CD74HC4051MDREP Equivalent & Substitute Parts

Part Overview

The CD74HC4051MDREP is a single-circuit 8:1 multiplexer/demultiplexer IC manufactured by Texas Instruments in 16-SOIC surface mount packaging. This component functions as an analog switch with 130Ohm maximum on-state resistance and operates across a wide supply voltage range of 2V to 6V (single supply) or ±1V to ±5V (dual supply). The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Multiplexer/Demultiplexer Circuit Configuration	8:1
Number of Circuits	1
On-State Resistance (Max)	130Ohm
Channel-to-Channel Matching (ΔRon)	5Ohm
Voltage - Supply, Single (V+)	2V ~ 6V
Voltage - Supply, Dual (V±)	±1V ~ 5V
-3dB Bandwidth	180MHz
Channel Capacitance (CS(off), CD(off))	25pF
Current - Leakage (IS(off)) (Max)	400nA
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	16-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CD74HC4051MDREP is determined by the following critical parameters:

Functional Requirements:

8:1 multiplexer/demultiplexer configuration (mandatory)
Single-circuit topology (mandatory)
16-SOIC package form factor (mandatory for PCB compatibility)

Electrical Compatibility:

On-state resistance range: 26Ohm to 130Ohm (lower resistance provides improved performance)
Supply voltage overlap with 2V ~ 6V single supply range
Operating temperature range: -55°C ~ 125°C minimum
-3dB bandwidth: 80MHz or higher

Compliance & Status:

RoHS3 compliance (required)
MSL Level 1 (required)
Active or obsolete product status (both acceptable for substitution)

Substitute parts are grouped by on-state resistance characteristics, which directly affects signal integrity and power consumption in switching applications.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	ΔRon (Max)	V+ Range	V± Range	-3dB Bandwidth	IS(off) (Max)	Operating Temp	Product Status	Package
CD74HC4051MDREP	Texas Instruments	130Ohm	5Ohm	2V ~ 6V	±1V ~ 5V	180MHz	400nA	-55°C ~ 125°C	Obsolete	16-SOIC
74HCT4051D-Q100,11	Nexperia USA Inc.	120Ohm	6Ohm	4.5V ~ 5.5V	±1V ~ 5V	180MHz	400nA	-40°C ~ 125°C	Active	16-SOIC
74LV4051D,118	Nexperia USA Inc.	85Ohm	2Ohm	1V ~ 6V	—	200MHz	2µA	-40°C ~ 125°C	Active	16-SOIC
MC74HCT4051ADG	onsemi	100Ohm	10Ohm	2V ~ 6V	±2V ~ 6V	80MHz	200nA	-55°C ~ 125°C	Active	16-SOIC
MC74HCT4051ADR2G	onsemi	100Ohm	10Ohm	2V ~ 6V	±2V ~ 6V	80MHz	200nA	-55°C ~ 125°C	Active	16-SOIC
MC74LVX4051DG	onsemi	26Ohm	10Ohm	2.5V ~ 6V	±2.5V ~ 6V	80MHz	100nA	-55°C ~ 125°C	Active	16-SOIC
MC74LVX4051DR2G	onsemi	26Ohm	10Ohm	2.5V ~ 6V	±2.5V ~ 6V	80MHz	100nA	-55°C ~ 125°C	Active	16-SOIC
MC74LVXT4051DR2G	onsemi	26Ohm	10Ohm	2.5V ~ 6V	±2.5V ~ 6V	80MHz	100nA	-55°C ~ 125°C	Active	16-SOIC
MC74VHC4051DR2G	onsemi	100Ohm	10Ohm	2V ~ 6V	±2V ~ 6V	80MHz	100nA	-55°C ~ 125°C	Active	16-SOIC
NLV74HC4051ADR2G	onsemi	100Ohm	10Ohm	2V ~ 6V	±2V ~ 6V	80MHz	200nA	-55°C ~ 125°C	Obsolete	16-SOIC
NLV74VHC4051DR2G	onsemi	100Ohm	10Ohm	2V ~ 6V	±2V ~ 6V	80MHz	100nA	-55°C ~ 125°C	Obsolete	16-SOIC

Engineering Selection Recommendations

For Direct Replacement (Minimum Design Changes):

Select MC74HCT4051ADR2G or MC74HCT4051ADG from onsemi. These parts maintain the 100Ohm on-state resistance specification, full temperature range compatibility (-55°C ~ 125°C), and dual supply voltage support (±2V ~ 6V). Both are active products with RoHS3 compliance and MSL Level 1 rating. The ADR2G variant is packaged in Tape & Reel format with higher inventory availability (18,443 units).

