MAX318CSA IC Switch SPST-NO Equivalent & Substitute Parts

Part Overview

The MAX318CSA is a single-circuit SPST-NO (Single Pole Single Throw - Normally Open) analog switch manufactured by Analog Devices Inc./Maxim Integrated. This interface component operates with supply voltages ranging from 10V to 30V (single supply) or ±4.5V to ±20V (dual supply), featuring a maximum on-state resistance of 35Ohm and fast switching times of 175ns (Ton) and 145ns (Toff).

The MAX318CSA is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturing status and current compliance certifications.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NO
Multiplexer/Demultiplexer Circuit	1:1
Number of Circuits	1
On-State Resistance (Max)	35Ohm
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	3pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF
Current - Leakage (IS(off)) (Max)	250pA
Crosstalk	-85dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX318CSA is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must maintain identical specifications for:

Switch circuit topology (SPST - NO)
Circuit configuration (1:1 multiplexer/demultiplexer)
On-state resistance (35Ohm maximum)
Channel-to-channel matching (2Ohm maximum)
Supply voltage ranges (10V ~ 30V single; ±4.5V ~ 20V dual)
Switching performance (175ns Ton, 145ns Toff maximum)
Charge injection (3pC)
Channel capacitance (8pF off-state)
Leakage current (250pA maximum)
Crosstalk performance (-85dB @ 1MHz)
Operating temperature range (0°C ~ 70°C)
Physical package (8-SOIC with 3.90mm width)
Moisture sensitivity level (MSL 1)

The MAX318CSA+ meets all these criteria and is identified as a direct substitute.

Parameter Comparison

Parameter	MAX318CSA (Main Part)	MAX318CSA+ (Substitute)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Active
Switch Circuit	SPST - NO	SPST - NO
Multiplexer/Demultiplexer Circuit	1:1	1:1
Number of Circuits	1	1
On-State Resistance (Max)	35Ohm	35Ohm
Channel-to-Channel Matching (ΔRon)	2Ohm (Max)	2Ohm (Max)
Voltage - Supply, Single (V+)	10V ~ 30V	10V ~ 30V
Voltage - Supply, Dual (V±)	±4.5V ~ 20V	±4.5V ~ 20V
Switch Time (Ton, Toff) (Max)	175ns, 145ns	175ns, 145ns
Charge Injection	3pC	3pC
Channel Capacitance (CS(off), CD(off))	8pF, 8pF	8pF, 8pF
Current - Leakage (IS(off)) (Max)	250pA	250pA
Crosstalk	-85dB @ 1MHz	-85dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package	8-SOIC	8-SOIC
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
RoHS Status	RoHS non-compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
HTSUS	8542.39.0001	8542.39.0001

Engineering Selection Recommendations

The MAX318CSA+ is the direct substitute for the MAX318CSA. Both components are manufactured by Analog Devices Inc./Maxim Integrated and share identical electrical and mechanical specifications across all critical parameters.

The primary distinction between the two parts is product status and compliance certification. The MAX318CSA is obsolete, while the MAX318CSA+ maintains active manufacturing status. Additionally, the MAX318CSA+ is ROHS3 compliant, whereas the original MAX318CSA is RoHS non-compliant. Both parts maintain REACH Unaffected status and EAR99 export classification.

For new designs or component replenishment, the MAX318CSA+ is the appropriate selection due to its active product status and current regulatory compliance. The electrical and mechanical equivalence ensures direct substitution without circuit redesign or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can the MAX318CSA+ be used as a direct replacement for the MAX318CSA?

A: Yes. The MAX318CSA+ is electrically and mechanically equivalent to the MAX318CSA across all specified parameters, including on-state resistance, switching times, supply voltage ranges, and package configuration. Direct substitution is possible without circuit modification.

Q: What is the primary reason to transition from MAX318CSA to MAX318CSA+?

A: The MAX318CSA is classified as obsolete, creating supply chain risk. The MAX318CSA+ is actively manufactured and offers ROHS3 compliance, ensuring long-term availability and regulatory alignment for new designs and production runs.

Q: Are there any differences in packaging between these parts?

A: Both the MAX318CSA and MAX318CSA+ use the 8-SOIC package with identical physical dimensions (0.154" width, 3.90mm). The primary packaging difference is that the MAX318CSA+ is supplied in tube packaging, while the original part's packaging format is not specified in the available data.

Q: Do these parts have identical electrical performance?

A: Yes. The MAX318CSA and MAX318CSA+ share identical electrical specifications, including 35Ohm on-state resistance, 175ns/145ns switching times, 3pC charge injection, 8pF channel capacitance, 250pA maximum leakage current, and -85dB crosstalk at 1MHz.

Q: What supply voltage configurations are supported?

A: Both parts support single supply operation (10V ~ 30V) and dual supply operation (±4.5V ~ 20V), providing flexibility for various circuit topologies and power distribution architectures.

Q: Is the operating temperature range identical?

A: Yes. Both the MAX318CSA and MAX318CSA+ operate across the 0°C to 70°C temperature range, maintaining consistent performance across standard industrial and commercial operating conditions.

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