SN74LVC2G66DCTRG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC2G66DCTRG4 is a dual SPST-NO (Single Pole Single Throw - Normally Open) analog switch IC manufactured by Texas Instruments. This component functions as a 1:1 multiplexer/demultiplexer with two independent circuits, each featuring 10Ohm on-state resistance. The device operates across a single supply voltage range of 1.65V to 5.5V and is housed in an 8-pin SM8 (LSSOP/MSOP) surface mount package.

The SN74LVC2G66DCTRG4 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers, offering identical or enhanced electrical characteristics while maintaining functional compatibility for most applications.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Number of Circuits	2
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	10Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm (Max)
Supply Voltage Range (V+)	1.65V ~ 5.5V
Switch Time (Ton, Toff)	3.9ns, 6.3ns (Max)
-3dB Bandwidth	300MHz
Channel Capacitance (CS(off), CD(off))	6pF
Current - Leakage (IS(off)) (Max)	100nA
Crosstalk	-58dB @ 1MHz
Operating Temperature Range	-40°C ~ 85°C (TA)
Package / Case	8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74LVC2G66DCTRG4 is determined by the following critical parameters:

Switch Circuit Type: Must be SPST - NO
Number of Circuits: Must be 2 independent circuits
Multiplexer Configuration: Must be 1:1
On-State Resistance: Maximum 10Ohm (allows equal or lower values)
Supply Voltage Compatibility: Must support the application's operating voltage within 1.65V ~ 5.5V range
Package Type: Surface mount 8-pin configuration (LSSOP, MSOP, TSSOP, or uMAX variants acceptable)
Operating Temperature: Must support -40°C ~ 85°C minimum

Substitute parts are grouped into two categories:

Category 1 - Direct Parametric Equivalents (Texas Instruments & Nexperia): SN74LVC2G66DCTR, 74LVC2G66DP,125, and 74LVC2G66DP-Q100H maintain identical or superior electrical specifications with full functional compatibility.

Category 2 - Functional Equivalents with Enhanced Specifications (Analog Devices/Maxim & Toshiba): MAX4731EUA+, MAX4731EUA+T, and TC7W66FU,LF provide equivalent switching functionality with different on-state resistance and supply voltage characteristics, suitable for applications where these parameters are acceptable.

Parameter Comparison

Parameter	SN74LVC2G66DCTRG4	SN74LVC2G66DCTR	74LVC2G66DP,125	74LVC2G66DP-Q100H	MAX4731EUA+	MAX4731EUA+T	TC7W66FU,LF
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Toshiba Semiconductor
Product Status	Discontinued	Active	Active	Active	Active	Active	Active
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	Bilateral, FET
Number of Circuits	2	2	2	2	2	2	2
On-State Resistance (Max)	10Ohm	10Ohm	10Ohm	10Ohm	25Ohm	25Ohm	-
Supply Voltage Range	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	2V ~ 11V	2V ~ 11V	2V ~ 12V
Switch Time Ton (Max)	3.9ns	3.9ns	3.9ns	3.9ns	85ns	85ns	-
Switch Time Toff (Max)	6.3ns	6.3ns	5ns	5ns	45ns	45ns	-
-3dB Bandwidth	300MHz	300MHz	500MHz	500MHz	300MHz	300MHz	-
Channel Capacitance (pF)	6	6	5	5	20	20	-
Leakage Current (Max)	100nA	100nA	5µA	5µA	100pA	100pA	-
Crosstalk @ 1MHz	-58dB	-58dB	-56dB	-56dB	-108dB	-108dB	-
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	8-LSSOP/MSOP	8-LSSOP/MSOP	8-TSSOP/MSOP	8-TSSOP/MSOP	8-uMAX/uSOP	8-uMAX/uSOP	8-TSSOP/MSOP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - SN74LVC2G66DCTR (Texas Instruments)

The SN74LVC2G66DCTR is the direct parametric equivalent to the discontinued SN74LVC2G66DCTRG4. It maintains identical electrical specifications and is currently in active production status. This part is available in high volume (219,452 pcs in stock) and is the preferred choice for direct replacement in existing designs without circuit modification.

Secondary Recommendation - 74LVC2G66DP,125 or 74LVC2G66DP-Q100H (Nexperia USA Inc.)

