MAX490CSA RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX490CSA is a 1/1 full-duplex RS422/RS485 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface mount package. This part is classified as obsolete, with 15,689 units currently in stock. Due to its obsolete status, identifying functionally equivalent active alternatives is essential for new designs and long-term supply chain planning. Substitute parts must maintain compatibility across electrical specifications, mechanical packaging, and protocol support to ensure direct replacement capability.

Key Parameters

Parameter	MAX490CSA
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)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MAX490CSA is determined by the following critical parameters:

Protocol support: RS422 and RS485 full-duplex operation
Electrical configuration: 1/1 driver/receiver topology
Receiver hysteresis: 70 mV specification
Supply voltage range: Minimum 4.75V to 5.25V nominal operation
Package type: 8-SOIC surface mount form factor
Operating temperature range: 0°C to 70°C minimum

Substitute parts are grouped into two categories:

Parametric Equivalents maintain identical electrical and mechanical specifications with improved product status (Active) and RoHS3 compliance. These parts are direct replacements with no design modifications required.

Manufacturer Recommended Alternatives provide functional equivalence with variations in secondary parameters such as data rate capability, supply voltage tolerance, or operating temperature range. These parts require design verification to confirm compatibility with specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
MAX490CSA	Analog Devices/Maxim	RS422, RS485	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Obsolete	Non-compliant
MAX490CSA+	Analog Devices/Maxim	RS422, RS485	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
MAX490ECSA+	Analog Devices/Maxim	RS422, RS485	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
DS8921M/NOPB	Texas Instruments	RS422, RS485	1/1	70 mV	—	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
ISL8490EIBZ	Renesas Electronics	RS422, RS485	1/1	70 mV	10 Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ISL8490EIBZ-T	Renesas Electronics	RS422, RS485	1/1	70 mV	10 Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ISL8490IBZ	Renesas Electronics	RS422, RS485	1/1	70 mV	5 Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ISL8490IBZ-T	Renesas Electronics	RS422, RS485	1/1	70 mV	5 Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LTC2863CS8-1#PBF	Analog Devices	RS422, RS485	1/1	150 mV	20 Mbps	3V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
LTC2863CS8-1#TRPBF	Analog Devices	RS422, RS485	1/1	150 mV	20 Mbps	3V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
LTC2863CS8-2#PBF	Analog Devices	RS422, RS485	1/1	150 mV	250 kbps	3V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents):

MAX490CSA+ and MAX490ECSA+ are parametric equivalents manufactured by Analog Devices/Maxim Integrated. Both parts maintain identical electrical specifications and 8-SOIC packaging. These parts are currently in active production status with ROHS3 compliance, making them the preferred choice for new designs and obsolescence mitigation. No circuit modifications are required for substitution.

Alternative Selections (Manufacturer Recommended):

DS8921M/NOPB (Texas Instruments) provides functional equivalence with slightly expanded supply voltage tolerance (4.5V ~ 5.5V versus 4.75V ~ 5.25V). This part is suitable for applications where the broader voltage range provides design margin.

ISL8490 series (Renesas Electronics) offers enhanced performance with higher data rate capability (5 Mbps to 10 Mbps) and extended operating temperature range (-40°C ~ 85°C). ISL8490EIBZ and ISL8490EIBZ-T variants are available in tube and tape & reel packaging. These parts are appropriate for applications requiring improved thermal performance or higher-speed communication.

LTC2863CS8 series (Analog Devices) provides the highest data rate capability (20 Mbps) with expanded supply voltage range (3V ~ 5.5V). However, receiver hysteresis is specified at 150 mV, which differs from the MAX490CSA specification of 70 mV. This parameter variation requires application-level verification. LTC2863CS8-1#PBF and LTC2863CS8-1#TRPBF are optimized for high-speed applications, while LTC2863CS8-2#PBF is specified for low-speed operation (250 kbps).

All recommended alternatives are ROHS3 compliant and in active production status, supporting long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can MAX490CSA be directly replaced with MAX490CSA+ or MAX490ECSA+?

A: Yes. MAX490CSA+, MAX490ECSA+, and the original MAX490CSA share identical electrical specifications, receiver hysteresis, data rate, supply voltage range, and operating temperature range. The primary differences are product status (Active versus Obsolete) and RoHS compliance. No design modifications are required.

Q: What is the difference between ISL8490EIBZ and ISL8490IBZ?

A: Both parts are manufactured by Renesas Electronics with identical electrical specifications and packaging. The primary difference is data rate: ISL8490EIBZ supports 10 Mbps, while ISL8490IBZ supports 5 Mbps. Both are available in tube (EIBZ, IBZ) and tape & reel (EIBZ-T, IBZ-T) packaging options. Selection depends on application bandwidth requirements.

Q: Why does LTC2863CS8 have different receiver hysteresis (150 mV) than MAX490CSA (70 mV)?

A: Receiver hysteresis is a design parameter that affects noise immunity and switching threshold behavior. The LTC2863CS8 series specifies 150 mV hysteresis, which differs from the MAX490CSA specification of 70 mV. Applications sensitive to hysteresis characteristics must verify compatibility before substitution.

Q: Are all substitute parts available in 8-SOIC packaging?

A: Yes. All listed substitute parts are housed in 8-SOIC (0.154", 3.90mm Width) surface mount packages, ensuring mechanical compatibility with existing PCB layouts. Packaging variants (tube versus tape & reel) are available for certain part numbers to accommodate different procurement and assembly workflows.

Q: What is the supply voltage compatibility range for substitutes?

A: The MAX490CSA operates at 4.75V ~ 5.25V. Substitute parts offer varying ranges: DS8921M/NOPB and ISL8490 series support 4.5V ~ 5.5V, while LTC2863CS8 series supports 3V ~ 5.5V. All ranges encompass the original specification, ensuring compatibility with standard 5V supply systems.

Q: Which substitute part is recommended for extended temperature applications?

A: ISL8490 series (EIBZ, EIBZ-T, IBZ, IBZ-T) supports operating temperature range of -40°C ~ 85°C, compared to 0°C ~ 70°C for MAX490CSA and other alternatives. This extended range is suitable for industrial and automotive applications requiring broader thermal performance.

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