MAX394EAP Equivalent & Substitute Parts

Part Overview

The MAX394EAP is a 4-circuit SPDT analog switch IC manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-SSOP package with 35Ohm on-state resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The part operates across a wide supply voltage range (2.7V to 15V single supply, or ±2.7V to ±8V dual supply) and is suitable for signal routing and multiplexing applications in industrial and consumer electronics.

Key Parameters

Parameter	MAX394EAP
Switch Circuit Configuration	SPDT (Single Pole Double Throw)
Number of Circuits	4
Multiplexer/Demultiplexer Circuit	2:1
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	-40°C ~ 85°C (TA)
Package / Case	20-SSOP (0.209", 5.30mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX394EAP is determined by the following critical parameters:

Switch Circuit & Configuration: SPDT topology with 2:1 multiplexer/demultiplexer function and 4 circuits
On-State Resistance: Maximum 35Ohm (determines signal integrity and power dissipation)
Supply Voltage Compatibility: Single supply 2.7V ~ 15V or dual supply ±2.7V ~ 8V
Package Type: 20-SSOP form factor (0.209", 5.30mm Width) for PCB layout compatibility
Electrical Performance: Switch timing, charge injection, and crosstalk specifications

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (Identical Specifications)

MAX394EAP+ (packaging variant, active product status)

Category 2: Functional Alternatives (Modified Specifications)

ADG1434YRUZ series (lower on-state resistance, higher operating temperature, different package)
ISL43240IAZ series (lower on-state resistance, different supply voltage range, same package)

Parameter Comparison

Parameter	MAX394EAP	MAX394EAP+	ADG1434YRUZ	ADG1434YRUZ-REEL	ADG1434YRUZ-REEL7	ISL43240IAZ	ISL43240IAZ-T
Switch Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Number of Circuits	4	4	4	4	4	4	4
Multiplexer/Demultiplexer	2:1	2:1	2:1	2:1	2:1	2:1	2:1
On-State Resistance (Max)	35Ohm	35Ohm	4.7Ohm	4.7Ohm	4.7Ohm	25Ohm	25Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm	500mOhm	500mOhm	500mOhm	500mOhm	500mOhm	500mOhm
Voltage - Supply, Single (V+)	2.7V ~ 15V	2.7V ~ 15V	5V ~ 16.5V	5V ~ 16.5V	5V ~ 16.5V	2.7V ~ 12V	2.7V ~ 12V
Voltage - Supply, Dual (V±)	±2.7V ~ 8V	±2.7V ~ 8V	±4.5V ~ 16.5V	±4.5V ~ 16.5V	±4.5V ~ 16.5V	±2V ~ 6V	±2V ~ 6V
Switch Time Ton (Max)	130ns	130ns	170ns	170ns	170ns	65ns	65ns
Switch Time Toff (Max)	75ns	75ns	75ns	75ns	75ns	50ns	50ns
Charge Injection	5pC	5pC	-50pC	-50pC	-50pC	5pC (Max)	5pC (Max)
Channel Capacitance CS(off)	12pF	12pF	12pF	12pF	12pF	10pF	10pF
Channel Capacitance CD(off)	12pF	12pF	22pF	22pF	22pF	10pF	10pF
Current - Leakage (IS(off)) (Max)	200pA	200pA	300pA	300pA	300pA	200pA	200pA
Crosstalk	-88dB @ 1MHz	-88dB @ 1MHz	-70dB @ 1MHz	-70dB @ 1MHz	-70dB @ 1MHz	-92dB @ 1MHz	-92dB @ 1MHz
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SSOP	20-SSOP	20-TSSOP	20-TSSOP	20-TSSOP	20-SSOP	20-SSOP
Product Status	Obsolete	Active	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required): Select MAX394EAP+ when active product status and identical electrical specifications are required. This part maintains full compatibility with existing PCB layouts and firmware, with the advantage of active manufacturing status and unlimited moisture sensitivity rating.

