MAX490CPA RS422/RS485 Transceiver - Equivalent & Substitute Parts

Part Overview

The MAX490CPA is a full-duplex RS422/RS485 transceiver IC manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-pin DIP package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs or ongoing production requirements. The MAX490CPA operates at 2.5 Mbps data rate with a 70 mV receiver hysteresis, making it suitable for industrial communication applications requiring robust differential signaling over extended distances.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX490CPA
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	2.5 Mbps
Receiver Hysteresis	70 mV
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MAX490CPA is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Protocol compatibility: RS422 and RS485 support required
Duplex mode: Full-duplex operation mandatory
Number of drivers/receivers: 1/1 configuration required
Package type: 8-DIP (0.300", 7.62mm) form factor required
Supply voltage range: 4.75V ~ 5.25V compatibility required
Receiver hysteresis: 70 mV (where specified)
Mounting type: Through Hole required

Substitute Categories:

Parametric Equivalents (Identical Electrical Specifications):

MAX490CPA+ and MAX490ECPA+ are direct parametric equivalents manufactured by Analog Devices Inc./Maxim Integrated with identical electrical characteristics and active product status.

Manufacturer Recommended Substitutes (Functional Equivalents with Parameter Variations):

LTC490CN8#PBF and LTC490IN8#PBF (Analog Devices Inc.) provide functional equivalence with identical supply voltage and package specifications. LTC490IN8#PBF extends operating temperature range to -40°C ~ 85°C.
SN65LBC179P and SN75LBC179P (Texas Instruments) provide functional equivalence with identical package and supply voltage specifications. Both are obsolete products. SN65LBC179P supports extended temperature range (-40°C ~ 85°C) with 45 mV receiver hysteresis. SN75LBC179P operates at standard temperature range (0°C ~ 70°C) with 45 mV receiver hysteresis.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Supply Voltage	Operating Temperature	Receiver Hysteresis	Package	Product Status	RoHS Status
MAX490CPA	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	8-DIP (0.300", 7.62mm)	Obsolete	RoHS non-compliant
MAX490CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	8-DIP (0.300", 7.62mm)	Active	ROHS3 Compliant
MAX490ECPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	8-DIP (0.300", 7.62mm)	Active	ROHS3 Compliant
LTC490CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	8-DIP (0.300", 7.62mm)	Active	ROHS3 Compliant
LTC490IN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	8-DIP (0.300", 7.62mm)	Active	ROHS3 Compliant
SN65LBC179P	Texas Instruments	RS422, RS485	1/1	Full	4.75V ~ 5.25V	-40°C ~ 85°C	45 mV	8-DIP (0.300", 7.62mm)	Obsolete	ROHS3 Compliant
SN75LBC179P	Texas Instruments	RS422, RS485	1/1	Full	4.75V ~ 5.25V	0°C ~ 70°C	45 mV	8-DIP (0.300", 7.62mm)	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

For New Designs with RoHS Compliance Requirements: MAX490CPA+ or MAX490ECPA+ are the preferred selections. Both are active products manufactured by Analog Devices Inc./Maxim Integrated with ROHS3 compliance certification and identical electrical specifications to the original MAX490CPA. These parts maintain the 70 mV receiver hysteresis and 0°C ~ 70°C operating temperature range.

For Extended Temperature Range Applications: LTC490IN8#PBF provides an active alternative with extended operating temperature range (-40°C ~ 85°C) while maintaining identical supply voltage, package configuration, and receiver hysteresis specifications. This part is ROHS3 compliant.

For Standard Temperature Range with Alternative Manufacturer: LTC490CN8#PBF is an active Analog Devices Inc. product suitable for standard temperature applications (0°C ~ 70°C) with identical electrical and package specifications.

For Existing Inventory or Legacy System Maintenance: SN75LBC179P matches the original operating temperature range (0°C ~ 70°C) and package configuration, though it is obsolete. SN65LBC179P offers extended temperature capability (-40°C ~ 85°C) but is also obsolete. Both Texas Instruments parts feature 45 mV receiver hysteresis, which differs from the 70 mV specification of the MAX490CPA.

Frequently Asked Questions (FAQ)

Q: Can MAX490CPA+ be used as a direct replacement for MAX490CPA? A: Yes. MAX490CPA+ is a parametric equivalent with identical electrical specifications, package configuration, and operating parameters. The primary difference is active product status and ROHS3 compliance certification.

Q: What is the difference between MAX490CPA+ and MAX490ECPA+? A: Both are parametric equivalents with identical electrical specifications and operating parameters. The difference lies in manufacturing date codes and packaging tube specifications. Both are active products with ROHS3 compliance.

Q: Can LTC490IN8#PBF replace MAX490CPA in all applications? A: LTC490IN8#PBF is functionally equivalent for RS422/RS485 communication with identical supply voltage and package specifications. The extended operating temperature range (-40°C ~ 85°C) makes it suitable for applications requiring wider temperature operation. Verify application temperature requirements before substitution.

Q: Why do SN65LBC179P and SN75LBC179P have different receiver hysteresis values? A: The Texas Instruments SN65LBC179P and SN75LBC179P parts specify 45 mV receiver hysteresis compared to the 70 mV of the MAX490CPA. This parameter difference may affect noise immunity in specific applications. Evaluate system noise margins before substitution.

Q: Are all substitute parts available in the same 8-DIP package? A: Yes. All listed substitute parts use the 8-DIP (0.300", 7.62mm) through-hole package configuration, ensuring mechanical compatibility with existing PCB layouts.

Q: Which substitute parts have active product status? A: MAX490CPA+, MAX490ECPA+, LTC490CN8#PBF, and LTC490IN8#PBF are active products. SN65LBC179P and SN75LBC179P are obsolete.

Q: What is the significance of ROHS3 compliance for new designs? A: ROHS3 compliance indicates conformance to current environmental and hazardous substance restrictions. For new production designs, ROHS3-compliant parts (MAX490CPA+, MAX490ECPA+, LTC490CN8#PBF, LTC490IN8#PBF) are recommended to ensure regulatory compliance and long-term supply chain viability.

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