MAX333CAP Equivalent & Substitute Parts

Part Overview

The MAX333CAP is a 4-circuit SPDT (Single Pole Double Throw) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated. This component functions as a 2:1 multiplexer/demultiplexer with an on-state resistance of 250Ohm, designed for signal routing and switching applications in analog circuits. The device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SPDT (Single Pole Double Throw)
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	4
On-State Resistance (Max)	250Ohm
Voltage Supply - Single (V+)	10V ~ 30V
Voltage Supply - Dual (V±)	±5V ~ 18V
Switch Time (Ton, Toff) (Max)	1µs, 500ns
Channel Capacitance (CS(off), CD(off))	5pF
Current - Leakage (IS(off)) (Max)	5nA
Crosstalk	-78dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MAX333CAP is determined by strict equivalence in the following critical parameters:

Switch Circuit Type: SPDT configuration must be maintained
Circuit Count: 4 independent circuits required
Multiplexer Ratio: 2:1 switching architecture
Package Type: 20-SSOP surface mount package with identical physical dimensions (0.209", 5.30mm Width)
Supply Voltage Compatibility: Single supply (10V ~ 30V) and dual supply (±5V ~ 18V) ranges must be supported
Operating Temperature Range: 0°C ~ 70°C minimum requirement

The MAX333ACAP+ qualifies as a direct substitute based on identical circuit topology, package form factor, and supply voltage specifications. Differences in on-state resistance, switching speed, and leakage current represent performance improvements rather than compatibility barriers, as the substitute maintains backward compatibility with the original design envelope.

Parameter Comparison

Parameter	MAX333CAP	MAX333ACAP+
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Switch Circuit	SPDT	SPDT
Multiplexer/Demultiplexer Circuit	2:1	2:1
Number of Circuits	4	4
On-State Resistance (Max)	250Ohm	45Ohm
Voltage - Supply, Single (V+)	10V ~ 30V	10V ~ 30V
Voltage - Supply, Dual (V±)	±5V ~ 18V	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	1µs, 500ns	175ns, 145ns
Channel Capacitance (CS(off), CD(off))	5pF	5pF
Current - Leakage (IS(off)) (Max)	5nA	250pA
Crosstalk	-78dB @ 1MHz	-78dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The MAX333ACAP+ is the qualified substitute for the obsolete MAX333CAP. Selection is based on the following engineering criteria:

Product Status: The MAX333CAP is classified as obsolete, creating supply chain risk. The MAX333ACAP+ maintains active product status with confirmed inventory availability (1932 Pcs New Original In Stock), ensuring long-term procurement viability.

Regulatory Compliance: The MAX333ACAP+ is ROHS3 compliant, whereas the MAX333CAP is RoHS non-compliant. This compliance difference is significant for applications subject to RoHS directives and environmental regulations.

Functional Compatibility: Both devices share identical circuit topology (4-circuit SPDT 2:1 multiplexer), supply voltage ranges, and package specifications. The MAX333ACAP+ provides superior electrical performance with reduced on-state resistance (45Ohm vs. 250Ohm), faster switching times (175ns/145ns vs. 1µs/500ns), and lower leakage current (250pA vs. 5nA). These improvements are backward compatible with existing designs.

Package Compatibility: Both parts use the 20-SSOP surface mount package with identical physical dimensions, enabling direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can the MAX333ACAP+ directly replace the MAX333CAP in existing designs?

A: Yes. The MAX333ACAP+ is a direct substitute with identical circuit topology, supply voltage specifications, and 20-SSOP package form factor. No PCB redesign is required. The improved electrical performance of the MAX333ACAP+ (lower resistance, faster switching, reduced leakage) is backward compatible with designs specified for the MAX333CAP.

Q: What are the key differences between these two parts?

A: The primary differences are on-state resistance (250Ohm vs. 45Ohm), switching speed (1µs/500ns vs. 175ns/145ns), leakage current (5nA vs. 250pA), and product status (obsolete vs. active). The MAX333ACAP+ also offers ROHS3 compliance. These represent performance enhancements rather than functional incompatibilities.

Q: Are there supply voltage compatibility concerns?

A: Both parts support single supply operation (10V ~ 30V) and dual supply operation. The MAX333ACAP+ extends the dual supply range to ±4.5V ~ 20V compared to the MAX333CAP's ±5V ~ 18V. This represents an expanded operating envelope with no compatibility restrictions.

Q: Does the package change affect PCB assembly?

A: No. Both parts use the identical 20-SSOP surface mount package with 0.209" (5.30mm) width. PCB footprints, solder reflow profiles, and assembly processes remain unchanged.

Q: Why is the MAX333CAP classified as obsolete?

A: The MAX333CAP has been superseded by the MAX333ACAP+, which offers superior electrical performance and regulatory compliance. Analog Devices Inc./Maxim Integrated has transitioned production to the newer variant.

Q: What is the impact of RoHS compliance differences?

A: The MAX333ACAP+ is ROHS3 compliant, while the MAX333CAP is RoHS non-compliant. For applications subject to RoHS directives (EU and equivalent regulations), the MAX333ACAP+ is the required choice. For legacy systems without RoHS requirements, both parts are functionally equivalent.

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