Both Nexperia parts are functionally equivalent with enhanced specifications: improved -3dB bandwidth (500MHz vs 300MHz), lower channel capacitance (5pF vs 6pF), and extended operating temperature range (-40°C ~ 125°C). The 74LVC2G66DP-Q100H includes AEC-Q100 automotive qualification, making it suitable for automotive and high-reliability applications. Package footprint compatibility requires verification due to TSSOP variant dimensions (0.118" vs 0.110" width).

Alternative Recommendation - MAX4731EUA+ or MAX4731EUA+T (Analog Devices Inc./Maxim Integrated)

These parts provide superior crosstalk performance (-108dB vs -58dB @ 1MHz) and significantly lower leakage current (100pA vs 100nA). However, they feature higher on-state resistance (25Ohm vs 10Ohm) and slower switching times (85ns/45ns vs 3.9ns/6.3ns). These characteristics make them suitable only for applications where signal integrity and low leakage are critical and where the increased resistance and switching delay are acceptable.

Alternative Recommendation - TC7W66FU,LF (Toshiba Semiconductor)

The TC7W66FU,LF is a bilateral FET switch offering wider supply voltage range (2V ~ 12V) and is suitable for applications requiring extended voltage operation. Detailed on-state resistance and switching time specifications are not provided in the datasheet parameters. This part should be selected only when the extended supply voltage range is a specific design requirement.

All recommended substitutes maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74LVC2G66DCTRG4 with SN74LVC2G66DCTR without circuit modification?

A: Yes. The SN74LVC2G66DCTR is a direct parametric equivalent with identical electrical specifications and pin configuration. No circuit modification is required. Both parts use the same SM8 package footprint.

Q: What is the difference between the Texas Instruments and Nexperia versions?

A: Both maintain the core 10Ohm on-state resistance and 1:1 switching configuration. Nexperia parts (74LVC2G66DP,125 and 74LVC2G66DP-Q100H) offer improved -3dB bandwidth (500MHz vs 300MHz), lower channel capacitance (5pF vs 6pF), and extended temperature range (-40°C ~ 125°C vs -40°C ~ 85°C). The 74LVC2G66DP-Q100H includes AEC-Q100 automotive qualification. Package dimensions differ slightly (TSSOP 0.118" vs LSSOP 0.110" width), requiring PCB footprint verification.

Q: Can I use MAX4731EUA+ as a direct replacement?

A: The MAX4731EUA+ is functionally equivalent but not a direct replacement. It features 25Ohm on-state resistance (vs 10Ohm), slower switching times (85ns/45ns vs 3.9ns/6.3ns), and higher channel capacitance (20pF vs 6pF). Use this part only if your application can tolerate increased resistance and switching delay. The superior crosstalk performance (-108dB) and lower leakage current (100pA) make it suitable for high-sensitivity analog signal switching applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL Level 1 rating, meeting standard environmental and manufacturing requirements.

Q: What is the difference between 74LVC2G66DP,125 and 74LVC2G66DP-Q100H?

A: Both parts are electrically identical with the same specifications. The primary difference is that 74LVC2G66DP-Q100H includes AEC-Q100 automotive qualification and is suitable for automotive and high-reliability applications. Select 74LVC2G66DP-Q100H if automotive qualification is required; otherwise, 74LVC2G66DP,125 is functionally equivalent.

Q: Does package type affect compatibility?

A: Package type affects PCB footprint compatibility. SN74LVC2G66DCTR uses 8-LSSOP/MSOP (0.110" width), while Nexperia parts use 8-TSSOP/MSOP (0.118" width), and Maxim parts use 8-uMAX/uSOP. Verify your PCB footprint design before selecting a substitute. Pin configuration remains consistent across all variants.

Q: What is the supply voltage range for each substitute?

A: SN74LVC2G66DCTR, 74LVC2G66DP,125, and 74LVC2G66DP-Q100H operate at 1.65V ~ 5.5V. MAX4731EUA+ and MAX4731EUA+T operate at 2V ~ 11V. TC7W66FU,LF operates at 2V ~ 12V. Select based on your application's supply voltage requirements.

Q: Which substitute offers the best performance for high-frequency applications?

A: The Nexperia parts (74LVC2G66DP,125 and 74LVC2G66DP-Q100H) offer the highest -3dB bandwidth at 500MHz with the lowest channel capacitance at 5pF, making them optimal for high-frequency signal switching applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message