevent functional substitution within the specified electrical operating window.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the 74HC251N,652:

Primary substitutes (Active product status): SN74HC251N and SN74HC251AN from Texas Instruments are recommended as primary alternatives. Both parts maintain the 16-DIP package, 2V ~ 6V supply range, and 1 x 8:1 multiplexer configuration. Both are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability.

Secondary substitute (Obsolete status): CD74HC251E from Harris Corporation provides functional equivalence with identical output current specifications (5.2mA). However, this part is obsolete and RoHS non-compliant, making it suitable only for legacy system maintenance or applications where RoHS compliance is not required.

Output current consideration: Texas Instruments parts (SN74HC251N and SN74HC251AN) provide higher output current (7.8mA versus 5.2mA), which may benefit applications requiring increased drive capability within the same voltage and package constraints.

Temperature range consideration: The CD74HC251E supports an extended lower operating temperature limit (-55°C versus -40°C), which may be relevant for industrial or aerospace applications requiring broader temperature coverage.

Frequently Asked Questions (FAQ)

Q: Can SN74HC251N directly replace 74HC251N,652 in existing designs?

A: Yes. Both parts share the 16-DIP package, 2V ~ 6V supply voltage, 1 x 8:1 multiplexer configuration, and through-hole mounting. Pin-to-pin compatibility is maintained. The higher output current (7.8mA versus 5.2mA) in the Texas Instruments part is not a limitation and may improve performance in current-limited applications.

Q: What is the difference between SN74HC251N and SN74HC251AN?

A: Both are Texas Instruments 1 x 8:1 multiplexers in 16-DIP packages with identical electrical specifications. SN74HC251AN is designated as a prototype part, while SN74HC251N is the standard production part. For new designs, SN74HC251N is the appropriate selection.

Q: Is CD74HC251E suitable for new designs?

A: CD74HC251E is classified as obsolete and RoHS non-compliant. It is suitable only for replacement in existing legacy systems or applications where RoHS compliance is not mandated. For new designs, Texas Instruments parts are recommended.

Q: Does the higher output current of Texas Instruments parts affect circuit design?

A: No negative impact. The 7.8mA output current of SN74HC251N and SN74HC251AN is higher than the 5.2mA of the original part, providing greater drive capability. Existing designs will operate within specification. Applications requiring specific current limiting should verify compatibility with datasheets.

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts are available in 16-DIP through-hole packages. Packaging variations (tube, tray) may differ by supplier and manufacturer, but the physical package dimensions and pin configuration remain identical across all listed substitutes.