NLAS4685FCT1G Equivalent & Substitute Parts

Part Overview

The NLAS4685FCT1G is a 2-circuit IC switch with 2:1 multiplexer/demultiplexer configuration, manufactured by onsemi. This component features 800mOhm on-state resistance, operates across 1.8V to 5.5V supply voltage, and is housed in a 10-Microbump package. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	NLAS4685FCT1G
Manufacturer	onsemi
Switch Circuit	SPDT
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	2
On-State Resistance (Max)	800mOhm
Voltage - Supply, Single (V+)	1.8V ~ 5.5V
Switch Time (Ton, Toff) (Max)	30ns, 25ns
Operating Temperature	-55°C ~ 125°C
Package / Case	10-UFBGA, FCBGA
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the NLAS4685FCT1G is determined by the following critical parameters:

Switch Circuit Configuration: SPDT topology required
Multiplexer/Demultiplexer Circuit: 2:1 configuration mandatory
Number of Circuits: 2 circuits required
Supply Voltage Range: Must encompass or be compatible with 1.8V ~ 5.5V
On-State Resistance: Maximum 800mOhm acceptable for signal integrity
Operating Temperature Range: Must support -55°C ~ 125°C or be compatible with application requirements
Mounting Type: Surface mount only
Package Compatibility: Physical and electrical compatibility with 10-pin configurations

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (onsemi FSA2259UMX): Maintains SPDT 2:1 configuration with comparable on-state resistance and operating characteristics.

Category B - Performance-Enhanced Alternatives (Analog Devices ADG787 series, Analog Devices ADG884BCBZ-REEL7, NXP NX3L4684GM,115): Provide superior electrical performance while maintaining core SPDT 2:1 functionality and supply voltage compatibility.

Category C - Application-Specific Alternative (Texas Instruments TS3USB30ERSWR): Specialized for USB switching applications with different circuit topology (DPDT) and performance characteristics.

Parameter Comparison

Parameter	NLAS4685FCT1G	FSA2259UMX	ADG787BCBZ-500RL7	ADG787BCBZ-REEL	ADG787BCBZ-REEL7	ADG884BCBZ-REEL7	NX3L4684GM,115	TS3USB30ERSWR
Manufacturer	onsemi	onsemi	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	NXP USA Inc.	Texas Instruments
Switch Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	DPDT
Multiplexer/Demultiplexer Circuit	2:1	2:1	2:1	2:1	2:1	2:1	2:1	—
Number of Circuits	2	2	2	2	2	2	2	1
On-State Resistance (Max)	800mOhm	500mOhm (Typ)	3Ohm	3Ohm	3Ohm	370mOhm	750mOhm	10Ohm
Channel-to-Channel Matching (ΔRon)	60mOhm	80mOhm	20mOhm	20mOhm	20mOhm	10mOhm	40mOhm	—
Voltage - Supply, Single (V+)	1.8V ~ 5.5V	1.65V ~ 4.4V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.4V ~ 4.3V	3V ~ 4.3V
Switch Time (Ton, Toff) (Max)	30ns, 25ns	55ns, 30ns	19ns, 5ns	19ns, 5ns	19ns, 5ns	50ns, 20ns	45ns, 20ns	—
-3dB Bandwidth	11.5MHz	50MHz	145MHz	145MHz	145MHz	18MHz	20MHz	900MHz
Charge Injection	20pC	25pC	14pC	14pC	14pC	125pC	50pC	—
Current - Leakage (IS(off)) (Max)	1µA	10nA	50pA (Typ)	50pA (Typ)	50pA (Typ)	200pA (Typ)	10nA	—
Crosstalk	-81dB @ 100kHz	-100dB @ 100kHz	-110dB @ 1MHz	-110dB @ 1MHz	-110dB @ 1MHz	-120dB @ 100kHz	-90dB @ 100kHz	—
Operating Temperature	-55°C ~ 125°C	-40°C ~ 85°C	-25°C ~ 85°C	-25°C ~ 85°C	-20°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	10-UFBGA, FCBGA	10-UFQFN	10-UFBGA, WLCSP	10-UFBGA, WLCSP	10-UFBGA, WLCSP	10-UFBGA, WLCSP	10-XFQFN	10-UFQFN
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Lowest Risk):

FSA2259UMX serves as the primary equivalent for NLAS4685FCT1G. Both are onsemi products with identical SPDT 2:1 configuration and 2-circuit topology. FSA2259UMX provides improved on-state resistance (500mOhm typical vs. 800mOhm maximum) and superior leakage characteristics (10nA vs. 1µA). However, FSA2259UMX operates at reduced temperature range (-40°C ~ 85°C vs. -55°C ~ 125°C) and lower supply voltage ceiling (4.4V vs. 5.5V). This part is also obsolete but maintains functional compatibility.

