MAX1483ESA RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The MAX1483ESA is a half-duplex RS422/RS485 transceiver IC manufactured by Analog Devices Inc./Maxim Integrated in an 8-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The MAX1483ESA operates within a 4.75V to 5.25V supply voltage range with a maximum data rate of 250kbps and receiver hysteresis of 75mV, designed for industrial communication applications requiring half-duplex serial transmission.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX1483ESA
Manufacturer	Analog Devices Inc./Maxim Integrated
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex Configuration	Half
Data Rate	250kbps
Receiver Hysteresis	75mV
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-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 MAX1483ESA is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Protocol: RS422/RS485 half-duplex operation
Package: 8-SOIC form factor with identical pinout
Supply Voltage: 4.75V ~ 5.25V range
Operating Temperature: -40°C ~ 85°C range
Mounting Type: Surface mount configuration
Number of Drivers/Receivers: 1/1 configuration

Secondary Compatibility Factors:

Data Rate: Substitute parts must support minimum 250kbps operation
Receiver Hysteresis: Acceptable range 70mV to 75mV
RoHS Compliance: Active substitutes are ROHS3 compliant
Moisture Sensitivity Level: MSL 1 (Unlimited)

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications) and manufacturer-recommended alternatives (enhanced performance characteristics within compatible operating parameters).

Parameter Comparison

Part Number	Manufacturer	Product Status	Data Rate	Receiver Hysteresis	Packaging	RoHS Status	Inventory (Pcs)
MAX1483ESA	Analog Devices Inc./Maxim Integrated	Obsolete	250kbps	75mV	Standard	RoHS non-compliant	14,685
MAX1483ESA+	Analog Devices Inc./Maxim Integrated	Active	250kbps	75mV	Tube	ROHS3 Compliant	1,900
ADM1485ARZ	Analog Devices Inc.	Active	30Mbps	70mV	Tube	ROHS3 Compliant	19,566
ADM1485ARZ-REEL	Analog Devices Inc.	Active	30Mbps	70mV	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant	30,400
ADM1485ARZ-REEL7	Analog Devices Inc.	Active	30Mbps	70mV	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant	15,100
ADM1486ARZ	Analog Devices Inc.	Active	30Mbps	70mV	Tube	ROHS3 Compliant	9,798
ADM1486ARZ-REEL	Analog Devices Inc.	Active	30Mbps	70mV	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant	220,788
ADM1486ARZ-REEL7	Analog Devices Inc.	Active	30Mbps	70mV	Tape & Reel (TR)	ROHS3 Compliant	4,269
ADM1487EARZ	Analog Devices Inc.	Active	2.5Mbps	70mV	Tube	ROHS3 Compliant	1,964
ADM1487EARZ-REEL7	Analog Devices Inc.	Active	2.5Mbps	70mV	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant	2,300
ADM483ARZ	Analog Devices Inc.	Active	250kbps	70mV	Tube	ROHS3 Compliant	15,420

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement): MAX1483ESA+ is the direct active equivalent with identical electrical specifications (250kbps data rate, 75mV receiver hysteresis). This part maintains full compatibility with existing designs and is ROHS3 compliant. Selection is appropriate for applications requiring no design modification.

Manufacturer-Recommended Alternatives: The ADM1485 and ADM1486 series provide enhanced performance with 30Mbps data rate capability while maintaining backward compatibility with 250kbps operation. These parts feature 70mV receiver hysteresis and are ROHS3 compliant. The ADM1485ARZ-REEL variant offers the highest inventory availability (30,400 units) for production requirements.

Legacy Data Rate Compatibility: ADM483ARZ maintains the original 250kbps data rate specification with ROHS3 compliance and active product status. This part is suitable for applications where data rate performance is not a limiting factor.

Lower Data Rate Applications: ADM1487EARZ series operates at 2.5Mbps and is appropriate for applications with reduced bandwidth requirements. This variant is available in both tube and cut tape packaging options.

All substitute parts maintain the 8-SOIC package form factor, 4.75V to 5.25V supply voltage range, -40°C to 85°C operating temperature, and MSL 1 moisture sensitivity level. All active substitutes are ROHS3 compliant, addressing regulatory requirements that the obsolete MAX1483ESA does not meet.

Frequently Asked Questions (FAQ)

Q: Can MAX1483ESA+ be used as a direct replacement for MAX1483ESA? A: Yes. MAX1483ESA+ is the parametric equivalent with identical electrical specifications, including 250kbps data rate and 75mV receiver hysteresis. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). Pinout and package are identical.

Q: What is the difference between ADM1485ARZ and ADM1486ARZ? A: Both parts share identical electrical specifications (30Mbps data rate, 70mV receiver hysteresis, 8-SOIC package). The primary distinction is the base product number (ADM1485 vs. ADM1486). Both are ROHS3 compliant and suitable for RS422/RS485 half-duplex applications. Selection between these variants should be based on inventory availability and packaging preference (tube vs. reel).

Q: Are the ADM1485ARZ-REEL and ADM1485ARZ-REEL7 variants electrically identical? A: Yes. Both variants are electrically identical with 30Mbps data rate and 70mV receiver hysteresis. The difference is in packaging format: ADM1485ARZ-REEL uses standard cut tape and Digi-Reel® packaging, while ADM1485ARZ-REEL7 also uses cut tape and Digi-Reel® format. Selection depends on production equipment compatibility and tape reel specifications.

Q: Can ADM1487EARZ be used in applications requiring 250kbps operation? A: ADM1487EARZ operates at 2.5Mbps maximum data rate, which exceeds the 250kbps requirement. However, this part is suitable only if the application does not require higher data rate performance. For applications where future bandwidth expansion is anticipated, ADM1485 or ADM1486 series (30Mbps) are more appropriate.

Q: What packaging options are available for high-volume production? A: ADM1486ARZ-REEL offers the highest inventory availability (220,788 units) in cut tape and Digi-Reel® packaging, suitable for automated assembly processes. ADM1485ARZ-REEL (30,400 units) and ADM1485ARZ-REEL7 (15,100 units) provide alternative high-volume options with identical electrical specifications.

Q: Are all substitute parts RoHS compliant? A: All active substitute parts listed are ROHS3 compliant. The original MAX1483ESA is RoHS non-compliant. For applications subject to RoHS regulations, any active substitute part is appropriate.

Q: What is the receiver hysteresis difference between MAX1483ESA and substitute parts? A: MAX1483ESA specifies 75mV receiver hysteresis. Most substitute parts (ADM1485, ADM1486, ADM1487, ADM483) specify 70mV. This 5mV difference is within typical application tolerances for RS422/RS485 communication and does not affect functional compatibility in standard industrial applications.

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