MAX489ECPD RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX489ECPD is a full-duplex RS422/RS485 transceiver integrated circuit in 14-DIP packaging, manufactured by Analog Devices Inc./Maxim Integrated. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functionality. The MAX489ECPD operates as a 1/1 transceiver with 250 kbps data rate capability and is designed for industrial communication applications requiring robust serial interface standards.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX489ECPD
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	250 kbps
Receiver Hysteresis	70 mV
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MAX489ECPD is determined by strict parameter matching across the following critical criteria:

Core Compatibility Parameters:

Protocol: RS422/RS485 full-duplex operation
Number of Drivers/Receivers: 1/1 configuration
Package / Case: 14-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Voltage - Supply: 4.75V ~ 5.25V range
Operating Temperature: 0°C ~ 70°C range

Secondary Compatibility Parameters:

Data Rate: 250 kbps
Receiver Hysteresis: 70 mV (where specified)

All substitute parts listed maintain identical electrical and mechanical specifications within these parameters. Variations in product status, RoHS compliance, and packaging format (tube vs. other) do not affect functional interchangeability in circuit applications.

Parameter Comparison

Parameter	MAX489ECPD	MAX489CPD+	MAX489ECPD+	LT1791CN#PBF	LTC491CN#PBF
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc.	Analog Devices Inc.
Protocol	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485
Number of Drivers/Receivers	1/1	1/1	1/1	1/1	1/1
Duplex	Full	Full	Full	Full	Full
Data Rate	250 kbps	250 kbps	250 kbps	250 kbps	—
Receiver Hysteresis	70 mV	70 mV	70 mV	20 mV	70 mV
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalents (Identical Specifications):

MAX489CPD+ and MAX489ECPD+ are direct parametric equivalents to the MAX489ECPD. Both parts maintain all electrical and mechanical specifications while offering active product status and ROHS3 compliance. These parts are recommended as primary substitutes for new designs and system replacements where RoHS compliance is required.

Manufacturer Recommended Alternatives:

LT1791CN#PBF and LTC491CN#PBF are manufacturer-recommended alternatives from Analog Devices Inc. Both maintain full protocol compatibility, package form factor, and supply voltage specifications. LT1791CN#PBF features reduced receiver hysteresis (20 mV vs. 70 mV), which may provide improved noise immunity in certain applications. LTC491CN#PBF maintains the 70 mV hysteresis specification. Both alternatives are ROHS3 compliant and carry active product status.

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and carry REACH Unaffected status, meeting modern regulatory requirements. The original MAX489ECPD is RoHS non-compliant, making substitution necessary for applications subject to RoHS directives.

Frequently Asked Questions (FAQ)

Q: Can MAX489CPD+ directly replace MAX489ECPD in existing designs?

A: Yes. MAX489CPD+ maintains identical electrical specifications, package form factor, and pin configuration. No circuit modifications are required for direct substitution in through-hole applications.

Q: What is the difference between MAX489ECPD+ and MAX489CPD+?

A: Both parts are parametric equivalents with identical specifications. The primary difference is packaging format and inventory availability. Both are suitable for direct substitution.

Q: How does LT1791CN#PBF differ from the MAX489ECPD?

A: LT1791CN#PBF maintains all core specifications including RS422/RS485 protocol, 1/1 transceiver configuration, full-duplex operation, and 14-DIP package. The receiver hysteresis is specified at 20 mV compared to 70 mV in the MAX489ECPD. This lower hysteresis may provide improved sensitivity to smaller signal transitions.

Q: Is LTC491CN#PBF a suitable replacement?

A: Yes. LTC491CN#PBF maintains identical receiver hysteresis (70 mV), protocol support, transceiver configuration, package form factor, and supply voltage specifications. Data rate specification is not provided for this part but does not affect functional compatibility in RS422/RS485 applications.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts are supplied in 14-DIP (0.300", 7.62mm) through-hole packages, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts are ROHS3 compliant and REACH Unaffected. The original MAX489ECPD is RoHS non-compliant, making substitution necessary for applications subject to RoHS directives.

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