SN74LVC2G66DCUTE4 Equivalent & Substitute Parts

Part Overview

The SN74LVC2G66DCUTE4 is a 2-circuit IC switch with SPST-NO configuration manufactured by Texas Instruments. This part operates as a 1:1 multiplexer/demultiplexer with 10Ohm on-state resistance in an 8-VSSOP package. The device is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production needs.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC2G66DCUTE4
Manufacturer	Texas Instruments
Series	74LVC
Switch Circuit	SPST - NO
Number of Circuits	2
On-State Resistance (Max)	10Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm (Max)
Voltage - Supply, Single (V+)	1.65V ~ 5.5V
Switch Time (Ton, Toff) (Max)	3.9ns, 6.3ns
-3dB Bandwidth	300MHz
Channel Capacitance (CS(off), CD(off))	6pF
Current - Leakage (IS(off)) (Max)	100nA
Crosstalk	-58dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-VFSOP (0.091", 2.30mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the SN74LVC2G66DCUTE4 is determined by the following critical parameters:

Functional Requirements:

Switch circuit type: SPST - NO
Number of circuits: 2
Multiplexer/demultiplexer configuration: 1:1
On-state resistance: 10Ohm maximum

Electrical Performance:

Supply voltage range: 1.65V ~ 5.5V
Operating temperature range: -40°C ~ 85°C
Package type: 8-VFSOP (0.091", 2.30mm Width)

Compliance & Regulatory:

RoHS3 compliance
MSL Level 1
REACH unaffected status

Substitute parts must maintain these core parameters to ensure functional and mechanical compatibility. Variations in secondary parameters such as bandwidth, crosstalk, or leakage current do not preclude substitution if primary electrical and mechanical specifications are met.

Parameter Comparison

Parameter	SN74LVC2G66DCUTE4	SN74LVC2G66DCUR	SN74LVC2G66DCUT	NL7WB66USG	74LVC2G66DC,125	74LVCV2G66DC,125	TC4W66FU,LF
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	Toshiba Semiconductor
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	2	2	2	2	2	2	2
On-State Resistance (Max)	10Ohm	10Ohm	10Ohm	10Ohm	10Ohm	10Ohm	160Ohm
Voltage - Supply, Single (V+)	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	2.3V ~ 5.5V	3V ~ 18V
Switch Time (Ton, Toff) (Max)	3.9ns, 6.3ns	3.9ns, 6.3ns	3.9ns, 6.3ns	3.9ns, 6.3ns	3.9ns, 5ns	5ns, 9ns	-
-3dB Bandwidth	300MHz	300MHz	300MHz	186MHz	500MHz	210MHz	30MHz
Channel Capacitance (CS(off), CD(off))	6pF	6pF	6pF	10pF, 10pF	5pF	8pF	0.5pF, 5pF
Current - Leakage (IS(off)) (Max)	100nA	100nA	100nA	1nA	5µA	10µA	100nA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	8-VFSOP	8-VFSOP	8-VFSOP	8-VFSOP	8-VFSOP	8-VFSOP	8-TSSOP, 8-MSOP
Product Status	Discontinued	Active	Last Time Buy	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalent (Recommended): SN74LVC2G66DCUR is the preferred substitute. Manufactured by Texas Instruments, this part maintains identical electrical specifications and package configuration as the original SN74LVC2G66DCUTE4. Product status is Active with 17,400 pieces in stock, ensuring supply continuity. Packaging is available in Cut Tape and Digi-Reel formats.

Secondary Equivalent: SN74LVC2G66DCUT provides parametric equivalence with identical electrical performance. Product status is Last Time Buy with 4,300 pieces available. This option is suitable for designs with extended lead time requirements.

Manufacturer-Recommended Alternatives: 74LVC2G66DC,125 (Nexperia USA Inc.) and 74LVCV2G66DC,125 (Nexperia USA Inc.) are manufacturer-recommended substitutes. Both maintain the 10Ohm on-state resistance and 8-VFSOP package. These parts are Active status with substantial inventory availability (145,689 and 3,670 pieces respectively). The 74LVC2G66DC,125 offers enhanced bandwidth (500MHz) and faster switch time (5ns off-time). The 74LVCV2G66DC,125 operates with a minimum supply voltage of 2.3V and provides extended temperature range to 125°C.

Limited Compatibility: NL7WB66USG (onsemi) is functionally equivalent but carries Obsolete product status. This part exhibits higher channel-to-channel matching variation (15Ohm) and reduced bandwidth (186MHz). Selection should be limited to legacy system support.

TC4W66FU,LF (Toshiba Semiconductor) is not recommended as a direct substitute. The 160Ohm on-state resistance significantly exceeds the 10Ohm specification of the original part, making it unsuitable for applications requiring low-impedance switching.

Frequently Asked Questions (FAQ)

Q: Can SN74LVC2G66DCUR be used as a direct replacement for SN74LVC2G66DCUTE4? A: Yes. SN74LVC2G66DCUR is a parametric equivalent with identical electrical specifications, on-state resistance, supply voltage range, and package configuration. The only difference is packaging format (Cut Tape & Digi-Reel versus the original format) and product status (Active versus Discontinued).

Q: What is the difference between SN74LVC2G66DCUR and SN74LVC2G66DCUT? A: Both parts are Texas Instruments products with identical electrical specifications. The primary difference is packaging: SN74LVC2G66DCUR is supplied in Cut Tape and Digi-Reel format, while SN74LVC2G66DCUT is supplied in Tape & Reel format. SN74LVC2G66DCUT carries Last Time Buy status, indicating limited future availability.

Q: Are the Nexperia parts (74LVC2G66DC,125 and 74LVCV2G66DC,125) compatible with the original design? A: Both Nexperia parts maintain the critical parameters: 10Ohm on-state resistance, 2-circuit SPST-NO configuration, 8-VFSOP package, and 1.65V minimum supply voltage. The 74LVC2G66DC,125 is fully compatible. The 74LVCV2G66DC,125 has a 2.3V minimum supply voltage; verify your design operates above this threshold before selection.

Q: Why is TC4W66FU,LF not recommended as a substitute? A: The TC4W66FU,LF has a 160Ohm on-state resistance, which is 16 times higher than the 10Ohm specification of the SN74LVC2G66DCUTE4. This resistance mismatch will cause signal attenuation and performance degradation in applications requiring low-impedance switching characteristics.

Q: What is the inventory status for substitute parts? A: SN74LVC2G66DCUR has 17,400 pieces in stock (Active status). 74LVC2G66DC,125 has 145,689 pieces available (Active status). 74LVCV2G66DC,125 has 3,670 pieces in stock (Active status). SN74LVC2G66DCUT has 4,300 pieces (Last Time Buy status). NL7WB66USG has 17,200 pieces but is Obsolete.

Q: Can I use parts with different operating temperature ranges? A: The original part operates -40°C to 85°C. Nexperia alternatives (74LVC2G66DC,125 and 74LVCV2G66DC,125) extend to 125°C, which is compatible for designs operating within the original range. NL7WB66USG operates -55°C to 125°C, also compatible. Verify your application's temperature requirements before final selection.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status, matching the regulatory compliance of the original SN74LVC2G66DCUTE4.

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