MAX394CPP Equivalent & Substitute Parts

Part Overview

The MAX394CPP is a 4-circuit SPDT analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-DIP package. This component functions as a 2:1 multiplexer/demultiplexer with 35Ohm on-state resistance, designed for signal routing and switching applications requiring low on-resistance and fast switching times. The MAX394CPP is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Switch Circuit Configuration	SPDT (Single Pole Double Throw)
Multiplexer/Demultiplexer Circuit	2:1
Number of Circuits	4
On-State Resistance (Max)	35Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm
Voltage - Supply, Single (V+)	2.7V ~ 15V
Voltage - Supply, Dual (V±)	±2.7V ~ 8V
Switch Time (Ton, Toff) (Max)	130ns, 75ns
Charge Injection	5pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF
Current - Leakage (IS(off)) (Max)	200pA
Crosstalk	-88dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	20-DIP (0.300", 7.62mm)
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MAX394CPP is determined by strict equivalence in the following core parameters:

Switch topology (SPDT 2:1 multiplexer configuration with 4 circuits) forms the primary functional requirement. The ADG333ABNZ maintains identical circuit topology and pin count, ensuring direct functional compatibility.

Package compatibility requires matching 20-DIP through-hole form factor. Both the MAX394CPP and ADG333ABNZ use 20-PDIP packaging, enabling direct socket replacement without PCB redesign.

Electrical parameter tolerance is established through on-state resistance, supply voltage ranges, and switching characteristics. The ADG333ABNZ operates within broader supply voltage ranges (3V ~ 30V single supply vs. 2.7V ~ 15V) and extended temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C), providing enhanced operational flexibility while maintaining functional compatibility for applications within the MAX394CPP's original specifications.

Parameter Comparison

Parameter	MAX394CPP	ADG333ABNZ
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc.
Product Status	Obsolete	Active
Switch Circuit	SPDT	SPDT
Multiplexer/Demultiplexer Circuit	2:1	2:1
Number of Circuits	4	4
On-State Resistance (Max)	35Ohm	45Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm	5Ohm
Voltage - Supply, Single (V+)	2.7V ~ 15V	3V ~ 30V
Voltage - Supply, Dual (V±)	±2.7V ~ 8V	±3V ~ 20V
Switch Time (Ton, Toff) (Max)	130ns, 75ns	90ns, 80ns (Typ)
Charge Injection	5pC	2pC
Channel Capacitance (CS(off), CD(off))	12pF, 12pF	7pF
Current - Leakage (IS(off)) (Max)	200pA	250pA
Crosstalk	-88dB @ 1MHz	-85dB @ 1MHz
Operating Temperature	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The ADG333ABNZ is the manufacturer-recommended substitute for the MAX394CPP. Both components share identical functional topology (4-circuit SPDT 2:1 multiplexer) and package form factor (20-DIP), enabling direct replacement in existing designs.

The ADG333ABNZ offers improved product status (Active vs. Obsolete), ensuring long-term availability and supply chain stability. The part achieves ROHS3 compliance, meeting current environmental and regulatory requirements, whereas the MAX394CPP is RoHS non-compliant.

Performance characteristics of the ADG333ABNZ demonstrate enhancements in several parameters: reduced charge injection (2pC vs. 5pC), lower channel capacitance (7pF vs. 12pF), and faster typical switching times (90ns/80ns vs. 130ns/75ns). Extended supply voltage ranges (3V ~ 30V single supply, ±3V ~ 20V dual supply) and broader operating temperature range (-40°C ~ 85°C) provide operational flexibility beyond the original MAX394CPP specifications.

On-state resistance increases from 35Ohm to 45Ohm maximum, and channel-to-channel matching tolerance widens from 500mOhm to 5Ohm. These parameter shifts remain within acceptable substitution criteria for most signal routing and multiplexing applications operating within the MAX394CPP's original voltage and temperature specifications.

Frequently Asked Questions (FAQ)

Q: Can the ADG333ABNZ directly replace the MAX394CPP without PCB modifications?

A: Yes. Both components use identical 20-DIP (0.300", 7.62mm) through-hole packaging with matching pin configurations, enabling direct socket replacement without PCB redesign.

Q: What are the key electrical differences between these parts?

A: The ADG333ABNZ has higher on-state resistance (45Ohm vs. 35Ohm maximum) and wider channel-to-channel matching tolerance (5Ohm vs. 500mOhm). The ADG333ABNZ provides superior charge injection (2pC vs. 5pC) and lower channel capacitance (7pF vs. 12pF). Supply voltage and temperature ranges are extended in the ADG333ABNZ.

Q: Is the ADG333ABNZ suitable for applications requiring the MAX394CPP's 35Ohm on-state resistance specification?

A: Applications must evaluate whether 45Ohm on-state resistance is acceptable for their signal path impedance and attenuation requirements. The 10Ohm increase may impact signal integrity in high-frequency or low-impedance applications.

Q: What compliance advantages does the ADG333ABNZ offer?

A: The ADG333ABNZ achieves ROHS3 compliance and maintains REACH Unaffected status, meeting current environmental regulations. The MAX394CPP is RoHS non-compliant, limiting use in regulated applications and new designs.

Q: Are there temperature range considerations for substitution?

A: The ADG333ABNZ operates from -40°C ~ 85°C, extending below and above the MAX394CPP's 0°C ~ 70°C range. Applications operating within the original MAX394CPP temperature range experience no compatibility issues.

Q: What is the impact of the ADG333ABNZ's wider channel-to-Channel matching tolerance?

A: The 5Ohm matching tolerance (vs. 500mOhm) may affect applications requiring precise channel-to-channel resistance uniformity. Signal routing applications with relaxed matching requirements experience no functional impact.

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