CD74HC4066PWT Equivalent & Substitute Parts Reference

Part Overview

The CD74HC4066PWT is a 4-circuit SPST-NO (Single Pole Single Throw - Normally Open) analog switch IC manufactured by Texas Instruments in 14-TSSOP surface mount packaging. This device functions as a digitally controlled analog switch with 70Ohm on-state resistance and operates across a 2V to 10V single supply voltage range. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Substitute parts must maintain functional compatibility through matching switch circuit topology, circuit count, package form factor, and critical electrical parameters within acceptable tolerance ranges.

Key Parameters

Parameter	CD74HC4066PWT Value	Unit	Substitution Criticality
Switch Circuit Type	SPST - NO	—	Critical
Number of Circuits	4	—	Critical
Multiplexer/Demultiplexer Circuit	1:1	—	Critical
On-State Resistance (Max)	70	Ohm	High
Voltage - Supply, Single (V+)	2V ~ 10V	V	High
-3dB Bandwidth	200	MHz	High
Channel Capacitance (CS(off), CD(off))	5	pF	Medium
Current - Leakage (IS(off)) (Max)	100	nA	Medium
Crosstalk	-72	dB @ 1MHz	Medium
Operating Temperature	-55°C ~ 125°C	°C	High
Package / Case	14-TSSOP	—	Critical
Mounting Type	Surface Mount	—	Critical
RoHS Status	ROHS3 Compliant	—	High

Substitute Part Grouping Explanation

Substitution of the CD74HC4066PWT is determined by strict adherence to the following mandatory parameters:

Critical Parameters (Must Match Exactly):

Switch circuit topology: SPST - NO configuration
Circuit count: 4 independent circuits
Multiplexer ratio: 1:1
Package type: 14-TSSOP surface mount
Mounting technology: Surface mount

High-Priority Parameters (Must Be Within Acceptable Range):

On-state resistance: Substitute maximum must not exceed application requirements; lower values are acceptable
Supply voltage range: Substitute range must encompass or exceed the 2V to 10V requirement
Operating temperature: Substitute range must cover -55°C to 125°C or be suitable for the intended application temperature window
Bandwidth: Substitute bandwidth must meet or exceed 200MHz for signal integrity
RoHS compliance: ROHS3 compliance required for regulatory alignment

Medium-Priority Parameters (Acceptable Variation):

Channel capacitance, leakage current, and crosstalk specifications may vary within application-specific tolerances
Channel-to-channel matching (ΔRon) variations are acceptable if total on-state resistance remains within limits

Substitutes are grouped into two categories: direct equivalents (matching all critical and high-priority parameters) and functional alternatives (meeting critical parameters with enhanced or modified electrical characteristics suitable for specific applications).

Parameter Comparison

Parameter	CD74HC4066PWT	CD74HC4066PWR	MC74HC4066ADTR2G	74HC4066PW,118	74HC4066PW-Q100,11	MAX4737EUD+T	MAX4747EUD+T	MC14066BDTR2G
Manufacturer	Texas Instruments	Texas Instruments	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	Bilateral, FET
Number of Circuits	4	4	4	4	4	4	4	4
On-State Resistance (Max)	70 Ohm	70 Ohm	70 Ohm	95 Ohm	95 Ohm	4.5 Ohm	25 Ohm	—
Voltage - Supply, Single (V+)	2V ~ 10V	2V ~ 10V	2V ~ 12V	2V ~ 10V	2V ~ 10V	1.8V ~ 5.5V	2V ~ 11V	3V ~ 18V (Dual)
-3dB Bandwidth	200 MHz	200 MHz	160 MHz	200 MHz	200 MHz	300 MHz	250 MHz	—
Channel Capacitance (CS(off), CD(off))	5 pF	5 pF	10 pF	3.5 pF	3.5 pF	9 pF	20 pF	—
Current - Leakage (IS(off)) (Max)	100 nA	100 nA	100 nA	1 µA	1 µA	500 pA	100 pA	—
Crosstalk	-72 dB @ 1MHz	-72 dB @ 1MHz	-80 dB @ 1MHz	-60 dB @ 1MHz	-60 dB @ 1MHz	-110 dB @ 1MHz	-84 dB @ 1MHz	—
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C
Package / Case	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP
Packaging Type	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Tier 1: Direct Equivalents (Recommended Primary Substitutes)

CD74HC4066PWR (Texas Instruments, Active Status) This part is the direct active equivalent of the CD74HC4066PWT. It maintains identical electrical specifications including 70Ohm on-state resistance, 2V to 10V supply range, 200MHz bandwidth, and -55°C to 125°C operating temperature. The only difference is packaging format (Tape & Reel versus Cut Tape), which does not affect electrical function. This substitute is recommended as the primary replacement for obsolete CD74HC4066PWT applications. Inventory availability is significantly higher (140,595 units in stock).

