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 surface mount package. This component functions as a 2:1 multiplexer/demultiplexer with an on-state resistance of 35Ohm and operates across supply voltages of 2.7V to 15V (single supply) or ±2.7V to ±8V (dual supply). The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching functional circuit topology, electrical performance parameters, and package compatibility within acceptable tolerance ranges.

Key Parameters

Parameter	MAX394EAP+ Specification
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 @ 1MHz	-88dB
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SSOP (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MAX394EAP+ are classified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Switch circuit topology: SPDT configuration with 2:1 multiplexer/demultiplexer function
Number of circuits: 4 independent switch circuits
Channel-to-Channel Matching (ΔRon): 500mOhm tolerance
Operating temperature range: Minimum -40°C to 85°C coverage
RoHS3 compliance and REACH unaffected status

Secondary Compatibility Factors:

On-state resistance: Acceptable range 4.7Ohm to 35Ohm (lower resistance provides improved performance)
Supply voltage compatibility: Overlap with 2.7V ~ 15V single supply or ±2.7V ~ ±8V dual supply range
Package type: 20-pin SSOP or 20-pin TSSOP surface mount packages
Moisture sensitivity: MSL 1 or MSL 3 acceptable for standard applications

Substitutes Identified:

Group 1 - Direct Equivalents (Same Package, Identical Specifications):

MAX394EAP+ (Tube packaging)

Group 2 - Recommended Manufacturer Alternatives (Enhanced Performance):

ADG1434YRUZ (Tube packaging)
ADG1434YRUZ-REEL (Tape & Reel packaging)
ADG1434YRUZ-REEL7 (Cut Tape & Digi-Reel packaging)

Group 3 - Compatible Alternatives (Different Package, Acceptable Performance Trade-offs):

ISL43240IAZ (Tube packaging, Obsolete status)
ISL43240IAZ-T (Tape & Reel packaging, Active status)

Parameter Comparison

Parameter	MAX394EAP+	ADG1434YRUZ	ADG1434YRUZ-REEL	ADG1434YRUZ-REEL7	ISL43240IAZ	ISL43240IAZ-T
Manufacturer	Analog Devices/Maxim	Analog Devices	Analog Devices	Analog Devices	Renesas Electronics	Renesas Electronics
Switch Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Multiplexer Configuration	2:1	2:1	2:1	2:1	2:1	2:1
Number of Circuits	4	4	4	4	4	4
On-State Resistance (Max)	35Ohm	4.7Ohm	4.7Ohm	4.7Ohm	25Ohm	25Ohm
Channel-to-Channel Matching (ΔRon)	500mOhm	500mOhm	500mOhm	500mOhm	500mOhm	500mOhm
Voltage Supply - Single (V+)	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	±4.5V ~ ±16.5V	±4.5V ~ ±16.5V	±4.5V ~ ±16.5V	±2V ~ ±6V	±2V ~ ±6V
Switch Time Ton/Toff (Max)	130ns / 75ns	170ns / 75ns	170ns / 75ns	170ns / 75ns	65ns / 50ns	65ns / 50ns
-3dB Bandwidth	Not specified	200MHz	200MHz	200MHz	Not specified	Not specified
Charge Injection	5pC	-50pC	-50pC	-50pC	5pC (Max)	5pC (Max)
Channel Capacitance (CS(off) / CD(off))	12pF / 12pF	12pF / 22pF	12pF / 22pF	12pF / 22pF	10pF / 10pF	10pF / 10pF
Current Leakage IS(off) (Max)	200pA	300pA	300pA	300pA	200pA	200pA
Crosstalk @ 1MHz	-88dB	-70dB	-70dB	-70dB	-92dB	-92dB
Operating Temperature	-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 (0.209", 5.30mm)	20-TSSOP (0.173", 4.40mm)	20-TSSOP (0.173", 4.40mm)	20-TSSOP (0.173", 4.40mm)	20-SSOP (0.209", 5.30mm)	20-SSOP (0.209", 5.30mm)
Packaging Type	Tube	Tube	Tape & Reel (TR)	Cut Tape & Digi-Reel	Tube	Tape & Reel (TR)
Product Status	Active	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	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 the original specification must be maintained exactly. This part is in active production with ROHS3 compliance and MSL 1 rating, suitable for standard manufacturing environments without moisture sensitivity constraints.

