CD4066BCM Equivalent & Substitute Parts

Part Overview

The CD4066BCM is a quad bilateral switch IC manufactured by onsemi in 14-SOIC surface mount packaging. This device functions as a 4-circuit SPST (Single Pole Single Throw) switch with 1:1 multiplexer/demultiplexer configuration, featuring 240Ω maximum on-state resistance and operating across a 3V to 18V supply range. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	CD4066BCM Value
Manufacturer	onsemi
Switch Circuit Type	SPST
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	240Ω
Channel-to-Channel Matching (ΔRon)	5Ω
Voltage Supply Range (V+)	3V ~ 18V
-3dB Bandwidth	40MHz
Channel Capacitance (CS(off), CD(off))	8pF
Operating Temperature	-55°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Series	4000B
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the CD4066BCM is determined by the following critical parameters:

Primary Substitution Criteria:

Package type: 14-SOIC surface mount form factor
Circuit configuration: 4 independent SPST switch circuits with 1:1 multiplexer/demultiplexer topology
Operating temperature range: Minimum -55°C to 125°C coverage
Supply voltage compatibility: Overlap with 3V to 18V range

Secondary Compatibility Factors:

On-state resistance: Maximum 240Ω (higher resistance values indicate different electrical characteristics)
Channel-to-channel matching: ΔRon ≤ 5Ω preferred for signal integrity
Bandwidth performance: Minimum 40MHz (-3dB)
Channel capacitance: Maximum 8pF

Substitute parts are grouped into two categories: direct equivalents from the 4000B series (CD4066 base product variants) and functional alternatives from higher-performance logic families (74HC4066, 74LVX4066, 74LVXT4066, 74VHC4066) that maintain identical pinout and circuit topology while offering improved electrical characteristics.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	ΔRon	Supply Voltage	-3dB Bandwidth	Channel Capacitance	Operating Temp	Package	Product Status
CD4066BCM	onsemi	240Ω	5Ω	3V ~ 18V	40MHz	8pF	-55°C ~ 125°C	14-SOIC	Obsolete
MC14066BDG	onsemi	—	—	3V ~ 18V	—	—	-55°C ~ 125°C	14-SOIC	Active
MC14066BDR2G	onsemi	—	—	3V ~ 18V	—	—	-55°C ~ 125°C	14-SOIC	Active
MC74HC4066ADG	onsemi	70Ω	15Ω	2V ~ 12V	160MHz	10pF	-55°C ~ 125°C	14-SOIC	Active
MC74HC4066ADR2G	onsemi	70Ω	15Ω	2V ~ 12V	160MHz	10pF	-55°C ~ 125°C	14-SOIC	Active
MC74LVX4066DR2G	onsemi	20Ω	10Ω	2V ~ 6V	160MHz	10pF	-55°C ~ 85°C	14-SOIC	Active
MC74LVXT4066DR2G	onsemi	20Ω	10Ω	2V ~ 5.5V	160MHz	10pF	-55°C ~ 85°C	14-SOIC	Obsolete
MC74VHC4066DR2G	onsemi	70Ω	15Ω	2V ~ 12V	160MHz	10pF	-55°C ~ 125°C	14-SOIC	Active
CD4066BM	Texas Instruments	240Ω	5Ω	3V ~ 18V	40MHz	8pF	-55°C ~ 125°C	14-SOIC	Last Time Buy
CD4066BM96	Texas Instruments	240Ω	5Ω	3V ~ 18V	40MHz	8pF	-55°C ~ 125°C	14-SOIC	Active
CD4066BM96G4	Texas Instruments	240Ω	5Ω	3V ~ 18V	40MHz	8pF	-55°C ~ 125°C	14-SOIC	Obsolete

Engineering Selection Recommendations

Direct Equivalents (Preferred for Existing Designs):

CD4066BM96 (Texas Instruments, Active status) provides identical electrical specifications to CD4066BCM with full parameter matching: 240Ω on-state resistance, 5Ω channel matching, 3V to 18V supply range, and -55°C to 125°C operating temperature. This part maintains 4000B series compatibility and is currently in active production with high inventory availability (58,480 pcs). Packaging options include Cut Tape & Digi-Reel format.

