NLVAS4599DFT2G Equivalent & Substitute Parts

Part Overview

The NLVAS4599DFT2G is a single-circuit SPDT (Single Pole Double Throw) analog switch manufactured by onsemi, designed for 2:1 multiplexing applications with 25Ohm on-state resistance. This component operates across a 2V to 5.5V single supply range and is qualified to AEC-Q100 automotive standards. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Switch Circuit Type	SPDT
Multiplexer Configuration	2:1
Number of Circuits	1
On-State Resistance (Max)	25Ohm
Supply Voltage Range	2V ~ 5.5V (Single Supply)
Operating Temperature	-55°C ~ 125°C
Package Type	6-TSSOP / SC-88 / SOT-363
Automotive Grade	AEC-Q100 Qualified
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the NLVAS4599DFT2G is determined by the following mandatory criteria:

Switch circuit topology: SPDT configuration required
Multiplexer function: 2:1 multiplexing capability
Single supply operation: 2V minimum to 5.5V maximum voltage range compatibility
Package compatibility: 6-TSSOP / SC-88 / SOT-363 footprint
Regulatory compliance: RoHS3 compliance and MSL Level 1 rating

The identified substitute parts meet these core functional and physical requirements. Variations in on-state resistance, switching speed, and bandwidth reflect different design implementations within the same functional class and do not preclude substitution where application requirements permit.

Parameter Comparison

Parameter	NLVAS4599DFT2G	MAX4599EXT+T	PI5A4599BCEX
Manufacturer	onsemi	Analog Devices Inc./Maxim Integrated	Diodes Incorporated
Switch Circuit	SPDT	SPDT	SPDT
Multiplexer Configuration	2:1	2:1	2:1
Number of Circuits	1	1	1
On-State Resistance (Max)	25Ohm	60Ohm	11Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm	200mOhm	150mOhm
Supply Voltage Range	2V ~ 5.5V	2V ~ 5.5V	1.6V ~ 6V
Switch Time Ton (Max)	14ns	30ns	15ns
Switch Time Toff (Max)	8ns	25ns	7ns
-3dB Bandwidth	220MHz	200MHz	350MHz
Charge Injection	3pC	3pC	5pC
Channel Capacitance (CS(off), CD(off))	10pF, 10pF	8pF, 8pF	2.5pF
Current - Leakage (IS(off)) (Max)	100nA	500pA	100nA
Operating Temperature	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Last Time Buy
Package / Case	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363	6-TSSOP, SC-88, SOT-363
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

MAX4599EXT+T is an active production alternative from Analog Devices Inc./Maxim Integrated with identical supply voltage range compatibility. This part maintains ROHS3 compliance and MSL Level 1 rating. The higher on-state resistance (60Ohm versus 25Ohm) and extended switching times represent the primary electrical trade-offs. This substitute is suitable for applications where the increased resistance and slower switching characteristics are acceptable within system performance margins.

PI5A4599BCEX is classified as Last Time Buy status from Diodes Incorporated and offers superior electrical performance characteristics, including lower on-state resistance (11Ohm), faster switching times, and higher bandwidth (350MHz). The extended supply voltage range (1.6V to 6V) provides additional operational flexibility. However, the Last Time Buy status indicates limited future availability. This substitute is optimal for new designs where performance advantages justify the supply chain considerations.

For automotive applications requiring AEC-Q100 qualification continuity, MAX4599EXT+T provides the most direct path forward as an active production part with established supply channels.

Frequently Asked Questions (FAQ)

Q: Can MAX4599EXT+T directly replace NLVAS4599DFT2G in existing designs?

A: Electrical substitution is feasible where application requirements accommodate the higher on-state resistance (60Ohm versus 25Ohm) and extended switching times (30ns/25ns versus 14ns/8ns). Physical footprint compatibility is confirmed across the 6-TSSOP/SC-88/SOT-363 package family. Circuit validation is required to confirm performance adequacy.

Q: What are the key differences between PI5A4599BCEX and the original NLVAS4599DFT2G?

A: PI5A4599BCEX provides superior electrical performance with lower on-state resistance (11Ohm), faster switching response, and higher bandwidth (350MHz). The extended supply voltage range (1.6V to 6V) offers broader operational compatibility. The Last Time Buy status requires consideration for long-term production planning.

Q: Are all substitute parts compatible with the same PCB footprint?

A: All identified substitutes utilize the 6-TSSOP/SC-88/SOT-363 package family and are compatible with existing PCB layouts designed for NLVAS4599DFT2G.

Q: Which substitute is recommended for new automotive designs?

A: MAX4599EXT+T is recommended for new automotive designs due to active production status, established supply availability, and maintained ROHS3 compliance. Design validation is required to confirm on-state resistance and switching time performance margins.

Q: What is the significance of Last Time Buy status for PI5A4599BCEX?

A: Last Time Buy status indicates that Diodes Incorporated will discontinue production after a specified date. This part remains suitable for existing production runs but is not recommended for new long-term production commitments without confirmed extended availability.

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