MM74HC4051WMX Equivalent & Substitute Parts

Part Overview

The MM74HC4051WMX is an 8:1 multiplexer/demultiplexer interface IC manufactured by onsemi in a 16-SOIC surface mount package. This single-circuit switch device features 100Ohm on-state resistance and operates across 2V to 6V single supply or ±2V to 6V dual supply configurations. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Multiplexer/Demultiplexer Circuit Configuration	8:1
Number of Circuits	1
On-State Resistance (Max)	100Ohm
Channel-to-Channel Matching (ΔRon)	15Ohm
Voltage - Supply, Single (V+)	2V ~ 6V
Voltage - Supply, Dual (V±)	±2V ~ 6V
Switch Time (Ton, Toff) (Max)	41ns, 32ns
-3dB Bandwidth	35MHz
Channel Capacitance (CS(off), CD(off))	5pF, 90pF
Current - Leakage (IS(off)) (Max)	100nA
Crosstalk	-50dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC4051WMX is determined by the following core parameters:

Primary Compatibility Criteria:

Multiplexer/Demultiplexer circuit configuration: 8:1
Number of circuits: 1
On-state resistance: 100Ohm nominal
Supply voltage ranges: 2V ~ 6V (single) or ±2V ~ 6V (dual)
Package type: 16-SOIC surface mount

Secondary Compatibility Considerations:

Channel-to-channel matching (ΔRon): 15Ohm or better
Operating temperature range: minimum -40°C to 85°C
Leakage current: 100nA or lower
Crosstalk performance: -50dB @ 1MHz or better

Substitute parts are grouped into two categories based on product status and packaging format:

Category 1 - Active onsemi Parts (Recommended for New Designs): MC74HC4051ADWG and MC74HC4051ADWR2G meet all primary compatibility criteria with improved performance specifications and active product status.

Category 2 - Active Alternative Manufacturers: HEF4051BT,653 (Nexperia) and TC74HC4051AF(EL,F) (Toshiba) provide functional equivalence with trade-offs in specific parameters such as on-state resistance and supply voltage ranges.

Parameter Comparison

Parameter	MM74HC4051WMX	MC74HC4051ADWG	MC74HC4051ADWR2G	HEF4051BT,653	TC74HC4051AF(EL,F)
Manufacturer	onsemi	onsemi	onsemi	Nexperia USA Inc.	Toshiba Semiconductor and Storage
Product Status	Obsolete	Active	Active	Active	Active
Multiplexer/Demultiplexer Circuit	8:1	8:1	8:1	8:1	8:1
Number of Circuits	1	1	1	1	1
On-State Resistance (Max)	100Ohm	100Ohm	100Ohm	155Ohm	100Ohm
Channel-to-Channel Matching (ΔRon)	15Ohm	10Ohm	10Ohm	5Ohm	5Ohm
Voltage - Supply, Single (V+)	2V ~ 6V	2V ~ 6V	2V ~ 6V	3V ~ 15V	2V ~ 6V
Voltage - Supply, Dual (V±)	±2V ~ 6V	±2V ~ 6V	±2V ~ 6V	Not supported	±2V ~ 6V
-3dB Bandwidth	35MHz	80MHz	80MHz	70MHz	85MHz
Current - Leakage (IS(off)) (Max)	100nA	200nA	200nA	200nA	100nA
Crosstalk	-50dB @ 1MHz	Not specified	Not specified	-50dB @ 1MHz	-50dB @ 1MHz
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	16-SOIC (0.295", 7.50mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.295", 7.50mm)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.209", 5.30mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement in Active Production: MC74HC4051ADWR2G is the primary substitute for MM74HC4051WMX. Both parts are manufactured by onsemi, share identical electrical specifications for supply voltage and circuit configuration, and are available in the same 16-SOIC package footprint. MC74HC4051ADWR2G carries active product status with ROHS3 compliance and extended operating temperature range (-55°C ~ 125°C), providing superior long-term availability and regulatory compliance.

