MAX333C/D Equivalent & Substitute Parts Reference

Part Overview

The MAX333C/D is a 4-circuit SPDT IC switch with 2:1 multiplexer/demultiplexer functionality, manufactured by Analog Devices Inc./Maxim Integrated. This die-format component operates across single supply (10V to 30V) and dual supply (±5V to ±18V) configurations with a maximum on-state resistance of 175Ohm and switching times of 1µs (Ton) and 500ns (Toff).

The MAX333C/D is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for applications utilizing this interface switching architecture.

Key Parameters

Parameter	Value
Switch Circuit Type	SPDT
Multiplexer/Demultiplexer Configuration	2:1
Number of Circuits	4
On-State Resistance (Max)	175Ohm
Voltage Supply - Single (V+)	10V ~ 30V
Voltage Supply - Dual (V±)	±5V ~ ±18V
Switch Time Ton (Max)	1µs
Switch Time Toff (Max)	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 Type	Die
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX333C/D is determined by strict equivalence across the following critical parameters:

Functional Architecture Requirements:

Switch circuit type: SPDT (Single Pole Double Throw)
Multiplexer/demultiplexer configuration: 2:1
Number of circuits: 4

Electrical Performance Requirements:

Voltage supply ranges: Single supply 10V ~ 30V and dual supply ±5V ~ ±18V
Switch timing: Ton ≤ 1µs, Toff ≤ 500ns
Channel capacitance: 5pF
Leakage current: IS(off) ≤ 5nA
Crosstalk: -78dB @ 1MHz
Operating temperature: 0°C ~ 70°C

Mechanical and Packaging Considerations:

Mounting type: Surface Mount
Base product number: MAX333 series

Substitute parts must maintain all specified electrical parameters and support the same functional configuration. On-state resistance values may vary within acceptable design margins provided all other parameters remain equivalent or superior.

Parameter Comparison

Parameter	MAX333C/D (Main Part)	MAX333CWP+ (Substitute)	Compatibility
Switch Circuit	SPDT	SPDT	Equivalent
Multiplexer/Demultiplexer Circuit	2:1	2:1	Equivalent
Number of Circuits	4	4	Equivalent
On-State Resistance (Max)	175Ohm	250Ohm	Substitute higher
Voltage - Supply, Single (V+)	10V ~ 30V	10V ~ 30V	Equivalent
Voltage - Supply, Dual (V±)	±5V ~ ±18V	±5V ~ ±18V	Equivalent
Switch Time Ton (Max)	1µs	1µs	Equivalent
Switch Time Toff (Max)	500ns	500ns	Equivalent
Channel Capacitance	5pF	5pF	Equivalent
Current - Leakage IS(off) (Max)	5nA	5nA	Equivalent
Crosstalk	-78dB @ 1MHz	-78dB @ 1MHz	Equivalent
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	Die	20-SOIC (0.295", 7.50mm Width)	Different form factor
Product Status	Obsolete	Active	Substitute is active
RoHS Status	Not specified	ROHS3 Compliant	Substitute compliant
Moisture Sensitivity Level	Not specified	MSL 1 (Unlimited)	Substitute specified

Engineering Selection Recommendations

MAX333CWP+ as Primary Substitute:

The MAX333CWP+ is the manufacturer-recommended substitute for the obsolete MAX333C/D. This part maintains functional equivalence across all critical switching parameters: SPDT configuration, 2:1 multiplexer/demultiplexer architecture, 4-circuit count, and identical supply voltage ranges (10V ~ 30V single, ±5V ~ ±18V dual).

Electrical performance is preserved: switching times (1µs Ton, 500ns Toff), channel capacitance (5pF), leakage current (5nA), and crosstalk performance (-78dB @ 1MHz) remain unchanged. Operating temperature range (0°C ~ 70°C) is identical.

Key Differences:

The MAX333CWP+ is packaged in 20-SOIC form factor rather than die format. On-state resistance is specified at 250Ohm maximum, compared to 175Ohm for the MAX333C/D. This represents a 43% increase in on-state resistance.

Compliance Status:

The MAX333CWP+ carries active product status with ROHS3 compliance certification and MSL 1 (Unlimited) moisture sensitivity rating. These certifications support modern manufacturing and supply chain requirements.

Design Consideration:

The increased on-state resistance of the MAX333CWP+ (250Ohm vs. 175Ohm) must be evaluated within the context of the application circuit. Applications with low-impedance signal paths or high-frequency switching may require verification that the higher resistance does not degrade signal integrity or introduce unacceptable insertion loss.

Frequently Asked Questions (FAQ)

Q: Can the MAX333CWP+ directly replace the MAX333C/D in all applications?

A: The MAX333CWP+ maintains functional equivalence in switching architecture, supply voltage ranges, and switching timing. However, the package format differs (20-SOIC vs. Die), and on-state resistance is higher (250Ohm vs. 175Ohm). Circuit board layout and signal path impedance must be re-evaluated for the new package form factor. Applications sensitive to on-state resistance should verify that 250Ohm is acceptable for the intended signal levels and frequencies.

Q: What is the significance of the package change from Die to 20-SOIC?

A: The die format of the MAX333C/D is a bare semiconductor die requiring hybrid integration or direct die attachment to a substrate. The 20-SOIC package of the MAX333CWP+ is a standard surface-mount integrated circuit package with leads, suitable for conventional PCB assembly. This change simplifies procurement, handling, and assembly but requires PCB redesign to accommodate the different footprint and pinout.

Q: Are there electrical performance differences between these parts?

A: All critical switching parameters are identical: SPDT configuration, 2:1 multiplexing, 4-circuit count, supply voltage ranges, switching times, channel capacitance, leakage current, and crosstalk performance. The on-state resistance specification differs: MAX333C/D is 175Ohm maximum, while MAX333CWP+ is 250Ohm maximum. This difference must be evaluated based on application requirements for signal attenuation and power dissipation.

Q: Why is the MAX333C/D classified as obsolete?

A: The MAX333C/D is an obsolete product, indicating it is no longer manufactured or supported by Analog Devices Inc./Maxim Integrated. The MAX333CWP+ is the active product replacement, ensuring continued availability and support for the MAX333 switching architecture.

Q: What compliance certifications apply to the MAX333CWP+?

A: The MAX333CWP+ is ROHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity rating. These certifications indicate compliance with current environmental and reliability standards for electronic components.

Q: Are there other substitute options for the MAX333C/D?

A: Based on the provided data, the MAX333CWP+ is the manufacturer-recommended substitute. Evaluation of alternative substitutes would require additional technical specifications and compatibility analysis beyond the scope of this reference.

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