NLAS4599DFT2G Equivalent & Substitute Parts

Part Overview

The NLAS4599DFT2G is a single-circuit SPDT (Single Pole Double Throw) 2:1 analog switch manufactured by onsemi, housed in a 6-TSSOP/SC-88/SOT-363 package. This component operates across a 2V to 5.5V single supply range with a maximum on-state resistance of 25Ohm and switching times of 14ns (Ton) and 8ns (Toff). The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Switch Circuit Type	SPDT
Multiplexer/Demultiplexer Configuration	2:1
Number of Circuits	1
On-State Resistance (Max)	25Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm
Supply Voltage Range (V+)	2V ~ 5.5V
Switch Time Ton (Max)	14ns
Switch Time Toff (Max)	8ns
-3dB Bandwidth	220MHz
Charge Injection	3pC
Channel Capacitance (CS(off), CD(off))	10pF, 10pF
Leakage Current (IS(off)) Max	100nA
Operating Temperature	-55°C ~ 125°C
Package Type	6-TSSOP, SC-88, SOT-363
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the NLAS4599DFT2G is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Switch circuit type: SPDT
Multiplexer configuration: 2:1
Number of circuits: 1
Package compatibility: 6-TSSOP, SC-88, SOT-363, or equivalent footprint
RoHS3 compliance
MSL rating of 1 or better

Performance Tolerance Parameters:

On-state resistance must not exceed application requirements (25Ohm baseline)
Supply voltage range must encompass or exceed 2V ~ 5.5V
Operating temperature range must cover -55°C ~ 125°C or be acceptable for the target application
Switching speed (Ton/Toff) and bandwidth must meet or exceed baseline performance

The three substitute parts listed below meet the mandatory criteria with varying performance characteristics suitable for different application constraints.

Parameter Comparison

Parameter	NLAS4599DFT2G	FSA5157L6X	ADG779BKSZ-REEL7	PI5A4599BCEX
Manufacturer	onsemi	onsemi	Analog Devices Inc.	Diodes Incorporated
Product Status	Obsolete	Active	Active	Last Time Buy
Switch Circuit	SPDT	SPDT	SPDT	SPDT
Multiplexer Configuration	2:1	2:1	2:1	2:1
On-State Resistance (Max)	25Ohm	360mOhm (Typ)	5Ohm	11Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm	40mOhm	100mOhm	150mOhm
Supply Voltage Range (V+)	2V ~ 5.5V	1.65V ~ 4.3V	1.8V ~ 5.5V	1.6V ~ 6V
Switch Time Ton (Max)	14ns	55ns	14ns	15ns
Switch Time Toff (Max)	8ns	30ns	3ns (Typ)	7ns
-3dB Bandwidth	220MHz	80MHz	200MHz	350MHz
Charge Injection	3pC	6pC	Not specified	5pC
Channel Capacitance (CS(off), CD(off))	10pF, 10pF	21pF	7pF	2.5pF
Leakage Current (IS(off)) Max	100nA	10nA	10pA (Typ)	100nA
Operating Temperature	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	6-TSSOP, SC-88, SOT-363	6-UFDFN (6-MicroPak)	6-TSSOP, SC-88, SOT-363 (SC-70-6)	6-TSSOP, SC-88, SOT-363 (SOT-363-6)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

FSA5157L6X (onsemi): This part is the manufacturer-recommended substitute with active product status. It offers superior on-state resistance (360mOhm typical) and lower leakage current (10nA), making it suitable for low-power applications. The 6-MicroPak package requires PCB layout verification for footprint compatibility. The reduced supply voltage range (1.65V ~ 4.3V) excludes the 2V minimum of the original part, and the narrower operating temperature range (-40°C ~ 85°C) does not cover the extended low-temperature specification of the NLAS4599DFT2G. This substitute is appropriate for applications operating within its specified ranges.

