NLAS4501DFT2G Equivalent & Substitute Parts

Part Overview

The NLAS4501DFT2G is a single-circuit SPST-NO (Normally Open) analog switch manufactured by onsemi, designed for signal routing and multiplexing applications in the 2V to 5.5V supply range. This component features a 25Ohm on-state resistance, 220MHz bandwidth, and SC-70-5 (SOT-353) surface mount packaging. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO (Single Pole Single Throw - Normally Open)
Number of Circuits	1
On-State Resistance (Max)	25Ohm
Supply Voltage Range	2V ~ 5.5V (Single Supply)
Switch Time (Ton/Toff)	9ns / 10ns
-3dB Bandwidth	220MHz
Charge Injection	3pC
Channel Capacitance (Off-State)	10pF
Leakage Current (Max)	1nA
Operating Temperature	-55°C ~ 125°C
Package Type	5-TSSOP / SC-70-5 / SOT-353
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the NLAS4501DFT2G is determined by the following critical parameters:

Primary Substitution Criteria:

Switch circuit configuration: SPST - NO topology
Single circuit (1:1 multiplexer/demultiplexer)
Package compatibility: 5-TSSOP / SC-70-5 / SOT-353 surface mount
Supply voltage range: Minimum 2V to 5.5V operation
On-state resistance: Functionally equivalent range (10Ohm to 900mOhm acceptable depending on application requirements)

Secondary Compatibility Factors:

Operating temperature range: Must support -40°C minimum (original supports -55°C)
Bandwidth: Minimum 200MHz for signal integrity
Leakage current: Maximum 100nA for low-power applications

Substitutes are grouped into three categories based on on-state resistance characteristics: low-resistance variants (10Ohm), mid-range variants (22Ohm to 25Ohm), and high-resistance variants (220mOhm to 900mOhm). Selection depends on specific circuit impedance requirements.

Parameter Comparison

Part Number	Manufacturer	On-State Resistance	Supply Voltage	Switch Time (Ton/Toff)	Bandwidth	Operating Temp	Package	Status
NLAS4501DFT2G	onsemi	25Ohm	2V ~ 5.5V	9ns / 10ns	220MHz	-55°C ~ 125°C	SC-70-5	Obsolete
NLAST4501DFT2G	onsemi	25Ohm	2V ~ 5.5V	9ns / 10ns	220MHz	-55°C ~ 125°C	SC-70-5	Obsolete
SN74LVC1G66DCKT	Texas Instruments	10Ohm	1.65V ~ 5.5V	4.2ns / 5ns	300MHz	-40°C ~ 85°C	SC-70-5	Last Time Buy
74AHC1G66GW-Q100H	Nexperia USA Inc.	22Ohm	2V ~ 5.5V	11ns / 11ns	280MHz	-40°C ~ 125°C	5-TSSOP	Active
74HCT1G66GW-Q100H	Nexperia USA Inc.	95Ohm	4.5V ~ 5.5V	30ns / 44ns	200MHz	-40°C ~ 125°C	5-TSSOP	Active
ISL43L110IHZ-T	Renesas Electronics	220mOhm (Typ)	1.1V ~ 4.5V	15ns / 10ns	Not specified	-40°C ~ 85°C	SC-70-5	Active
TS5A3166QDCKRQ1	Texas Instruments	900mOhm	1.65V ~ 5.5V	7ns / 11.5ns	200MHz	-40°C ~ 125°C	SC-70-5	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): NLAST4501DFT2G is a parametric equivalent with identical electrical characteristics and package type. Both parts are obsolete; however, NLAST4501DFT2G offers the same performance envelope.

For Active Production (Recommended Primary Substitutes):

74AHC1G66GW-Q100H (Nexperia) is the preferred substitute for new designs. It maintains the 2V to 5.5V supply range, delivers comparable on-state resistance (22Ohm vs. 25Ohm), and is actively manufactured with AEC-Q100 automotive qualification. Operating temperature extends to 125°C, matching the original specification.

