CD74HC251MT Equivalent & Substitute Parts

Part Overview

The CD74HC251MT is a 1 x 8:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This part is designated as Last Time Buy, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD74HC251MT
Manufacturer	Texas Instruments
Type	Multiplexer
Circuit Configuration	1 x 8:1
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage Supply	2V ~ 6V
Current - Output High, Low	5.2mA, 5.2mA
Operating Temperature	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74HC251MT is determined by strict equivalence across the following critical parameters:

Circuit configuration: 1 x 8:1 multiplexer topology
Package type: 16-SOIC surface mount housing
Electrical specifications: 2V ~ 6V supply voltage, 5.2mA output current capability
Operating temperature range: -55°C ~ 125°C
RoHS and environmental compliance status

Substitute parts are grouped into two categories: parametric equivalents from alternative manufacturers and manufacturer-recommended alternatives. All listed substitutes maintain identical electrical performance and package compatibility with the CD74HC251MT.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Packaging	Voltage Supply	Operating Temperature	RoHS Status	Package / Case
CD74HC251MT	Texas Instruments	Last Time Buy	Tape & Reel (TR)	2V ~ 6V	-55°C ~ 125°C	ROHS3 Compliant	16-SOIC (0.154", 3.90mm Width)
CD74HC151M96	Texas Instruments	Active	Tape & Reel (TR)	2V ~ 6V	-55°C ~ 125°C	ROHS3 Compliant	16-SOIC (0.154", 3.90mm Width)
CD74HC151MT	Texas Instruments	Discontinued at DiGi Electronics	Tape & Reel (TR)	2V ~ 6V	-55°C ~ 125°C	ROHS3 Compliant	16-SOIC (0.154", 3.90mm Width)
CD74HC251M96	Harris Corporation	Obsolete	Bulk	2V ~ 6V	-55°C ~ 125°C	RoHS Non-Compliant	16-SOIC (0.154", 3.90mm Width)
74HC251D,653	Nexperia USA Inc.	Active	Cut Tape (CT) & Digi-Reel®	2V ~ 6V	-40°C ~ 125°C	ROHS3 Compliant	16-SOIC (0.154", 3.90mm Width)
MC74HC251ADG	onsemi	Active	Tube	2V ~ 6V	-55°C ~ 125°C	ROHS3 Compliant	16-SOIC (0.154", 3.90mm Width)
MC74HC251ADR2G	onsemi	Active	Tape & Reel (TR)	2V ~ 6V	-55°C ~ 125°C	ROHS3 Compliant	16-SOIC (0.154", 3.90mm Width)
NLV74HC251ADR2G	onsemi	Obsolete	Tape & Reel (TR)	2V ~ 6V	-55°C ~ 125°C	ROHS3 Compliant	16-SOIC (0.154", 3.90mm Width)

Engineering Selection Recommendations

For new designs and ongoing production, CD74HC151M96 (Texas Instruments, Active status) and MC74HC251ADR2G (onsemi, Active status, Tape & Reel packaging) are the primary recommended substitutes. Both parts maintain full electrical and mechanical compatibility with the CD74HC251MT while offering active product status and ROHS3 compliance.

The 74HC251D,653 from Nexperia USA Inc. is an active alternative with ROHS3 compliance. This part operates across a -40°C ~ 125°C temperature range, which is narrower at the lower bound compared to the CD74HC251MT (-55°C ~ 125°C). Selection of this part requires verification that the -40°C minimum operating temperature meets application requirements.

The MC74HC251ADG from onsemi is available in Tube packaging and maintains full specification alignment with the CD74HC251MT. This option is suitable for applications where Tube packaging is acceptable.

Parts designated as Obsolete or Discontinued (CD74HC251M96 from Harris Corporation, CD74HC151MT, NLV74HC251ADR2G) should be avoided for new designs due to limited availability and end-of-life status.

Frequently Asked Questions (FAQ)

Q: Can CD74HC151M96 directly replace CD74HC251MT?

A: Yes. CD74HC151M96 from Texas Instruments is a parametric equivalent with identical electrical specifications, operating temperature range (-55°C ~ 125°C), supply voltage (2V ~ 6V), output current (5.2mA), and 16-SOIC package. The part is in Active status with current availability.

Q: What is the difference between MC74HC251ADG and MC74HC251ADR2G?

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

Q: Is 74HC251D,653 from Nexperia a suitable substitute?

A: 74HC251D,653 is electrically equivalent with ROHS3 compliance and Active product status. The operating temperature range is -40°C ~ 125°C, which is narrower at the lower temperature limit compared to CD74HC251MT (-55°C ~ 125°C). This part is suitable only if the application does not require operation below -40°C.

Q: Why should obsolete parts be avoided?

A: Parts with Obsolete or Discontinued status have limited or no availability from distributors. Using these parts in new designs creates supply chain risk and may result in production delays or inability to source components for future builds.

Q: Are all substitute parts ROHS3 compliant?

A: No. CD74HC251M96 from Harris Corporation is RoHS non-compliant. All other listed substitutes are ROHS3 compliant. For applications requiring RoHS compliance, select only from ROHS3 compliant alternatives.

Q: Can the CD74HC251MT be used in applications requiring -55°C operation?

A: Yes. The CD74HC251MT operates across -55°C ~ 125°C. However, if substituting with 74HC251D,653 from Nexperia, the lower operating temperature limit is -40°C. Verify application temperature requirements before selecting this alternative.

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