MAX3490CSA RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX3490CSA is a 1/1 full-duplex RS422/RS485 transceiver IC manufactured by Analog Devices Inc./Maxim Integrated in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MAX3490CSA operates at 3V to 3.6V supply voltage with a 10 Mbps data rate and 50 mV receiver hysteresis, designed for industrial communication applications requiring reliable serial interface functionality.

Key Parameters

Parameter	MAX3490CSA
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	10 Mbps
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

Substitute Part Grouping Explanation

Substitution for the MAX3490CSA is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

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

Substitute Categories:

Parametric Equivalents (MAX3490CSA+, MAX3490ECSA+): Identical electrical specifications with active product status and improved RoHS3 compliance. These parts maintain the same 3V to 3.6V supply range, 10 Mbps data rate, and 0°C to 70°C operating temperature as the original part.

Upgrade Options (ADM3490ARZ, ADM3490ARZ-REEL7, ADM3490EARZ, ADM3490EARZ-REEL7): Extended operating temperature range (-40°C to 85°C) with identical electrical performance. These parts support the same 10 Mbps data rate and 3V to 3.6V supply voltage, offering broader environmental operation.

Manufacturer Recommended Alternatives (ADM3488 series): Lower data rate specification (250 kbps) with extended temperature range (-40°C to 85°C). These parts maintain the same supply voltage and package but operate at reduced bandwidth.

Cross-Manufacturer Option (DS8921M/NOPB by Texas Instruments): Different supply voltage requirement (4.5V to 5.5V) and higher receiver hysteresis (70 mV). This part is suitable only for designs with 5V supply rails.

Parameter Comparison

Part Number	Manufacturer	Product Status	Data Rate	Supply Voltage	Operating Temperature	Receiver Hysteresis	Packaging	RoHS Status
MAX3490CSA	Analog Devices/Maxim	Obsolete	10 Mbps	3V ~ 3.6V	0°C ~ 70°C	50 mV	Tube	RoHS Non-Compliant
MAX3490CSA+	Analog Devices/Maxim	Active	10 Mbps	3V ~ 3.6V	0°C ~ 70°C	50 mV	Tube	ROHS3 Compliant
MAX3490ECSA+	Analog Devices/Maxim	Active	10 Mbps	3V ~ 3.6V	0°C ~ 70°C	50 mV	Tube	ROHS3 Compliant
ADM3490ARZ	Analog Devices	Active	10 Mbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	Tube	ROHS3 Compliant
ADM3490ARZ-REEL7	Analog Devices	Active	10 Mbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	Cut Tape & Digi-Reel	ROHS3 Compliant
ADM3490EARZ	Analog Devices	Active	10 Mbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	Tube	ROHS3 Compliant
ADM3490EARZ-REEL7	Analog Devices	Active	10 Mbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	Cut Tape & Digi-Reel	ROHS3 Compliant
ADM3488ARZ	Analog Devices	Active	250 kbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	Tube	ROHS3 Compliant
ADM3488ARZ-REEL7	Analog Devices	Active	250 kbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	Cut Tape & Digi-Reel	ROHS3 Compliant
ADM3488EARZ	Analog Devices	Active	250 kbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	Tube	ROHS3 Compliant
DS8921M/NOPB	Texas Instruments	Active	Not Specified	4.5V ~ 5.5V	0°C ~ 70°C	70 mV	Tube	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Same Electrical Performance): MAX3490CSA+ and MAX3490ECSA+ provide identical electrical specifications to the obsolete MAX3490CSA with the advantage of active product status and ROHS3 compliance. These parts are the primary choice for direct substitution in existing designs without modification.

Extended Temperature Operation: The ADM3490 series (ARZ, ARZ-REEL7, EARZ, EARZ-REEL7) maintains the 10 Mbps data rate and 3V to 3.6V supply voltage while extending the operating temperature range to -40°C to 85°C. These parts are suitable for designs requiring broader environmental specifications and offer ROHS3 compliance with active product status.

Reduced Bandwidth Alternative: The ADM3488 series (ARZ, ARZ-REEL7, EARZ) operates at 250 kbps data rate with extended temperature range (-40°C to 85°C). Selection of this series is appropriate only for applications where the reduced bandwidth meets functional requirements.

Cross-Manufacturer Consideration: The DS8921M/NOPB from Texas Instruments operates at 4.5V to 5.5V supply voltage with 70 mV receiver hysteresis. This part is suitable only for designs with 5V supply rails and is not recommended for 3V to 3.6V systems.

Packaging Considerations: Tube packaging is standard for low-volume procurement. Cut Tape & Digi-Reel packaging (REEL7 variants) is available for higher-volume automated assembly operations.

Frequently Asked Questions (FAQ)

Q: Can MAX3490CSA+ be used as a direct replacement for MAX3490CSA? A: Yes. MAX3490CSA+ maintains identical electrical specifications including 10 Mbps data rate, 3V to 3.6V supply voltage, 50 mV receiver hysteresis, and 8-SOIC package. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between ADM3490 and ADM3488 series? A: The ADM3490 series supports 10 Mbps data rate, while the ADM3488 series operates at 250 kbps. Both maintain 3V to 3.6V supply voltage and 50 mV receiver hysteresis. The ADM3488 is suitable only for low-bandwidth applications.

Q: Can DS8921M/NOPB replace MAX3490CSA in a 3V system? A: No. DS8921M/NOPB requires 4.5V to 5.5V supply voltage and is not compatible with 3V to 3.6V systems. Additionally, it specifies 70 mV receiver hysteresis versus the 50 mV of MAX3490CSA.

Q: What is the difference between tube and Cut Tape & Digi-Reel packaging? A: Tube packaging is used for manual or low-volume pick-and-place operations. Cut Tape & Digi-Reel packaging (REEL7 variants) is designed for automated high-volume assembly with reel-based component feeders.

Q: Are all substitute parts ROHS3 compliant? A: All active substitute parts listed are ROHS3 compliant. The original MAX3490CSA is RoHS non-compliant. Compliance verification is required for applications subject to RoHS regulations.

Q: Can I use ADM3490EARZ-REEL7 in place of MAX3490CSA? A: Yes, with the advantage of extended operating temperature (-40°C to 85°C versus 0°C to 70°C), ROHS3 compliance, and active product status. Electrical performance at the original 0°C to 70°C range is identical.

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