For Alternative Manufacturer Selection: TC74HC4051AF(EL,F) from Toshiba provides functional equivalence with matching on-state resistance (100Ohm), identical supply voltage ranges, and RoHS compliance. This part maintains the same operating temperature floor (-40°C) as the original MM74HC4051WMX and offers improved leakage current performance (100nA).

For Extended Supply Voltage Applications: HEF4051BT,653 from Nexperia supports extended single supply voltage range (3V ~ 15V) and offers superior channel-to-channel matching (5Ohm). However, this part does not support dual supply operation and features higher on-state resistance (155Ohm), making it suitable only for applications where these trade-offs are acceptable.

Compliance Considerations: All active substitute parts carry ROHS3 or RoHS compliance certification. MC74HC4051ADWG and MC74HC4051ADWR2G are identical parts differing only in packaging format (Tube vs. Tape & Reel), with MC74HC4051ADWR2G recommended for high-volume production due to standard reel packaging.

Frequently Asked Questions (FAQ)

Q: Can MC74HC4051ADWG and MC74HC4051ADWR2G be used interchangeably with MM74HC4051WMX? A: Yes. Both parts are electrically and mechanically compatible with MM74HC4051WMX. The difference between them is packaging format only: MC74HC4051ADWG ships in Tube packaging while MC74HC4051ADWR2G ships in Tape & Reel format. Both are manufactured by onsemi and meet all primary compatibility criteria.

Q: What is the impact of higher leakage current in MC74HC4051ADWG and MC74HC4051ADWR2G? A: These parts specify 200nA maximum leakage current compared to 100nA for MM74HC4051WMX. This doubling of leakage current is within acceptable limits for most multiplexer applications and does not affect functional compatibility. Applications with strict leakage requirements should consider TC74HC4051AF(EL,F) or HEF4051BT,653, which maintain 100nA or lower specifications.

Q: Why does HEF4051BT,653 have higher on-state resistance? A: HEF4051BT,653 specifies 155Ohm on-state resistance versus 100Ohm for MM74HC4051WMX. This difference reflects different semiconductor process technology between manufacturers. Applications sensitive to signal attenuation or requiring lower impedance paths should use parts with 100Ohm on-state resistance (MC74HC4051ADWG, MC74HC4051ADWR2G, or TC74HC4051AF(EL,F)).

Q: Is the package size difference between substitute parts significant? A: Package dimensions vary slightly: MM74HC4051WMX uses 16-SOIC (0.295", 7.50mm width), HEF4051BT,653 uses 16-SOIC (0.154", 3.90mm width), and TC74HC4051AF(EL,F) uses 16-SOIC (0.209", 5.30mm width). All are 16-pin SOIC surface mount packages with identical pin configurations. PCB layout compatibility depends on specific footprint design; verify footprint dimensions before substitution.

Q: Can I use HEF4051BT,653 in applications requiring dual supply voltage operation? A: No. HEF4051BT,653 supports only single supply voltage operation (3V ~ 15V) and does not support dual supply (V±) configuration. Applications requiring ±2V to ±6V dual supply operation must use MC74HC4051ADWG, MC74HC4051ADWR2G, or TC74HC4051AF(EL,F).

Q: What is the significance of the extended operating temperature range in MC74HC4051ADWG and MC74HC4051ADWR2G? A: These parts operate from -55°C to 125°C compared to -40°C to 85°C for MM74HC4051WMX. The extended range provides additional margin for industrial and automotive applications subject to wider temperature extremes. For standard commercial temperature range applications (-40°C to 85°C), this extended specification provides no functional advantage.

Q: Are all substitute parts REACH compliant? A: Yes. All substitute parts listed carry REACH Unaffected status, indicating compliance with REACH regulations. All parts also carry ROHS3 or RoHS compliance certification, meeting current environmental and hazardous substance restrictions.

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