MC14066BDG and MC14066BDR2G (onsemi, Active status) represent the manufacturer's current-generation equivalent within the 4000B series. Both maintain identical supply voltage range (3V to 18V) and operating temperature specifications (-55°C to 125°C). MC14066BDR2G offers superior inventory depth (55,300 pcs) in Tape & Reel packaging.

Performance-Enhanced Alternatives (For New Designs):

MC74HC4066ADR2G and MC74VHC4066DR2G (onsemi, Active status) offer improved electrical performance with 70Ω on-state resistance, 160MHz bandwidth (4x improvement), and enhanced channel capacitance control (10pF). Both support -55°C to 125°C temperature range and maintain 14-SOIC pinout compatibility. Supply voltage range reduces to 2V to 12V, which covers the CD4066BCM operating window.

MC74LVX4066DR2G (onsemi, Active status) provides the lowest on-state resistance (20Ω) and operates across 2V to 6V supply range. Operating temperature is limited to -55°C to 85°C. This variant is suitable for low-voltage applications where the reduced temperature range is acceptable.

Compliance and Certification:

All recommended substitutes carry ROHS3 compliance and REACH Unaffected status, matching the original part's regulatory posture. Moisture Sensitivity Level remains MSL 1 (Unlimited) across all variants, eliminating moisture handling requirement changes.

Frequently Asked Questions (FAQ)

Q: Can MC74HC4066ADR2G directly replace CD4066BCM in existing circuits?

A: Yes, with supply voltage verification. MC74HC4066ADR2G maintains identical 14-SOIC pinout and 4-circuit SPST topology. The supply voltage range (2V to 12V) overlaps with CD4066BCM's 3V to 18V range. However, if your circuit operates above 12V, this substitute is not suitable. The lower on-state resistance (70Ω vs. 240Ω) improves signal integrity and reduces power dissipation.

Q: What is the difference between CD4066BM and CD4066BM96?

A: Both are Texas Instruments CD4066 variants with identical electrical specifications. CD4066BM96 is the current active production part available in Cut Tape & Digi-Reel packaging with 58,480 pcs inventory. CD4066BM is Last Time Buy status. For new procurement, specify CD4066BM96.

Q: Why do MC14066BDG and MC14066BDR2G have incomplete parameter data?

A: These onsemi 4000B series parts are functionally equivalent bilateral switch ICs with identical supply voltage (3V to 18V) and temperature range (-55°C to 125°C) specifications. The missing detailed parameters (on-state resistance, bandwidth) indicate they maintain the same electrical class as CD4066BCM. Confirm specific resistance and bandwidth requirements with onsemi datasheets if critical to your application.

Q: Is MC74LVX4066DR2G suitable for my -55°C to 125°C application?

A: No. MC74LVX4066DR2G operates only to 85°C maximum. If your application requires the full -55°C to 125°C range, select MC74HC4066ADR2G, MC74VHC4066DR2G, or CD4066BM96 instead.

Q: What packaging options are available for active substitutes?

A: CD4066BM96 is available in Cut Tape & Digi-Reel format. MC14066BDR2G is supplied in Tape & Reel. MC74HC4066ADR2G and MC74VHC4066DR2G are available in Tape & Reel and Cut Tape & Digi-Reel formats respectively. All maintain 14-SOIC (0.154", 3.90mm width) surface mount package specification.

Q: Can I use a higher-bandwidth part like MC74HC4066ADR2G in a low-frequency application?

A: Yes. Higher bandwidth (160MHz vs. 40MHz) provides improved performance margin without creating compatibility issues in lower-frequency circuits. The 14-SOIC pinout remains identical, and supply voltage overlap ensures direct substitution feasibility.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message