CD4066BCSJ Equivalent & Substitute Parts

Part Overview

The CD4066BCSJ is a quad bilateral switch interface IC manufactured by onsemi in 14-SOP packaging. This device functions as a 4-circuit SPST switch with 1:1 multiplexer/demultiplexer configuration, rated for supply voltages from 3V to 18V and operating temperatures from -55°C to 125°C. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD4066BCSJ
Manufacturer	onsemi
Switch Circuit Type	SPST
Number of Circuits	4
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	240Ω
Channel-to-Channel Matching (ΔRon)	5Ω
Supply Voltage Single (V+)	3V ~ 18V
-3dB Bandwidth	40MHz
Channel Capacitance (CS(off), CD(off))	8pF
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.209", 5.30mm Width)
Series	4000B
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the CD4066BCSJ is determined by the following critical parameters:

Switch Circuit Type: SPST configuration required
Number of Circuits: 4-circuit requirement
Multiplexer/Demultiplexer Configuration: 1:1 ratio
On-State Resistance: 240Ω maximum (primary group) or lower resistance alternatives (secondary group)
Supply Voltage Range: 3V ~ 18V (CMOS 4000B series) or 2V ~ 10V (HC logic) or 4.5V ~ 5.5V (HCT logic)
Operating Temperature: -55°C ~ 125°C
Mounting Type: Surface Mount
Package Compatibility: 14-SOIC or 14-SO variants

Substitute parts are grouped into two categories:

Group 1 - Direct Equivalents (240Ω On-State Resistance, 4000B Series) These parts maintain identical electrical characteristics and are pin-compatible with the CD4066BCSJ:

CD4066BM (Texas Instruments, 14-SOIC, Last Time Buy)
CD4066BM96 (Texas Instruments, 14-SOIC, Active)
CD4066BM96G4 (Texas Instruments, 14-SOIC, Obsolete)
CD4066BMT (Texas Instruments, 14-SOIC, Last Time Buy)
CD4066BNS (Texas Instruments, 14-SO, Last Time Buy)
CD4066BNSR (Texas Instruments, 14-SO, Active)

Group 2 - Enhanced Performance Alternatives (70Ω On-State Resistance, HC/HCT Logic) These parts offer lower on-state resistance and higher bandwidth but require voltage range verification:

CD74HC4066M (Texas Instruments, 14-SOIC, Last Time Buy, 2V ~ 10V supply)
CD74HC4066M96 (Texas Instruments, 14-SOIC, Active, 2V ~ 10V supply)
CD74HC4066MT (Texas Instruments, 14-SOIC, Last Time Buy, 2V ~ 10V supply)
CD74HCT4066M (Texas Instruments, 14-SOIC, Last Time Buy, 4.5V ~ 5.5V supply)

Parameter Comparison

Part Number	Manufacturer	Switch Type	Circuits	Ron (Max)	ΔRon	Supply Voltage	Bandwidth	Package	Status
CD4066BCSJ	onsemi	SPST	4	240Ω	5Ω	3V ~ 18V	40MHz	14-SOIC (5.30mm)	Obsolete
CD4066BM	Texas Instruments	SPST	4	240Ω	5Ω	3V ~ 18V	40MHz	14-SOIC (3.90mm)	Last Time Buy
CD4066BM96	Texas Instruments	SPST	4	240Ω	5Ω	3V ~ 18V	40MHz	14-SOIC (3.90mm)	Active
CD4066BM96G4	Texas Instruments	SPST	4	240Ω	5Ω	3V ~ 18V	40MHz	14-SOIC (3.90mm)	Obsolete
CD4066BMT	Texas Instruments	SPST	4	240Ω	5Ω	3V ~ 18V	40MHz	14-SOIC (3.90mm)	Last Time Buy
CD4066BNS	Texas Instruments	SPST	4	240Ω	5Ω	3V ~ 18V	40MHz	14-SO (5.30mm)	Last Time Buy
CD4066BNSR	Texas Instruments	SPST	4	240Ω	5Ω	3V ~ 18V	40MHz	14-SO (5.30mm)	Active
CD74HC4066M	Texas Instruments	SPST - NO	4	70Ω	500mΩ	2V ~ 10V	200MHz	14-SOIC (3.90mm)	Last Time Buy
CD74HC4066M96	Texas Instruments	SPST - NO	4	70Ω	500mΩ	2V ~ 10V	200MHz	14-SOIC (3.90mm)	Active
CD74HC4066MT	Texas Instruments	SPST - NO	4	70Ω	500mΩ	2V ~ 10V	200MHz	14-SOIC (3.90mm)	Last Time Buy
CD74HCT4066M	Texas Instruments	SPST - NO	4	70Ω	500mΩ	4.5V ~ 5.5V	200MHz	14-SOIC (3.90mm)	Last Time Buy

