MAX391CPE Equivalent & Substitute Parts

Part Overview

The MAX391CPE is a 4-circuit IC switch with SPST-NC (Single Pole Single Throw - Normally Closed) configuration manufactured by Analog Devices Inc./Maxim Integrated. This component functions as a precision analog switch with 1:1 multiplexer/demultiplexer capability, designed for signal routing and switching applications requiring low on-state resistance and fast switching times.

The MAX391CPE is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support long-term product availability for applications currently utilizing this component.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SPST - NC (Single Pole Single Throw - Normally Closed)
Number of Circuits	4
Multiplexer/Demultiplexer Ratio	1:1
On-State Resistance (Max)	35Ω
Channel-to-Channel Matching (ΔRon)	300mΩ
Supply Voltage - Single (V+)	3V ~ 15V
Supply Voltage - Dual (V±)	±3V ~ 8V
Switch Time (Ton/Toff) Max	130ns / 75ns
Charge Injection	2pC
Channel Capacitance (CS(off) / CD(off))	9pF / 9pF
Leakage Current (IS(off)) Max	100pA
Crosstalk	-85dB @ 1MHz
Operating Temperature Range	0°C ~ 70°C (TA)
Package Type	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the MAX391CPE is determined by strict equivalence across the following critical parameters:

Switch circuit configuration: SPST - NC
Number of circuits: 4
Multiplexer/demultiplexer ratio: 1:1
On-state resistance: 35Ω maximum
Channel-to-channel matching: 300mΩ
Supply voltage ranges: 3V ~ 15V (single) and ±3V ~ 8V (dual)
Switching performance: Ton/Toff specifications of 130ns/75ns
Electrical characteristics: Charge injection, capacitance, leakage current, and crosstalk
Package configuration: 16-DIP through-hole mounting

Only parts meeting all these specifications are classified as direct substitutes. Packaging variations (such as tube versus alternative packaging formats) do not affect functional substitutability when electrical and mechanical parameters remain identical.

Parameter Comparison

Parameter	MAX391CPE (Main Part)	MAX391CPE+ (Substitute)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Switch Circuit	SPST - NC	SPST - NC
Number of Circuits	4	4
Multiplexer/Demultiplexer Ratio	1:1	1:1
On-State Resistance (Max)	35Ω	35Ω
Channel-to-Channel Matching (ΔRon)	300mΩ	300mΩ
Supply Voltage - Single (V+)	3V ~ 15V	3V ~ 15V
Supply Voltage - Dual (V±)	±3V ~ 8V	±3V ~ 8V
Switch Time Ton (Max)	130ns	130ns
Switch Time Toff (Max)	75ns	75ns
Charge Injection	2pC	2pC
Channel Capacitance CS(off)	9pF	9pF
Channel Capacitance CD(off)	9pF	9pF
Leakage Current IS(off) (Max)	100pA	100pA
Crosstalk	-85dB @ 1MHz	-85dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)
Package / Case	16-DIP (0.300", 7.62mm)	16-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The MAX391CPE+ is a direct functional equivalent to the MAX391CPE. Both parts are manufactured by Analog Devices Inc./Maxim Integrated and share identical electrical and mechanical specifications across all critical parameters.

The primary distinction between these parts is product status and regulatory compliance. The MAX391CPE is classified as obsolete, while the MAX391CPE+ maintains active product status. Additionally, the MAX391CPE+ achieves ROHS3 compliance, whereas the original MAX391CPE is RoHS non-compliant.

For new designs or applications requiring long-term component availability, the MAX391CPE+ is the appropriate selection. For legacy system maintenance where the original MAX391CPE is already integrated, the MAX391CPE+ provides functional continuity with improved regulatory compliance and ongoing manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can MAX391CPE+ be used as a direct replacement for MAX391CPE in existing applications?

A: Yes. The MAX391CPE+ is electrically and mechanically identical to the MAX391CPE. All functional parameters, including on-state resistance, switching times, supply voltage ranges, and package configuration, are equivalent. Direct substitution is supported without circuit modification.

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: Product status indicates manufacturer support and availability. The MAX391CPE is obsolete and no longer manufactured. The MAX391CPE+ is actively produced by Analog Devices Inc./Maxim Integrated, ensuring reliable supply chain access and ongoing technical support.

Q: Does the RoHS compliance difference affect functional compatibility?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical function. Both parts operate identically within their specified parameters. The MAX391CPE+ offers improved regulatory alignment for applications subject to RoHS requirements.

Q: Are there packaging differences between MAX391CPE and MAX391CPE+?

A: Both parts use 16-DIP through-hole packaging with identical physical dimensions (0.300", 7.62mm). The primary packaging difference is the supplier device package format (tube for MAX391CPE+), which does not affect electrical performance or PCB integration.

Q: What parameters must remain constant for substitution eligibility?

A: All electrical and mechanical parameters must match exactly: switch circuit configuration (SPST-NC), number of circuits (4), on-state resistance (35Ω), supply voltage ranges, switching times, capacitance values, leakage current, crosstalk performance, and 16-DIP package type. Any deviation in these specifications disqualifies a part as a direct substitute.

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