For Improved Performance (Lower On-State Resistance):

Select MC74LVX4051DR2G or MC74LVXT4051DR2G from onsemi. These parts offer 26Ohm on-state resistance, reducing signal attenuation and power dissipation. Both maintain the full operating temperature range and are active products. Supply voltage range is 2.5V ~ 6V (single) or ±2.5V ~ 6V (dual), which covers the original 2V ~ 6V specification with a 0.5V minimum offset. The DR2G packaging provides Tape & Reel format.

For TTL-Compatible Applications:

Select 74HCT4051D-Q100,11 from Nexperia USA Inc. This part is AEC-Q100 qualified for automotive applications and maintains 120Ohm on-state resistance. Supply voltage is restricted to 4.5V ~ 5.5V (single supply), suitable for TTL-level logic systems. Operating temperature range is -40°C ~ 125°C.

For Extended Supply Voltage Range:

Select 74LV4051D,118 from Nexperia USA Inc. This part supports 1V ~ 6V single supply operation with 85Ohm on-state resistance and 200MHz bandwidth. Operating temperature is -40°C ~ 125°C. Leakage current is elevated at 2µA maximum.

All recommended substitutes are RoHS3 compliant with MSL Level 1 rating and maintain the 16-SOIC package form factor.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower on-state resistance than the original CD74HC4051MDREP?

A: Yes. Lower on-state resistance (26Ohm vs. 130Ohm) improves signal integrity and reduces power dissipation. Parts such as MC74LVX4051DR2G and MC74LVXT4051DR2G are direct functional replacements with superior performance characteristics. Verify that your circuit's supply voltage range (2.5V ~ 6V minimum) accommodates the substitute part's specifications.

Q: What is the difference between the MC74HCT4051ADR2G and MC74HCT4051ADG variants?

A: Both parts are electrically identical with 100Ohm on-state resistance and identical electrical specifications. The primary difference is packaging: ADR2G is supplied in Tape & Reel (TR) format for automated assembly, while ADG is supplied in Tube format for manual handling. ADR2G has significantly higher inventory availability (18,443 units vs. 3,578 units).

Q: Is the NLV74HC4051ADR2G suitable as a substitute despite being obsolete?

A: The NLV74HC4051ADR2G is electrically compatible and maintains full specifications including -55°C ~ 125°C operating temperature and AEC-Q100 automotive qualification. However, as an obsolete product, long-term procurement may be limited. Active alternatives such as MC74HCT4051ADR2G or MC74VHC4051DR2G are preferred for new designs.

Q: Can I substitute the CD74HC4051MDREP in a circuit designed for ±1V ~ ±5V dual supply operation?

A: Yes, with voltage range verification. The original part supports ±1V ~ ±5V dual supply. Substitute parts such as MC74HCT4051ADR2G support ±2V ~ ±6V, which overlaps the original range above ±2V. For applications requiring operation below ±2V, select 74HCT4051D-Q100,11 (±1V ~ ±5V) or 74LV4051D,118 (single supply only, no dual supply support).

Q: Does package width affect PCB layout compatibility?

A: The CD74HC4051MDREP uses 16-SOIC with 0.154" (3.90mm) width. Most substitute parts maintain this identical package dimension. However, MC74HCT4051ADG uses 16-SOIC with 0.295" (7.50mm) width. Verify PCB footprint compatibility before selecting this variant. All other recommended substitutes use the standard 0.154" width.

Q: What is the significance of the -3dB bandwidth specification in selecting a substitute?

A: The -3dB bandwidth indicates the frequency range over which the multiplexer maintains signal integrity. The original CD74HC4051MDREP specifies 180MHz. Substitute parts range from 80MHz to 200MHz. For applications operating below 80MHz, any substitute is acceptable. For high-frequency analog signal switching above 80MHz, select 74LV4051D,118 (200MHz) or the original specification (180MHz).

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