74HC251D,652 Equivalent & Substitute Parts

Part Overview

The 74HC251D,652 is a 1 x 8:1 multiplexer logic integrated circuit manufactured by Nexperia USA Inc. in a 16-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 74HC251D,652 operates as a single-supply logic multiplexer with output current ratings of 5.2mA (high and low), supporting supply voltages from 2V to 6V across an operating temperature range of -40°C to 125°C. The part is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	Value
Part Number	74HC251D,652
Manufacturer	Nexperia USA Inc.
Type	Multiplexer 1 x 8:1
Package	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Current - Output High/Low	5.2mA / 5.2mA
Voltage Supply	2V ~ 6V
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 74HC251D,652 is determined by the following critical parameters:

Circuit configuration: 1 x 8:1 multiplexer topology
Package type: 16-SOIC surface mount form factor
Voltage supply range: 2V ~ 6V single supply operation
Output current capability: Minimum 5.2mA (high and low)
Mounting compatibility: Surface mount technology

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Substitutes maintain identical electrical specifications and package compatibility with the original part.

Upgrade Substitutes provide equivalent functionality with extended or improved specifications, though some may have different product status or compliance ratings.

Similar Substitutes share the same base circuit design and package but may have variations in output current ratings or operating temperature ranges that require application verification.

Parameter Comparison

Part Number	Manufacturer	Circuit	Package	Current High/Low (mA)	Voltage Supply	Temp Range (°C)	Product Status	RoHS Status
74HC251D,652	Nexperia USA Inc.	1 x 8:1	16-SOIC	5.2 / 5.2	2V ~ 6V	-40 ~ 125	Obsolete	ROHS3
MC74HC251ADR2G	onsemi	1 x 8:1	16-SOIC	5.2 / 5.2	2V ~ 6V	-55 ~ 125	Active	ROHS3
CD74HC251M96	Harris Corporation	1 x 8:1	16-SOIC	5.2 / 5.2	2V ~ 6V	-55 ~ 125	Obsolete	Non-compliant
CD74HC251MT	Texas Instruments	1 x 8:1	16-SOIC	5.2 / 5.2	2V ~ 6V	-55 ~ 125	Last Time Buy	ROHS3
MC74HC251ADG	onsemi	1 x 8:1	16-SOIC	5.2 / 5.2	2V ~ 6V	-55 ~ 125	Active	ROHS3
SN74HC251D	Texas Instruments	1 x 8:1	16-SOIC	7.8 / 7.8	2V ~ 6V	-40 ~ 85	Discontinued	ROHS3
SN74HC251DR	Texas Instruments	1 x 8:1	16-SOIC	7.8 / 7.8	2V ~ 6V	-40 ~ 85	Active	ROHS3
SN74HC251DT	Texas Instruments	1 x 8:1	16-SOIC	7.8 / 7.8	2V ~ 6V	-40 ~ 85	Discontinued	ROHS3

Engineering Selection Recommendations

For direct replacement with identical specifications:

MC74HC251ADR2G (onsemi) is the primary direct substitute. It maintains 5.2mA output current matching the original part, operates across the same 2V to 6V supply range, and holds active product status with ROHS3 compliance. The extended temperature range (-55°C to 125°C) provides additional operational margin.

For applications requiring extended temperature operation:

CD74HC251MT (Texas Instruments) provides equivalent 5.2mA output current with extended temperature range (-55°C to 125°C) and ROHS3 compliance. This part carries Last Time Buy status, indicating limited future availability.

For applications with higher output current requirements:

SN74HC251DR (Texas Instruments) offers increased output current (7.8mA high and low) with active product status and ROHS3 compliance. This part operates within a narrower temperature range (-40°C to 85°C) and is currently available.

For RoHS non-compliant applications:

CD74HC251M96 (Harris Corporation) maintains 5.2mA output current specifications but does not meet ROHS3 compliance requirements. This part is obsolete.

Frequently Asked Questions (FAQ)

Q: Can MC74HC251ADR2G directly replace the 74HC251D,652?

A: Yes. Both parts share identical output current ratings (5.2mA), voltage supply range (2V to 6V), and 16-SOIC package configuration. MC74HC251ADR2G has active product status and ROHS3 compliance, making it suitable for direct substitution.

Q: What is the difference between MC74HC251ADR2G and MC74HC251ADG?

A: Both parts are manufactured by onsemi with identical electrical specifications and 16-SOIC packaging. The primary difference is packaging format: MC74HC251ADR2G is supplied in Tape & Reel (TR), while MC74HC251ADG is supplied in Tube. Selection depends on procurement and assembly requirements.

Q: Why do SN74HC251DR and SN74HC251DT have higher output current ratings?

A: SN74HC251DR and SN74HC251DT are Texas Instruments variants with 7.8mA output current (high and low) compared to the 5.2mA specification of the original part. These parts operate within a narrower temperature range (-40°C to 85°C). Higher output current may require circuit verification for compatibility.

Q: Is CD74HC251MT suitable for new designs?

A: CD74HC251MT carries Last Time Buy status, indicating that Texas Instruments will discontinue this part. While currently available with ROHS3 compliance and equivalent specifications, it is not recommended for new long-term production designs. MC74HC251ADR2G is the preferred choice for ongoing applications.

Q: What packaging options are available for 74HC251 multiplexers?

A: Substitute parts are available in multiple packaging formats: Tape & Reel (TR) for automated assembly, Tube for manual handling, Cut Tape (CT) & Digi-Reel for flexible quantities, and Bulk for large-volume procurement. All maintain the 16-SOIC form factor.

Q: Are all substitute parts RoHS3 compliant?

A: No. CD74HC251M96 does not meet ROHS3 compliance. All other listed substitutes (MC74HC251ADR2G, CD74HC251MT, MC74HC251ADG, SN74HC251D, SN74HC251DR, SN74HC251DT) are ROHS3 compliant.

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