MAX397CPI Equivalent & Substitute Parts

Part Overview

The MAX397CPI is a dual 8:1 analog multiplexer/demultiplexer IC manufactured by Analog Devices Inc./Maxim Integrated. This component features two independent 8:1 switch circuits with 100Ohm on-state resistance, designed for signal routing and switching applications in analog systems. The device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Multiplexer/Demultiplexer Circuit Configuration	8:1
Number of Circuits	2
On-State Resistance (Max)	100Ohm
Channel-to-Channel Matching (ΔRon)	1.8Ohm
Voltage - Supply, Single (V+)	2.7V ~ 16V
Voltage - Supply, Dual (V±)	±2.7V ~ 8V
Switch Time (Ton, Toff) (Max)	150ns, 150ns
Charge Injection	2pC
Channel Capacitance (CS(off), CD(off))	11pF, 80pF
Current - Leakage (IS(off)) (Max)	100pA
Crosstalk	-92dB @ 100kHz
Operating Temperature	0°C ~ 70°C
Package / Case	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MAX397CPI is determined by strict equivalence across the following critical parameters:

Functional Architecture: Both the main part and substitute must provide dual 8:1 multiplexer/demultiplexer circuits with identical channel configuration.

Electrical Characteristics: On-state resistance must remain at 100Ohm maximum. Channel-to-channel matching, charge injection, and crosstalk performance must meet or exceed the original specification.

Package Compatibility: The 28-DIP through-hole package format must be maintained to ensure mechanical and electrical compatibility with existing PCB layouts.

Supply Voltage Range: The substitute part must support the required supply voltage operating range. Expanded voltage ranges in substitute parts do not disqualify compatibility.

Thermal Performance: Operating temperature range must encompass or exceed the original specification to ensure reliable operation across the intended application environment.

The MAX307EPI+ qualifies as a direct substitute based on these criteria. It maintains the dual 8:1 circuit configuration, 100Ohm on-state resistance, identical package format, and compatible electrical performance characteristics.

Parameter Comparison

Parameter	MAX397CPI	MAX307EPI+	Compatibility Notes
Multiplexer/Demultiplexer Circuit	8:1	8:1	Identical
Number of Circuits	2	2	Identical
On-State Resistance (Max)	100Ohm	100Ohm	Identical
Channel-to-Channel Matching (ΔRon)	1.8Ohm	1.5Ohm	Substitute exceeds specification
Voltage - Supply, Single (V+)	2.7V ~ 16V	5V ~ 30V	Substitute range is broader; verify application requirements
Voltage - Supply, Dual (V±)	±2.7V ~ 8V	±4.5V ~ 20V	Substitute range is broader; verify application requirements
Switch Time (Ton, Toff) (Max)	150ns, 150ns	200ns, 150ns	Ton slightly longer in substitute; Toff identical
Charge Injection	2pC	2pC	Identical
Channel Capacitance (CS(off), CD(off))	11pF, 80pF	8pF, 65pF	Substitute shows lower capacitance; improved performance
Current - Leakage (IS(off)) (Max)	100pA	500pA	Substitute has higher leakage; verify application sensitivity
Crosstalk	-92dB @ 100kHz	-92dB @ 100kHz	Identical
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	Substitute provides extended range
Package / Case	28-DIP (0.600", 15.24mm)	28-DIP (0.600", 15.24mm)	Identical
Mounting Type	Through Hole	Through Hole	Identical
Product Status	Obsolete	Active	Substitute is in active production
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute meets current environmental standards

Engineering Selection Recommendations

The MAX307EPI+ is the qualified substitute for the obsolete MAX397CPI based on functional equivalence and electrical compatibility. The substitute maintains the core dual 8:1 multiplexer architecture and identical on-state resistance specification required for direct replacement.

Key advantages of the MAX307EPI+ include active product status, ensuring long-term availability and supply chain continuity. The device achieves ROHS3 compliance, meeting current environmental and regulatory requirements for new designs and manufacturing processes.

The substitute demonstrates improved channel capacitance performance (8pF and 65pF versus 11pF and 80pF), which may provide benefits in high-frequency applications. However, the MAX307EPI+ exhibits higher leakage current (500pA maximum versus 100pA) and slightly extended turn-on time (200ns versus 150ns). Applications with stringent leakage or timing requirements must evaluate these parameter differences against system specifications.

The expanded supply voltage range (5V ~ 30V single supply, ±4.5V ~ 20V dual supply) and extended operating temperature range (-40°C ~ 85°C) provide greater design flexibility for diverse application environments.

Frequently Asked Questions (FAQ)

Q: Can the MAX307EPI+ directly replace the MAX397CPI in existing designs?

A: The MAX307EPI+ is functionally equivalent for the core multiplexer/demultiplexer operation. Both devices provide dual 8:1 circuits in identical 28-DIP packages with 100Ohm on-state resistance. However, verify that your application can tolerate the higher leakage current (500pA versus 100pA) and slightly longer turn-on time (200ns versus 150ns) of the substitute part.

Q: What are the key differences between these parts?

A: The primary differences are product status (MAX397CPI is obsolete; MAX307EPI+ is active), RoHS compliance (MAX307EPI+ is ROHS3 compliant), leakage current (500pA versus 100pA), and switch timing (Ton 200ns versus 150ns). The MAX307EPI+ offers improved channel capacitance and extended operating temperature range.

Q: Are the package dimensions identical?

A: Yes. Both parts use the 28-DIP package with 0.600" (15.24mm) body width. Through-hole mounting is identical, ensuring PCB layout compatibility.

Q: What supply voltages does the MAX307EPI+ support?

A: The MAX307EPI+ supports single supply operation from 5V to 30V and dual supply operation from ±4.5V to ±20V. Verify that your application voltage levels fall within these ranges.

Q: Is the MAX307EPI+ suitable for low-leakage applications?

A: The MAX307EPI+ has a maximum leakage current of 500pA, which is higher than the MAX397CPI (100pA). For applications requiring ultra-low leakage, evaluate whether this specification meets your system requirements.

Q: What is the availability status of the MAX307EPI+?

A: The MAX307EPI+ is an active product in production, ensuring reliable long-term availability and supply chain support compared to the obsolete MAX397CPI.

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