For New Designs with Enhanced Performance: The ADG1434YRUZ series (available in tube, tape & reel, and cut tape packaging variants) offers significantly lower on-state resistance (4.7Ohm vs. 35Ohm), extended operating temperature range (-40°C to 125°C), and higher bandwidth (200MHz). These improvements reduce signal distortion and power dissipation. However, the 20-TSSOP package differs from the original 20-SSOP, requiring PCB layout modification. Supply voltage range differs (5V ~ 16.5V single supply vs. 2.7V ~ 15V), necessitating circuit verification for low-voltage applications.

For Pin-Compatible Substitution with Moderate Performance Trade-offs: The ISL43240IAZ-T (active status) maintains the 20-SSOP package and similar supply voltage range (2.7V ~ 12V single supply). On-state resistance is 25Ohm, providing a middle ground between the original 35Ohm and the ADG1434 series. Crosstalk performance is superior (-92dB vs. -88dB). The ISL43240IAZ variant is obsolete; ISL43240IAZ-T is the active equivalent with tape & reel packaging. Moisture sensitivity level is MSL 3 (168 hours), requiring controlled storage conditions compared to the original MSL 1.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original MAX394EAP. ECCN classification remains EAR99 for all variants.

Frequently Asked Questions (FAQ)

Q: Can MAX394EAP+ be used as a direct drop-in replacement for MAX394EAP? A: Yes. MAX394EAP+ is electrically and mechanically identical to MAX394EAP, differing only in packaging format (tube vs. unspecified original packaging). Both use the 20-SSOP package and share identical electrical specifications. The primary advantage of MAX394EAP+ is active product status, ensuring continued availability.

Q: What are the key differences between MAX394EAP and ADG1434YRUZ? A: The ADG1434YRUZ has significantly lower on-state resistance (4.7Ohm vs. 35Ohm), reducing signal attenuation and power dissipation. It operates at higher temperatures (-40°C to 125°C vs. -40°C to 85°C) and includes 200MHz bandwidth specification. However, it uses a different package (20-TSSOP vs. 20-SSOP), requires higher minimum supply voltage (5V vs. 2.7V single supply), and has higher leakage current (300pA vs. 200pA). PCB redesign is necessary for package compatibility.

Q: Is ISL43240IAZ-T suitable for low-voltage applications below 2.7V? A: No. ISL43240IAZ-T minimum single supply voltage is 2.7V, matching the original MAX394EAP. However, dual supply minimum is ±2V (vs. ±2.7V for MAX394EAP), providing slightly more flexibility in bipolar supply designs. Verify specific circuit requirements before selection.

Q: What is the impact of MSL 3 rating on ISL43240IAZ-T compared to MSL 1 on MAX394EAP? A: MSL 3 (168 hours) requires controlled storage and handling conditions. Components must be stored in dry conditions and used within 168 hours of package opening. MSL 1 (unlimited) has no such restrictions. For high-volume production or long-term inventory, this difference may impact supply chain logistics and storage costs.

Q: Can ADG1434YRUZ variants be used interchangeably? A: ADG1434YRUZ, ADG1434YRUZ-REEL, and ADG1434YRUZ-REEL7 are electrically identical, differing only in packaging format (tube, tape & reel, and cut tape with Digi-Reel respectively). Selection depends on assembly process requirements and volume. All three are active products with identical electrical specifications.

Q: Which substitute offers the best crosstalk performance? A: ISL43240IAZ and ISL43240IAZ-T provide the best crosstalk performance at -92dB @ 1MHz, compared to -88dB for MAX394EAP and -70dB for ADG1434YRUZ variants. This makes ISL43240IAZ-T preferable for applications requiring minimal signal coupling between channels.

Q: Are all substitute parts ROHS3 compliant? A: Yes. MAX394EAP+, all ADG1434YRUZ variants, and both ISL43240IAZ variants are ROHS3 compliant and REACH unaffected, maintaining environmental compliance consistency with the original MAX394EAP.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message