MAX333ACUP Equivalent & Substitute Parts

Part Overview

The MAX333ACUP is a 4-circuit SPDT (Single Pole Double Throw) analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-TSSOP surface mount package with 45Ohm on-state resistance. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production requirements. The part operates across supply voltage ranges of 10V to 30V (single supply) or ±4.5V to ±20V (dual supply), making it suitable for signal routing and multiplexing applications in industrial and consumer electronics.

Key Parameters

Parameter	MAX333ACUP
Switch Circuit Type	SPDT
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	4
On-State Resistance (Max)	45Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm (Max)
Voltage - Supply, Single (V+)	10V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	175ns, 145ns
Charge Injection	2pC
Channel Capacitance (CS(off), CD(off))	5pF
Current - Leakage (IS(off)) (Max)	250pA
Crosstalk	-78dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	20-TSSOP (0.173", 4.40mm Width)
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MAX333ACUP is determined by the following critical parameters:

Primary Substitution Criteria:

Switch circuit topology (SPDT vs. SPST)
Multiplexer configuration (2:1 vs. 1:1)
Number of circuits (4 circuits required)
On-state resistance compatibility
Supply voltage range compatibility
Package type (20-TSSOP preferred for pin-compatible replacement)
Product status (Active preferred over Obsolete)
RoHS compliance status

Direct Equivalent (Packaging Variant): MAX333ACUP+ is an active variant of the same base product (MAX333) with identical electrical specifications but improved RoHS3 compliance and Tube packaging.

Functional Equivalents (SPDT 2:1 Configuration): ADG1634BRUZ, ADG1634BRUZ-REEL7, ADG5434BRUZ, and ADG5434BRUZ-REEL7 maintain the SPDT 2:1 topology with 4 circuits in 20-TSSOP packaging. These parts differ in on-state resistance, operating temperature range, and supply voltage specifications.

ADG333ABRSZ and ADG333ABRSZ-REEL maintain SPDT 2:1 topology with 4 circuits but use 20-SSOP packaging instead of 20-TSSOP, requiring PCB layout modification.

Functional Alternative (Different Topology): ADG1334BRSZ and ADG1334BRSZ-REEL employ SPST (Single Pole Single Throw) NO/NC topology with 1:1 multiplexer configuration, suitable only for applications not requiring SPDT switching capability.

Parameter Comparison

Part Number	Manufacturer	Product Status	Switch Circuit	Multiplexer Config	Number of Circuits	On-State Resistance (Max)	Supply Single (V+)	Supply Dual (V±)	Operating Temp	Package	RoHS Status
MAX333ACUP	Analog Devices Inc./Maxim Integrated	Obsolete	SPDT	2:1	4	45Ohm	10V ~ 30V	±4.5V ~ 20V	0°C ~ 70°C	20-TSSOP	RoHS non-compliant
MAX333ACUP+	Analog Devices Inc./Maxim Integrated	Active	SPDT	2:1	4	45Ohm	10V ~ 30V	±4.5V ~ 20V	0°C ~ 70°C	20-TSSOP	ROHS3 Compliant
ADG1634BRUZ	Analog Devices Inc.	Active	SPDT	2:1	4	4.5Ohm	3.3V ~ 16V	±3.3V ~ 8V	-40°C ~ 125°C	20-TSSOP	ROHS3 Compliant
ADG1634BRUZ-REEL7	Analog Devices Inc.	Active	SPDT	2:1	4	4.5Ohm	3.3V ~ 16V	±3.3V ~ 8V	-40°C ~ 125°C	20-TSSOP	ROHS3 Compliant
ADG5434BRUZ	Analog Devices Inc.	Active	SPDT	2:1	4	14Ohm	9V ~ 40V	±9V ~ 22V	-40°C ~ 125°C	20-TSSOP	ROHS3 Compliant
ADG5434BRUZ-REEL7	Analog Devices Inc.	Active	SPDT	2:1	4	14Ohm	9V ~ 40V	±9V ~ 22V	-40°C ~ 125°C	20-TSSOP	ROHS3 Compliant
ADG333ABRSZ	Analog Devices Inc.	Active	SPDT	2:1	4	45Ohm	3V ~ 30V	±3V ~ 20V	-40°C ~ 85°C	20-SSOP	ROHS3 Compliant
ADG333ABRSZ-REEL	Analog Devices Inc.	Active	SPDT	2:1	4	45Ohm	3V ~ 30V	±3V ~ 20V	-40°C ~ 85°C	20-SSOP	ROHS3 Compliant
ADG1334BRSZ	Analog Devices Inc.	Active	SPST - NO/NC	1:1	4	200Ohm	12V	±15V	-40°C ~ 105°C	20-SSOP	ROHS3 Compliant
ADG1334BRSZ-REEL	Analog Devices Inc.	Active	SPST - NO/NC	1:1	4	200Ohm	12V	±15V	-40°C ~ 105°C	20-SSOP	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended): MAX333ACUP+ is the primary recommendation for direct substitution. It maintains identical electrical specifications and 20-TSSOP pin compatibility while offering Active product status and ROHS3 compliance, eliminating the need for design modification or qualification testing.

