74LVC2G66GD,125 Equivalent & Substitute Parts

Part Overview

The 74LVC2G66GD,125 is a 2-circuit IC switch with SPST-NO configuration manufactured by Nexperia USA Inc. This component operates as a 1:1 multiplexer/demultiplexer with 10Ohm on-state resistance and supports supply voltages from 1.65V to 5.5V. The part is classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74LVC2G66GD,125
Manufacturer	Nexperia USA Inc.
Series	74LVC
Product Status	Obsolete
Switch Circuit Type	SPST - NO
Number of Circuits	2
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	10Ohm
Supply Voltage Range (V+)	1.65V ~ 5.5V
Switch Time - Ton (Max)	3.9ns
Switch Time - Toff (Max)	5ns
-3dB Bandwidth	500MHz
Charge Injection	7.5pC
Channel Capacitance (CS(off), CD(off))	5pF
Leakage Current (IS(off)) Max	5µA
Crosstalk	-56dB @ 1MHz
Operating Temperature Range	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	8-XFDFN
Supplier Device Package	8-XSON (2x3)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the 74LVC2G66GD,125 is determined by strict equivalence across 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
Switch timing characteristics: Ton 3.9ns, Toff 5ns maximum
Bandwidth: 500MHz
Charge injection: 7.5pC
Channel capacitance: 5pF
Leakage current: 5µA maximum
Crosstalk: -56dB @ 1MHz
Operating temperature: -40°C ~ 125°C
Base product number: 74LVC2G66
Compliance: ROHS3, REACH Unaffected

Substitute parts must maintain identical electrical performance across all specified parameters. Package variations are permitted only when mechanical compatibility with the PCB layout is confirmed. All identified substitutes belong to the 74LVC2G66 base product family and share identical functional specifications.

Parameter Comparison

Parameter	74LVC2G66GD,125 (Main)	74LVC2G66DC,125	74LVC2G66GN,115	74LVC2G66GT,115
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	NXP Semiconductors
Product Status	Obsolete	Active	Active	Active
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	2	2	2	2
Multiplexer Configuration	1:1	1:1	1:1	1:1
On-State Resistance (Max)	10Ohm	10Ohm	10Ohm	10Ohm
Supply Voltage (V+)	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V
Switch Time Ton (Max)	3.9ns	3.9ns	3.9ns	3.9ns
Switch Time Toff (Max)	5ns	5ns	5ns	5ns
-3dB Bandwidth	500MHz	500MHz	500MHz	500MHz
Charge Injection	7.5pC	7.5pC	7.5pC	7.5pC
Channel Capacitance	5pF	5pF	5pF	5pF
Leakage Current (Max)	5µA	5µA	5µA	5µA
Crosstalk	-56dB @ 1MHz	-56dB @ 1MHz	-56dB @ 1MHz	-56dB @ 1MHz
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-XFDFN	8-VFSOP (0.091", 2.30mm Width)	8-XFDFN	8-XFDFN
Supplier Device Package	8-XSON (2x3)	8-VSSOP	8-XSON (1.2x1)	8-XSON, SOT833-1 (1.95x1)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All three substitute parts—74LVC2G66DC,125, 74LVC2G66GN,115, and 74LVC2G66GT,115—provide electrical equivalence to the obsolete 74LVC2G66GD,125. Selection among these alternatives depends on product availability, packaging requirements, and compliance status.

74LVC2G66DC,125 offers the highest inventory availability (145,689 pcs) and maintains Active product status with ROHS3 compliance. The 8-VSSOP package differs from the original 8-XSON footprint and requires PCB layout verification for mechanical compatibility.

74LVC2G66GN,115 maintains identical 8-XSON packaging to the original part with Active product status and ROHS3 compliance. Inventory availability is 9,660 pcs. The 8-XSON (1.2x1) variant differs in physical dimensions from the original 8-XSON (2x3) and requires footprint confirmation.

74LVC2G66GT,115 provides the highest inventory level (95,418 pcs) with Active product status. Manufacturer designation is NXP Semiconductors. The 8-XSON, SOT833-1 (1.95x1) package requires footprint verification. RoHS status is not specified in the provided data.

All substitutes maintain REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can 74LVC2G66DC,125 replace 74LVC2G66GD,125 directly on the PCB?

A: Electrical substitution is valid. However, the package change from 8-XSON (2x3) to 8-VSSOP requires PCB footprint verification. Physical dimensions and pin spacing differ between these packages. Layout compatibility must be confirmed before implementation.

Q: What is the primary reason for finding substitutes for 74LVC2G66GD,125?

A: The 74LVC2G66GD,125 is classified as Obsolete. Substitute parts with Active product status ensure long-term availability and manufacturing support.

Q: Are all substitute parts electrically identical to the original?

A: Yes. All three substitute parts maintain identical electrical specifications: 2-circuit SPST-NO configuration, 1:1 multiplexer operation, 10Ohm on-state resistance, 1.65V to 5.5V supply range, 3.9ns/5ns switching times, 500MHz bandwidth, 7.5pC charge injection, 5pF channel capacitance, 5µA leakage current, and -56dB crosstalk at 1MHz.

Q: Which substitute offers the best availability?

A: 74LVC2G66DC,125 provides the highest inventory with 145,689 pcs in stock and Active product status.

Q: Do package differences affect electrical performance?

A: No. Package variations (8-XSON vs. 8-VSSOP) do not alter electrical characteristics. However, physical footprint differences require PCB layout compatibility assessment before component selection.

Q: Are all substitutes RoHS compliant?

A: 74LVC2G66DC,125 and 74LVC2G66GN,115 are ROHS3 Compliant. RoHS status for 74LVC2G66GT,115 is not specified in the provided data.

Q: What is the operating temperature range for all parts?

A: All parts operate across -40°C to 125°C (TA), supporting industrial and extended temperature applications.

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