NLAS4501DFT2 Equivalent & Substitute Parts

Part Overview

The NLAS4501DFT2 is a single-circuit SPST-NO (Single Pole Single Throw - Normally Open) IC switch manufactured by onsemi, housed in a 5-TSSOP (SC-70-5/SOT-353) package. This component features a 25Ohm on-state resistance and operates across a 2V to 5.5V supply voltage range, making it suitable for low-voltage signal switching applications. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Multiplexer/Demultiplexer Circuit	1:1
Number of Circuits	1
On-State Resistance (Max)	25Ohm
Voltage - Supply, Single (V+)	2V ~ 5.5V
Switch Time (Ton, Toff) (Max)	9ns, 10ns
-3dB Bandwidth	220MHz
Charge Injection	3pC
Channel Capacitance (CS(off), CD(off))	10pF, 10pF
Current - Leakage (IS(off)) (Max)	1nA
Operating Temperature	-55°C ~ 125°C (TA)
Package / Case	5-TSSOP, SC-70-5, SOT-353
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the NLAS4501DFT2 is determined by the following critical parameters:

Switch Circuit Configuration: SPST - NO topology with 1:1 multiplexer/demultiplexer circuit
Package Compatibility: 5-TSSOP, SC-70-5, SOT-353 form factor
On-State Resistance: Maximum 25Ohm specification
Supply Voltage Range: 2V ~ 5.5V operation
Switching Performance: Ton/Toff specifications of 9ns/10ns maximum
Bandwidth: 220MHz -3dB bandwidth minimum
Leakage Current: 1nA maximum specification
Operating Temperature: -55°C ~ 125°C range

Substitute parts are grouped into two categories:

Parametric Equivalent: NLAST4501DFT2G matches all electrical specifications identically, differing only in packaging format (Cut Tape vs. standard packaging) and RoHS compliance status (ROHS3 Compliant).

Similar Functional Alternatives: 74AHC1G66GW-Q100H, 74HCT1G66GW-Q100H, ISL43L110IHZ-T, and TS5A3166QDCKRQ1 provide SPST-NO switching functionality in compatible packages with variations in on-state resistance, supply voltage ranges, switching times, and product status (Active vs. Obsolete).

Parameter Comparison

Parameter	NLAS4501DFT2	NLAST4501DFT2G	74AHC1G66GW-Q100H	74HCT1G66GW-Q100H	ISL43L110IHZ-T	TS5A3166QDCKRQ1
Manufacturer	onsemi	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	Renesas Electronics Corporation	Texas Instruments
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO	SPST - NO
Multiplexer/Demultiplexer	1:1	1:1	1:1	1:1	1:1	1:1
Number of Circuits	1	1	1	1	1	1
On-State Resistance (Max)	25Ohm	25Ohm	22Ohm	95Ohm	220mOhm (Typ)	900mOhm
Voltage - Supply, Single (V+)	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	4.5V ~ 5.5V	1.1V ~ 4.5V	1.65V ~ 5.5V
Switch Time Ton (Max)	9ns	9ns	11ns	30ns	15ns	7ns
Switch Time Toff (Max)	10ns	10ns	11ns	44ns	10ns	11.5ns
-3dB Bandwidth	220MHz	220MHz	280MHz	200MHz	-	200MHz
Charge Injection	3pC	3pC	-	-	89pC	1pC
Channel Capacitance (CS(off), CD(off))	10pF, 10pF	10pF, 10pF	10pF	-	68pF	19pF, 18pF
Current - Leakage (IS(off)) (Max)	1nA	1nA	100nA	1µA	30nA	80nA
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	5-TSSOP, SC-70-5, SOT-353	5-TSSOP, SC-70-5, SOT-353	5-TSSOP, SC-70-5, SOT-353	5-TSSOP, SC-70-5, SOT-353	5-TSSOP, SC-70-5, SOT-353	5-TSSOP, SC-70-5, SOT-353
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)
Grade	-	-	Automotive	Automotive	-	Automotive
Qualification	-	-	AEC-Q100	AEC-Q100	-	AEC-Q100

Engineering Selection Recommendations

NLAST4501DFT2G is the direct parametric equivalent, offering identical electrical specifications and package compatibility. This part is preferred for designs requiring exact performance matching. The primary advantage is ROHS3 compliance, addressing regulatory requirements absent in the original NLAS4501DFT2. Both parts carry obsolete status, indicating limited future availability.

