CD74HC4066M Equivalent & Substitute Parts

Part Overview

The CD74HC4066M is a 4-circuit SPST-NO analog switch IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This device functions as a general-purpose analog switch with 70Ohm on-state resistance and operates across a 2V to 10V single supply voltage range. The part is designated as Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain flexibility for applications requiring SPST-NO switching functionality with compatible electrical and mechanical specifications.

Key Parameters

Parameter	CD74HC4066M
Manufacturer	Texas Instruments
Switch Circuit Type	SPST - NO
Number of Circuits	4
On-State Resistance (Max)	70Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm
Voltage - Supply, Single (V+)	2V ~ 10V
-3dB Bandwidth	200MHz
Channel Capacitance (CS(off), CD(off))	5pF
Current - Leakage (IS(off)) (Max)	100nA
Crosstalk	-72dB @ 1MHz
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC4066M is determined by the following critical parameters:

Primary Compatibility Criteria:

Switch circuit topology: SPST - NO (Single Pole Single Throw - Normally Open)
Number of circuits: 4
Package type: 14-SOIC surface mount
On-state resistance: Maximum 70Ohm (allows lower resistance alternatives)
Supply voltage range: Minimum 2V to 10V compatibility
Operating temperature: -55°C to 125°C range coverage
RoHS3 compliance and MSL 1 rating

Substitution Logic: Parts are grouped into three categories based on electrical performance relative to the main part:

Group 1 - Direct Equivalents (Identical Specifications): Parts with matching on-state resistance (70Ohm), channel matching (500mOhm), bandwidth (200MHz), and identical supply voltage range. These provide pin-for-pin compatibility with no design modifications required.

Group 2 - Enhanced Performance Substitutes (Improved Specifications): Parts with lower on-state resistance (45Ohm), superior channel matching, extended supply voltage range (up to 16V), or improved leakage characteristics. These offer better performance margins and are suitable for designs where enhanced specifications do not conflict with existing component selections.

Group 3 - Alternative Specifications (Different Operating Parameters): Parts with higher on-state resistance (95Ohm or 155Ohm), different bandwidth characteristics, or modified operating temperature ranges. These require design review to confirm compatibility with signal integrity and switching speed requirements.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance (Max)	ΔRon (Max)	Supply Voltage (V+)	-3dB Bandwidth	Channel Capacitance	Leakage (IS(off))	Crosstalk @ 1MHz	Operating Temp	Package	Status
CD74HC4066M	Texas Instruments	70Ohm	500mOhm	2V ~ 10V	200MHz	5pF	100nA	-72dB	-55°C ~ 125°C	14-SOIC	Last Time Buy
CD74HC4066M96	Texas Instruments	70Ohm	500mOhm	2V ~ 10V	200MHz	5pF	100nA	-72dB	-55°C ~ 125°C	14-SOIC	Active
MC74VHC4066DR2G	onsemi	70Ohm	15Ohm	2V ~ 12V	160MHz	10pF	100nA	-80dB	-55°C ~ 125°C	14-SOIC	Active
74HC4066D,653	Nexperia USA Inc.	95Ohm	3Ohm	2V ~ 10V	200MHz	4.6pF	1µA	-60dB	-40°C ~ 125°C	14-SOIC	Active
74HC4066D-Q100,118	Nexperia USA Inc.	95Ohm	3Ohm	2V ~ 10V	200MHz	4.6pF	1µA	-60dB	-40°C ~ 125°C	14-SOIC	Active
HEF4066BT,653	Nexperia USA Inc.	155Ohm	5Ohm	3V ~ 15V	90MHz	7.5pF	200nA	-50dB	-40°C ~ 125°C	14-SOIC	Active
MAX4066ACSD+	Analog Devices Inc./Maxim Integrated	45Ohm	500mOhm	2V ~ 16V	100MHz	9pF	100pA	-86dB	0°C ~ 70°C	14-SOIC	Active
MAX4066ACSD+T	Analog Devices Inc./Maxim Integrated	45Ohm	500mOhm	2V ~ 16V	100MHz	9pF	100pA	-86dB	0°C ~ 70°C	14-SOIC	Active
MAX4066AESD+	Analog Devices Inc./Maxim Integrated	45Ohm	500mOhm	2V ~ 16V	100MHz	9pF	100pA	-86dB	-40°C ~ 85°C	14-SOIC	Active
MAX4066AESD+T	Analog Devices Inc./Maxim Integrated	45Ohm	500mOhm	2V ~ 16V	100MHz	9pF	100pA	-86dB	-40°C ~ 85°C	14-SOIC	Active
MAX4066CSD+	Analog Devices Inc./Maxim Integrated	45Ohm	500mOhm	2V ~ 16V	100MHz	9pF	1nA	-86dB	0°C ~ 70°C	14-SOIC	Active