Tier 2 - Pin-Compatible Functional Equivalents (20-TSSOP Package): ADG1634BRUZ and ADG1634BRUZ-REEL7 provide SPDT 2:1 topology with superior on-state resistance (4.5Ohm vs. 45Ohm), extended operating temperature range (-40°C to 125°C), and ROHS3 compliance. These parts are suitable for applications where lower on-state resistance improves signal integrity. Supply voltage range is narrower (3.3V to 16V single, ±3.3V to ±8V dual), requiring verification against system requirements.

ADG5434BRUZ and ADG5434BRUZ-REEL7 maintain SPDT 2:1 topology with intermediate on-state resistance (14Ohm) and broader supply voltage range (9V to 40V single, ±9V to ±22V dual), accommodating higher-voltage applications. Extended operating temperature range (-40°C to 125°C) and ROHS3 compliance are provided.

Tier 3 - Package-Modified Equivalents (20-SSOP Package): ADG333ABRSZ and ADG333ABRSZ-REEL maintain identical 45Ohm on-state resistance and SPDT 2:1 topology but require PCB layout modification due to 20-SSOP packaging (0.209" width vs. 0.173" for TSSOP). These parts offer broader supply voltage range (3V to 30V single, ±3V to ±20V dual) and ROHS3 compliance.

Tier 4 - Functional Alternative (Different Topology): ADG1334BRSZ and ADG1334BRSZ-REEL employ SPST NO/NC topology unsuitable for applications requiring SPDT switching. These parts are applicable only to designs where single-pole switching meets functional requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX333ACUP be directly replaced with MAX333ACUP+ without design changes? A: Yes. MAX333ACUP+ is a direct pin-compatible equivalent with identical electrical specifications. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No PCB or firmware modifications are required.

Q: What is the key difference between ADG1634BRUZ and ADG5434BRUZ? A: Both maintain SPDT 2:1 topology with 4 circuits in 20-TSSOP packaging. ADG1634BRUZ offers lower on-state resistance (4.5Ohm) with narrower supply voltage range (3.3V to 16V single). ADG5434BRUZ provides higher on-state resistance (14Ohm) with broader supply voltage range (9V to 40V single), suitable for higher-voltage systems.

Q: Why do ADG333ABRSZ parts use 20-SSOP packaging instead of 20-TSSOP? A: ADG333ABRSZ is a different product line variant. While maintaining identical on-state resistance (45Ohm) and SPDT 2:1 topology, the 20-SSOP package (0.209" width) differs from the original 20-TSSOP (0.173" width), requiring PCB footprint redesign and re-qualification.

Q: Can ADG1334BRSZ replace MAX333ACUP in existing designs? A: No. ADG1334BRSZ employs SPST NO/NC topology (1:1 multiplexer) instead of SPDT (2:1 multiplexer). This fundamental circuit difference makes it unsuitable for applications requiring SPDT switching functionality. Use only if design requirements permit single-pole operation.

Q: What supply voltage range should I verify when selecting a substitute? A: Verify both single-supply (V+) and dual-supply (V±) ranges against your system design. MAX333ACUP operates at 10V to 30V (single) or ±4.5V to ±20V (dual). ADG1634BRUZ operates at narrower ranges (3.3V to 16V single, ±3.3V to ±8V dual), while ADG5434BRUZ supports broader ranges (9V to 40V single, ±9V to ±22V dual).

Q: Are all substitute parts RoHS3 compliant? A: All substitute parts listed are ROHS3 compliant. The original MAX333ACUP is RoHS non-compliant. MAX333ACUP+ provides the same electrical performance with ROHS3 compliance for new designs subject to RoHS regulations.

Q: What is the significance of packaging variants (Tube vs. Cut Tape & Digi-Reel)? A: Tube and Cut Tape & Digi-Reel packaging are supply format variants of identical electrical parts. Selection depends on procurement and assembly requirements. Tube packaging suits lower-volume applications, while Cut Tape & Digi-Reel accommodates automated pick-and-place assembly at higher volumes.

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