NLAS4685FCT1 Equivalent & Substitute Parts

Part Overview

The NLAS4685FCT1 is a 2-circuit SPDT (Single Pole Double Throw) IC switch manufactured by onsemi, featuring 800mOhm on-state resistance in a 10-Microbump package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates across a 1.8V to 5.5V supply range with 30ns/25ns switching times and is suitable for general-purpose analog signal switching applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	NLAS4685FCT1
Manufacturer	onsemi
Product Status	Obsolete
Switch Circuit Configuration	SPDT
Number of Circuits	2
Multiplexer/Demultiplexer Circuit	2:1
On-State Resistance (Max)	800mOhm
Channel-to-Channel Matching (ΔRon)	60mOhm
Supply Voltage Range (V+)	1.8V ~ 5.5V
Switch Time (Ton/Toff)	30ns / 25ns
-3dB Bandwidth	11.5MHz
Operating Temperature Range	-55°C ~ 125°C
Package Type	10-UFBGA, FCBGA (10-Microbump)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the NLAS4685FCT1 is determined by the following critical parameters:

Switch Circuit Configuration: Must be SPDT
Number of Circuits: Must be 2
Multiplexer/Demultiplexer Circuit: Must be 2:1
Supply Voltage Range: Must encompass or match 1.8V ~ 5.5V
Operating Temperature Range: Must support -55°C ~ 125°C or a subset thereof
Mounting Type: Surface Mount
On-State Resistance: Acceptable range determined by application requirements (lower resistance provides better signal integrity)
Package Compatibility: Physical and electrical compatibility with 10-pin configurations

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (onsemi FSA2259UMX): Same manufacturer, identical circuit topology, different package and performance characteristics.

Category B - Cross-Manufacturer Alternatives (Analog Devices ADG787 series, NXP NX3L4684GM,115): Different manufacturers with superior performance specifications, active product status, and RoHS3 compliance.

Category C - Specialized Application (Texas Instruments TS3USB30ERSWR): USB-specific switch with different circuit topology; limited substitution applicability.

Parameter Comparison

Parameter	NLAS4685FCT1	FSA2259UMX	ADG787BCBZ-500RL7	ADG787BCBZ-REEL	ADG787BCBZ-REEL7	ADG884BCBZ-REEL7	NX3L4684GM,115
Manufacturer	onsemi	onsemi	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	NXP USA Inc.
Product Status	Obsolete	Obsolete	Active	Active	Active	Active	Active
Switch Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Number of Circuits	2	2	2	2	2	2	2
Multiplexer/Demultiplexer	2:1	2:1	2:1	2:1	2:1	2:1	2:1
On-State Resistance (Max)	800mOhm	500mOhm (Typ)	3Ohm	3Ohm	3Ohm	370mOhm	750mOhm
Channel-to-Channel Matching (ΔRon)	60mOhm	80mOhm	20mOhm	20mOhm	20mOhm	10mOhm	40mOhm
Supply Voltage Range (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
Switch Time Ton (Max)	30ns	55ns	19ns	19ns	19ns	50ns	45ns
Switch Time Toff (Max)	25ns	30ns	5ns	5ns	5ns	20ns	20ns
-3dB Bandwidth	11.5MHz	50MHz	145MHz	145MHz	145MHz	18MHz	20MHz
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 Range	-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
Package / Case	10-UFBGA, FCBGA	10-UFQFN	10-UFBGA, WLCSP	10-UFBGA, WLCSP	10-UFBGA, WLCSP	10-UFBGA, WLCSP	10-XFQFN
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Designs Requiring Extended Temperature Range (-55°C ~ 125°C):

The NX3L4684GM,115 from NXP supports the full -40°C ~ 125°C range and is the only active substitute meeting the lower temperature boundary of the original specification. This part is RoHS3 compliant and offers 750mOhm on-state resistance with active product status.

For Designs Accepting Reduced Temperature Range (-40°C ~ 85°C):

The Analog Devices ADG787BCBZ series (ADG787BCBZ-500RL7, ADG787BCBZ-REEL, ADG787BCBZ-REEL7) and ADG884BCBZ-REEL7 are active products with RoHS3 compliance. The ADG787 variants offer superior performance with 3Ohm on-state resistance, 145MHz bandwidth, and -110dB crosstalk. The ADG884BCBZ-REEL7 provides 370mOhm resistance with -120dB crosstalk performance.

For RoHS Compliance Requirements:

All substitute parts listed (except the original NLAS4685FCT1) are RoHS3 compliant. FSA2259UMX remains an onsemi option but is also obsolete. Active alternatives from Analog Devices and NXP are recommended for new designs.

For Package Compatibility Considerations:

The original NLAS4685FCT1 uses 10-Microbump (FCBGA) packaging. Substitute parts employ different package types (10-UMLP, 10-WLCSP, 10-XQFN). PCB layout and footprint redesign is required for any substitution.

Frequently Asked Questions (FAQ)

Q: Can FSA2259UMX directly replace NLAS4685FCT1?

A: FSA2259UMX shares the same SPDT 2:1 topology and onsemi manufacturer origin. However, it is also obsolete, operates at a reduced temperature range (-40°C ~ 85°C), and uses a different package (10-UMLP vs. 10-Microbump). The supply voltage range is narrower (1.65V ~ 4.4V vs. 1.8V ~ 5.5V). Substitution is functionally possible but does not resolve obsolescence.

Q: What is the primary difference between ADG787BCBZ variants?

A: ADG787BCBZ-500RL7, ADG787BCBZ-REEL, and ADG787BCBZ-REEL7 are identical in electrical specifications and package type (10-WLCSP). Differences are in packaging format (Cut Tape & Digi-Reel vs. Tape & Reel) and operating temperature range (ADG787BCBZ-REEL7 specifies -20°C ~ 85°C vs. -25°C ~ 85°C for the others). All are active products.

Q: Is the NX3L4684GM,115 suitable for applications requiring the full -55°C lower temperature limit?

A: No. The NX3L4684GM,115 operates from -40°C ~ 125°C. Applications requiring operation below -40°C cannot use this substitute. The original NLAS4685FCT1 specification of -55°C ~ 125°C cannot be fully matched by any active substitute listed.

Q: Why is TS3USB30ERSWR included if it has different circuit topology?

A: TS3USB30ERSWR is a DPDT USB-specific switch with different functional characteristics (1 channel vs. 2 circuits, 10Ohm vs. 800mOhm resistance). It is not a direct substitute for general-purpose analog switching applications. Inclusion reflects its presence in the provided substitute list but is not recommended for NLAS4685FCT1 replacement.

Q: What are the compliance and regulatory considerations for substitution?

A: The original NLAS4685FCT1 is RoHS non-compliant. All active substitute parts (ADG787 series, ADG884BCBZ-REEL7, NX3L4684GM,115) are RoHS3 compliant. All parts listed share identical REACH and ECCN classifications (REACH Unaffected, EAR99). MSL ratings are uniform at Level 1 (Unlimited) across all parts.

Q: Are there package footprint compatibility concerns?

A: Yes. The NLAS4685FCT1 uses 10-Microbump (FCBGA) packaging. Substitute parts use 10-UMLP, 10-WLCSP, or 10-XQFN packages. Each requires different PCB footprints and assembly processes. Mechanical and electrical compatibility must be verified during design transition.

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