MAX489EESD Equivalent & Substitute Parts

Part Overview

The MAX489EESD is a 1/1 full-duplex RS422/RS485 transceiver IC in 14-SOIC surface mount packaging manufactured by Analog Devices Inc./Maxim Integrated. This part is classified as obsolete and has been superseded by active alternatives. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and comply with current RoHS and regulatory requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX489EESD
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	70 mV
Data Rate	250 kbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

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

Core Substitution Criteria:

Protocol: RS422, RS485
Number of Drivers/Receivers: 1/1
Duplex: Full
Data Rate: 250 kbps
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature: -40°C ~ 85°C

Acceptable Parameter Variations:

Receiver Hysteresis: 70 mV (primary) or 20 mV (acceptable for signal integrity)
Voltage - Supply: 4.75V ~ 5.25V (primary) or 4.5V ~ 5.5V (acceptable for broader supply range)
RoHS Status: Non-compliant (original) to ROHS3 Compliant (substitutes)
Moisture Sensitivity Level: 1 (Unlimited) or 3 (168 Hours)
Packaging Format: Tube, Tape & Reel (TR), or Cut Tape (CT) & Digi-Reel®

Substitutes are grouped into two categories: parametric equivalents (identical electrical specifications with updated compliance) and manufacturer-recommended alternatives (functionally equivalent with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
MAX489EESD	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	70 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Obsolete	RoHS non-compliant
MAX489EESD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	70 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
MAX489ESD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	70 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
ADM489ARZ-REEL	Analog Devices Inc.	RS422, RS485	1/1	70 mV	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Not For New Designs	ROHS3 Compliant
ADM489ARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	70 mV	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
ISL4489EIBZ	Renesas Electronics Corporation	RS422, RS485	1/1	70 mV	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
ISL4489EIBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	70 mV	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
ISL8489EIBZ	Renesas Electronics Corporation	RS422, RS485	1/1	70 mV	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
ISL8489EIBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	70 mV	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
LT1791IS#PBF	Analog Devices Inc.	RS422, RS485	1/1	20 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
LT1791IS#TRPBF	Analog Devices Inc.	RS422, RS485	1/1	20 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Identical Electrical Specifications):

MAX489EESD+ and MAX489ESD+ are direct parametric equivalents to the obsolete MAX489EESD. Both maintain identical receiver hysteresis (70 mV), supply voltage range (4.75V ~ 5.25V), and data rate specifications. Both are active products with ROHS3 compliance, making them the preferred choice for new designs and existing inventory replacement.

Manufacturer-Recommended Alternatives (Active Status):

ADM489ARZ-REEL7, ISL4489EIBZ, ISL4489EIBZ-T, ISL8489EIBZ, and ISL8489EIBZ-T are all active products with ROHS3 compliance. These parts accept a broader supply voltage range (4.5V ~ 5.5V) compared to the original specification. All maintain the required 1/1 driver/receiver configuration, full-duplex operation, 250 kbps data rate, and 14-SOIC packaging. ISL variants are manufactured by Renesas Electronics Corporation; ADM variants are manufactured by Analog Devices Inc.

Alternative with Modified Receiver Hysteresis:

LT1791IS#PBF and LT1791IS#TRPBF feature reduced receiver hysteresis (20 mV versus 70 mV). This parameter difference affects noise immunity and signal detection thresholds. These parts are suitable only when the lower hysteresis specification is compatible with the application's signal integrity requirements.

Parts to Avoid for New Designs:

ADM489ARZ-REEL carries a "Not For New Designs" status and should not be selected for new applications despite ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can MAX489EESD be directly replaced with MAX489EESD+?

A: Yes. MAX489EESD+ is a parametric equivalent with identical electrical specifications. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant). Pin configuration, package, and functional performance are identical.

Q: What is the difference between ADM489ARZ-REEL and ADM489ARZ-REEL7?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is product status: ADM489ARZ-REEL is marked "Not For New Designs," while ADM489ARZ-REEL7 is active. For new designs, ADM489ARZ-REEL7 is the appropriate selection.

Q: Are ISL4489EIBZ and ISL8489EIBZ interchangeable?

A: Both parts meet the core substitution criteria with identical receiver hysteresis (70 mV), data rate (250 kbps), and 14-SOIC packaging. The primary difference is manufacturer designation within the Renesas product line. Both are active with ROHS3 compliance. Interchangeability depends on application-specific requirements and design validation.

Q: Why do LT1791IS#PBF and LT1791IS#TRPBF have different receiver hysteresis?

A: Receiver hysteresis is a specified electrical parameter that affects the threshold voltage differential for signal detection. The LT1791 series specifies 20 mV hysteresis compared to 70 mV in the MAX489 and ADM489 series. This difference impacts noise immunity and may require circuit-level evaluation before substitution.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube (standard packaging), Tape & Reel (TR) for automated assembly, and Cut Tape (CT) & Digi-Reel® for mixed-volume applications. All maintain the same 14-SOIC physical form factor and pin configuration.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance status. The original MAX489EESD is RoHS non-compliant. Compliance status is a key differentiator for applications subject to RoHS regulations.

Q: Can the supply voltage range difference (4.75V ~ 5.25V versus 4.5V ~ 5.5V) affect circuit operation?

A: The broader supply voltage range in ADM489 and ISL variants (4.5V ~ 5.5V) provides greater tolerance for supply fluctuations. If the application operates within the original specification range (4.75V ~ 5.25V), both ranges are functionally compatible. Applications requiring operation at the extended voltage extremes should select parts with the broader range.

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