For Performance Enhancement with Extended Temperature Support:

NX3L4684GM,115 from NXP provides active product status with extended operating temperature range (-40°C ~ 125°C), matching the original part's temperature specification. On-state resistance of 750mOhm is within acceptable tolerance of the original 800mOhm specification. Supply voltage range (1.4V ~ 4.3V) is narrower than the original but covers standard logic supply levels. This part is suitable for applications requiring extended temperature operation.

For Superior Electrical Performance:

ADG787BCBZ-500RL7, ADG787BCBZ-REEL, and ADG787BCBZ-REEL7 from Analog Devices deliver significantly improved electrical characteristics: 3Ohm on-state resistance, 145MHz bandwidth, and -110dB crosstalk. All three variants are active products with ROHS3 compliance. Supply voltage compatibility spans 1.8V ~ 5.5V, matching the original specification. Operating temperature ranges vary (-25°C to -20°C minimum), which may limit use in extended low-temperature applications. Package differences (10-WLCSP vs. 10-Microbump) require PCB layout verification.

ADG884BCBZ-REEL7 from Analog Devices offers active product status with 370mOhm on-state resistance and superior crosstalk performance (-120dB @ 100kHz). Supply voltage range (1.8V ~ 5.5V) and operating temperature (-40°C ~ 85°C) provide broad compatibility. Charge injection (125pC) is elevated compared to the original (20pC), which may impact precision analog applications.

For USB-Specific Applications:

TS3USB30ERSWR from Texas Instruments is applicable only for USB switching applications. DPDT topology and 10Ohm on-state resistance differ from the original SPDT 2:1 configuration. This part is not a general-purpose substitute but serves specialized USB 2.0 switching requirements with 900MHz bandwidth and active product status.

Frequently Asked Questions (FAQ)

Q: Can FSA2259UMX directly replace NLAS4685FCT1G in all applications?

A: FSA2259UMX maintains identical SPDT 2:1 topology and 2-circuit configuration. However, verify three parameters: (1) Operating temperature range—FSA2259UMX operates -40°C ~ 85°C versus the original -55°C ~ 125°C; (2) Supply voltage ceiling—FSA2259UMX maximum is 4.4V versus 5.5V for the original; (3) On-state resistance—FSA2259UMX is 500mOhm typical, which is lower and generally favorable. Substitution is valid only if your application operates within FSA2259UMX specifications.

Q: What are the package compatibility considerations?

A: NLAS4685FCT1G uses 10-Microbump (10-UFBGA, FCBGA) packaging. Substitute parts use different packages: FSA2259UMX (10-UMLP), ADG787 series (10-WLCSP), ADG884BCBZ-REEL7 (10-WLCSP), NX3L4684GM,115 (10-XQFN), and TS3USB30ERSWR (10-UQFN). Physical dimensions and pad layouts differ. PCB redesign and re-qualification are required for any package change.

Q: Which substitute offers the best performance improvement?

A: ADG787BCBZ series (all variants) provides the most significant performance enhancement: on-state resistance reduced to 3Ohm, bandwidth increased to 145MHz, and crosstalk improved to -110dB @ 1MHz. These improvements are beneficial for high-frequency signal routing and precision analog applications. Trade-off is narrower operating temperature range (-25°C to -20°C minimum).

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts (ADG787 series, ADG884BCBZ-REEL7, NX3L4684GM,115, TS3USB30ERSWR) are ROHS3 compliant. FSA2259UMX is also ROHS3 compliant. The original NLAS4685FCT1G RoHS status is not specified in the provided data.

Q: Can I use TS3USB30ERSWR as a general substitute?

A: No. TS3USB30ERSWR is a specialized USB switch with DPDT topology and single-channel configuration, differing fundamentally from the SPDT 2:1 dual-circuit architecture of NLAS4685FCT1G. Use TS3USB30ERSWR only for USB 2.0 switching applications where its specific topology and 900MHz bandwidth are required.

Q: What is the impact of on-state resistance differences?

A: On-state resistance affects signal attenuation and power dissipation. Lower resistance (ADG787 at 3Ohm, ADG884BCBZ-REEL7 at 370mOhm) reduces signal loss and heat generation, beneficial for analog signal routing. Higher resistance (TS3USB30ERSWR at 10Ohm) is acceptable for digital switching but increases power dissipation. FSA2259UMX at 500mOhm typical provides a middle ground with improved performance over the original 800mOhm maximum.

Q: Which substitute is best for extended temperature applications?

A: NX3L4684GM,115 supports -40°C ~ 125°C operating range, matching the original NLAS4685FCT1G temperature specification. This part is the only active substitute maintaining full temperature range compatibility. All other active substitutes operate to maximum 85°C.

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