MAX490EESA-T RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The MAX490EESA-T is a full-duplex RS422/RS485 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface mount package. This part is classified as obsolete, with 747 units currently in stock. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, system maintenance, and long-term component availability. Active alternatives with identical or compatible electrical and mechanical specifications are available from the same manufacturer.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX490EESA-T
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Category	Interface Transceiver
Protocol Support	RS422, RS485
Duplex Configuration	Full
Number of Drivers/Receivers	1/1
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Supply Voltage Range	4.75V ~ 5.25V
Operating Temperature Range	-40°C ~ 85°C
Receiver Hysteresis	70 mV
Data Rate	2.5 Mbps
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAX490EESA-T is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol Support: RS422 and RS485 full-duplex operation
Driver/Receiver Configuration: 1/1 topology
Package Type: 8-SOIC surface mount form factor
Supply Voltage Range: 4.75V ~ 5.25V compatibility
Operating Temperature Range: -40°C ~ 85°C minimum coverage
RoHS Compliance: ROHS3 Compliant status
Moisture Sensitivity Level: MSL 1 (Unlimited)

Flexible Parameters (allowing substitution with documented differences):

Receiver Hysteresis: 70 mV (original) vs. 20 mV (ADM series alternatives)
Data Rate: 2.5 Mbps (original) vs. variable rates in alternatives (115 Kbps to 10 Mbps)
Product Status: Obsolete (original) vs. Active (all alternatives)
Packaging Format: Tube, Cut Tape & Digi-Reel, or Tape & Reel options

Substitute parts are grouped into three categories: parametric equivalents (identical electrical specifications with different packaging), direct manufacturer alternatives (same base functionality with minor specification variations), and manufacturer-recommended upgrades (enhanced performance variants with maintained compatibility).

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Package	Supply Voltage	Operating Temp	Receiver Hysteresis	Data Rate	Product Status	RoHS
MAX490EESA-T	Analog Devices/Maxim	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	2.5 Mbps	Obsolete	ROHS3
MAX490EESA+T	Analog Devices/Maxim	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	2.5 Mbps	Active	ROHS3
MAX490ESA+T	Analog Devices/Maxim	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	2.5 Mbps	Active	ROHS3
LTC490IS8#PBF	Analog Devices	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	—	Active	ROHS3
LTC490IS8#TRPBF	Analog Devices	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	—	Active	ROHS3
ADM4854ARZ	Analog Devices	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	20 mV	115 Kbps	Active	ROHS3
ADM4855ARZ	Analog Devices	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	20 mV	500 Kbps	Active	ROHS3
ADM4856ARZ	Analog Devices	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	20 mV	2.5 Mbps	Active	ROHS3
ADM4856ARZ-REEL7	Analog Devices	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	20 mV	2.5 Mbps	Active	ROHS3
ADM4857ARZ	Analog Devices	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	20 mV	10 Mbps	Active	ROHS3
ADM4857ARZ-REEL7	Analog Devices	RS422, RS485	1/1	Full	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	20 mV	10 Mbps	Active	ROHS3

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement): MAX490EESA+T and MAX490ESA+T are parametric equivalents with identical electrical specifications to the MAX490EESA-T. Both parts maintain 70 mV receiver hysteresis, 2.5 Mbps data rate, and full RS422/RS485 duplex operation. These parts are active products with ROHS3 compliance and MSL 1 rating. Selection between these variants depends on packaging requirements: MAX490EESA+T is available in Cut Tape & Digi-Reel format with 16,202 units in stock, while MAX490ESA+T is similarly packaged with 31,378 units in stock.

Direct Manufacturer Alternatives: LTC490IS8#PBF and LTC490IS8#TRPBF are direct alternatives from Analog Devices with identical protocol support, duplex configuration, and package type. Both maintain the 70 mV receiver hysteresis specification. Data rate is not specified for these parts. LTC490IS8#PBF is supplied in Tube packaging (2,600 units), while LTC490IS8#TRPBF is supplied in Tape & Reel format (2,400 units). Both are active products with ROHS3 compliance.

