SN74LVC2G66DCURE4 Equivalent & Substitute Parts

Part Overview

The SN74LVC2G66DCURE4 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, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC2G66DCURE4
Manufacturer	Texas Instruments
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) (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 Range	-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 for the SN74LVC2G66DCURE4 is determined by the following critical parameters:

Switch circuit type: SPST - NO
Number of circuits: 2
Multiplexer/demultiplexer configuration: 1:1
On-state resistance: 10Ohm maximum
Supply voltage range: 1.65V ~ 5.5V
Package type: 8-VFSOP (0.091", 2.30mm Width)
Operating temperature range: -40°C ~ 85°C minimum

Substitute parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalents maintain identical electrical specifications and package configuration. These parts are direct functional replacements with the same performance characteristics.

Direct Manufacturer Alternatives provide equivalent functionality but may have minor variations in secondary parameters such as channel-to-channel matching or leakage current while maintaining core switching performance.

Manufacturer Recommended Alternatives are approved substitutes that meet the primary functional requirements but may have enhanced specifications in certain parameters such as bandwidth or operating temperature range.

Parameter Comparison

Parameter	SN74LVC2G66DCURE4	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 and Storage
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
Multiplexer Configuration	1:1	1:1	1:1	1:1	1:1	1:1	1:1
On-State Resistance (Max)	10Ohm	10Ohm	10Ohm	10Ohm	10Ohm	10Ohm	160Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm (Max)	2Ohm (Max)	2Ohm (Max)	15Ohm	-	-	4Ohm
Supply Voltage Range (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
Crosstalk	-58dB @ 1MHz	-58dB @ 1MHz	-58dB @ 1MHz	-	-56dB @ 1MHz	-55dB @ 1MHz	-50dB @ 1MHz
Operating Temperature Range	-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 (0.091", 2.30mm Width)	8-VFSOP (0.091", 2.30mm Width)	8-VFSOP (0.091", 2.30mm Width)	8-VFSOP (0.091", 2.30mm Width)	8-VFSOP (0.091", 2.30mm Width)	8-VFSOP (0.091", 2.30mm Width)	8-TSSOP, 8-MSOP (0.110", 2.80mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics	Active	Last Time Buy	Obsolete	Active	Active	Active

Engineering Selection Recommendations

SN74LVC2G66DCUR (Texas Instruments, Active) is the primary parametric equivalent. This part maintains identical electrical specifications and package configuration with active product status and 17,400 units in stock. Selection of this part ensures direct functional compatibility with the discontinued SN74LVC2G66DCURE4.

SN74LVC2G66DCUT (Texas Instruments, Last Time Buy) provides parametric equivalence with identical specifications but carries Last Time Buy status. This part is suitable for applications where Texas Instruments sourcing is required, though inventory availability is limited to 4,300 units.

74LVC2G66DC,125 (Nexperia USA Inc., Active) is a manufacturer-recommended alternative with enhanced -3dB bandwidth of 500MHz and extended operating temperature range to 125°C. This part is suitable for applications requiring higher bandwidth performance. Inventory availability is 145,689 units.

74LVCV2G66DC,125 (Nexperia USA Inc., Active) is a manufacturer-recommended alternative with extended operating temperature range to 125°C. This part has reduced minimum supply voltage of 2.3V and lower charge injection. Selection is appropriate for applications with extended temperature requirements.

NL7WB66USG (onsemi, Obsolete) carries obsolete product status and is not recommended for new designs. This part exhibits higher channel-to-channel matching variation (15Ohm) and lower -3dB bandwidth (186MHz) compared to the main part.

TC4W66FU,LF (Toshiba Semiconductor and Storage, Active) has significantly different electrical characteristics including 160Ohm on-state resistance and 30MHz bandwidth. This part is not suitable as a direct substitute due to fundamental performance differences and different package dimensions (8-TSSOP vs. 8-VFSOP).

Frequently Asked Questions (FAQ)

Q: Can SN74LVC2G66DCUR be used as a direct replacement for SN74LVC2G66DCURE4?

A: Yes. SN74LVC2G66DCUR is a parametric equivalent with identical electrical specifications, package configuration, and functional performance. The only difference is product status (Active vs. Discontinued) and packaging format (Cut Tape & Digi-Reel vs. original packaging).

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

A: Texas Instruments parts (SN74LVC2G66DCUR, SN74LVC2G66DCUT) maintain the original specifications including 300MHz bandwidth and -40°C to 85°C operating range. Nexperia parts (74LVC2G66DC,125 and 74LVCV2G66DC,125) offer extended temperature range to 125°C and enhanced bandwidth (500MHz for 74LVC2G66DC,125), making them suitable for applications with more demanding environmental requirements.

Q: Is the onsemi NL7WB66USG suitable as a substitute?

A: NL7WB66USG carries obsolete product status and exhibits performance variations including 15Ohm channel-to-channel matching (vs. 2Ohm for the main part) and 186MHz bandwidth (vs. 300MHz). This part is not recommended for new designs.

Q: Can TC4W66FU,LF replace the SN74LVC2G66DCURE4?

A: No. TC4W66FU,LF has fundamentally different electrical characteristics including 160Ohm on-state resistance (vs. 10Ohm), 30MHz bandwidth (vs. 300MHz), and different package dimensions (8-TSSOP vs. 8-VFSOP). This part is not functionally equivalent.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: switch circuit type (SPST - NO), number of circuits (2), multiplexer configuration (1:1), on-state resistance (10Ohm maximum), supply voltage range (1.65V ~ 5.5V minimum), and package type (8-VFSOP). Parts meeting these criteria are functionally compatible.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the main part.

Q: Which substitute has the best availability?

A: 74LVC2G66DC,125 (Nexperia USA Inc.) has the highest inventory availability at 145,689 units in stock, followed by SN74LVC2G66DCUR (Texas Instruments) at 17,400 units.

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