MC74HC4066ADTR2G (onsemi, Active Status) This onsemi-manufactured part meets all critical substitution parameters with identical SPST-NO 4-circuit topology in 14-TSSOP packaging. Electrical specifications are equivalent with 70Ohm on-state resistance and matching supply voltage range. The part exhibits enhanced crosstalk performance (-80dB versus -72dB) and extended supply voltage tolerance (2V to 12V). Operating temperature range matches the original specification. This substitute is suitable for direct replacement in existing designs.

Tier 2: Functional Alternatives (Enhanced Performance Substitutes)

74HC4066PW,118 and 74HC4066PW-Q100,11 (Nexperia USA Inc., Active Status) These Nexperia parts maintain the critical SPST-NO 4-circuit topology and 14-TSSOP package but feature 95Ohm on-state resistance (25Ohm higher than original). Both parts deliver 200MHz bandwidth matching the original specification. The 74HC4066PW-Q100,11 variant includes AEC-Q100 automotive qualification and is suitable for automotive-grade applications. Operating temperature for these parts is -40°C to 125°C (narrower low-temperature range than original). These substitutes are acceptable where the higher on-state resistance does not compromise circuit performance.

MAX4737EUD+T (Analog Devices Inc./Maxim Integrated, Active Status) This part represents a performance-enhanced substitute with significantly lower on-state resistance (4.5Ohm versus 70Ohm), superior crosstalk isolation (-110dB), and higher bandwidth (300MHz). However, the supply voltage range is restricted to 1.8V to 5.5V, which is narrower than the original 2V to 10V specification. Operating temperature is limited to -40°C to 85°C. This substitute is suitable for applications requiring lower on-state resistance and operating within the specified voltage and temperature constraints.

MAX4747EUD+T (Analog Devices Inc./Maxim Integrated, Active Status) This part offers intermediate performance characteristics with 25Ohm on-state resistance (lower than original 70Ohm) and enhanced crosstalk performance (-84dB). Bandwidth is 250MHz, exceeding the original 200MHz specification. Supply voltage range is 2V to 11V, encompassing the original requirement. Operating temperature is -40°C to 85°C. This substitute provides a balanced performance upgrade suitable for applications requiring improved signal integrity within the specified operating window.

Tier 3: Alternative Topology (Limited Compatibility)

MC14066BDTR2G (onsemi, Active Status) This part employs bilateral FET switch topology rather than SPST-NO configuration, representing a functional alternative rather than direct equivalent. It features 4 independent circuits in 14-TSSOP packaging with dual supply operation (3V to 18V). Operating temperature range is -55°C to 125°C, matching the original specification. This substitute is applicable only in designs where bilateral switch functionality is acceptable and where dual supply voltage is available. Direct pin-for-pin compatibility cannot be assumed.

Compliance and Certification Basis

All recommended substitutes maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring regulatory alignment with the original part. The 74HC4066PW-Q100,11 variant includes AEC-Q100 automotive qualification for applications requiring automotive-grade component certification. Selection among active substitutes should prioritize product status (all recommended parts are active), compliance certifications, and electrical parameter alignment with application requirements.

Frequently Asked Questions (FAQ)

Q1: Can CD74HC4066PWR be used as a direct replacement for CD74HC4066PWT?

A: Yes. CD74HC4066PWR is the active equivalent of the obsolete CD74HC4066PWT. Both parts share identical electrical specifications including on-state resistance (70Ohm), supply voltage range (2V to 10V), bandwidth (200MHz), and operating temperature (-55°C to 125°C). The only difference is packaging format: CD74HC4066PWT is supplied in Cut Tape, while CD74HC4066PWR is supplied in Tape & Reel. Electrical function and pin configuration are identical.

Q2: What is the primary difference between the 74HC4066 variants from different manufacturers?

A: The 74HC4066 base product number is manufactured by multiple suppliers (Texas Instruments, onsemi, Nexperia) with variations in on-state resistance and electrical performance. Texas Instruments and onsemi versions maintain 70Ohm on-state resistance, while Nexperia versions feature 95Ohm on-state resistance. All variants maintain the same SPST-NO 4-circuit topology, 14-TSSOP package, and 200MHz bandwidth. Selection depends on application tolerance for on-state resistance variation and supply voltage requirements.

