SN74LVC2G66DCUTG4 Equivalent & Substitute Parts

Part Overview

The SN74LVC2G66DCUTG4 is a 2-circuit IC switch with SPST-NO configuration, 10Ohm on-state resistance, and 8-VSSOP packaging manufactured by Texas Instruments. This part operates across a supply voltage range of 1.65V to 5.5V and is designed for low-voltage switching applications requiring fast switching times and minimal crosstalk. The product status is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74LVC2G66DCUTG4
Manufacturer	Texas Instruments
Series	74LVC
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)
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)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74LVC2G66DCUTG4 is determined by the following critical parameters:

Switch Circuit Type: SPST - NO (required match)
Number of Circuits: 2 (required match)
Multiplexer/Demultiplexer Configuration: 1:1 (required match)
On-State Resistance (Max): 10Ohm (required match)
Voltage - Supply, Single (V+): 1.65V ~ 5.5V (required match or superset)
Package / Case: 8-VFSOP form factor (required match)
Mounting Type: Surface Mount (required match)

Substitute parts are classified into three categories:

Parametric Equivalent: Parts with identical electrical specifications and packaging, differing only in product status or packaging format (tape & reel vs. cut tape).

Direct Manufacturer Alternative: Parts from different manufacturers meeting the same electrical and mechanical requirements, with minor variations in secondary parameters such as channel-to-channel matching or crosstalk performance.

MFR Recommended Alternative: Parts recommended by manufacturers as direct replacements, offering enhanced performance in specific parameters while maintaining core functional compatibility.

Parameter Comparison

Parameter	SN74LVC2G66DCUTG4	SN74LVC2G66DCUR	SN74LVC2G66DCUT	NL7WB66USG	74LVC2G66DC,125	74LVCV2G66DC,125
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	onsemi	Nexperia USA Inc.	Nexperia USA Inc.
Product Status	Discontinued at DiGi Electronics	Active	Last Time Buy	Obsolete	Active	Active
Switch Circuit Type	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	2	2	2	2	2	2
Multiplexer/Demultiplexer Configuration	1:1	1:1	1:1	1:1	1:1	1:1
On-State Resistance (Max)	10Ohm	10Ohm	10Ohm	10Ohm	10Ohm	10Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm (Max)	2Ohm (Max)	2Ohm (Max)	15Ohm	-	-
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
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
Channel Capacitance (CS(off), CD(off))	6pF	6pF	6pF	10pF, 10pF	5pF	8pF
Current - Leakage (IS(off)) (Max)	100nA	100nA	100nA	1nA	5µA	10µA
Crosstalk	-58dB @ 1MHz	-58dB @ 1MHz	-58dB @ 1MHz	-	-56dB @ 1MHz	-55dB @ 1MHz
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-55°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)
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)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	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)

Engineering Selection Recommendations

Primary Recommendation: SN74LVC2G66DCUR

The SN74LVC2G66DCUR from Texas Instruments is the optimal substitute for the discontinued SN74LVC2G66DCUTG4. This part maintains identical electrical specifications, including on-state resistance, switching times, bandwidth, and crosstalk performance. The part is currently in active production status with 17,400 units in stock, ensuring long-term availability. Both parts are ROHS3 compliant with MSL 1 rating and identical operating temperature ranges of -40°C to 85°C. The only difference is packaging format: SN74LVC2G66DCUR is supplied in Cut Tape (CT) & Digi-Reel format, while the original part was in a different packaging variant.

Secondary Recommendation: SN74LVC2G66DCUT

The SN74LVC2G66DCUT provides parametric equivalence with identical electrical performance. This part is supplied in Tape & Reel (TR) format and carries a Last Time Buy status, indicating limited future availability. It maintains all critical specifications matching the original part and is suitable for applications where tape & reel packaging is preferred for automated assembly processes.

Alternative Recommendation: 74LVC2G66DC,125 (Nexperia USA Inc.)

