MAX323CSA Equivalent & Substitute Parts

Part Overview

The MAX323CSA is a 2-circuit SPST-NO analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface mount package. This component functions as a single-pole single-throw normally-open switch with 60Ohm on-state resistance, designed for signal routing and multiplexing applications in the 2.7V to 16V supply range.

The MAX323CSA is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance or redesign initiatives.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO (Single-Pole Single-Throw Normally-Open)
Number of Circuits	2
Multiplexer/Demultiplexer Configuration	1:1
On-State Resistance (Max)	60Ohm
Channel-to-Channel Matching (ΔRon)	800mOhm
Supply Voltage Range (Single)	2.7V ~ 16V
Switch Time (Ton/Toff Max)	150ns / 100ns
Charge Injection	1pC
Channel Capacitance (CS(off) / CD(off))	9pF / 9pF
Leakage Current (IS(off) Max)	100pA
Crosstalk	-85dB @ 1MHz
Operating Temperature Range	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAX323CSA is determined by strict equivalence across the following critical parameters:

Switch circuit topology: SPST - NO configuration
Circuit count: 2 circuits minimum
Multiplexer ratio: 1:1
On-state resistance: 60Ohm maximum
Channel-to-channel matching: 800mOhm maximum
Supply voltage compatibility: Minimum 2.7V to 16V range support
Package form factor: 8-SOIC surface mount only
Leakage current specification: 100pA maximum

Substitute parts must maintain electrical performance within these defined boundaries. Parts that exceed any maximum specification or fall below minimum voltage support are not equivalent.

Parameter Comparison

Parameter	MAX323CSA	MAX323CSA+	ISL84541IBZ
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Renesas Electronics Corporation
Product Status	Obsolete	Active	Obsolete
Switch Circuit	SPST - NO	SPST - NO	SPST - NO
Number of Circuits	2	2	2
On-State Resistance (Max)	60Ohm	60Ohm	60Ohm
Channel-to-Channel Matching (ΔRon)	800mOhm	800mOhm	800mOhm
Supply Voltage Range (Single)	2.7V ~ 16V	2.7V ~ 16V	2.7V ~ 12V
Switch Time Ton (Max)	150ns	150ns	100ns
Switch Time Toff (Max)	100ns	100ns	75ns
Charge Injection	1pC	1pC	1pC
Channel Capacitance CS(off)	9pF	9pF	8pF
Channel Capacitance CD(off)	9pF	9pF	8pF
Leakage Current (IS(off) Max)	100pA	100pA	100pA
Crosstalk	-85dB @ 1MHz	-85dB @ 1MHz	-90dB @ 1MHz
Operating Temperature Range	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAX323CSA+ (Direct Manufacturer Upgrade)

The MAX323CSA+ is the active production equivalent from the same manufacturer. It maintains identical electrical specifications across all critical parameters: 60Ohm on-state resistance, 2.7V to 16V supply range, 2-circuit SPST-NO configuration, and 8-SOIC package form factor. The primary distinction is product status: MAX323CSA+ is active, whereas MAX323CSA is obsolete. Additionally, MAX323CSA+ carries ROHS3 compliance certification, whereas the original MAX323CSA is RoHS non-compliant. For new designs or system refreshes, MAX323CSA+ is the preferred selection due to ongoing manufacturer support and regulatory compliance.

ISL84541IBZ (Cross-Manufacturer Alternative)

The ISL84541IBZ from Renesas Electronics Corporation meets the core electrical requirements: 60Ohm on-state resistance, 2-circuit SPST-NO topology, and 8-SOIC package. However, this part operates within a reduced supply voltage range of 2.7V to 12V, compared to the MAX323CSA's 2.7V to 16V capability. The ISL84541IBZ exhibits faster switching times (100ns/75ns versus 150ns/100ns) and lower channel capacitance (8pF versus 9pF), which may provide performance advantages in specific signal-routing applications. The ISL84541IBZ is also ROHS3 compliant. This part is classified as obsolete. Selection of ISL84541IBZ requires verification that the target application operates within the 12V maximum supply constraint.

Frequently Asked Questions (FAQ)

Q: Can MAX323CSA+ be used as a direct replacement for MAX323CSA?

A: Yes. MAX323CSA+ is electrically and mechanically equivalent to MAX323CSA across all specified parameters. Both parts feature identical on-state resistance (60Ohm), supply voltage range (2.7V to 16V), circuit configuration (2-circuit SPST-NO), and 8-SOIC package dimensions. The primary difference is product status and RoHS compliance. MAX323CSA+ is the active production part and is recommended for all new applications.

Q: What is the key limitation of ISL84541IBZ as a substitute?

A: The ISL84541IBZ operates within a maximum supply voltage of 12V, whereas MAX323CSA supports up to 16V. Applications requiring supply voltages between 12V and 16V cannot use ISL84541IBZ without circuit redesign. All other electrical parameters—on-state resistance, circuit count, and package form factor—are compatible.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. MAX323CSA+, ISL84541IBZ, and MAX323CSA are all housed in 8-SOIC (0.154", 3.90mm Width) surface mount packages. PCB footprints are identical, and no layout modifications are required for mechanical substitution.

Q: What compliance certifications apply to each part?

A: MAX323CSA is RoHS non-compliant. MAX323CSA+ and ISL84541IBZ are both ROHS3 compliant. All three parts are REACH unaffected and carry EAR99 export classification. For applications subject to RoHS regulatory requirements, MAX323CSA+ or ISL84541IBZ must be selected.

Q: How do switching times differ between these parts?

A: MAX323CSA and MAX323CSA+ both specify maximum switching times of 150ns (Ton) and 100ns (Toff). ISL84541IBZ offers faster switching at 100ns (Ton) and 75ns (Toff). For applications with strict timing requirements, ISL84541IBZ may provide performance benefits, provided the 12V maximum supply voltage is acceptable.

Q: Are there any differences in leakage current or crosstalk performance?

A: Leakage current (IS(off)) is specified at 100pA maximum for all three parts. Crosstalk performance differs slightly: MAX323CSA and MAX323CSA+ specify -85dB @ 1MHz, while ISL84541IBZ specifies -90dB @ 1MHz, indicating superior isolation in the ISL84541IBZ.

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