Q3: Are MAX4737 and MAX4747 parts suitable substitutes for CD74HC4066PWT?

A: MAX4737 and MAX4747 parts are functional alternatives rather than direct equivalents. Both maintain the critical SPST-NO 4-circuit topology and 14-TSSOP package but feature significantly lower on-state resistance (4.5Ohm and 25Ohm respectively versus 70Ohm). These parts offer superior crosstalk isolation and higher bandwidth. However, the supply voltage range is restricted to 1.8V to 5.5V (MAX4737) or 2V to 11V (MAX4747), and operating temperature is limited to -40°C to 85°C. These substitutes are suitable only for applications operating within these voltage and temperature constraints.

Q4: What does "SPST - NO" mean in the context of switch IC selection?

A: SPST - NO designates Single Pole Single Throw - Normally Open switch configuration. This means each circuit has one input terminal and one output terminal, with the switch in the open (non-conducting) state when control logic is inactive. When the control signal is applied, the switch closes, establishing a conductive path between input and output. This topology is fundamental to analog switch ICs and must be maintained in any substitute part.

Q5: Why is the 14-TSSOP package critical for substitution?

A: The 14-TSSOP (Thin Shrink Small Outline Package) is a specific surface mount package with defined pin count (14 pins), pin spacing (0.65mm), and physical dimensions (0.173" width, 4.40mm total width). This package format determines PCB footprint, solder pad layout, and assembly compatibility. Substituting with a different package type (such as DIP, SOIC, or QFP) requires PCB redesign and assembly process changes. All recommended substitutes maintain the 14-TSSOP package to ensure direct compatibility.

Q6: What is the significance of the -55°C to 125°C operating temperature range?

A: The -55°C to 125°C operating temperature range specifies the ambient temperature limits within which the part maintains specified electrical performance. This extended range is typical for industrial and military-grade components. Some substitutes (Nexperia and Maxim parts) feature narrower ranges (-40°C to 125°C or -40°C to 85°C). Selection of substitutes with narrower temperature ranges is acceptable only if the application operates within those limits. For applications requiring the full -55°C to 125°C range, CD74HC4066PWR, MC74HC4066ADTR2G, or MC14066BDTR2G are required.

Q7: How does on-state resistance affect circuit performance?

A: On-state resistance (Ron) determines the voltage drop across the closed switch and affects signal attenuation, power dissipation, and frequency response. Lower on-state resistance reduces signal loss and heat generation. The original CD74HC4066PWT specifies 70Ohm maximum on-state resistance. Substitutes with higher resistance (Nexperia parts at 95Ohm) introduce greater signal attenuation, while substitutes with lower resistance (MAX4737 at 4.5Ohm, MAX4747 at 25Ohm) improve signal integrity. Selection depends on application sensitivity to signal loss and power dissipation constraints.

Q8: What is the importance of RoHS3 compliance in substitute selection?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates that the component does not contain restricted substances including lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers. All recommended substitutes maintain ROHS3 compliance, ensuring regulatory alignment with environmental and safety standards. This compliance is mandatory for components used in consumer electronics and many industrial applications.

Q9: Can MC14066BDTR2G be used in place of CD74HC4066PWT?

A: MC14066BDTR2G is a functional alternative with important limitations. While it maintains the 4-circuit configuration and 14-TSSOP package, it employs bilateral FET switch topology rather than SPST-NO configuration. Bilateral switches conduct in both directions and operate with dual supply voltage (3V to 18V) rather than single supply (2V to 10V). Pin configuration and control logic may differ. This part is suitable only for applications where bilateral switch functionality is acceptable and where dual supply voltage is available. Direct pin-for-pin substitution cannot be assumed without circuit analysis.

Q10: What packaging format should be selected: Cut Tape (CT) or Tape & Reel (TR)?

A: Cut Tape (CT) packaging is suitable for small-quantity orders, prototyping, and manual assembly operations. Tape & Reel (TR) packaging is designed for high-volume automated assembly using pick-and-place equipment. The electrical specifications are identical between packaging formats. Selection depends on production volume and assembly methodology. For production continuity, CD74HC4066PWR (Tape & Reel) is recommended over CD74HC4066PWT (Cut Tape) due to higher inventory availability and suitability for automated manufacturing processes.

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