CD4066BCMX Equivalent & Substitute Parts

Part Overview

The CD4066BCMX is a quad bilateral switch IC manufactured by onsemi, classified as an Interface component in the 4000B logic series. This device functions as a 4-circuit SPST (Single Pole Single Throw) switch with a 1:1 multiplexer/demultiplexer configuration, featuring a maximum on-state resistance of 240Ohm and operating across a supply voltage range of 3V to 18V. The part is currently listed as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD4066BCMX
Manufacturer	onsemi
Category	Interface
Package / Case	14-SOIC (0.154", 3.90mm Width)
Series	4000B
Switch Circuit	SPST
Number of Circuits	4
On-State Resistance (Max)	240Ohm
Channel-to-Channel Matching (ΔRon)	5Ohm
Voltage - Supply, Single (V+)	3V ~ 18V
-3db Bandwidth	40MHz
Channel Capacitance (CS(off), CD(off))	8pF
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the CD4066BCMX is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Package / Case: 14-SOIC (0.154", 3.90mm Width) — mandatory for PCB compatibility
Number of Circuits: 4 — functional requirement
Multiplexer/Demultiplexer Circuit: 1:1 — circuit topology requirement
Operating Temperature Range: Must encompass or match -55°C ~ 125°C
Voltage Supply Range: Must support 3V ~ 18V operation or be compatible within application constraints
Mounting Type: Surface Mount — assembly compatibility

Secondary Compatibility Parameters:

On-State Resistance (Max): 240Ohm baseline; lower resistance values (70Ohm, 20Ohm) are acceptable for applications requiring reduced signal loss
Channel-to-Channel Matching (ΔRon): Tighter matching (5Ohm) preferred; higher values acceptable if application tolerates resistance variation
-3db Bandwidth: 40MHz baseline; higher bandwidth values (160MHz) provide enhanced performance margin
Channel Capacitance: 8pF baseline; values up to 10pF acceptable for most applications

Substitute parts are grouped into three categories based on on-state resistance performance: 240Ohm direct equivalents, 70Ohm high-performance variants, and 20Ohm ultra-low-resistance variants.

Parameter Comparison

Part Number	Manufacturer	Package	On-State Resistance (Max)	ΔRon	Voltage Supply (V+)	Bandwidth (-3db)	Operating Temp	Product Status
CD4066BCMX	onsemi	14-SOIC	240Ohm	5Ohm	3V ~ 18V	40MHz	-55°C ~ 125°C	Obsolete
CD4066BM96	Texas Instruments	14-SOIC	240Ohm	5Ohm	3V ~ 18V	40MHz	-55°C ~ 125°C	Active
CD4066BM	Texas Instruments	14-SOIC	240Ohm	5Ohm	3V ~ 18V	40MHz	-55°C ~ 125°C	Last Time Buy
MC14066BDR2G	onsemi	14-SOIC	240Ohm	—	3V ~ 18V	—	-55°C ~ 125°C	Active
MC14066BDG	onsemi	14-SOIC	240Ohm	—	3V ~ 18V	—	-55°C ~ 125°C	Active
MC74HC4066ADR2G	onsemi	14-SOIC	70Ohm	15Ohm	2V ~ 12V	160MHz	-55°C ~ 125°C	Active
MC74HC4066ADG	onsemi	14-SOIC	70Ohm	15Ohm	2V ~ 12V	160MHz	-55°C ~ 125°C	Active
MC74VHC4066DR2G	onsemi	14-SOIC	70Ohm	15Ohm	2V ~ 12V	160MHz	-55°C ~ 125°C	Active
MC74LVX4066DR2G	onsemi	14-SOIC	20Ohm	10Ohm	2V ~ 6V	160MHz	-55°C ~ 85°C	Active
MC74LVXT4066DR2G	onsemi	14-SOIC	20Ohm	10Ohm	2V ~ 5.5V	160MHz	-55°C ~ 85°C	Obsolete

Engineering Selection Recommendations

Direct Equivalents (240Ohm On-State Resistance):

CD4066BM96 (Texas Instruments, Active status) and CD4066BM (Texas Instruments, Last Time Buy status) are electrically and mechanically identical to the CD4066BCMX. Both maintain the same 240Ohm on-state resistance, 5Ohm channel matching, 3V–18V supply range, and -55°C to 125°C operating temperature. CD4066BM96 is the preferred choice due to Active product status and current availability. Both parts are ROHS3 Compliant and carry identical REACH and ECCN classifications.

