CD4051BCMTCX Equivalent & Substitute Parts

Part Overview

The CD4051BCMTCX is a single-circuit 8:1 analog multiplexer/demultiplexer IC manufactured by onsemi in 16-TSSOP surface mount packaging. This device features 240Ω maximum on-state resistance and operates across a wide supply voltage range of 5V to 15V (single supply) or ±2.5V to ±7.5V (dual supply). The product is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	CD4051BCMTCX
Multiplexer/Demultiplexer Circuit	8:1
Number of Circuits	1
On-State Resistance (Max)	240Ω
Channel-to-Channel Matching (ΔRon)	5Ω
Voltage - Supply, Single (V+)	5V ~ 15V
Voltage - Supply, Dual (V±)	±2.5V ~ 7.5V
Switch Time (Ton, Toff) (Max)	320ns, 150ns
-3dB Bandwidth	40MHz
Current - Leakage (IS(off)) (Max)	50nA
Crosstalk	-40dB @ 3MHz
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	16-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD4051BCMTCX is determined by the following critical parameters:

Functional Requirements:

8:1 multiplexer/demultiplexer configuration
Single circuit topology
16-TSSOP package with identical 0.173" × 4.40mm dimensions
Surface mount compatibility

Electrical Compatibility Criteria:

On-state resistance range acceptable for application (240Ω baseline; lower values provide improved performance)
Supply voltage compatibility (single or dual supply modes)
Operating temperature range (-55°C to 125°C minimum)
Leakage current specifications
Bandwidth and switching characteristics

Substitute parts are grouped into three categories based on on-state resistance and supply voltage characteristics: CMOS standard logic (100Ω–120Ω range with 2V–10V supply), low-voltage extended (26Ω with 2.5V–6V supply), and high-speed variants (120Ω with enhanced bandwidth).

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	Voltage - Supply, Single (V+)	Voltage - Supply, Dual (V±)	-3dB Bandwidth	Current - Leakage (IS(off)) (Max)	Operating Temperature	Product Status	Package
CD4051BCMTCX	onsemi	240Ω	5V ~ 15V	±2.5V ~ 7.5V	40MHz	50nA	-55°C ~ 125°C	Obsolete	16-TSSOP
MC74HC4051ADTG	onsemi	100Ω	2V ~ 6V	±2V ~ 6V	80MHz	200nA	-55°C ~ 125°C	Active	16-TSSOP
MC74HC4051ADTR2G	onsemi	100Ω	2V ~ 6V	±2V ~ 6V	80MHz	200nA	-55°C ~ 125°C	Active	16-TSSOP
MC74HCT4051ADTG	onsemi	100Ω	2V ~ 6V	±2V ~ 6V	80MHz	200nA	-55°C ~ 125°C	Obsolete	16-TSSOP
MC74LVX4051DTG	onsemi	26Ω	2.5V ~ 6V	±2.5V ~ 6V	80MHz	100nA	-55°C ~ 125°C	Active	16-TSSOP
MC74LVX4051DTR2G	onsemi	26Ω	2.5V ~ 6V	±2.5V ~ 6V	80MHz	100nA	-55°C ~ 125°C	Active	16-TSSOP
MC74LVXT4051DTRG	onsemi	26Ω	2.5V ~ 6V	±2.5V ~ 6V	80MHz	100nA	-55°C ~ 125°C	Active	16-TSSOP
MC74VHC4051DTR2G	onsemi	100Ω	2V ~ 6V	±2V ~ 6V	80MHz	100nA	-55°C ~ 125°C	Active	16-TSSOP
74HC4051PW,112	Nexperia USA Inc.	120Ω	2V ~ 10V	±1.5V ~ 5V	180MHz	400nA	-40°C ~ 125°C	Obsolete	16-TSSOP
74HC4051PW,118	Nexperia USA Inc.	120Ω	2V ~ 10V	±1.5V ~ 5V	180MHz	400nA	-40°C ~ 125°C	Active	16-TSSOP
74HCT4051PW,118	Nexperia USA Inc.	120Ω	4.5V ~ 5.5V	±1V ~ 5V	180MHz	400nA	-40°C ~ 125°C	Active	16-TSSOP

Engineering Selection Recommendations

For Active Product Status Requirement: Select from MC74HC4051ADTR2G, MC74LVX4051DTG, MC74LVX4051DTR2G, MC74LVXT4051DTRG, MC74VHC4051DTR2G, 74HC4051PW,118, or 74HCT4051PW,118. These parts maintain current production status and full manufacturer support.

For Supply Voltage Compatibility:

If 5V–15V single supply is required: 74HC4051PW,118 or 74HCT4051PW,118 (2V–10V range covers this requirement)
If ±2.5V–±7.5V dual supply is required: MC74HC4051ADTR2G or MC74VHC4051DTR2G (±2V–±6V range is compatible)
If lower supply voltages (2.5V–6V) are acceptable: MC74LVX4051DTG, MC74LVX4051DTR2G, or MC74LVXT4051DTRG

For RoHS Compliance: All substitute parts listed carry ROHS3 Compliant certification. The original CD4051BCMTCX does not specify RoHS status.

For Moisture Sensitivity: All parts maintain MSL 1 (Unlimited) rating, ensuring equivalent handling and storage requirements.

For Operating Temperature: All substitute parts support -55°C to 125°C range except 74HC4051PW,112, 74HC4051PW,118, and 74HCT4051PW,118, which operate to -40°C minimum.

Frequently Asked Questions (FAQ)

Q: Can MC74HC4051ADTR2G directly replace CD4051BCMTCX? A: Yes, for applications operating within 2V–6V supply range. The MC74HC4051ADTR2G provides lower on-state resistance (100Ω vs. 240Ω), higher bandwidth (80MHz vs. 40MHz), and active product status. Verify your circuit's supply voltage compatibility before substitution.

Q: What is the difference between MC74LVX4051DTG and MC74HC4051ADTR2G? A: MC74LVX4051DTG operates at lower supply voltages (2.5V–6V) with significantly lower on-state resistance (26Ω vs. 100Ω) and leakage current (100nA vs. 200nA). MC74HC4051ADTR2G supports slightly higher supply voltages (2V–6V) with moderate on-state resistance. Select based on your circuit's voltage requirements and impedance specifications.

Q: Why do 74HC4051PW,118 and 74HCT4051PW,118 have different supply voltage ranges? A: 74HC4051PW,118 is a standard CMOS logic device supporting 2V–10V single supply. 74HCT4051PW,118 is a TTL-compatible variant restricted to 4.5V–5.5V single supply for TTL interface compatibility. Use 74HCT4051PW,118 only in TTL-level systems.

Q: Is packaging identical across all substitute parts? A: Yes. All substitute parts use 16-TSSOP surface mount packaging with 0.173" × 4.40mm dimensions, ensuring PCB footprint compatibility with CD4051BCMTCX.

Q: Which substitute offers the best performance improvement? A: MC74LVX4051DTG and MC74LVXT4051DTRG provide the lowest on-state resistance (26Ω), lowest leakage current (100nA), and lowest charge injection (12pC), delivering superior signal integrity and reduced power consumption compared to the original CD4051BCMTCX.

Q: Are all substitutes RoHS compliant? A: All listed substitute parts carry ROHS3 Compliant certification. The original CD4051BCMTCX does not specify RoHS status.

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