MAX487CSA RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The MAX487CSA is a half-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 2,080 units currently in stock. The MAX487CSA operates at 250 kbps data rate with a 70 mV receiver hysteresis and supports supply voltages from 4.75V to 5.25V across an operating temperature range of 0°C to 70°C.

Due to its obsolete product status, identifying equivalent and substitute parts is essential for design continuity, long-term availability, and compliance with current manufacturing standards. Active alternatives from Analog Devices provide enhanced performance specifications, improved temperature ranges, and full RoHS3 compliance.

Key Parameters

Parameter	MAX487CSA
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver Half-Duplex
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Data Rate	250 kbps
Receiver Hysteresis	70 mV
Supply Voltage	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
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX487CSA is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Protocol: RS422/RS485 half-duplex operation
Driver/Receiver Configuration: 1/1 topology
Package: 8-SOIC form factor with identical pinout
Supply Voltage Range: 4.75V ~ 5.25V compatibility
Receiver Hysteresis: 70 mV specification
Mounting Type: Surface mount compatibility

Substitute Categories:

Parametric Equivalents (MAX483/MAX487 Series): MAX483CSA+, MAX483ECSA+, MAX487CSA+, and MAX487ECSA+ maintain identical electrical specifications and package footprint. These parts are active products with RoHS3 compliance and represent direct functional replacements with improved product lifecycle status.

Manufacturer Recommended Alternatives (ADM1485/ADM1486 Series): ADM1485ARZ, ADM1485ARZ-REEL, ADM1485ARZ-REEL7, ADM1485JRZ, ADM1485JRZ-REEL, and ADM1486ARZ provide enhanced performance with 30 Mbps data rate capability while maintaining the same 1/1 driver/receiver configuration, 70 mV hysteresis, and 8-SOIC package. These parts support extended temperature ranges (-40°C to 85°C for industrial grades) and offer superior availability with RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Receiver Hysteresis	Supply Voltage	Operating Temperature	Package	Product Status	RoHS Status	Inventory
MAX487CSA	Analog Devices/Maxim	RS422, RS485	1/1	250 kbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Obsolete	Non-compliant	2,080
MAX483CSA+	Analog Devices/Maxim	RS422, RS485	1/1	250 kbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant	4,400
MAX483ECSA+	Analog Devices/Maxim	RS422, RS485	1/1	250 kbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant	2,000
MAX487CSA+	Analog Devices/Maxim	RS422, RS485	1/1	250 kbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant	1,220
MAX487ECSA+	Analog Devices/Maxim	RS422, RS485	1/1	250 kbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant	3,200
ADM1485ARZ	Analog Devices	RS422, RS485	1/1	30 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant	19,566
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	30,400
ADM1485ARZ-REEL7	Analog Devices	RS422, RS485	1/1	30 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant	15,100
ADM1485JRZ	Analog Devices	RS422, RS485	1/1	30 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant	16,500
ADM1485JRZ-REEL	Analog Devices	RS422, RS485	1/1	30 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant	19,479
ADM1486ARZ	Analog Devices	RS422, RS485	1/1	30 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant	9,798

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select MAX483CSA+, MAX483ECSA+, MAX487CSA+, or MAX487ECSA+ when exact electrical and thermal specifications of the obsolete MAX487CSA must be maintained. These parts provide identical 250 kbps data rate and 0°C to 70°C operating range. All are active products with RoHS3 compliance and superior long-term availability. MAX483CSA+ offers the highest inventory level at 4,400 units.

For Enhanced Performance Applications: The ADM1485 and ADM1486 series provide 30 Mbps data rate capability—120 times faster than the original MAX487CSA—while maintaining identical 1/1 driver/receiver configuration, 70 mV hysteresis, and 8-SOIC package footprint. These parts are fully backward compatible at the pinout level.

Temperature Range Selection:

Industrial applications requiring -40°C to 85°C operation: ADM1485ARZ, ADM1485ARZ-REEL, ADM1485ARZ-REEL7, or ADM1486ARZ
Commercial applications with 0°C to 70°C requirement: ADM1485JRZ or ADM1485JRZ-REEL

Packaging and Supply Chain Considerations:

Tube packaging: MAX483CSA+, MAX483ECSA+, MAX487CSA+, MAX487ECSA+, ADM1485ARZ, ADM1485JRZ, ADM1486ARZ
Cut Tape & Digi-Reel packaging: ADM1485ARZ-REEL, ADM1485ARZ-REEL7, ADM1485JRZ-REEL

All substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, eliminating compliance risks associated with the non-compliant MAX487CSA.

Frequently Asked Questions (FAQ)

Q: Can MAX483CSA+ be used as a direct drop-in replacement for MAX487CSA?

A: Yes. MAX483CSA+ maintains identical electrical specifications including 250 kbps data rate, 70 mV receiver hysteresis, 4.75V to 5.25V supply voltage, and 0°C to 70°C operating temperature. The 8-SOIC package and pinout are identical, enabling direct PCB substitution. The primary advantage is active product status and RoHS3 compliance.

Q: What is the key difference between MAX487CSA and ADM1485ARZ?

A: The ADM1485ARZ operates at 30 Mbps data rate compared to 250 kbps for MAX487CSA. Both maintain identical 1/1 driver/receiver configuration, 70 mV hysteresis, and 8-SOIC package. The ADM1485ARZ supports extended temperature range (-40°C to 85°C) and offers significantly higher inventory availability. Electrical compatibility is maintained at the pinout level.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts—MAX483CSA+, MAX483ECSA+, MAX487CSA+, MAX487ECSA+, ADM1485ARZ variants, and ADM1486ARZ—carry RoHS3 compliance certification. The original MAX487CSA is RoHS non-compliant, making substitution necessary for new designs and compliance-regulated applications.

Q: What packaging options are available for high-volume procurement?

A: Cut Tape & Digi-Reel packaging is available for ADM1485ARZ-REEL (30,400 units), ADM1485ARZ-REEL7 (15,100 units), and ADM1485JRZ-REEL (19,479 units). Tube packaging is available for all other variants. Digi-Reel options provide the highest inventory levels for supply chain continuity.

Q: Can ADM1485JRZ replace MAX487CSA in temperature-sensitive applications?

A: ADM1485JRZ maintains the same 0°C to 70°C operating temperature range as MAX487CSA, making it suitable for identical thermal environments. However, it provides 30 Mbps data rate capability. For applications requiring extended temperature operation, ADM1485ARZ (-40°C to 85°C) or ADM1486ARZ (-40°C to 85°C) are recommended.

Q: Is the 8-SOIC package footprint identical across all substitute parts?

A: Yes. All substitute parts use the 8-SOIC (0.154", 3

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