Manufacturer-Recommended Upgrades: The ADM4854ARZ, ADM4855ARZ, ADM4856ARZ, and ADM4857ARZ series represent manufacturer-recommended alternatives with enhanced specifications. All maintain identical package type, supply voltage range, and operating temperature range. Key differences include reduced receiver hysteresis (20 mV vs. 70 mV) and variable data rates: ADM4854ARZ (115 Kbps), ADM4855ARZ (500 Kbps), ADM4856ARZ (2.5 Mbps), and ADM4857ARZ (10 Mbps). All are active products with ROHS3 compliance. Packaging variants with -REEL7 suffix indicate Cut Tape & Digi-Reel format availability.

Selection Criteria:

For direct replacement with identical specifications: Select MAX490EESA+T or MAX490ESA+T
For active product status with maintained performance: Select LTC490IS8 variants
For enhanced performance with lower hysteresis: Select ADM4856ARZ (2.5 Mbps match) or ADM4857ARZ (10 Mbps upgrade)
For packaging-specific requirements: Verify tube, cut tape, or tape & reel availability per application assembly process

Frequently Asked Questions (FAQ)

Q: Can MAX490EESA+T directly replace MAX490EESA-T in existing designs? A: Yes. MAX490EESA+T is a parametric equivalent with identical electrical specifications: 70 mV receiver hysteresis, 2.5 Mbps data rate, RS422/RS485 full-duplex operation, and 8-SOIC package. The primary difference is product status (active vs. obsolete) and packaging format (Cut Tape & Digi-Reel vs. original packaging).

Q: What is the difference between MAX490ESA+T and MAX490EESA+T? A: Both parts are parametric equivalents with identical electrical specifications and package type. The difference lies in inventory availability: MAX490ESA+T has 31,378 units in stock compared to MAX490EESA+T with 16,202 units. Both are active products suitable for new designs and replacements.

Q: Can ADM4856ARZ replace MAX490EESA-T? A: ADM4856ARZ is a manufacturer-recommended alternative with compatible electrical operation. It maintains the same 2.5 Mbps data rate, RS422/RS485 protocol support, full-duplex configuration, and 8-SOIC package. The receiver hysteresis is reduced from 70 mV to 20 mV. This lower hysteresis may improve noise immunity in certain applications but does not prevent functional compatibility.

Q: What is the advantage of ADM4857ARZ over MAX490EESA-T? A: ADM4857ARZ offers enhanced data rate capability (10 Mbps vs. 2.5 Mbps) while maintaining all other critical parameters: RS422/RS485 protocol support, full-duplex operation, 8-SOIC package, and 4.75V ~ 5.25V supply voltage range. The reduced receiver hysteresis (20 mV) provides improved noise discrimination. This part is suitable for applications requiring higher bandwidth.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts, including MAX490EESA+T, MAX490ESA+T, LTC490IS8 variants, and the ADM485x series, are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in three packaging formats: Tube (standard shipping), Cut Tape & Digi-Reel (automated assembly), and Tape & Reel (high-volume production). Specific variants are identified by packaging suffixes: standard part numbers indicate tube packaging, +T suffix indicates cut tape format, #TRPBF indicates tape & reel, and -REEL7 suffix indicates digi-reel format.

Q: Can LTC490IS8 variants be used interchangeably with MAX490 variants? A: LTC490IS8 parts are direct manufacturer alternatives with identical protocol support, duplex configuration, and package type. Both maintain 70 mV receiver hysteresis. Data rate is not specified for LTC490IS8 variants. Functional compatibility is confirmed for RS422/RS485 applications within the specified operating temperature and supply voltage ranges.

Q: Why is receiver hysteresis different in ADM485x parts? A: The ADM485x series features reduced receiver hysteresis (20 mV vs. 70 mV), which provides improved noise discrimination and signal integrity in high-noise environments. This specification difference does not prevent functional substitution but may affect performance in applications with marginal signal quality.

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