The 74LVC2G66DC,125 from Nexperia USA Inc. is a manufacturer-recommended alternative with enhanced performance characteristics. This part offers superior -3dB bandwidth (500MHz vs. 300MHz) and faster Toff switching time (5ns vs. 6.3ns). It maintains the same on-state resistance and supply voltage range. The part is in active production with 145,689 units in stock and supports extended operating temperature range (-40°C to 125°C). This option is suitable for applications requiring higher bandwidth performance while maintaining core functional compatibility.

Not Recommended: NL7WB66USG (onsemi)

The NL7WB66USG from onsemi is classified as obsolete and does not meet substitution criteria due to degraded channel-to-channel matching (15Ohm vs. 2Ohm maximum) and reduced -3dB bandwidth (186MHz vs. 300MHz). While it maintains the same on-state resistance and supply voltage range, the obsolete status and inferior performance characteristics make this part unsuitable for new designs or long-term procurement.

Conditional Alternative: 74LVCV2G66DC,125 (Nexperia USA Inc.)

The 74LVCV2G66DC,125 is suitable only for applications where the minimum supply voltage requirement can be increased to 2.3V (vs. 1.65V for the original part). This part offers extended operating temperature range (-40°C to 125°C) and is in active production. However, the reduced minimum supply voltage and slower switching times (5ns, 9ns vs. 3.9ns, 6.3ns) limit its applicability to designs with higher voltage headroom and less stringent timing requirements.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74LVC2G66DCUTG4 with SN74LVC2G66DCUR without circuit modifications?

A: Yes. The SN74LVC2G66DCUR is a parametric equivalent with identical electrical specifications, on-state resistance, switching times, and operating temperature range. Both parts use the same 8-VFSOP package and surface mount configuration. No circuit modifications are required.

Q: What is the difference between SN74LVC2G66DCUR and SN74LVC2G66DCUT?

A: Both parts are parametric equivalents from Texas Instruments with identical electrical specifications. The primary difference is packaging format: SN74LVC2G66DCUR is supplied in Cut Tape (CT) & Digi-Reel format, while SN74LVC2G66DCUT is supplied in Tape & Reel (TR) format. SN74LVC2G66DCUR is in active production, while SN74LVC2G66DCUT carries Last Time Buy status.

Q: Why is the NL7WB66USG not recommended as a substitute?

A: The NL7WB66USG from onsemi has an obsolete product status and exhibits degraded performance in critical parameters. The channel-to-channel matching is 15Ohm (maximum) compared to 2Ohm for the original part, and the -3dB bandwidth is reduced to 186MHz versus 300MHz. These performance degradations make it unsuitable for applications requiring the original part's specifications.

Q: Can I use 74LVC2G66DC,125 in place of the original part?

A: Yes, with the understanding that this Nexperia part offers enhanced performance. The 74LVC2G66DC,125 maintains the same on-state resistance and supply voltage range (1.65V ~ 5.5V) but provides superior -3dB bandwidth (500MHz vs. 300MHz) and faster Toff switching time (5ns vs. 6.3ns). It supports extended operating temperature range (-40°C to 125°C) and is in active production with high inventory availability.

Q: What are the supply voltage constraints when selecting a substitute?

A: The original SN74LVC2G66DCUTG4 operates across 1.65V to 5.5V. Substitute parts must support this range or a superset of it. The 74LVCV2G66DC,125 has a minimum supply voltage of 2.3V, making it unsuitable for applications requiring operation below 2.3V. The SN74LVC2G66DCUR, SN74LVC2G66DCUT, NL7WB66USG, and 74LVC2G66DC,125 all support the full 1.65V to 5.5V range.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed—SN74LVC2G66DCUR, SN74LVC2G66DCUT, NL7WB66USG, 74LVC2G66DC,125, and 74LVCV2G66DC,125—are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the original part's compliance status.

Q: Which substitute offers the best long-term availability?

A: The 74LVC2G66DC,125 from Nexperia USA Inc. offers the highest inventory availability with 145,689 units in stock and active production status. The SN74LVC2G66DCUR from Texas Instruments is the second choice with 17,400 units in stock and active status. Both parts are suitable for long-term procurement strategies.

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