NLAS2066US Equivalent & Substitute Parts

Part Overview

The NLAS2066US is a 2-circuit SPST-NO (Single Pole Single Throw - Normally Open) IC switch manufactured by onsemi, housed in an 8-VFSOP package with 7Ohm on-state resistance. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device operates across a supply voltage range of 1.65V to 5.5V and is suitable for low-impedance switching applications requiring fast switching times and minimal crosstalk.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Number of Circuits	2
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	7Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm
Supply Voltage Range (V+)	1.65V ~ 5.5V
Switch Time (Ton, Toff) Max	3ns, 6ns
-3dB Bandwidth	186MHz
Charge Injection	7.4pC
Channel Capacitance (CS(off), CD(off))	10pF, 10pF
Current - Leakage (IS(off)) Max	1nA
Operating Temperature Range	-55°C ~ 125°C
Package / Case	8-VFSOP (0.091", 2.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the NLAS2066US is determined by the following critical parameters:

Switch circuit topology (SPST - NO configuration)
Number of circuits (2 circuits minimum)
Multiplexer/demultiplexer ratio (1:1)
Supply voltage compatibility (1.65V ~ 5.5V overlap required)
Package compatibility (8-VFSOP or equivalent footprint)
On-state resistance tolerance (maximum 10Ohm acceptable for most applications)
Operating temperature range (minimum -40°C ~ 85°C required)

Substitute parts are grouped into two categories:

Direct Equivalent (Packaging Variant): NLAS2066USG differs only in packaging format (Tape & Reel) while maintaining identical electrical specifications and the same manufacturer base product number.

Functional Equivalents (Different Manufacturers): NC7WB66K8X, 74LVC2G66DC,125, and 74LVC2G66DP,125 provide equivalent switching functionality with compatible electrical parameters and package footprints, though with variations in on-state resistance, leakage current, and bandwidth characteristics.

Parameter Comparison

Parameter	NLAS2066US	NLAS2066USG	NC7WB66K8X	74LVC2G66DC,125	74LVC2G66DP,125
Manufacturer	onsemi	onsemi	Fairchild Semiconductor	Nexperia USA Inc.	Nexperia USA Inc.
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	2	2	2	2	2
Multiplexer/Demultiplexer	1:1	1:1	1:1	1:1	1:1
On-State Resistance (Max)	7Ohm	7Ohm	10Ohm	10Ohm	10Ohm
Supply Voltage (V+)	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V
Switch Time Ton (Max)	3ns	3ns	3.2ns	3.9ns	3.9ns
Switch Time Toff (Max)	6ns	6ns	4.1ns	5ns	5ns
-3dB Bandwidth	186MHz	186MHz	300MHz	500MHz	500MHz
Charge Injection	7.4pC	7.4pC	Not specified	7.5pC	7.5pC
Channel Capacitance (CS(off), CD(off))	10pF, 10pF	10pF, 10pF	5pF	5pF	5pF
Current - Leakage (IS(off)) Max	1nA	1nA	100nA	5µA	5µA
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-VFSOP	8-VFSOP	8-VFSOP	8-VFSOP	8-TSSOP
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

NLAS2066USG is the preferred direct substitute when packaging format is the only constraint. It maintains identical electrical specifications and operating characteristics while offering ROHS3 compliance and active inventory status through Tape & Reel packaging.

NC7WB66K8X (Fairchild Semiconductor) is suitable for applications where slightly higher on-state resistance (10Ohm vs. 7Ohm) is acceptable. This part offers improved bandwidth (300MHz) and lower channel capacitance (5pF). However, the operating temperature range is limited to -40°C ~ 85°C, which may not accommodate the full -55°C lower bound of the original specification.

74LVC2G66DC,125 and 74LVC2G66DP,125 (Nexperia USA Inc.) provide the highest bandwidth performance (500MHz) and are both ROHS3 compliant with active product status. The 74LVC2G66DC,125 maintains the 8-VFSOP package footprint, while the 74LVC2G66DP,125 uses an 8-TSSOP package. Both exhibit higher leakage current (5µA) compared to the original part (1nA), which may impact low-power applications. The operating temperature range extends to -40°C ~ 125°C, covering the upper specification limit of the original part.

For new designs, prioritize active, ROHS3-compliant alternatives. For legacy system maintenance requiring exact electrical performance, NLAS2066USG is the optimal choice.

Frequently Asked Questions (FAQ)

Q: Can I use 74LVC2G66DC,125 as a direct replacement for NLAS2066US?

A: Yes, with design considerations. Both parts share identical switch topology (SPST-NO, 2 circuits, 1:1 configuration), compatible supply voltage range (1.65V ~ 5.5V), and equivalent package footprint (8-VFSOP). However, the 74LVC2G66DC,125 has higher on-state resistance (10Ohm vs. 7Ohm) and significantly higher leakage current (5µA vs. 1nA). Verify that your circuit design tolerates these parameter differences before substitution.

Q: What is the difference between NLAS2066US and NLAS2066USG?

A: These parts are electrically identical. The primary difference is packaging format: NLAS2066US is supplied in standard packaging, while NLAS2066USG is supplied in Tape & Reel (TR) format for automated assembly. NLAS2066USG also carries ROHS3 compliance certification, whereas the original NLAS2066US is RoHS non-compliant.

Q: Why does NC7WB66K8X have a lower operating temperature minimum (-40°C vs. -55°C)?

A: NC7WB66K8X is specified by Fairchild Semiconductor with an operating temperature range of -40°C ~ 85°C. If your application requires operation below -40°C, this part is not suitable. Verify your system's minimum operating temperature requirement before selecting this substitute.

Q: Which substitute part has the best high-frequency performance?

A: Both 74LVC2G66DC,125 and 74LVC2G66DP,125 offer the highest -3dB bandwidth at 500MHz, compared to 186MHz for the original NLAS2066US and 300MHz for NC7WB66K8X. These Nexperia parts are preferred for applications requiring superior high-frequency switching characteristics.

Q: Are all substitute parts RoHS compliant?

A: NLAS2066USG, 74LVC2G66DC,125, and 74LVC2G66DP,125 are all ROHS3 compliant. NC7WB66K8X compliance status is not specified in the provided data. The original NLAS2066US is RoHS non-compliant. For new designs subject to RoHS requirements, select from the compliant alternatives.

Q: What is the difference between 74LVC2G66DC,125 and 74LVC2G66DP,125?

A: Both parts are electrically identical with the same electrical specifications and ROHS3 compliance. The primary difference is the package type: 74LVC2G66DC,125 uses 8-VFSOP (0.091", 2.30mm width), while 74LVC2G66DP,125 uses 8-TSSOP (0.118", 3.00mm width). Select based on your PCB layout and assembly equipment compatibility.

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