MAX485ECSA Equivalent & Substitute Parts

Part Overview

The MAX485ECSA is a half-duplex RS422/RS485 transceiver manufactured by Analog Devices Inc./Maxim Integrated in 8-SOIC surface mount packaging. This interface IC operates at 2.5 Mbps data rate with 1/1 driver/receiver configuration and 70 mV receiver hysteresis. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functionality.

Key Parameters

Parameter	MAX485ECSA
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Data Rate	2.5 Mbps
Receiver Hysteresis	70 mV
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
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 for the MAX485ECSA is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS422/RS485 half-duplex
Number of Drivers/Receivers: 1/1 configuration
Package: 8-SOIC form factor (0.154", 3.90mm Width)
Receiver Hysteresis: 70 mV
Data Rate: 2.5 Mbps minimum
Supply Voltage: 4.75V ~ 5.25V
Mounting Type: Surface Mount

Substitute parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalents maintain identical electrical specifications and 8-SOIC packaging. These include MAX1487CSA+, MAX1487ECSA+, MAX481CSA+, MAX481ECSA+, and MAX485ECSA+ from Analog Devices/Maxim Integrated. All are active products with RoHS3 compliance.

Direct Substitutes provide functional equivalence with allowable parameter variations. SN65HVD485EDGK (Texas Instruments) and ST485ECDR (STMicroelectronics) maintain the same protocol, driver/receiver count, duplex mode, and 8-SOIC package while operating within compatible voltage and temperature ranges.

Upgrade Options offer enhanced performance or extended operating temperature ranges. ST485ERBDR and ADM1485ARZ/ADM1485ARZ-REEL provide higher data rates (5 Mbps and 30 Mbps respectively) and extended temperature operation (-40°C ~ 85°C) while maintaining core electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Receiver Hysteresis	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
MAX485ECSA	Analog Devices/Maxim	RS422, RS485	1/1	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Obsolete	Non-compliant
MAX1487CSA+	Analog Devices/Maxim	RS422, RS485	1/1	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
MAX1487ECSA+	Analog Devices/Maxim	RS422, RS485	1/1	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
MAX481CSA+	Analog Devices/Maxim	RS422, RS485	1/1	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
MAX481ECSA+	Analog Devices/Maxim	RS422, RS485	1/1	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
MAX485ECSA+	Analog Devices/Maxim	RS422, RS485	1/1	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
SN65HVD485EDGK	Texas Instruments	RS422, RS485	1/1	10 Mbps	30 mV	4.5V ~ 5.5V	-40°C ~ 85°C	8-VSSOP	Obsolete	ROHS3 Compliant
ST485ECDR	STMicroelectronics	RS422, RS485	1/1	5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
ST485ERBDR	STMicroelectronics	RS422, RS485	1/1	2.5 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM1485ARZ	Analog Devices	RS422, RS485	1/1	30 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM1485ARZ-REEL	Analog Devices	RS422, RS485	1/1	30 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select MAX1487ECSA+, MAX481ECSA+, or MAX485ECSA+ from Analog Devices/Maxim Integrated. These parts maintain exact electrical and thermal specifications as the obsolete MAX485ECSA while offering active product status and RoHS3 compliance. All three are available in 8-SOIC packaging with identical supply voltage and operating temperature ranges.

For Active Product Status with Extended Temperature Range: ST485ERBDR from STMicroelectronics provides the same electrical specifications and 8-SOIC package as the original part while extending operating temperature to -40°C ~ 85°C. This option is suitable for applications requiring wider temperature operation without performance enhancement.

For Enhanced Performance Requirements: ADM1485ARZ or ADM1485ARZ-REEL from Analog Devices offer 30 Mbps data rate capability with extended temperature operation (-40°C ~ 85°C) while maintaining the same 8-SOIC package and supply voltage specifications. These parts are recommended when system designs can benefit from higher data rate capability.

For Alternative Manufacturer Sourcing: ST485ECDR from STMicroelectronics provides 5 Mbps data rate with identical receiver hysteresis and package specifications, offering a mid-range performance option with active product status and RoHS3 compliance.

All recommended substitutes maintain RoHS3 compliance and active product status, addressing the obsolescence of the original MAX485ECSA.

Frequently Asked Questions (FAQ)

Q: Can MAX485ECSA be directly replaced with MAX1487ECSA+ or MAX481ECSA+? A: Yes. MAX1487ECSA+ and MAX481ECSA+ are parametric equivalents with identical electrical specifications, receiver hysteresis (70 mV), data rate (2.5 Mbps), supply voltage (4.75V ~ 5.25V), operating temperature (0°C ~ 70°C), and 8-SOIC packaging. Both are active products with RoHS3 compliance.

Q: What is the difference between the Analog Devices MAX series substitutes? A: MAX1487ECSA+, MAX481ECSA+, and MAX485ECSA+ all maintain identical electrical and mechanical specifications to the original MAX485ECSA. The primary difference is the base product number designation. All three are suitable direct replacements with active product status.

Q: Can I use ST485ERBDR as a replacement? A: Yes. ST485ERBDR maintains the same electrical specifications (2.5 Mbps, 70 mV hysteresis, 4.75V ~ 5.25V supply) and 8-SOIC package as MAX485ECSA. It offers extended operating temperature (-40°C ~ 85°C) compared to the original 0°C ~ 70°C range, making it suitable for wider temperature applications.

Q: What advantage does ADM1485ARZ provide over direct equivalents? A: ADM1485ARZ offers 30 Mbps data rate compared to 2.5 Mbps in the original MAX485ECSA, with extended operating temperature (-40°C ~ 85°C). It maintains the same 8-SOIC package and supply voltage specifications. This upgrade is appropriate for designs requiring higher communication speeds.

Q: Are all substitute parts RoHS3 compliant? A: All active product substitutes listed (MAX1487ECSA+, MAX481ECSA+, MAX485ECSA+, ST485ECDR, ST485ERBDR, ADM1485ARZ, ADM1485ARZ-REEL) are RoHS3 compliant. The original MAX485ECSA is RoHS non-compliant due to its obsolete status.

Q: Does package type affect substitution compatibility? A: Yes. All recommended substitutes use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, matching the original MAX485ECSA. SN65HVD485EDGK uses 8-VSSOP packaging and is not recommended as a direct replacement due to different footprint requirements.

Q: Can I substitute based on data rate alone? A: No. Substitution requires matching multiple parameters: RS422/RS485 protocol, 1/1 driver/receiver configuration, half-duplex operation, 70 mV receiver hysteresis, 8-SOIC package, and compatible supply voltage. Higher data rate parts (ST485ECDR at 5 Mbps, ADM1485ARZ at 30 Mbps) are functional upgrades but require system-level compatibility assessment.

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