MC14066BDR2G and MC14066BDG (onsemi, Active status) provide functional equivalence with identical electrical specifications within the 4000B series. Both are ROHS3 Compliant and suitable for direct substitution. MC14066BDR2G offers higher inventory availability in Cut Tape & Digi-Reel packaging.

High-Performance Variants (70Ohm On-State Resistance):

MC74HC4066ADR2G, MC74HC4066ADG, and MC74VHC4066DR2G reduce on-state resistance to 70Ohm, providing lower signal loss and improved bandwidth performance (160MHz versus 40MHz). These parts operate within a narrower supply range (2V–12V) and maintain the full -55°C to 125°C temperature range. Selection of these variants is appropriate when signal integrity and bandwidth performance are critical design parameters and the 2V–12V supply constraint is compatible with the application.

Ultra-Low-Resistance Variants (20Ohm On-State Resistance):

MC74LVX4066DR2G and MC74LVXT4066DR2G deliver the lowest on-state resistance at 20Ohm, suitable for applications requiring minimal signal attenuation. These parts operate within a reduced supply range (2V–6V and 2V–5.5V respectively) and a narrower temperature range (-55°C to 85°C). MC74LVX4066DR2G maintains Active status; MC74LVXT4066DR2G is Obsolete. Selection is appropriate only when supply voltage and temperature constraints align with application requirements.

All recommended substitutes maintain 14-SOIC packaging, 4-circuit configuration, and MSL 1 moisture sensitivity rating, ensuring PCB assembly compatibility with the original CD4066BCMX design.

Frequently Asked Questions (FAQ)

Q: Can I use MC74HC4066ADR2G as a direct replacement for CD4066BCMX?

A: MC74HC4066ADR2G is mechanically compatible (14-SOIC package, 4 circuits) but operates with different electrical specifications. The on-state resistance is 70Ohm versus 240Ohm, the supply voltage range is 2V–12V versus 3V–18V, and the bandwidth is 160MHz versus 40MHz. This part is suitable only if your application can tolerate the reduced supply range and benefits from lower on-state resistance and higher bandwidth.

Q: What is the difference between CD4066BM96 and CD4066BM?

A: Both parts are electrically identical with 240Ohm on-state resistance and identical electrical specifications. The primary difference is product status: CD4066BM96 is Active with current manufacturing, while CD4066BM is Last Time Buy status. CD4066BM96 is the recommended choice for new designs due to ongoing availability.

Q: Why does MC74LVX4066DR2G have a lower operating temperature range?

A: MC74LVX4066DR2G operates from -55°C to 85°C, compared to the CD4066BCMX range of -55°C to 125°C. This is a design characteristic of the LVX logic family. Selection of this part is appropriate only if your application does not require operation above 85°C.

Q: Can I use a 20Ohm variant in a 3V–18V supply application?

A: No. MC74LVX4066DR2G and MC74LVXT4066DR2G are rated for maximum 2V–6V and 2V–5.5V supply respectively. Operating these parts outside their specified voltage range will result in device failure or unpredictable behavior. Use 240Ohm or 70Ohm variants for 3V–18V applications.

Q: Are all substitute parts RoHS3 Compliant?

A: Yes. All recommended substitute parts carry RoHS3 Compliant status and REACH Unaffected classification, matching the compliance profile of the original CD4066BCMX.

Q: What packaging options are available for the substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube, Cut Tape (CT) & Digi-Reel, and Tape & Reel (TR). All maintain the 14-SOIC form factor. Packaging selection depends on procurement and assembly requirements; electrical performance is identical across packaging variants of the same part number.

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