MAX489CPD RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX489CPD is a full-duplex RS422/RS485 transceiver interface IC manufactured by Analog Devices Inc./Maxim Integrated. This component operates as a 1/1 driver/receiver configuration in a 14-pin DIP package, designed for industrial communication applications requiring robust serial data transmission over twisted-pair cabling.

The MAX489CPD is classified as obsolete. Locating active production alternatives is necessary for new designs, system upgrades, and long-term supply chain continuity. Equivalent and substitute parts maintain the same electrical and mechanical specifications while offering improved availability and compliance status.

Key Parameters

Parameter	Specification
Protocol Support	RS422, RS485
Driver/Receiver Configuration	1/1 (Full Duplex)
Receiver Hysteresis	70 mV
Data Rate	250 kbps
Supply Voltage	4.75V to 5.25V
Operating Temperature	0°C to 70°C
Package Type	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict parameter matching across electrical and mechanical specifications. The following criteria define valid substitutes for the MAX489CPD:

Primary Substitution Criteria:

Protocol: RS422/RS485 full-duplex operation
Driver/Receiver count: 1/1 configuration
Package: 14-DIP (0.300", 7.62mm)
Supply voltage range: 4.75V to 5.25V
Data rate: 250 kbps minimum
Mounting type: Through Hole
Moisture sensitivity: MSL 1

Substitution Categories:

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

Manufacturer-Recommended Substitutes are approved alternatives that meet core functional requirements. Variations in receiver hysteresis (20 mV vs. 70 mV) and operating temperature ranges are noted but do not prevent substitution in applications where these parameters are not critical design constraints.

Parameter Comparison

Part Number	Manufacturer	Product Status	Receiver Hysteresis (mV)	Operating Temperature (°C)	RoHS Status	Packaging	Inventory (Pcs)
MAX489CPD	Analog Devices Inc./Maxim Integrated	Obsolete	70	0 to 70	RoHS Non-Compliant	Tube	3,300
MAX489CPD+	Analog Devices Inc./Maxim Integrated	Active	70	0 to 70	ROHS3 Compliant	Tube	7,937
MAX489ECPD+	Analog Devices Inc./Maxim Integrated	Active	70	0 to 70	ROHS3 Compliant	Tube	1,900
LT1791ACN#PBF	Analog Devices Inc.	Active	20	0 to 70	ROHS3 Compliant	Tube	1,067
LT1791CN#PBF	Analog Devices Inc.	Active	20	0 to 70	ROHS3 Compliant	Tube	2,840
LT1791HN#PBF	Analog Devices Inc.	Active	20	-40 to 125	ROHS3 Compliant	Tube	760
LTC491CN#PBF	Analog Devices Inc.	Active	70	0 to 70	ROHS3 Compliant	Tube	2,200

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

MAX489CPD+ and MAX489ECPD+ are parametric equivalents offering identical electrical performance to the MAX489CPD. Both parts are in active production status with ROHS3 compliance. MAX489CPD+ provides the highest inventory availability (7,937 units) and is the preferred choice for immediate procurement.

For Extended Temperature Range Applications:

LT1791HN#PBF extends the operating temperature range to -40°C to 125°C, accommodating industrial and automotive environments requiring wider thermal performance. This part maintains all other electrical specifications and is ROHS3 compliant.

For Hysteresis-Sensitive Applications:

LT1791ACN#PBF, LT1791CN#PBF, and LT1791HN#PBF feature reduced receiver hysteresis (20 mV vs. 70 mV), improving noise immunity in applications with marginal signal levels. These parts are manufacturer-recommended alternatives with active production status.

For Matching Original Hysteresis Specification:

LTC491CN#PBF maintains the 70 mV receiver hysteresis specification identical to the MAX489CPD, ensuring compatibility with designs optimized for this parameter. This part is ROHS3 compliant and in active production.

All substitute parts maintain the 14-DIP package, through-hole mounting, 4.75V to 5.25V supply voltage range, 250 kbps data rate, and MSL 1 moisture sensitivity level of the original MAX489CPD.

Frequently Asked Questions (FAQ)

Q: Can MAX489CPD+ be used as a direct replacement for MAX489CPD?

A: Yes. MAX489CPD+ is a parametric equivalent with identical electrical specifications (70 mV hysteresis, 0°C to 70°C operating range, 250 kbps data rate) and mechanical compatibility (14-DIP package, through-hole mounting). The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between MAX489 and LT1791 series parts?

A: Both series are RS422/RS485 full-duplex transceivers in 14-DIP packages with identical supply voltage and data rate specifications. The LT1791 series features reduced receiver hysteresis (20 mV vs. 70 mV) and extended temperature range options, making them suitable for noise-sensitive or wide-temperature applications.

Q: Does receiver hysteresis affect circuit functionality?

A: Receiver hysteresis determines the voltage differential required to switch the receiver output state. Lower hysteresis (20 mV) provides improved noise immunity in marginal signal conditions. Higher hysteresis (70 mV) is suitable for applications with robust signal levels. Selection depends on application-specific noise environment and signal integrity requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed (MAX489CPD+, MAX489ECPD+, LT1791ACN#PBF, LT1791CN#PBF, LT1791HN#PBF, LTC491CN#PBF) are ROHS3 compliant. The original MAX489CPD is RoHS non-compliant.

Q: Can LT1791HN#PBF be used in applications requiring only 0°C to 70°C operation?

A: Yes. LT1791HN#PBF operates within the 0°C to 70°C range and is fully compatible with designs specifying this temperature window. The extended -40°C to 125°C capability provides additional operational margin without compromising performance in standard temperature applications.

Q: Are all parts available in the same packaging format?

A: Yes. All substitute parts are supplied in 14-DIP (0.300", 7.62mm) through-hole packages with MSL 1 moisture sensitivity level, ensuring mechanical and environmental compatibility with the original MAX489CPD.

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