SN74HC4066N Equivalent & Substitute Parts

Part Overview

The SN74HC4066N is a 4-circuit SPST-NO IC switch manufactured by Texas Instruments, designed for signal routing and switching applications in digital and analog circuits. This part operates with a single supply voltage of 2V to 6V and features a typical on-state resistance of 30Ohm with fast switching times (31ns/34ns). The SN74HC4066N is classified as Last Time Buy, indicating limited future availability. Identifying qualified substitute parts ensures design continuity and supply chain resilience for applications requiring equivalent switching functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HC4066N
Manufacturer	Texas Instruments
Category	Interface
Switch Circuit Type	SPST - NO
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	30Ohm (Typ)
Voltage - Supply, Single (V+)	2V ~ 6V
Switch Time (Ton, Toff)	31ns, 34ns
-3dB Bandwidth	30MHz
Current - Leakage (IS(off)) (Max)	100nA
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	14-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SN74HC4066N is determined by the following critical parameters:

Switch Circuit Type: Must be SPST - NO (Single Pole Single Throw - Normally Open)
Number of Circuits: Must be 4 independent circuits
Multiplexer/Demultiplexer Configuration: Must be 1:1
Supply Voltage Compatibility: Operating voltage range must overlap with or exceed 2V ~ 6V
Package Type: Through-hole mounting with 14-DIP footprint preferred for direct replacement; surface-mount alternatives acceptable if design permits
On-State Resistance: Lower values (30Ohm to 80Ohm) maintain signal integrity; higher values acceptable if application tolerates increased insertion loss
Switching Speed: Faster switching times improve performance; slower times acceptable if application timing requirements are met
Leakage Current: Lower leakage preferred for precision applications
Regulatory Compliance: RoHS3 compliance required; REACH unaffected status maintained

Four qualified substitute parts meet these criteria with varying trade-offs in on-state resistance, switching speed, bandwidth, and package form factor.

Parameter Comparison

Parameter	SN74HC4066N (Main)	SN74AHC4066PWR	MAX4066CPD+	TC4066BP-NF	TC74HC4066APF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc./Maxim Integrated	Toshiba Semiconductor and Storage	Toshiba Semiconductor and Storage
Switch Circuit Type	SPST - NO	SPST - NO	SPST - NO	Bilateral, FET Switches	SPST - NO
Number of Circuits	4	4	4	4	4
Multiplexer/Demultiplexer Circuit	1:1	1:1	1:1	1:1	1:1
On-State Resistance (Max)	30Ohm (Typ)	75Ohm	45Ohm	-	80Ohm
Voltage - Supply, Single (V+)	2V ~ 6V	2V ~ 5.5V	2V ~ 16V	-	2V ~ 12V
Switch Time (Ton, Toff) (Max)	31ns, 34ns	12ns, 12ns	100ns, 75ns	-	12ns, 18ns
-3dB Bandwidth	30MHz	50MHz	100MHz	-	200MHz
Current - Leakage (IS(off)) (Max)	100nA	100nA	1nA	-	1µA
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	0°C ~ 70°C (TA)	-40°C ~ 85°C	-40°C ~ 85°C (TA)
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)	14-TSSOP (0.173", 4.40mm Width)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Product Status	Last Time Buy	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74AHC4066PWR (Texas Instruments): This part offers improved switching speed (12ns vs. 31ns) and higher bandwidth (50MHz vs. 30MHz) compared to the main part. Supply voltage range is slightly reduced (2V ~ 5.5V vs. 2V ~ 6V). On-state resistance is higher at 75Ohm. The primary trade-off is package form factor: surface-mount 14-TSSOP versus through-hole 14-DIP. This substitute is suitable for designs where PCB space is constrained and the higher on-state resistance is acceptable. Product status is Last Time Buy, similar to the main part.

MAX4066CPD+ (Analog Devices Inc./Maxim Integrated): This part provides the widest supply voltage range (2V ~ 16V) and superior bandwidth (100MHz). On-state resistance is moderate at 45Ohm. Leakage current is exceptionally low at 1nA. Operating temperature range is narrower (0°C ~ 70°C vs. -40°C ~ 85°C). This substitute is optimal for applications requiring extended supply voltage flexibility and precision low-leakage switching. Product status is Active, ensuring long-term availability. Through-hole 14-DIP package enables direct PCB replacement.

TC4066BP-NF (Toshiba Semiconductor and Storage): This part is classified as a bilateral FET switch rather than a standard SPST switch, offering bidirectional switching capability. Supply voltage range is 3V ~ 18V (dual supply). Detailed on-state resistance and switching time specifications are not provided. This substitute is suitable for applications requiring bidirectional signal routing. Product status is Active. Through-hole 14-DIP package is compatible with existing designs.

TC74HC4066APF (Toshiba Semiconductor and Storage): This part delivers the highest bandwidth (200MHz) and fastest switching times (12ns/18ns). On-state resistance is 80Ohm. Supply voltage range is 2V ~ 12V. Leakage current is higher at 1µA. This substitute is ideal for high-frequency applications where bandwidth and switching speed are critical. Product status is Active, ensuring availability. Through-hole 14-DIP package provides direct replacement compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AHC4066PWR as a direct PCB replacement for SN74HC4066N?

A: No. While both parts are 14-pin DIP packages, SN74AHC4066PWR uses surface-mount 14-TSSOP packaging, which is not compatible with through-hole DIP footprints. PCB redesign is required.

Q: What is the primary difference between SPST-NO and bilateral FET switches?

A: SPST-NO (Single Pole Single Throw - Normally Open) switches conduct signal in one direction when activated. Bilateral FET switches (such as TC4066BP-NF) conduct signal bidirectionally. Select based on application requirements.

Q: Which substitute part has the lowest on-state resistance?

A: SN74HC4066N has the lowest on-state resistance at 30Ohm (typical). Among substitutes, MAX4066CPD+ offers 45Ohm, SN74AHC4066PWR offers 75Ohm, and TC74HC4066APF offers 80Ohm.

Q: Is MAX4066CPD+ suitable for -40°C operation?

A: No. MAX4066CPD+ operates from 0°C ~ 70°C. For applications requiring -40°C operation, select SN74AHC4066PWR, TC4066BP-NF, or TC74HC4066APF.

Q: Which substitute provides the highest bandwidth?

A: TC74HC4066APF provides 200MHz bandwidth, followed by MAX4066CPD+ at 100MHz, SN74AHC4066PWR at 50MHz, and SN74HC4066N at 30MHz.

Q: Can I use a substitute with higher on-state resistance without affecting circuit performance?

A: Higher on-state resistance increases insertion loss and signal attenuation. Verify that your application tolerates the increased resistance. For precision analog switching, lower resistance is preferred.

Q: What is the supply voltage overlap between SN74HC4066N and all substitutes?

A: The common supply voltage range across all parts is 2V ~ 5.5V. Applications operating above 5.5V require careful part selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

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