MAX4501EXK-T Equivalent & Substitute Parts

Part Overview

The MAX4501EXK-T is a single-circuit SPST (Single Pole Single Throw) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated. This component operates as a normally-open switch with 250Ohm on-state resistance and is housed in a 5-TSSOP (SC-70-5) surface mount package. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain functional compatibility across switch circuit topology, package form factor, and electrical operating parameters.

Key Parameters

Parameter	MAX4501EXK-T
Switch Circuit Type	SPST - NO (Single Pole Single Throw - Normally Open)
Multiplexer/Demultiplexer Circuit	1:1
Number of Circuits	1
On-State Resistance (Max)	250Ohm
Supply Voltage Range (Single)	2V ~ 12V
Switch Time - Ton/Toff (Max)	75ns / 50ns
Charge Injection	1pC
Channel Capacitance (CS(off) / CD(off))	3pF / 3pF
Leakage Current (IS(off)) Max	1nA
Operating Temperature Range	-40°C ~ 85°C
Package / Case	5-TSSOP, SC-70-5, SOT-353
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX4501EXK-T is determined by strict adherence to the following parameters:

Critical Matching Parameters:

Switch circuit topology: SPST - NO (1:1 multiplexer configuration)
Package form factor: 5-TSSOP / SC-70-5 / SOT-353 surface mount
Number of circuits: 1
Supply voltage compatibility: Minimum 2V operation required
On-state resistance: Maximum 250Ohm (lower values acceptable for reduced signal loss)
Operating temperature range: Minimum -40°C ~ 85°C coverage

Acceptable Variation Parameters:

Switch time (Ton/Toff): Faster switching acceptable
Leakage current: Lower values acceptable
Charge injection: Lower values acceptable
Channel capacitance: Lower values acceptable

Substitute parts must satisfy all critical matching parameters. Variations in acceptable parameters do not disqualify a substitute if the critical parameters align.

Parameter Comparison

Parameter	MAX4501EXK-T	MAX4501EXK+T	74HC1G66GW-Q100H	ISL43L110IHZ-T
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Nexperia USA Inc.	Renesas Electronics Corporation
Switch Circuit	SPST - NO	SPST - NO	SPST - NO	SPST - NO
Multiplexer Configuration	1:1	1:1	1:1	1:1
Number of Circuits	1	1	1	1
On-State Resistance (Max)	250Ohm	250Ohm	80Ohm	220mOhm (Typ)
Supply Voltage Range	2V ~ 12V	2V ~ 12V	2V ~ 10V	1.1V ~ 4.5V
Switch Time - Ton/Toff (Max)	75ns / 50ns	75ns / 50ns	20ns / 20ns	15ns / 10ns
Charge Injection	1pC	1pC	Not specified	89pC
Channel Capacitance (CS(off) / CD(off))	3pF / 3pF	3pF / 3pF	Not specified	68pF
Leakage Current (IS(off)) Max	1nA	1nA	1µA	30nA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°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
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAX4501EXK+T (Parametric Equivalent)

This part is the direct parametric equivalent to the MAX4501EXK-T, manufactured by the same supplier (Analog Devices Inc./Maxim Integrated). It maintains identical electrical specifications including 250Ohm on-state resistance, 2V ~ 12V supply range, and 75ns/50ns switch timing. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. standard). This substitute is suitable for applications requiring exact electrical performance matching. RoHS3 compliance provides regulatory advantage over the original obsolete part.

74HC1G66GW-Q100H (Performance-Enhanced Substitute)

This Nexperia part satisfies all critical matching parameters with improved electrical performance. On-state resistance is reduced to 80Ohm (68% lower than original), and switch times are significantly faster (20ns vs. 75ns/50ns). Supply voltage range is 2V ~ 10V, which covers the primary operating window of the original part. Operating temperature extends to 125°C. This substitute is suitable for applications where lower on-state resistance and faster switching provide system benefits. AEC-Q100 automotive qualification and RoHS3 compliance are provided. Note: Supply voltage maximum is 10V versus 12V on the original part.

ISL43L110IHZ-T (Low-Voltage Optimized Substitute)

This Renesas part satisfies critical matching parameters with ultra-low on-state resistance (220mOhm typical). Supply voltage range is 1.1V ~ 4.5V, which is narrower than the original part and does not support the full 12V upper limit. Switch times are faster (15ns/10ns). Leakage current is higher (30nA vs. 1nA) and charge injection is significantly higher (89pC vs. 1pC). This substitute is suitable only for applications operating within the 1.1V ~ 4.5V range where ultra-low on-state resistance is required. RoHS3 compliance is provided.

Frequently Asked Questions (FAQ)

Q: Can MAX4501EXK+T be used as a direct replacement for MAX4501EXK-T?

A: Yes. MAX4501EXK+T is a parametric equivalent with identical electrical specifications. The primary differences are product status (Active vs. Obsolete) and packaging format (Tape & Reel). Both parts maintain 250Ohm on-state resistance, 2V ~ 12V supply range, and identical switch timing. RoHS3 compliance of the +T variant provides regulatory advantage.

Q: What are the key differences between 74HC1G66GW-Q100H and the original MAX4501EXK-T?

A: The 74HC1G66GW-Q100H offers lower on-state resistance (80Ohm vs. 250Ohm) and faster switching (20ns vs. 75ns/50ns). Supply voltage range is 2V ~ 10V, which covers standard operating conditions but does not extend to the original 12V maximum. Operating temperature range extends to 125°C. All parts share identical package form factor and SPST-NO topology.

Q: Is ISL43L110IHZ-T suitable for all applications using MAX4501EXK-T?

A: No. ISL43L110IHZ-T has a narrower supply voltage range (1.1V ~ 4.5V) and does not support operation above 4.5V. This part is suitable only for applications operating within this voltage window. Higher leakage current (30nA) and charge injection (89pC) may affect signal integrity in sensitive analog applications compared to the original part.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts are available in 5-TSSOP / SC-70-5 / SOT-353 surface mount packages, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: What compliance certifications apply to substitute parts?

A: MAX4501EXK+T, 74HC1G66GW-Q100H, and ISL43L110IHZ-T are all RoHS3 compliant. The 74HC1G66GW-Q100H carries AEC-Q100 automotive qualification. All parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: Which substitute is recommended for new designs?

A: Selection depends on application requirements. For exact electrical performance matching, use MAX4501EXK+T. For improved performance with lower on-state resistance and faster switching within 2V ~ 10V range, use 74HC1G66GW-Q100H. For low-voltage applications (1.1V ~ 4.5V) requiring ultra-low on-state resistance, use ISL43L110IHZ-T.

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