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance)

Select from Group 1 substitutes when the application requires exact electrical equivalence to the CD4066BCSJ:

CD4066BM96 is the preferred choice due to Active product status and highest inventory availability (58,480 pcs). This part is ROHS3 compliant and maintains all electrical specifications of the original.
CD4066BNSR is the secondary choice for Active status parts, offering the same 14-SO package footprint as the original CD4066BCSJ. Inventory is adequate at 5,052 pcs.
CD4066BM and CD4066BMT are available but classified as Last Time Buy, indicating limited future availability.

For Enhanced Performance Applications

Select from Group 2 substitutes when the application can accommodate lower on-state resistance and higher bandwidth:

CD74HC4066M96 is Active status with 2,078 pcs inventory. Verify supply voltage compatibility (2V ~ 10V range) before selection.
CD74HCT4066M is suitable only for 5V-centric designs (4.5V ~ 5.5V supply range). Product status is Last Time Buy.

Compliance and Certification

All recommended substitutes carry ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original part. Moisture Sensitivity Level remains MSL 1 (Unlimited) across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can CD4066BM96 directly replace CD4066BCSJ without circuit modification?

A: Yes. CD4066BM96 maintains identical electrical specifications (240Ω on-state resistance, 40MHz bandwidth, 3V ~ 18V supply range, -55°C ~ 125°C operating temperature) and pin configuration. The only difference is package width (3.90mm vs 5.30mm), which is a physical layout consideration, not an electrical one.

Q: What is the difference between CD4066BNS and CD4066BM96?

A: Both are 4-circuit SPST switches with identical electrical performance. The primary difference is package type: CD4066BNS uses 14-SO (0.209" width), while CD4066BM96 uses 14-SOIC (0.154" width). Select based on PCB footprint requirements. CD4066BNSR is the Active status equivalent of CD4066BNS.

Q: Can I use CD74HC4066M96 as a drop-in replacement for CD4066BCSJ?

A: Not without circuit verification. While both are 4-circuit SPST switches in 14-SOIC packaging, CD74HC4066M96 has different electrical characteristics: 70Ω on-state resistance (vs 240Ω), 200MHz bandwidth (vs 40MHz), and restricted supply voltage range (2V ~ 10V vs 3V ~ 18V). Use only if your application operates within 2V ~ 10V and benefits from lower on-state resistance.

Q: Why does CD74HCT4066M have a narrower supply voltage range?

A: CD74HCT4066M is designed for TTL-compatible logic levels and operates at 4.5V ~ 5.5V. The CD4066BCSJ and Group 1 substitutes are CMOS 4000B series parts with wider supply range (3V ~ 18V). Select CD74HCT4066M only for 5V systems requiring TTL compatibility.

Q: Which substitute has the best long-term availability?

A: CD4066BM96 is classified as Active status with the highest inventory (58,480 pcs), indicating ongoing production and long-term availability. All other Group 1 alternatives are either Last Time Buy or Obsolete, indicating limited future procurement windows.

Q: Are there package compatibility issues between 14-SOIC and 14-SO variants?

A: Yes. 14-SOIC (0.154" width) and 14-SO (0.209" width) have different footprints. CD4066BM96 uses 14-SOIC, while CD4066BNSR uses 14-SO. The original CD4066BCSJ uses 14-SOIC (5.30mm width). Verify PCB footprint compatibility before selection.

Q: What does "Last Time Buy" status mean for these parts?

A: Last Time Buy indicates the manufacturer has announced end-of-life for that part number. Existing inventory may be available, but no new production is planned. Parts with this status should be evaluated for long-term design support. CD4066BM96 (Active status) is recommended for new designs.

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