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required): CD74HC4066M96 is the primary substitute. Manufactured by Texas Instruments with identical electrical specifications and 14-SOIC packaging, this part maintains full compatibility with existing designs. Product status is Active, ensuring long-term availability and supply continuity.

For Enhanced Performance Applications: MAX4066AESD+ and MAX4066AESD+T offer superior electrical characteristics including 45Ohm on-state resistance (35% lower than original), extended supply voltage range (2V to 16V), and exceptional crosstalk performance (-86dB). These parts are suitable for designs requiring improved signal integrity and lower insertion loss. Operating temperature range is -40°C to 85°C. Both Tube and Tape & Reel packaging options are available.

For Cost-Optimized Designs: MC74VHC4066DR2G from onsemi provides equivalent 70Ohm on-state resistance with improved channel matching (15Ohm versus 500mOhm) and superior crosstalk (-80dB). Supply voltage range extends to 12V. This part is Active status with strong availability.

For Extended Temperature Range Applications: 74HC4066D-Q100,118 from Nexperia includes AEC-Q100 automotive qualification and maintains -40°C to 125°C operating range. This part is suitable for automotive and industrial applications requiring qualified components.

For Low-Frequency Applications: HEF4066BT,653 from Nexperia operates across 3V to 15V supply range with 155Ohm on-state resistance. This part is appropriate for low-speed switching applications where higher on-state resistance is acceptable and extended supply voltage range is beneficial.

All substitute parts maintain ROHS3 compliance and MSL 1 rating consistent with the original CD74HC4066M specification.

Frequently Asked Questions (FAQ)

Q: Can CD74HC4066M96 be used as a direct replacement for CD74HC4066M? A: Yes. CD74HC4066M96 is manufactured by Texas Instruments with identical electrical specifications, on-state resistance (70Ohm), supply voltage range (2V to 10V), and 14-SOIC packaging. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube) and Active product status. No design modifications are required.

Q: What is the difference between MAX4066AESD+ and MAX4066ACSD+? A: Both parts have identical electrical specifications and 45Ohm on-state resistance. The primary difference is operating temperature range: MAX4066AESD+ operates -40°C to 85°C, while MAX4066ACSD+ operates 0°C to 70°C. Select MAX4066AESD+ for extended low-temperature applications.

Q: Can I use HEF4066BT,653 in place of CD74HC4066M? A: HEF4066BT,653 is functionally compatible but has different electrical characteristics. On-state resistance is 155Ohm (versus 70Ohm), -3dB bandwidth is 90MHz (versus 200MHz), and supply voltage range is 3V to 15V (versus 2V to 10V). This part is suitable only for low-frequency switching applications where higher on-state resistance does not degrade performance.

Q: Are all substitute parts available in 14-SOIC packaging? A: Yes. All listed substitute parts are available in 14-SOIC surface mount packaging, maintaining mechanical compatibility with the original CD74HC4066M footprint.

Q: What does "Last Time Buy" status mean for CD74HC4066M? A: Last Time Buy indicates that Texas Instruments has discontinued production of this part. Existing inventory may be available, but no new manufacturing runs are planned. Substitution to Active status parts (such as CD74HC4066M96 or MC74VHC4066DR2G) is recommended for new designs and long-term supply security.

Q: Which substitute part offers the best crosstalk performance? A: MAX4066AESD+, MAX4066AESD+T, and MAX4066CSD+ all provide -86dB crosstalk at 1MHz, which is superior to the original CD74HC4066M specification of -72dB. These parts are recommended for applications requiring minimal signal coupling between channels.

Q: Can I use 74HC4066D-Q100,118 in non-automotive applications? A: Yes. 74HC4066D-Q100,118 includes AEC-Q100 automotive qualification, but this certification does not restrict use in non-automotive applications. The part is fully compatible with standard industrial and consumer applications and offers the advantage of automotive-grade reliability.

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