MAX490ECSA Equivalent & Substitute Parts

Part Overview

The MAX490ECSA 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, with 14,669 units currently in stock. Due to its obsolete status, identifying equivalent and substitute parts is essential for ongoing system support, design updates, and long-term component availability planning. Substitute parts maintain functional compatibility while offering improved product status, compliance certifications, or enhanced electrical performance.

Key Parameters

Parameter	MAX490ECSA
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	70 mV
Data Rate	2.5 Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on their relationship to the MAX490ECSA:

Parametric Equivalents (MAX490CSA+, MAX490ECSA+): These parts maintain identical electrical specifications and package configuration. The primary distinction is product status (active vs. obsolete) and RoHS compliance certification. These are direct functional replacements suitable for new designs and inventory replenishment.

Direct Manufacturer Equivalents (LTC490CS8#PBF, LTC490CS8#TRPBF): These parts share the same base product family (LTC490) with identical core electrical parameters: 1/1 transceiver configuration, RS422/RS485 protocol support, full-duplex operation, 70 mV receiver hysteresis, 4.75V–5.25V supply voltage, and 0°C–70°C operating temperature range. Package designation differs (8-SO vs. 8-SOIC) but maintains equivalent physical footprint and pinout compatibility. These are suitable for direct substitution in existing designs.

Upgrade Options (LTC490IS8#PBF, LTC490IS8#TRPBF): These parts extend the operating temperature range to -40°C–85°C while maintaining all other electrical specifications. These are appropriate for applications requiring enhanced temperature performance.

Manufacturer Recommended Alternatives (LTC2863CS8-1#PBF, LTC2863CS8-1#TRPBF, LTC2863CS8-2#PBF, LTC2863CS8-2#TRPBF): These parts represent enhanced performance options with improved specifications: 150 mV receiver hysteresis (vs. 70 mV), expanded supply voltage range (3V–5.5V vs. 4.75V–5.25V), and significantly higher data rates (20 Mbps or 250 kbps vs. 2.5 Mbps). These are recommended for new designs requiring superior performance margins and modern compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	RoHS Status	Inventory
MAX490ECSA	Analog Devices/Maxim	Obsolete	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V–5.25V	0°C–70°C	8-SOIC	Non-compliant	14,669
MAX490CSA+	Analog Devices/Maxim	Active	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V–5.25V	0°C–70°C	8-SOIC	ROHS3 Compliant	6,900
MAX490ECSA+	Analog Devices/Maxim	Active	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V–5.25V	0°C–70°C	8-SOIC	ROHS3 Compliant	2,700
LTC490CS8#PBF	Analog Devices	Active	RS422, RS485	1/1	Full	70 mV	—	4.75V–5.25V	0°C–70°C	8-SO	ROHS3 Compliant	1,000,100
LTC490CS8#TRPBF	Analog Devices	Active	RS422, RS485	1/1	Full	70 mV	—	4.75V–5.25V	0°C–70°C	8-SO	ROHS3 Compliant	5,400
LTC490IS8#PBF	Analog Devices	Active	RS422, RS485	1/1	Full	70 mV	—	4.75V–5.25V	-40°C–85°C	8-SO	ROHS3 Compliant	2,600
LTC490IS8#TRPBF	Analog Devices	Active	RS422, RS485	1/1	Full	70 mV	—	4.75V–5.25V	-40°C–85°C	8-SO	ROHS3 Compliant	2,400
LTC2863CS8-1#PBF	Analog Devices	Active	RS422, RS485	1/1	Full	150 mV	20 Mbps	3V–5.5V	0°C–70°C	8-SO	ROHS3 Compliant	1,900
LTC2863CS8-1#TRPBF	Analog Devices	Active	RS422, RS485	1/1	Full	150 mV	20 Mbps	3V–5.5V	0°C–70°C	8-SO	ROHS3 Compliant	3,900
LTC2863CS8-2#PBF	Analog Devices	Active	RS422, RS485	1/1	Full	150 mV	250 kbps	3V–5.5V	0°C–70°C	8-SO	ROHS3 Compliant	1,970
LTC2863CS8-2#TRPBF	Analog Devices	Active	RS422, RS485	1/1	Full	150 mV	250 kbps	3V–5.5V	0°C–70°C	8-SO	ROHS3 Compliant	2,320

Engineering Selection Recommendations

For Direct Replacement (Existing Designs): MAX490CSA+ and MAX490ECSA+ are parametric equivalents with identical electrical specifications and package configuration. Both are active products with ROHS3 compliance certification, making them suitable for inventory replenishment and design continuity. MAX490ECSA+ maintains the exact part number suffix of the original, ensuring maximum compatibility.

For Designs Requiring Extended Temperature Range: LTC490IS8#PBF and LTC490IS8#TRPBF extend the operating temperature range to -40°C–85°C while maintaining all other electrical parameters. These are appropriate for applications in industrial or automotive environments requiring enhanced thermal performance.

For New Designs with Enhanced Performance Requirements: LTC2863CS8-1 and LTC2863CS8-2 variants offer superior specifications including 150 mV receiver hysteresis (improved noise immunity), expanded supply voltage range (3V–5.5V), and significantly higher data rates (20 Mbps or 250 kbps). All variants are active products with ROHS3 compliance. Selection between -1 and -2 variants depends on application data rate requirements: -1 for high-speed applications (20 Mbps), -2 for lower-speed applications (250 kbps).

Packaging Considerations: Tube packaging (#PBF) is suitable for standard component handling. Tape & Reel packaging (#TRPBF) is optimized for automated assembly processes and high-volume production.

Frequently Asked Questions (FAQ)

Q: Can MAX490CSA+ be used as a direct replacement for MAX490ECSA? A: Yes. MAX490CSA+ maintains identical electrical specifications (1/1 transceiver, RS422/RS485 protocol, 70 mV hysteresis, 2.5 Mbps data rate, 4.75V–5.25V supply, 0°C–70°C operating range) and package configuration (8-SOIC). The primary difference is product status (active vs. obsolete) and RoHS compliance certification.

Q: What is the difference between LTC490 and LTC2863 series? A: Both are 1/1 full-duplex RS422/RS485 transceivers in 8-SO packages. LTC2863 offers enhanced performance: 150 mV receiver hysteresis (vs. 70 mV), expanded supply voltage range (3V–5.5V vs. 4.75V–5.25V), and higher data rates (20 Mbps or 250 kbps vs. 2.5 Mbps). LTC2863 is recommended for new designs requiring improved noise immunity and performance margins.

Q: Are 8-SOIC and 8-SO packages physically compatible? A: Both packages maintain the same 0.154" (3.90mm) width and pinout compatibility. However, verify PCB footprint specifications with component datasheets before substitution, as minor dimensional variations may exist.

Q: Which substitute part should I select for industrial temperature applications? A: LTC490IS8#PBF or LTC490IS8#TRPBF extend the operating temperature range to -40°C–85°C, suitable for industrial and automotive environments. These maintain all other electrical specifications of the original MAX490ECSA.

Q: Is RoHS compliance required for my application? A: MAX490ECSA is RoHS non-compliant. All substitute parts listed (MAX490CSA+, MAX490ECSA+, LTC490 series, LTC2863 series) are ROHS3 compliant, meeting modern regulatory requirements for new designs and procurement.

Q: What is the inventory status of substitute parts? A: LTC490CS8#PBF has the highest inventory (1,000,100 units), followed by LTC490CS8#TRPBF (5,400 units) and LTC2863CS8-1#TRPBF (3,900 units). Parametric equivalents MAX490CSA+ and MAX490ECSA+ have lower inventory (6,900 and 2,700 units respectively).

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