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 through-hole package. This component functions as a 2:1 multiplexer/demultiplexer with 35Ohm on-state resistance and operates across single supply (2.7V to 15V) or dual supply (±2.7V to ±8V) configurations. The MAX394CPP+ is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Switch Circuit Type	SPDT (Single Pole Double Throw)
Multiplexer/Demultiplexer Configuration	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
Package / Case	20-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MAX394CPP+ is determined by the following critical parameters:

Identical switch circuit topology (SPDT)
Identical multiplexer configuration (2:1)
Identical number of circuits (4)
Compatible package type (20-DIP through-hole)
On-state resistance within acceptable application limits
Supply voltage ranges that meet or exceed the original specification
Operating temperature range suitable for the target application
RoHS and regulatory compliance alignment

The ADG333ABNZ qualifies as a direct substitute based on matching all structural and functional requirements while offering improved electrical performance characteristics.

Parameter Comparison

Parameter	MAX394CPP+	ADG333ABNZ	Compatibility Notes
Switch Circuit	SPDT	SPDT	Identical
Multiplexer/Demultiplexer Configuration	2:1	2:1	Identical
Number of Circuits	4	4	Identical
On-State Resistance (Max)	35Ohm	45Ohm	ADG333ABNZ higher; acceptable for most applications
Channel-to-Channel Matching (ΔRon)	500mOhm	5Ohm	ADG333ABNZ has wider tolerance
Voltage - Supply, Single (V+)	2.7V ~ 15V	3V ~ 30V	ADG333ABNZ exceeds original range
Voltage - Supply, Dual (V±)	±2.7V ~ ±8V	±3V ~ ±20V	ADG333ABNZ exceeds original range
Switch Time (Ton, Toff) (Max)	130ns, 75ns	90ns, 80ns (Typ)	ADG333ABNZ faster switching
Charge Injection	5pC	2pC	ADG333ABNZ lower charge injection
Channel Capacitance (CS(off), CD(off))	12pF, 12pF	7pF	ADG333ABNZ lower capacitance
Current - Leakage (IS(off)) (Max)	200pA	250pA	ADG333ABNZ slightly higher leakage
Crosstalk	-88dB @ 1MHz	-85dB @ 1MHz	MAX394CPP+ has better isolation
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	ADG333ABNZ wider temperature range
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	Identical pin-compatible package
Product Status	Obsolete	Active	ADG333ABNZ actively manufactured
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical compliance

Engineering Selection Recommendations

The ADG333ABNZ is the qualified substitute for the obsolete MAX394CPP+. Selection is based on:

Pin-compatible 20-DIP package enabling direct board-level replacement
Active product status ensuring long-term availability and supply chain continuity
ROHS3 compliance matching the original part's regulatory standing
Expanded supply voltage ranges (3V to 30V single, ±3V to ±20V dual) providing greater design flexibility
Extended operating temperature range (-40°C to 85°C) supporting broader application environments
Improved electrical performance in switching speed, charge injection, and channel capacitance

Applications requiring the original MAX394CPP+ specifications should evaluate whether the ADG333ABNZ's higher on-state resistance (45Ohm vs. 35Ohm) and slightly reduced crosstalk isolation (-85dB vs. -88dB) are acceptable for the intended circuit function.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts use identical 20-DIP through-hole packaging with matching pinouts, enabling direct socket replacement without PCB redesign.

Q: What is the impact of the 10Ohm increase in on-state resistance (35Ohm to 45Ohm)?

A: The ADG333ABNZ's 45Ohm maximum on-state resistance is suitable for most analog switching applications. Applications with strict impedance matching requirements or high-current signal paths should verify compatibility through circuit simulation or prototype testing.

Q: Does the ADG333ABNZ support the same supply voltage range as the MAX394CPP+?

A: The ADG333ABNZ exceeds the original specification. It operates from 3V to 30V (single supply) and ±3V to ±20V (dual supply), compared to the MAX394CPP+ range of 2.7V to 15V (single) and ±2.7V to ±8V (dual). Designs using the original 2.7V minimum supply should verify operation at the ADG333ABNZ's 3V minimum threshold.

Q: Are there differences in leakage current between these parts?

A: The ADG333ABNZ has a maximum leakage current of 250pA compared to the MAX394CPP+ at 200pA. This 50pA difference is negligible for most applications but should be evaluated in precision analog circuits with extremely low-current signal paths.

Q: What is the temperature operating range difference?

A: The MAX394CPP+ operates from 0°C to 70°C, while the ADG333ABNZ operates from -40°C to 85°C. The ADG333ABNZ is suitable for extended temperature applications including industrial and automotive environments.

Q: Are both parts RoHS compliant?

A: Yes. Both the MAX394CPP+ and ADG333ABNZ are ROHS3 compliant, meeting current environmental and regulatory requirements.

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