NLAS323USG Equivalent & Substitute Parts

Part Overview

The NLAS323USG is a 2-circuit SPST-NO (Single Pole Single Throw - Normally Open) IC switch manufactured by onsemi, housed in an 8-VFSOP package with 25Ohm on-state resistance. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. Substitute parts must maintain compatibility across switching topology, circuit count, package form factor, and electrical performance within specified operating ranges.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Multiplexer/Demultiplexer Circuit	1:1
Number of Circuits	2
On-State Resistance (Max)	25Ohm
Voltage - Supply, Single (V+)	2V ~ 5.5V
Package / Case	8-VFSOP (0.091", 2.30mm Width)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C (TA)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the NLAS323USG is determined by the following mandatory parameters:

Switch Topology: SPST - NO configuration with 1:1 multiplexer/demultiplexer circuit
Circuit Count: Exactly 2 circuits
Package Compatibility: 8-VFSOP form factor (0.091", 2.30mm Width)
Supply Voltage Range: Must encompass or be contained within 2V ~ 5.5V
On-State Resistance: Substitute resistance must not exceed application requirements; lower resistance values are acceptable
Surface Mount: Identical mounting technology
Operating Temperature: Must support -55°C ~ 125°C range or be suitable for the application's actual operating window

The identified substitute parts (74LVC2G66DC-Q100H and SN74LVC2G66QDCURQ1) satisfy all mandatory substitution criteria. Both are 2-circuit SPST-NO switches in 8-VFSOP packages with supply voltage ranges compatible with the original specification.

Parameter Comparison

Parameter	NLAS323USG (Main)	74LVC2G66DC-Q100H	SN74LVC2G66QDCURQ1
Manufacturer	onsemi	Nexperia USA Inc.	Texas Instruments
Switch Circuit	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	2	2	2
On-State Resistance (Max)	25Ohm	10Ohm	15Ohm
Voltage - Supply, Single (V+)	2V ~ 5.5V	1.65V ~ 5.5V	1.65V ~ 5.5V
Switch Time (Ton, Toff) (Max)	9ns, 10ns	3.9ns, 5ns	5.9ns, 8.3ns
-3db Bandwidth	220MHz	500MHz	300MHz
Charge Injection	3pC	7.5pC	Not specified
Channel Capacitance (CS(off), CD(off))	10pF, 10pF	5pF	6pF
Current - Leakage (IS(off)) (Max)	1nA	5µA	100nA
Operating Temperature	-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)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both substitute parts are active products with full manufacturing support, addressing the obsolescence status of the NLAS323USG.

74LVC2G66DC-Q100H (Nexperia USA Inc.):

Lowest on-state resistance at 10Ohm, providing superior signal integrity and reduced power dissipation
Fastest switching performance (3.9ns, 5ns)
Highest bandwidth (500MHz)
Lowest channel capacitance (5pF)
AEC-Q100 automotive qualification
Higher leakage current (5µA) compared to the original
Operating temperature range -40°C ~ 125°C (does not extend to -55°C)

SN74LVC2G66QDCURQ1 (Texas Instruments):

Moderate on-state resistance at 15Ohm, balancing performance and power characteristics
Intermediate switching performance (5.9ns, 8.3ns)
Moderate bandwidth (300MHz)
Channel capacitance of 6pF
AEC-Q100 automotive qualification
Leakage current of 100nA, closer to the original specification
Operating temperature range -40°C ~ 125°C (does not extend to -55°C)

Selection between these substitutes depends on application requirements for on-state resistance, switching speed, and leakage current. Both are suitable for applications operating within -40°C ~ 125°C. Applications requiring -55°C operation require design review.

Frequently Asked Questions (FAQ)

Q: Can the 74LVC2G66DC-Q100H directly replace the NLAS323USG?

A: Yes, for applications operating within -40°C ~ 125°C. The 10Ohm on-state resistance is lower than the original 25Ohm specification, which is acceptable and improves performance. The 8-VFSOP package is identical. Verify that the lower leakage current (5µA vs. 1nA) does not affect circuit operation.

Q: What is the primary difference between the two substitute parts?

A: The 74LVC2G66DC-Q100H has lower on-state resistance (10Ohm) and faster switching times, while the SN74LVC2G66QDCURQ1 has higher on-state resistance (15Ohm) and leakage current closer to the original part. Both are functionally equivalent SPST-NO 2-circuit switches in identical packages.

Q: Do the substitute parts support the full -55°C ~ 125°C operating range of the original?

A: No. Both substitutes are specified for -40°C ~ 125°C. Applications requiring -55°C operation must evaluate alternative solutions or conduct thermal testing within the specified range.

Q: Are the substitute parts RoHS and REACH compliant?

A: Yes. Both 74LVC2G66DC-Q100H and SN74LVC2G66QDCURQ1 are ROHS3 Compliant and REACH Unaffected, matching the original part's compliance status.

Q: What is the significance of the lower leakage current in the SN74LVC2G66QDCURQ1?

A: The SN74LVC2G66QDCURQ1 leakage current of 100nA is closer to the original 1nA specification, making it preferable for low-power or high-impedance applications. The 74LVC2G66DC-Q100H at 5µA may require circuit evaluation for power-sensitive designs.

Q: Are both substitutes automotive-qualified?

A: Yes. Both parts carry AEC-Q100 qualification and automotive-grade designation, suitable for automotive applications.

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