CD74HC251M Equivalent & Substitute Parts

Part Overview

The CD74HC251M is a 1 x 8:1 multiplexer logic integrated circuit manufactured by Texas Instruments 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 CD74HC251M operates from a single supply voltage of 2V to 6V with an operating temperature range of -55°C to 125°C, delivering 5.2mA output current at both high and low logic levels. ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1) support modern manufacturing requirements.

Key Parameters

Parameter	Value
Circuit Configuration	1 x 8:1 Multiplexer
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
Package Type	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Supply Configuration	Single Supply

Substitute Part Grouping Explanation

Substitution of the CD74HC251M is determined by strict equivalence across the following parameters: circuit configuration (1 x 8:1 multiplexer), output current specifications (5.2mA high and low), supply voltage range (2V to 6V), package type (16-SOIC), and mounting method (surface mount). All substitute parts listed maintain these core electrical and mechanical specifications. Packaging format (tube, bulk, tape & reel, or cut tape) and manufacturer differences do not affect functional compatibility. Product status and compliance certifications are secondary considerations that influence procurement suitability but do not alter electrical equivalence.

Parameter Comparison

Part Number	Manufacturer	Circuit	Output Current (mA)	Supply Voltage	Temp Range (°C)	Package	Product Status	RoHS Status
CD74HC251M	Texas Instruments	1 x 8:1	5.2 / 5.2	2V - 6V	-55 to 125	16-SOIC	Obsolete	ROHS3 Compliant
CD74HC251M96	Harris Corporation	1 x 8:1	5.2 / 5.2	2V - 6V	-55 to 125	16-SOIC	Obsolete	RoHS Non-compliant
CD74HC151M	Harris Corporation	1 x 8:1	5.2 / 5.2	2V - 6V	-55 to 125	16-SOIC	Obsolete	RoHS Non-compliant
MC74HC251ADR2G	onsemi	1 x 8:1	5.2 / 5.2	2V - 6V	-55 to 125	16-SOIC	Active	ROHS3 Compliant
74HC251D,653	Nexperia USA Inc.	1 x 8:1	5.2 / 5.2	2V - 6V	-40 to 125	16-SOIC	Active	ROHS3 Compliant
MC74HC251ADG	onsemi	1 x 8:1	5.2 / 5.2	2V - 6V	-55 to 125	16-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For ROHS3 Compliant Applications: MC74HC251ADR2G (onsemi, active status, tape & reel packaging), 74HC251D,653 (Nexperia USA Inc., active status, cut tape packaging), or MC74HC251ADG (onsemi, active status, tube packaging) are suitable selections. All three maintain full electrical equivalence to CD74HC251M while offering active product status and current compliance certifications.

For Extended Temperature Range (-55°C to 125°C): MC74HC251ADR2G, MC74HC251ADG, CD74HC251M, CD74HC151M, and CD74HC251M96 all support the full -55°C to 125°C operating range. The 74HC251D,653 operates from -40°C to 125°C, which is acceptable for applications not requiring the lower temperature extreme.

For Obsolete Part Replacement: MC74HC251ADR2G and MC74HC251ADG (onsemi) or 74HC251D,653 (Nexperia USA Inc.) are preferred due to active product status, ensuring long-term availability and manufacturing support.

For Packaging Flexibility: Substitute parts are available in tube (CD74HC251M, CD74HC151M, MC74HC251ADG), bulk (CD74HC251M96), tape & reel (MC74HC251ADR2G), and cut tape (74HC251D,653) formats to accommodate different procurement and assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can CD74HC251M be directly replaced with CD74HC151M? A: Yes. Both parts are parametrically equivalent 1 x 8:1 multiplexers with identical output current (5.2mA), supply voltage range (2V to 6V), operating temperature range (-55°C to 125°C), and 16-SOIC package specifications. The base product numbers differ (74HC251 vs. 74HC151), but electrical functionality is equivalent.

Q: What is the difference between MC74HC251ADR2G and MC74HC251ADG? A: Both are onsemi 1 x 8:1 multiplexers with identical electrical specifications. The primary difference is packaging: MC74HC251ADR2G is supplied in tape & reel format, while MC74HC251ADG is supplied in tube format. Selection depends on assembly process requirements.

Q: Is 74HC251D,653 compatible with CD74HC251M in all temperature applications? A: 74HC251D,653 operates from -40°C to 125°C, while CD74HC251M operates from -55°C to 125°C. For applications requiring operation below -40°C, CD74HC251M or other substitutes with -55°C minimum rating must be used. For applications within -40°C to 125°C, 74HC251D,653 is fully compatible.

Q: Why is RoHS compliance important for CD74HC251M substitution? A: RoHS3 compliance indicates adherence to current environmental and hazardous substance restrictions. MC74HC251ADR2G, 74HC251D,653, and MC74HC251ADG are ROHS3 compliant, supporting modern manufacturing and regulatory requirements. CD74HC251M96 is RoHS non-compliant and should be avoided for new designs subject to RoHS regulations.

Q: Can I use CD74HC251M96 as a substitute for CD74HC251M? A: Electrically, yes. CD74HC251M96 maintains identical circuit configuration, output current, supply voltage, and temperature specifications. However, CD74HC251M96 is RoHS non-compliant and obsolete, making it unsuitable for applications requiring current compliance certifications or long-term availability.

Q: What packaging should I select for high-volume surface mount assembly? A: MC74HC251ADR2G in tape & reel format is optimized for automated pick-and-place assembly. For lower volumes or manual assembly, tube packaging (MC74HC251ADG) or cut tape (74HC251D,653) are appropriate alternatives.

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