MAX391C/D Equivalent & Substitute Parts

Part Overview

The MAX391C/D is a 4-circuit IC switch with SPST-NC (Single Pole Single Throw - Normally Closed) configuration and 35Ohm on-state resistance, manufactured by Analog Devices Inc./Maxim Integrated. This die-format component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design and procurement requirements. The MAX391C/D operates across single supply (3V to 15V) and dual supply (±3V to ±8V) configurations, making it suitable for analog signal switching applications requiring low on-state resistance and minimal crosstalk.

Key Parameters

Parameter	Value
Switch Circuit Type	SPST - NC
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	1:1
On-State Resistance (Max)	35Ohm
Channel-to-Channel Matching (ΔRon)	300mOhm (Typ)
Voltage - Supply, Single (V+)	3V ~ 15V
Voltage - Supply, Dual (V±)	±3V ~ 8V
Switch Time (Ton, Toff) (Max)	130ns, 75ns
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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX391C/D is based on electrical and mechanical parameter equivalence within the MAX391 product family. The primary substitute, MAX391CSE+, maintains identical electrical specifications across all critical switching parameters: 4-circuit SPST-NC configuration, 35Ohm on-state resistance, matching characteristics, supply voltage ranges, switching times, charge injection, capacitance, leakage current, and crosstalk performance.

The key differentiator between the main part and its substitute is packaging format and product status. The MAX391C/D is supplied as a die component in obsolete status, while MAX391CSE+ is packaged in 16-SOIC (0.154", 3.90mm Width) surface-mount format with active product status. Both parts share the same base product number (MAX391) and maintain full electrical compatibility.

Substitution is valid when the following conditions are met:

Identical switch circuit topology (SPST-NC, 4 circuits, 1:1 multiplexer configuration)
Matching on-state resistance specification (35Ohm maximum)
Equivalent supply voltage operating ranges (3V to 15V single, ±3V to ±8V dual)
Identical switching performance parameters (Ton, Toff, charge injection, capacitance, leakage)
Equivalent crosstalk performance (-85dB @ 1MHz)
Operating temperature range compatibility (0°C to 70°C)
RoHS3 compliance and MSL Level 1 rating maintained

Parameter Comparison

Parameter	MAX391C/D (Die)	MAX391CSE+ (16-SOIC)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Active
Switch Circuit	SPST - NC	SPST - NC
Number of Circuits	4	4
Multiplexer/Demultiplexer Circuit	1:1	1:1
On-State Resistance (Max)	35Ohm	35Ohm
Channel-to-Channel Matching (ΔRon)	300mOhm (Typ)	300mOhm
Voltage - Supply, Single (V+)	3V ~ 15V	3V ~ 15V
Voltage - Supply, Dual (V±)	±3V ~ 8V	±3V ~ 8V
Switch Time (Ton, Toff) (Max)	130ns, 75ns	130ns, 75ns
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	0°C ~ 70°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	Die	16-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The MAX391CSE+ is the direct equivalent substitute for the MAX391C/D. Selection of MAX391CSE+ is appropriate for new designs and procurement of replacement components due to its active product status and full electrical equivalence. The transition from die format (MAX391C/D) to 16-SOIC package (MAX391CSE+) represents a standard packaging evolution within the MAX391 product family, with no degradation of electrical performance.

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for industrial and commercial applications. The MSL Level 1 rating for both components indicates unlimited moisture sensitivity protection, suitable for standard storage and handling conditions.

Frequently Asked Questions (FAQ)

Q: Can MAX391CSE+ directly replace MAX391C/D in existing designs?

A: Yes. MAX391CSE+ provides full electrical equivalence to MAX391C/D across all specified parameters. The primary difference is packaging format: MAX391C/D is supplied as a die, while MAX391CSE+ is a 16-SOIC surface-mount package. Design integration requires accommodation of the different package footprint and pin configuration.

Q: What is the significance of the product status change from Obsolete to Active?

A: The obsolete status of MAX391C/D indicates discontinued manufacturing and limited availability. MAX391CSE+ maintains active production status, ensuring long-term supply chain reliability and availability for procurement.

Q: Are there any electrical performance differences between the two parts?

A: No. Both parts maintain identical electrical specifications: 35Ohm on-state resistance, 4-circuit SPST-NC configuration, matching characteristics, supply voltage ranges, switching times, charge injection, capacitance, leakage current, and crosstalk performance.

Q: What packaging considerations apply when transitioning from die to 16-SOIC format?

A: The MAX391C/D die format requires specialized die-attach and wire-bonding assembly processes. The MAX391CSE+ 16-SOIC package is compatible with standard surface-mount assembly equipment and processes, offering simplified integration into PCB designs.

Q: Do both parts meet the same compliance and regulatory requirements?

A: Yes. Both MAX391C/D and MAX391CSE+ are ROHS3 compliant, REACH unaffected, and rated MSL Level 1, ensuring equivalent regulatory and environmental compliance.

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