CD74HC151M Equivalent & Substitute Parts

Part Overview

The CD74HC151M is a 1 x 8:1 multiplexer logic IC manufactured by Texas Instruments in a 16-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The CD74HC151M operates as a data selector, routing one of eight input lines to a single output based on three select lines, with applications in signal routing, data acquisition, and logic circuit design.

Key Parameters

Parameter	Value
Type	Multiplexer / Data Selector
Circuit Configuration	1 x 8:1
Independent Circuits	1
Output Current (High/Low)	5.2mA / 5.2mA
Supply Voltage Range	2V to 6V
Operating Temperature Range	-55°C to 125°C
Mounting Type	Surface Mount
Package	16-SOIC (0.154", 3.90mm Width)
Series	74HC
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD74HC151M is determined by strict equivalence across the following critical parameters: circuit configuration (1 x 8:1), output current specifications (5.2mA/5.2mA), supply voltage range (2V–6V), operating temperature range, package type (16-SOIC), and RoHS compliance status. Substitute parts are grouped into two categories:

Direct Substitutes (Same Base Product Number 74HC151): Parts that maintain identical electrical specifications and package footprint, differing only in packaging format (Tube vs. Tape & Reel) or manufacturer. These include CD74HC151M96, MC74HC151ADR2G, 74HC151D,653, and 74HC151D-Q100,118.

Parametric Equivalents (Alternative Base Product Numbers): Parts with identical electrical performance and package specifications but different base product designations. These include CD74HC251M and MC74HC251ADG, which function as 1 x 8:1 multiplexers with matching electrical parameters.

Parameter Comparison

Part Number	Manufacturer	Circuit	Output Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status	RoHS
CD74HC151M	Texas Instruments	1 x 8:1	5.2 / 5.2	2V–6V	-55 to 125	16-SOIC	Discontinued	ROHS3
CD74HC151M96	Texas Instruments	1 x 8:1	5.2 / 5.2	2V–6V	-55 to 125	16-SOIC	Active	ROHS3
MC74HC151ADR2G	onsemi	1 x 8:1	5.2 / 5.2	2V–6V	-55 to 125	16-SOIC	Active	ROHS3
74HC151D,653	Nexperia USA Inc.	1 x 8:1	5.2 / 5.2	2V–6V	-40 to 125	16-SOIC	Active	ROHS3
74HC151D-Q100,118	Nexperia USA Inc.	1 x 8:1	5.2 / 5.2	2V–6V	-40 to 125	16-SOIC	Active	ROHS3
CD74HC251M	Harris Corporation	1 x 8:1	5.2 / 5.2	2V–6V	-55 to 125	16-SOIC	Obsolete	Non-compliant
MC74HC251ADG	onsemi	1 x 8:1	5.2 / 5.2	2V–6V	-55 to 125	16-SOIC	Active	ROHS3

Engineering Selection Recommendations

For direct replacement of the discontinued CD74HC151M, CD74HC151M96 (Texas Instruments, Active status) is the primary choice, maintaining identical specifications with improved availability in Tape & Reel packaging.

MC74HC151ADR2G (onsemi, Active status) and 74HC151D,653 (Nexperia USA Inc., Active status) are functionally equivalent alternatives with full ROHS3 compliance and active product status. The Nexperia parts offer extended inventory availability.

74HC151D-Q100,118 (Nexperia USA Inc., Active status) is suitable for automotive applications requiring AEC-Q100 qualification, with identical electrical performance and active status.

MC74HC251ADG (onsemi, Active status) and CD74HC251M (Harris Corporation, Obsolete status) are parametric equivalents with matching electrical specifications. MC74HC251ADG is preferred due to active product status and ROHS3 compliance. CD74HC251M should be avoided due to obsolete status and RoHS non-compliance.

All recommended substitutes maintain the 16-SOIC package footprint, enabling direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can CD74HC151M96 replace CD74HC151M directly on the PCB? A: Yes. CD74HC151M96 is electrically and mechanically identical to CD74HC151M, differing only in packaging format (Tape & Reel vs. Tube). Both use the 16-SOIC package with identical pinout and electrical specifications.

Q: What is the difference between 74HC151 and 74HC251 multiplexers? A: Both are 1 x 8:1 multiplexers with identical electrical specifications and package dimensions. The base product number difference reflects alternative manufacturer designations. Electrical performance, output current, supply voltage, and temperature range are equivalent.

Q: Are the Nexperia 74HC151D,653 and 74HC151D-Q100,118 interchangeable? A: Yes, electrically and mechanically. The primary difference is that 74HC151D-Q100,118 carries AEC-Q100 automotive qualification. Both maintain identical 1 x 8:1 circuit configuration, output current, supply voltage, and operating temperature range (-40°C to 125°C).

Q: Why is CD74HC251M listed as a substitute if it is obsolete? A: CD74HC251M is a parametric equivalent with matching electrical specifications and package. However, its obsolete status and RoHS non-compliance make it unsuitable for new designs. Active alternatives such as MC74HC251ADG are recommended.

Q: Does operating temperature range affect substitution compatibility? A: The CD74HC151M operates from -55°C to 125°C. Nexperia parts (74HC151D,653 and 74HC151D-Q100,118) operate from -40°C to 125°C. For applications requiring full -55°C operation, use CD74HC151M96, MC74HC151ADR2G, MC74HC251ADG, or CD74HC251M. For standard industrial applications (-40°C to 125°C), all listed substitutes are suitable.

Q: Are all substitute parts ROHS3 compliant? A: All active substitutes (CD74HC151M96, MC74HC151ADR2G, 74HC151D,653, 74HC151D-Q100,118, and MC74HC251ADG) are ROHS3 compliant. CD74HC251M is RoHS non-compliant and should not be used in applications requiring RoHS certification.

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