ADG779BKSZ-REEL7 (Analog Devices Inc.): This part maintains active product status and provides the closest electrical match to the NLAS4599DFT2G. The 5Ohm on-state resistance, 14ns Ton, and 200MHz bandwidth closely parallel the original specifications. The SC-70-6 package is footprint-compatible with the original 6-TSSOP/SC-88/SOT-363 family. The supply voltage range (1.8V ~ 5.5V) covers the original specification, though the lower limit is 0.2V higher. Operating temperature range (-40°C ~ 85°C) does not extend to the original -55°C minimum. This part is suitable for applications requiring minimal performance deviation from the original design.

PI5A4599BCEX (Diodes Incorporated): This part carries a Last Time Buy status, indicating limited future availability. It provides the lowest on-state resistance (11Ohm) and highest bandwidth (350MHz) among the substitutes, with the widest supply voltage range (1.6V ~ 6V). The SOT-363-6 package is footprint-compatible with the original. Operating temperature range (-40°C ~ 85°C) does not cover the extended low-temperature specification. This substitute is suitable for high-performance applications where extended temperature operation below -40°C is not required.

All three substitutes maintain ROHS3 compliance and MSL rating of 1, ensuring regulatory and moisture sensitivity equivalence to the original part.

Frequently Asked Questions (FAQ)

Q: Can FSA5157L6X be used as a direct drop-in replacement for NLAS4599DFT2G?

A: FSA5157L6X is electrically compatible but requires PCB layout verification. The 6-MicroPak package differs from the 6-TSSOP/SC-88/SOT-363 footprint of the original part. Additionally, the reduced supply voltage range (1.65V ~ 4.3V) excludes the 2V minimum specification of the NLAS4599DFT2G. Verify that your application operates within the FSA5157L6X supply range before implementation.

Q: Which substitute maintains the closest performance to the original NLAS4599DFT2G?

A: ADG779BKSZ-REEL7 provides the most similar electrical performance, with matching 14ns Ton specification, comparable 5Ohm on-state resistance, and 200MHz bandwidth. The SC-70-6 package is footprint-compatible with the original 6-TSSOP/SC-88/SOT-363 family. This part is recommended for designs requiring minimal circuit redesign.

Q: Are all substitutes RoHS3 compliant?

A: Yes. FSA5157L6X, ADG779BKSZ-REEL7, and PI5A4599BCEX are all ROHS3 compliant with MSL rating of 1 (Unlimited), matching the regulatory and moisture sensitivity profile of the NLAS4599DFT2G.

Q: What is the impact of operating temperature range differences?

A: The NLAS4599DFT2G operates from -55°C to 125°C. All three substitutes operate from -40°C to 85°C, a narrower range. If your application requires operation below -40°C or above 85°C, these substitutes are not suitable. Verify your application's temperature requirements before selection.

Q: Why does PI5A4599BCEX show Last Time Buy status?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this part. While currently available (6883 Pcs in stock), future availability is limited. For long-term production requirements, ADG779BKSZ-REEL7 or FSA5157L6X with Active status are preferred.

Q: How do on-state resistance differences affect circuit performance?

A: On-state resistance directly impacts signal attenuation and power dissipation. FSA5157L6X (360mOhm) provides the lowest resistance, ADG779BKSZ-REEL7 (5Ohm) and PI5A4599BCEX (11Ohm) offer moderate values, while the original NLAS4599DFT2G (25Ohm) has the highest. Lower resistance reduces signal loss in high-frequency applications. Verify that your circuit design accommodates the selected part's resistance characteristics.

Q: Are package dimensions identical between substitutes?

A: No. FSA5157L6X uses 6-MicroPak, while ADG779BKSZ-REEL7 and PI5A4599BCEX use SC-70-6 and SOT-363-6 variants respectively, all within the 6-TSSOP/SC-88/SOT-363 family. Verify PCB footprint compatibility with your design before component selection.

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