MAX3490ECSA Equivalent & Substitute Parts

Part Overview

The MAX3490ECSA is a 1/1 full-duplex RS422/RS485 transceiver IC manufactured by Analog Devices Inc./Maxim Integrated in 8-SOIC surface mount packaging. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. The MAX3490ECSA operates at 3V to 3.6V supply voltage with a 10Mbps data rate and 50mV receiver hysteresis, designed for industrial communication applications requiring reliable serial interface functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX3490ECSA
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	10Mbps
Voltage - Supply	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	50 mV
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MAX3490ECSA is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS422/RS485 full-duplex transceiver
Number of Drivers/Receivers: 1/1 configuration
Package: 8-SOIC form factor
Supply Voltage Range: 3V ~ 3.6V
Data Rate: 10Mbps minimum
Receiver Hysteresis: 50mV nominal
Mounting Type: Surface Mount

Substitution Categories:

Parametric Equivalents maintain identical electrical specifications and differ only in product status (active vs. obsolete) and packaging format (tube vs. reel). These parts are direct functional replacements.

Upgrade Parts extend the operating temperature range from 0°C ~ 70°C to -40°C ~ 85°C while maintaining all other electrical parameters. These provide enhanced environmental performance.

Manufacturer Recommended Parts include variants with modified data rates (250kbps for ADM3488 series) or enhanced receiver hysteresis specifications (15mV for ISL83077EIBZA). These represent functional alternatives with different performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Protocol	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package	Product Status	RoHS Status
MAX3490ECSA	Analog Devices/Maxim	RS422, RS485	10Mbps	3V ~ 3.6V	0°C ~ 70°C	50 mV	8-SOIC	Obsolete	Non-compliant
MAX3490CSA+	Analog Devices/Maxim	RS422, RS485	10Mbps	3V ~ 3.6V	0°C ~ 70°C	50 mV	8-SOIC	Active	ROHS3 Compliant
MAX3490ECSA+	Analog Devices/Maxim	RS422, RS485	10Mbps	3V ~ 3.6V	0°C ~ 70°C	50 mV	8-SOIC	Active	ROHS3 Compliant
ADM3490EARZ	Analog Devices	RS422, RS485	10Mbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-SOIC	Active	ROHS3 Compliant
ADM3490EARZ-REEL7	Analog Devices	RS422, RS485	10Mbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-SOIC	Active	ROHS3 Compliant
ADM3490ARZ	Analog Devices	RS422, RS485	10Mbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-SOIC	Active	ROHS3 Compliant
ADM3490ARZ-REEL7	Analog Devices	RS422, RS485	10Mbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-SOIC	Active	ROHS3 Compliant
ADM3488ARZ	Analog Devices	RS422, RS485	250kbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-SOIC	Active	ROHS3 Compliant
ADM3488ARZ-REEL7	Analog Devices	RS422, RS485	250kbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-SOIC	Active	ROHS3 Compliant
ADM3488EARZ	Analog Devices	RS422, RS485	250kbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-SOIC	Active	ROHS3 Compliant
ISL83077EIBZA	Renesas Electronics	RS422, RS485	20Mbps	3V ~ 3.6V	-40°C ~ 85°C	15 mV	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents): MAX3490CSA+ and MAX3490ECSA+ are functionally identical to the MAX3490ECSA with identical electrical specifications. Both are active products with ROHS3 compliance, making them suitable for new designs and obsolescence mitigation. Selection between these two depends on packaging requirements: MAX3490CSA+ is supplied in tube packaging, while MAX3490ECSA+ is also tube-packaged.

Extended Temperature Range Upgrades: ADM3490EARZ, ADM3490EARZ-REEL7, ADM3490ARZ, and ADM3490ARZ-REEL7 maintain the 10Mbps data rate and 50mV hysteresis while extending operating temperature to -40°C ~ 85°C. These are appropriate for applications requiring wider environmental performance. Packaging options include tube and cut tape with Digi-Reel formats.

Lower Data Rate Alternatives: ADM3488ARZ, ADM3488ARZ-REEL7, and ADM3488EARZ operate at 250kbps instead of 10Mbps. These are suitable only for applications where the reduced data rate is acceptable and where lower speed operation is beneficial for noise immunity or power consumption.

Enhanced Performance Alternative: ISL83077EIBZA from Renesas Electronics provides 20Mbps data rate and 15mV receiver hysteresis, offering superior performance characteristics. This part is appropriate for applications requiring higher speed or improved noise margin. Moisture sensitivity level is 3 (168 hours) compared to level 1 for Analog Devices parts.

All recommended substitutes are ROHS3 compliant and active products, addressing the obsolescence status of the original MAX3490ECSA.

Frequently Asked Questions (FAQ)

Q: Can MAX3490CSA+ or MAX3490ECSA+ be used as direct replacements for MAX3490ECSA?

A: Yes. Both parts maintain identical electrical specifications including 10Mbps data rate, 50mV receiver hysteresis, 3V ~ 3.6V supply voltage, and 8-SOIC packaging. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Functional compatibility is complete.

Q: What is the difference between ADM3490EARZ and ADM3490ARZ?

A: Both parts are electrically identical with 10Mbps data rate and -40°C ~ 85°C operating temperature. The designation difference reflects internal Analog Devices product line variations. Both are suitable replacements for the MAX3490ECSA with extended temperature range.

Q: Can ADM3488 series parts substitute for MAX3490ECSA?

A: ADM3488 parts are functionally compatible in 8-SOIC packaging and supply voltage, but operate at 250kbps instead of 10Mbps. Substitution is valid only if the application does not require 10Mbps data rate performance. This represents a downgrade in speed capability.

Q: What is the significance of the REEL7 suffix?

A: The REEL7 suffix indicates cut tape packaging with Digi-Reel format, as opposed to tube packaging. Electrical specifications are identical; the difference is packaging and delivery format. Selection depends on procurement and assembly requirements.

Q: Is ISL83077EIBZA a suitable replacement?

A: ISL83077EIBZA is functionally compatible with identical supply voltage and 8-SOIC packaging. It provides enhanced performance with 20Mbps data rate and 15mV receiver hysteresis. Moisture sensitivity level is 3 (168 hours) versus level 1 for Analog Devices parts, which may affect storage and handling requirements.

Q: Why is the original MAX3490ECSA marked as obsolete?

A: Obsolescence indicates the part is no longer manufactured or supported by Analog Devices. Active equivalent parts (MAX3490CSA+, MAX3490ECSA+, ADM3490 series) are available to support existing designs and new applications.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts are ROHS3 compliant. The original MAX3490ECSA is RoHS non-compliant. This compliance difference is significant for applications subject to RoHS regulations.

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