74AHC1G66GW-Q100H (Nexperia) provides active product status with superior on-state resistance (22Ohm vs. 25Ohm) and higher bandwidth (280MHz vs. 220MHz). This part qualifies for automotive applications under AEC-Q100 and maintains full RoHS3 compliance. The slightly lower leakage current (100nA vs. 1nA) and comparable switching times make it suitable for applications where active product support and automotive qualification are required.

TS5A3166QDCKRQ1 (Texas Instruments) offers active product status with the lowest charge injection (1pC) and fastest Ton switching time (7ns). This part supports the widest supply voltage range (1.65V ~ 5.5V) and carries automotive qualification (AEC-Q100). The higher on-state resistance (900mOhm) and leakage current (80nA) require circuit-level evaluation for compatibility.

74HCT1G66GW-Q100H (Nexperia) is suitable only for applications operating at 4.5V ~ 5.5V supply voltages, as its lower supply range excludes 2V ~ 3.3V operation. The significantly higher on-state resistance (95Ohm) and slower switching times (30ns/44ns) limit applicability to lower-speed switching requirements.

ISL43L110IHZ-T (Renesas) operates at the lowest supply voltage (1.1V minimum) but has the highest on-state resistance (220mOhm typical) and operates only to 85°C maximum temperature. The elevated charge injection (89pC) and channel capacitance (68pF) may impact high-frequency performance. MSL rating of 2 requires stricter moisture control during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can NLAST4501DFT2G be used as a direct replacement for NLAS4501DFT2?

A: Yes. NLAST4501DFT2G is a parametric equivalent with identical electrical specifications, package form factor, and operating characteristics. The primary differences are packaging format (Cut Tape) and RoHS3 compliance status. Both parts are classified as obsolete.

Q: What is the key difference between the onsemi parts (NLAS4501DFT2 and NLAST4501DFT2G) and the active alternatives?

A: The onsemi parts are obsolete with no future manufacturing planned. Active alternatives (74AHC1G66GW-Q100H, TS5A3166QDCKRQ1, 74HCT1G66GW-Q100H) are currently produced and supported by their respective manufacturers. Active parts provide long-term availability and supply chain stability.

Q: Which substitute part has the best on-state resistance performance?

A: ISL43L110IHZ-T offers the lowest on-state resistance at 220mOhm (typical), followed by TS5A3166QDCKRQ1 at 900mOhm. However, these lower resistances come with trade-offs in other parameters such as charge injection, capacitance, and operating temperature range.

Q: Are all substitute parts compatible with 2V ~ 5.5V supply voltage operation?

A: No. 74HCT1G66GW-Q100H operates only at 4.5V ~ 5.5V, excluding 2V ~ 3.3V operation. ISL43L110IHZ-T operates at 1.1V ~ 4.5V, excluding 5V operation. Only NLAST4501DFT2G, 74AHC1G66GW-Q100H, and TS5A3166QDCKRQ1 support the full 2V ~ 5.5V range.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?

A: MSL 1 (Unlimited) indicates the part can be stored indefinitely without moisture baking requirements. ISL43L110IHZ-T carries MSL 2 (1 Year), requiring moisture baking before reflow soldering if storage exceeds one year. This affects handling procedures and shelf-life management.

Q: Do all substitute parts carry automotive qualification?

A: No. Only 74AHC1G66GW-Q100H, 74HCT1G66GW-Q100H, and TS5A3166QDCKRQ1 carry AEC-Q100 automotive qualification. NLAST4501DFT2G and ISL43L110IHZ-T do not list automotive qualification.

Q: What is the operating temperature range limitation for ISL43L110IHZ-T?

A: ISL43L110IHZ-T operates only to 85°C maximum, compared to 125°C for all other alternatives. Applications requiring operation above 85°C must use alternative parts.

Q: How do switching times compare across substitute options?

A: TS5A3166QDCKRQ1 offers the fastest Ton (7ns) and competitive Toff (11.5ns). NLAS4501DFT2 and NLAST4501DFT2G provide 9ns/10ns. 74AHC1G66GW-Q100H provides 11ns/11ns. 74HCT1G66GW-Q100H is slowest at 30ns/44ns. ISL43L110IHZ-T provides 15ns/10ns.

Q: Which part should be selected for new designs?

A: For new designs, select from active product alternatives: 74AHC1G66GW-Q100H, TS5A3166QDCKRQ1, or 74HCT1G66GW-Q100H. These parts offer long-term availability, current manufacturing support, and RoHS3 compliance. Selection depends on specific supply voltage range, switching speed, and automotive qualification requirements.

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