MAX4066ACSD Equivalent & Substitute Parts

Part Overview

The MAX4066ACSD is a 4-circuit SPST-NO (Single Pole Single Throw - Normally Open) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated. This component operates as a 1:1 multiplexer/demultiplexer with 45Ohm on-state resistance and is housed in a 14-SOIC surface mount package. The device is currently classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations. The MAX4066ACSD operates across a single supply voltage range of 2V to 16V with fast switching characteristics suitable for high-frequency signal routing applications.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Number of Circuits	4
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	45Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm
Supply Voltage Range (Single)	2V ~ 16V
Switch Time (Ton/Toff)	100ns / 75ns
-3dB Bandwidth	100MHz
Charge Injection	1pC
Channel Capacitance (CS(off)/CD(off))	9pF / 9pF
Leakage Current (IS(off)) Max	100pA
Crosstalk	-86dB @ 1MHz
Operating Temperature Range	0°C ~ 70°C
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX4066ACSD is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Switch circuit configuration: SPST - NO
Circuit count: 4 circuits
Multiplexer ratio: 1:1
Package type: 14-SOIC surface mount
On-state resistance compatibility: Maximum 45Ohm (or higher if application permits)
Supply voltage range: Minimum coverage of 2V ~ 16V (or subset thereof)
Channel-to-channel matching: 500mOhm or better

Secondary Compatibility Factors:

Switching speed (Ton/Toff): 100ns / 75ns or faster
Bandwidth: 100MHz or greater
Leakage current: 100pA or lower
Operating temperature range: Must encompass or exceed 0°C ~ 70°C

The MAX4066ACSD+ qualifies as a direct equivalent due to identical electrical specifications and package configuration. The CD74HC4066M qualifies as a functional substitute with noted parameter variations that must be evaluated for specific application requirements.

Parameter Comparison

Parameter	MAX4066ACSD (Main)	MAX4066ACSD+ (Direct Equivalent)	CD74HC4066M (Substitute)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Texas Instruments
Switch Circuit	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	4	4	4
Multiplexer Configuration	1:1	1:1	1:1
On-State Resistance (Max)	45Ohm	45Ohm	70Ohm
Channel-to-Channel Matching	500mOhm	500mOhm	500mOhm
Supply Voltage (Single)	2V ~ 16V	2V ~ 16V	2V ~ 10V
Switch Time (Ton/Toff)	100ns / 75ns	100ns / 75ns	Not specified
-3dB Bandwidth	100MHz	100MHz	200MHz
Charge Injection	1pC	1pC	Not specified
Channel Capacitance	9pF / 9pF	9pF / 9pF	5pF
Leakage Current (Max)	100pA	100pA	100nA
Crosstalk	-86dB @ 1MHz	-86dB @ 1MHz	-72dB @ 1MHz
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-55°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete	Active	Last Time Buy
RoHS Compliance	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAX4066ACSD+ (Direct Equivalent): The MAX4066ACSD+ is the primary recommended substitute for the obsolete MAX4066ACSD. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. The transition from the obsolete MAX4066ACSD to the MAX4066ACSD+ presents no electrical or mechanical compatibility concerns and is suitable for direct replacement in all applications.

CD74HC4066M (Functional Substitute): The CD74HC4066M from Texas Instruments qualifies as a functional substitute with the following considerations: on-state resistance is specified at 70Ohm (versus 45Ohm), supply voltage range is limited to 2V ~ 10V (versus 2V ~ 16V), leakage current is 100nA (versus 100pA), and crosstalk performance is -72dB @ 1MHz (versus -86dB @ 1MHz). The CD74HC4066M offers extended operating temperature range (-55°C ~ 125°C) and higher bandwidth (200MHz). This part is classified as Last Time Buy, indicating limited future availability. Selection of the CD74HC4066M requires verification that application requirements accommodate the higher on-state resistance and reduced supply voltage range.

Frequently Asked Questions (FAQ)

Q: Can the MAX4066ACSD+ be used as a direct replacement for the MAX4066ACSD?

A: Yes. The MAX4066ACSD+ is electrically and mechanically identical to the MAX4066ACSD. All electrical parameters, package dimensions, and pin configurations are equivalent. The primary difference is product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus Non-compliant).

Q: What are the key differences between the MAX4066ACSD and CD74HC4066M?

A: The CD74HC4066M differs in three primary specifications: on-state resistance (70Ohm versus 45Ohm), maximum supply voltage (10V versus 16V), and leakage current (100nA versus 100pA). The CD74HC4066M provides higher bandwidth (200MHz versus 100MHz) and extended temperature range (-55°C ~ 125°C versus 0°C ~ 70°C). Applications requiring the full 2V ~ 16V supply range or lower on-state resistance cannot use the CD74HC4066M without circuit redesign.

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

A: Yes. All three parts use the 14-SOIC surface mount package with identical dimensions (0.154" width, 3.90mm). No PCB layout modifications are required when substituting between these parts.

Q: What is the significance of the CD74HC4066M being classified as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has announced end-of-life for this product. Existing inventory may be available, but future procurement cannot be guaranteed. The CD74HC4066M should be considered a temporary solution only. The MAX4066ACSD+ is recommended for long-term design continuity.

Q: Are there RoHS compliance implications when substituting parts?

A: The MAX4066ACSD is RoHS non-compliant, while both the MAX4066ACSD+ and CD74HC4066M are ROHS3 compliant. If your application or supply chain requires RoHS compliance, the MAX4066ACSD+ or CD74HC4066M must be selected. The MAX4066ACSD cannot be used in RoHS-restricted environments.

Q: Which substitute part should be selected for new designs?

A: The MAX4066ACSD+ is the recommended choice for new designs. It provides identical electrical performance to the original MAX4066ACSD, active product status ensuring long-term availability, and ROHS3 compliance. The CD74HC4066M should only be considered if the application can accommodate its higher on-state resistance and reduced supply voltage range, and only as a temporary solution given its Last Time Buy status.

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