TS5A3166QDCKRQ1 (Texas Instruments) is suitable for applications tolerating higher on-state resistance (900mOhm). It supports the full -40°C to 125°C temperature range, includes AEC-Q100 qualification, and maintains 200MHz bandwidth. This part is actively produced and widely available.

For Extended Supply Voltage Range: SN74LVC1G66DCKT (Texas Instruments) operates from 1.65V, extending low-voltage capability. It features superior on-state resistance (10Ohm) and 300MHz bandwidth. Product status is Last Time Buy; inventory availability should be verified before design commitment.

For Low-Voltage Applications: ISL43L110IHZ-T (Renesas) supports operation from 1.1V with minimal on-state resistance (220mOhm typical). Operating temperature is limited to -40°C to 85°C. This part is actively manufactured and suitable for battery-powered applications.

For Restricted Supply Voltage (4.5V to 5.5V Only): 74HCT1G66GW-Q100H (Nexperia) is limited to 4.5V minimum supply but offers AEC-Q100 qualification and active production status. Use only when supply voltage is guaranteed above 4.5V.

Frequently Asked Questions (FAQ)

Q: Can NLAST4501DFT2G directly replace NLAS4501DFT2G? A: Yes. NLAST4501DFT2G is a parametric equivalent with identical electrical specifications, on-state resistance (25Ohm), supply voltage range (2V to 5.5V), and SC-70-5 package. The only difference is packaging format (Cut Tape vs. Tape & Reel). Both parts are obsolete.

Q: What is the primary difference between the substitute parts? A: Substitutes differ primarily in on-state resistance and supply voltage range. SN74LVC1G66DCKT offers the lowest resistance (10Ohm) and widest voltage range (1.65V to 5.5V). 74AHC1G66GW-Q100H maintains the original 2V to 5.5V range with comparable 22Ohm resistance. TS5A3166QDCKRQ1 and ISL43L110IHZ-T feature higher resistance values suitable for different impedance requirements.

Q: Are all substitutes available in the same package? A: Yes. All listed substitutes use 5-TSSOP / SC-70-5 / SOT-353 surface mount packaging, ensuring PCB layout compatibility. Pin configurations are identical for SPST-NO switch topology.

Q: Which substitute is recommended for automotive applications? A: 74AHC1G66GW-Q100H and TS5A3166QDCKRQ1 both carry AEC-Q100 automotive qualification. 74AHC1G66GW-Q100H is preferred for designs requiring 2V to 5.5V operation with 22Ohm resistance. TS5A3166QDCKRQ1 is suitable when higher on-state resistance (900mOhm) is acceptable.

Q: What is the impact of on-state resistance differences on circuit performance? A: On-state resistance affects signal attenuation and power dissipation. Lower resistance (10Ohm to 25Ohm) minimizes signal loss in high-frequency applications. Higher resistance (220mOhm to 900mOhm) increases voltage drop across the switch and is suitable for low-current signal routing where impedance matching is less critical.

Q: Can I use 74HCT1G66GW-Q100H if my supply voltage is 3.3V? A: No. 74HCT1G66GW-Q100H requires minimum 4.5V supply voltage. Use 74AHC1G66GW-Q100H, SN74LVC1G66DCKT, or TS5A3166QDCKRQ1 for 3.3V operation.

Q: What is the difference between Last Time Buy and Active product status? A: Last Time Buy (SN74LVC1G66DCKT) indicates the manufacturer will cease production after a specified date. Active status (74AHC1G66GW-Q100H, TS5A3166QDCKRQ1, ISL43L110IHZ-T) indicates ongoing production and long-term availability. For new designs, prioritize Active status parts.

Q: Does operating temperature range affect substitution suitability? A: Yes. The original NLAS4501DFT2G operates from -55°C to 125°C. Most substitutes operate from -40°C to 125°C, which is acceptable for most industrial and automotive applications. ISL43L110IHZ-T is limited to -40°C to 85°C and should be used only when this range is sufficient.

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