MAX321CUA Equivalent & Substitute Parts

Part Overview

The MAX321CUA is a 2-circuit IC switch with SPST-NC (Single Pole Single Throw - Normally Closed) configuration, rated at 35Ohm on-state resistance in an 8-uMAX/uSOP package. This component is classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. The part operates with dual supply voltage (±2.7V ~ 8V) and features low charge injection (2pC) and minimal crosstalk (-85dB @ 1MHz), making it suitable for precision analog switching applications.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NC
Number of Circuits	2
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	35Ohm
Channel-to-Channel Matching (ΔRon)	300mOhm
Voltage - Supply, Dual (V±)	±2.7V ~ 8V
Switch Time (Ton, Toff) (Max)	150ns, 100ns
Charge Injection	2pC
Channel Capacitance (CS(off), CD(off))	9pF, 9pF
Current - Leakage (IS(off)) (Max)	100pA
Crosstalk	-85dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the MAX321CUA is determined by strict equivalence across the following critical parameters:

Switch circuit topology (SPST - NC configuration)
Number of circuits (2 circuits)
Multiplexer/demultiplexer ratio (1:1)
On-state resistance specification (35Ohm maximum)
Channel-to-channel matching tolerance (300mOhm)
Dual supply voltage range (±2.7V ~ 8V)
Switch timing characteristics (Ton ≤ 150ns, Toff ≤ 100ns)
Charge injection performance (2pC)
Channel capacitance values (9pF, 9pF)
Leakage current specification (100pA maximum)
Crosstalk performance (-85dB @ 1MHz)
Operating temperature range (0°C ~ 70°C)
Physical package form factor (8-TSSOP, 8-MSOP, 0.118" width, 3.00mm)
Surface mount mounting type

Only parts meeting all these criteria are considered direct substitutes.

Parameter Comparison

Parameter	MAX321CUA (Main Part)	MAX321CUA+ (Substitute)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Switch Circuit	SPST - NC	SPST - NC
Number of Circuits	2	2
Multiplexer/Demultiplexer Circuit	1:1	1:1
On-State Resistance (Max)	35Ohm	35Ohm
Channel-to-Channel Matching (ΔRon)	300mOhm	300mOhm
Voltage - Supply, Dual (V±)	±2.7V ~ 8V	±2.7V ~ 8V
Switch Time (Ton, Toff) (Max)	150ns, 100ns	150ns, 100ns
Charge Injection	2pC	2pC
Channel Capacitance (CS(off), CD(off))	9pF, 9pF	9pF, 9pF
Current - Leakage (IS(off)) (Max)	100pA	100pA
Crosstalk	-85dB @ 1MHz	-85dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging Type	Not specified	Tube

Engineering Selection Recommendations

The MAX321CUA+ is a direct functional equivalent to the MAX321CUA with identical electrical and mechanical specifications across all critical parameters. The primary distinction is product status: the MAX321CUA is obsolete while the MAX321CUA+ is active production.

The MAX321CUA+ offers additional compliance advantages. It meets ROHS3 requirements, whereas the original MAX321CUA is RoHS non-compliant. Both parts maintain REACH Unaffected status and EAR99 export classification.

For new designs or production continuity, the MAX321CUA+ is the appropriate selection due to its active status and enhanced regulatory compliance. Both parts are supplied by Analog Devices Inc./Maxim Integrated and share identical electrical performance characteristics, ensuring functional interchangeability in applications requiring 2-circuit SPST-NC switching with 35Ohm on-state resistance and dual supply operation.

Frequently Asked Questions (FAQ)

Q: Can MAX321CUA+ replace MAX321CUA in existing designs?

A: Yes. The MAX321CUA+ is electrically and mechanically identical to the MAX321CUA across all specified parameters. Both parts feature identical switch circuit topology, on-state resistance, supply voltage range, timing characteristics, and package form factor. Substitution is direct.

Q: Why is the MAX321CUA listed as obsolete?

A: The MAX321CUA has reached end-of-life status. The MAX321CUA+ provides continued availability with identical performance specifications and active production support from Analog Devices Inc./Maxim Integrated.

Q: What is the difference between MAX321CUA and MAX321CUA+ packaging?

A: The MAX321CUA packaging type is not specified in available documentation. The MAX321CUA+ is supplied in Tube packaging. Both parts use the same 8-TSSOP, 8-MSOP physical form factor (0.118" width, 3.00mm).

Q: Are there RoHS compliance differences between these parts?

A: Yes. The MAX321CUA is RoHS non-compliant. The MAX321CUA+ is ROHS3 compliant. For applications requiring RoHS compliance, the MAX321CUA+ is the required selection.

Q: Do both parts operate with the same supply voltage range?

A: Yes. Both MAX321CUA and MAX321CUA+ operate with dual supply voltage of ±2.7V ~ 8V. No supply voltage adjustments are required when substituting between these parts.

Q: What is the on-state resistance specification for these parts?

A: Both parts specify a maximum on-state resistance of 35Ohm with channel-to-channel matching of 300mOhm. This specification is identical across both part numbers.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message