MAX4611CSD Equivalent & Substitute Parts

Part Overview

The MAX4611CSD is a 4-circuit IC switch with SPST-NC (Single Pole Single Throw - Normally Closed) configuration, manufactured by Analog Devices Inc./Maxim Integrated. This component operates as a 1:1 multiplexer/demultiplexer with 100Ohm on-state resistance and is housed in a 14-SOIC surface mount package. The MAX4611CSD is currently classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NC
Number of Circuits	4
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	100Ohm
Channel-to-Channel Matching (ΔRon)	1Ohm
Voltage - Supply, Single (V+)	2V ~ 12V
Switch Time (Ton, Toff) (Max)	65ns, 28ns
-3dB Bandwidth	300MHz
Charge Injection	1pC
Channel Capacitance (CS(off), CD(off))	16pF, 16pF
Current - Leakage (IS(off)) (Max)	100pA
Crosstalk	-80dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX4611CSD is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Switch circuit topology (SPST-NC vs. SPST-NO)
Number of circuits (4 circuits required)
Multiplexer/demultiplexer configuration (1:1)
On-state resistance compatibility
Supply voltage range (2V ~ 12V minimum)
Package type (14-SOIC surface mount)
Operating temperature range

Substitution Categories:

Parametric Equivalent: MAX4611CSD+ maintains identical electrical specifications and switch circuit topology (SPST-NC) with the same 100Ohm on-state resistance, 1Ohm channel matching, and 300MHz bandwidth. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. non-compliant). Packaging differs only in delivery format (Tube vs. standard).

Functional Substitute: MC74HC4066ADG and MC74HC4066ADR2G are SPST-NO (Normally Open) configuration switches manufactured by onsemi. These parts operate with identical supply voltage range (2V ~ 12V), same 14-SOIC package, and equivalent crosstalk performance (-80dB @ 1MHz). However, they feature 70Ohm on-state resistance (vs. 100Ohm), 15Ohm channel matching (vs. 1Ohm), and 160MHz bandwidth (vs. 300MHz). The switch circuit topology differs (NO vs. NC), requiring circuit-level evaluation for compatibility.

Parameter Comparison

Parameter	MAX4611CSD	MAX4611CSD+	MC74HC4066ADG	MC74HC4066ADR2G
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	onsemi	onsemi
Switch Circuit	SPST - NC	SPST - NC	SPST - NO	SPST - NO
Number of Circuits	4	4	4	4
Multiplexer Configuration	1:1	1:1	1:1	1:1
On-State Resistance (Max)	100Ohm	100Ohm	70Ohm	70Ohm
Channel-to-Channel Matching (ΔRon)	1Ohm	1Ohm	15Ohm	15Ohm
Voltage - Supply, Single (V+)	2V ~ 12V	2V ~ 12V	2V ~ 12V	2V ~ 12V
-3dB Bandwidth	300MHz	300MHz	160MHz	160MHz
Crosstalk	-80dB @ 1MHz	-80dB @ 1MHz	-80dB @ 1MHz	-80dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Standard	Tube	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

MAX4611CSD+ is the recommended direct replacement for MAX4611CSD. This part maintains all electrical specifications including SPST-NC topology, 100Ohm on-state resistance, 1Ohm channel matching, and 300MHz bandwidth. The part is currently in Active product status with ROHS3 compliance, addressing the obsolescence and regulatory compliance limitations of the original MAX4611CSD. Packaging is available in Tube format with 1118 units in stock.

For Functional Substitution (Circuit-Level Evaluation Required):

MC74HC4066ADG and MC74HC4066ADR2G are functional alternatives when circuit topology permits SPST-NO (Normally Open) operation. These onsemi parts provide extended operating temperature range (-55°C ~ 125°C vs. 0°C ~ 70°C), ROHS3 compliance, and higher inventory availability (2373 and 25290 units respectively). The trade-offs include reduced on-state resistance (70Ohm vs. 100Ohm), increased channel matching variation (15Ohm vs. 1Ohm), and lower bandwidth (160MHz vs. 300MHz). These parts are suitable for applications where the lower on-state resistance and extended temperature range provide system benefits and where the switch circuit topology change does not compromise circuit function.

Frequently Asked Questions (FAQ)

Q: Can MAX4611CSD+ be used as a direct replacement for MAX4611CSD?

A: Yes. MAX4611CSD+ is a parametric equivalent with identical electrical specifications, switch circuit topology (SPST-NC), and package type (14-SOIC). The part is currently in Active status with ROHS3 compliance, making it suitable for direct substitution in existing designs and new implementations.

Q: What is the primary difference between MAX4611CSD and MC74HC4066ADG?

A: The primary differences are switch circuit topology (SPST-NC vs. SPST-NO), on-state resistance (100Ohm vs. 70Ohm), channel matching (1Ohm vs. 15Ohm), and bandwidth (300MHz vs. 160MHz). MC74HC4066ADG is a functional alternative only when the circuit design permits Normally Open switch operation. The onsemi part provides extended operating temperature range (-55°C ~ 125°C).

Q: Are MC74HC4066ADR2G and MC74HC4066ADG electrically identical?

A: MC74HC4066ADR2G and MC74HC4066ADG are electrically identical. The difference is packaging format: MC74HC4066ADR2G is supplied in Tape & Reel (TR) format with significantly higher inventory (25290 units), while MC74HC4066ADG is supplied in Tube format (2373 units).

Q: What does SPST-NC and SPST-NO mean in the context of these switches?

A: SPST-NC (Single Pole Single Throw - Normally Closed) means the switch contact is closed in the default state and opens when activated. SPST-NO (Single Pole Single Throw - Normally Open) means the switch contact is open in the default state and closes when activated. Circuit design determines which topology is required.

Q: Is the 14-SOIC package identical across all listed parts?

A: Yes. All parts use the 14-SOIC surface mount package with 0.154" (3.90mm) width. PCB footprint and land pattern compatibility is maintained across MAX4611CSD, MAX4611CSD+, MC74HC4066ADG, and MC74HC4066ADR2G.

Q: Why is MAX4611CSD classified as obsolete?

A: MAX4611CSD is listed as obsolete by the manufacturer. MAX4611CSD+ is the active replacement part with identical specifications and improved RoHS compliance status.

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