MAX489ECSD Equivalent & Substitute Parts

Part Overview

The MAX489ECSD is a 1/1 full-duplex RS422/RS485 transceiver IC manufactured by Analog Devices Inc./Maxim Integrated in a 14-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for new designs and ongoing production support. The MAX489ECSD operates within a 4.75V to 5.25V supply range with a 250 kbps data rate and 70 mV receiver hysteresis, designed for industrial communication applications requiring reliable serial interface functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX489ECSD
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Data Rate	250 kbps
Voltage - Supply	4.75V ~ 5.25V
Receiver Hysteresis	70 mV
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MAX489ECSD is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Protocol compatibility: RS422/RS485 full-duplex operation
Driver/Receiver configuration: 1/1 topology
Data rate: 250 kbps minimum
Package type: 14-SOIC form factor
Receiver hysteresis: 70 mV
Mounting type: Surface mount

Secondary Considerations:

Supply voltage range (4.75V–5.25V for direct replacement; 4.5V–5.5V for extended-range alternatives)
Operating temperature range (0°C–70°C for direct replacement; -40°C–85°C for industrial-grade alternatives)
RoHS compliance status and moisture sensitivity level

Substitute parts are grouped into three categories: parametric equivalents (identical electrical specifications with different packaging or product status), manufacturer-recommended alternatives (functionally equivalent with extended operating ranges), and cross-manufacturer options (equivalent functionality from alternative suppliers).

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Receiver Hysteresis	Operating Temp	Package	Product Status	RoHS Status
MAX489ECSD	Analog Devices/Maxim	RS422, RS485	1/1	250 kbps	4.75V–5.25V	70 mV	0°C–70°C	14-SOIC	Obsolete	Non-compliant
MAX489CSD+	Analog Devices/Maxim	RS422, RS485	1/1	250 kbps	4.75V–5.25V	70 mV	0°C–70°C	14-SOIC	Active	ROHS3 Compliant
MAX489ECSD+	Analog Devices/Maxim	RS422, RS485	1/1	250 kbps	4.75V–5.25V	70 mV	0°C–70°C	14-SOIC	Active	ROHS3 Compliant
ADM489ARZ-REEL	Analog Devices	RS422, RS485	1/1	250 kbps	4.5V–5.5V	70 mV	-40°C–85°C	14-SOIC	Not For New Designs	ROHS3 Compliant
ADM489ARZ-REEL7	Analog Devices	RS422, RS485	1/1	250 kbps	4.5V–5.5V	70 mV	-40°C–85°C	14-SOIC	Active	ROHS3 Compliant
ISL4489EIBZ	Renesas Electronics	RS422, RS485	1/1	250 kbps	4.5V–5.5V	70 mV	-40°C–85°C	14-SOIC	Active	ROHS3 Compliant
ISL4489EIBZ-T	Renesas Electronics	RS422, RS485	1/1	250 kbps	4.5V–5.5V	70 mV	-40°C–85°C	14-SOIC	Active	ROHS3 Compliant
ISL8489EIBZ	Renesas Electronics	RS422, RS485	1/1	250 kbps	4.5V–5.5V	70 mV	-40°C–85°C	14-SOIC	Active	ROHS3 Compliant
ISL8489EIBZ-T	Renesas Electronics	RS422, RS485	1/1	250 kbps	4.5V–5.5V	70 mV	-40°C–85°C	14-SOIC	Active	ROHS3 Compliant
LT1791CS#PBF	Analog Devices	RS422, RS485	1/1	250 kbps	4.75V–5.25V	20 mV	0°C–70°C	14-SOIC	Active	ROHS3 Compliant
LT1791CS#TRPBF	Analog Devices	RS422, RS485	1/1	250 kbps	4.75V–5.25V	20 mV	0°C–70°C	14-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended for Replacement):

MAX489CSD+ and MAX489ECSD+ are direct parametric equivalents of the MAX489ECSD, maintaining identical electrical specifications including 4.75V–5.25V supply voltage, 0°C–70°C operating temperature, and 70 mV receiver hysteresis. Both parts are in active product status with ROHS3 compliance, making them suitable for new designs and production transitions from the obsolete MAX489ECSD.

Extended-Range Industrial Alternatives:

ADM489ARZ-REEL7, ISL4489EIBZ, ISL4489EIBZ-T, ISL8489EIBZ, and ISL8489EIBZ-T offer expanded operating temperature ranges (-40°C to 85°C) and supply voltage tolerance (4.5V–5.5V) compared to the original specification. These parts maintain full RS422/RS485 1/1 transceiver functionality and are suitable for applications requiring broader environmental operating conditions. All are in active product status with ROHS3 compliance. ADM489ARZ-REEL is marked "Not For New Designs" and should be avoided for new development.

Alternative Hysteresis Specification:

LT1791CS#PBF and LT1791CS#TRPBF provide equivalent RS422/RS485 transceiver functionality with reduced receiver hysteresis (20 mV versus 70 mV). These parts maintain the same supply voltage and temperature range as the original MAX489ECSD and are suitable only when lower hysteresis specifications are acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can MAX489CSD+ directly replace MAX489ECSD in existing designs?

A: Yes. MAX489CSD+ is a parametric equivalent with identical electrical specifications, supply voltage range (4.75V–5.25V), operating temperature (0°C–70°C), and receiver hysteresis (70 mV). The primary difference is product status (active versus obsolete) and RoHS compliance. Pin-to-pin compatibility and functional behavior are equivalent.

Q: What is the difference between MAX489ECSD+ and MAX489CSD+?

A: Both are parametric equivalents of the original MAX489ECSD with identical electrical specifications. The difference lies in packaging designation: MAX489ECSD+ maintains the "E" temperature grade designation, while MAX489CSD+ uses the "C" designation. Both are active and ROHS3 compliant.

Q: When should I use ADM489ARZ-REEL7 instead of MAX489CSD+?

A: ADM489ARZ-REEL7 is appropriate when your application requires extended operating temperature range (-40°C to 85°C) or broader supply voltage tolerance (4.5V–5.5V). If your design operates within 0°C–70°C and 4.75V–5.25V, MAX489CSD+ is the preferred choice due to its active status and direct parametric equivalence.

Q: Are ISL4489EIBZ and ISL8489EIBZ interchangeable?

A: Both Renesas parts are functionally equivalent RS422/RS485 1/1 transceivers with identical electrical specifications, supply voltage (4.5V–5.5V), operating temperature (-40°C–85°C), and receiver hysteresis (70 mV). The primary difference is base product number (ISL4489 versus ISL8489). Both are active and ROHS3 compliant. Verify specific part availability and lead times with your supplier.

Q: Why do LT1791CS#PBF and LT1791CS#TRPBF have different receiver hysteresis?

A: LT1791 series parts feature 20 mV receiver hysteresis compared to 70 mV in the MAX489ECSD. This reduced hysteresis may provide improved noise immunity in certain applications but requires validation against your system's signal integrity requirements. Use only if your design specifications explicitly allow or require lower hysteresis values.

Q: What packaging options are available for these substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube, Tape & Reel (TR), and Cut Tape (CT) with Digi-Reel. Select packaging based on your procurement and assembly requirements. All parts maintain the same 14-SOIC physical form factor and surface mount mounting type.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant except the original MAX489ECSD, which is RoHS non-compliant. If RoHS compliance is required for your application, select from the active substitute parts: MAX489CSD+, MAX489ECSD+, ADM489ARZ-REEL7, ISL4489EIBZ, ISL4489EIBZ-T, ISL8489EIBZ, ISL8489EIBZ-T, LT1791CS#PBF, or LT1791CS#TRPBF.

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