For Enhanced Performance (Design Optimization Possible): The ADG1434YRUZ series (available in Tube, Tape & Reel, and Cut Tape & Digi-Reel packaging options) offers superior electrical characteristics: significantly lower on-state resistance (4.7Ohm vs. 35Ohm), extended operating temperature range (-40°C to 125°C vs. -85°C), and 200MHz bandwidth specification. All variants maintain ROHS3 compliance and MSL 1 rating. The ADG1434YRUZ-REEL7 variant provides the highest inventory availability (38,794 pcs) with Cut Tape & Digi-Reel packaging for high-volume production. Supply voltage compatibility requires verification: ADG1434 series minimum single supply is 5V (vs. MAX394 minimum 2.7V).

For Cost-Optimized Alternatives (Performance Trade-offs Acceptable): The ISL43240IAZ series (Renesas Electronics) provides functional equivalence with on-state resistance of 25Ohm and superior crosstalk performance (-92dB vs. -88dB). ISL43240IAZ-T is recommended over ISL43240IAZ due to active product status. Both variants maintain ROHS3 compliance but carry MSL 3 rating (168-hour moisture sensitivity), requiring controlled storage and handling. Supply voltage range is more restricted (2.7V ~ 12V single supply, ±2V ~ ±6V dual supply) compared to MAX394EAP+. This part is suitable for applications where lower on-state resistance and superior crosstalk isolation justify moisture sensitivity management.

Packaging Considerations:

MAX394EAP+ and ISL43240IAZ/ISL43240IAZ-T use 20-SSOP package (0.209", 5.30mm width)
ADG1434 series uses 20-TSSOP package (0.173", 4.40mm width), requiring PCB layout verification for pin pitch compatibility
Packaging variants (Tube, Tape & Reel, Cut Tape & Digi-Reel) affect procurement and assembly processes but do not alter electrical performance

Frequently Asked Questions (FAQ)

Q: Can ADG1434YRUZ be used as a direct drop-in replacement for MAX394EAP+?

A: ADG1434YRUZ is functionally equivalent but requires PCB layout verification. The ADG1434 uses 20-TSSOP package (0.173" width) while MAX394EAP+ uses 20-SSOP package (0.209" width). Pin pitch differs, necessitating footprint redesign. Electrical performance is superior (4.7Ohm vs. 35Ohm on-state resistance), but minimum supply voltage is 5V (vs. 2.7V for MAX394EAP+). Verify supply voltage compatibility before substitution.

Q: What is the difference between ADG1434YRUZ, ADG1434YRUZ-REEL, and ADG1434YRUZ-REEL7?

A: These three part numbers are electrically identical with identical electrical specifications. The differences are packaging and delivery format: ADG1434YRUZ is supplied in Tube packaging; ADG1434YRUZ-REEL is supplied in Tape & Reel (TR) format; ADG1434YRUZ-REEL7 is supplied in Cut Tape & Digi-Reel format. Selection depends on manufacturing process requirements and inventory management. ADG1434YRUZ-REEL7 offers the highest stock availability (38,794 pcs).

Q: Why is ISL43240IAZ listed as Obsolete while ISL43240IAZ-T is Active?

A: ISL43240IAZ (Tube packaging) is discontinued by Renesas Electronics. ISL43240IAZ-T (Tape & Reel packaging) remains in active production. Both parts share identical electrical specifications. For new designs, ISL43240IAZ-T is the recommended choice to ensure long-term supply availability and support.

Q: What does MSL 3 (168 Hours) mean for ISL43240IAZ-T?

A: Moisture Sensitivity Level 3 indicates the component absorbs moisture during storage and requires controlled handling. The 168-hour specification means the part can be exposed to ambient conditions (30°C, 60% relative humidity) for up to 168 hours before soldering without risk of delamination or cracking. After this period, the component must be baked at 125°C for 24 hours to remove absorbed moisture. MAX394EAP+ carries MSL 1 (Unlimited), requiring no moisture management. ISL43240IAZ-T substitution requires implementation of moisture control procedures in manufacturing.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. MAX394EAP+, ADG1434YRUZ (all variants), ISL43240IAZ, and ISL43240IAZ-T are all ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for EU and global markets.

Q: What is the maximum on-state resistance acceptable for substitution?

A: Substitutes with on-state resistance up to 35Ohm are functionally equivalent to MAX394EAP+. Lower resistance values (4.7Ohm for ADG1434, 25Ohm for ISL43240) provide improved signal integrity and reduced power dissipation. Higher resistance values would degrade performance and are not recommended.

Q: Can ISL43240IAZ-T replace MAX394EAP+ in low-voltage applications (2.7V supply)?

A: No. ISL43240IAZ-T minimum single supply voltage is 2.7V, matching MAX394EAP+. However, the dual supply range is ±2V to ±6V (vs. ±2.7V to ±8V for MAX394EAP+). For applications requiring ±2.7V to ±8V dual supply operation, ISL43240IAZ-T is not suitable. Verify actual supply voltage requirements before substitution.

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