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MAX3082ESA RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts
Part Overview
The MAX3082ESA 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, with 5,300 units currently in stock. The MAX3082ESA operates at 115 Kbps data rate with a 100 mV receiver hysteresis, designed for industrial communication applications requiring half-duplex serial transmission over twisted-pair cabling.
Due to the obsolete product status, equivalent and substitute parts are necessary for new designs, long-term availability assurance, and compliance with current RoHS regulations. Active alternatives from Analog Devices provide enhanced performance specifications, improved compliance certifications, and superior long-term supply chain reliability.
Substiute Parts
Key Parameters
| Parameter | MAX3082ESA |
|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Protocol Support | RS422, RS485 |
| Duplex Configuration | Half |
| Number of Drivers/Receivers | 1/1 |
| Data Rate | 115 Kbps |
| Receiver Hysteresis | 100 mV |
| Supply Voltage Range | 4.75V – 5.25V |
| Operating Temperature Range | -40°C to +85°C |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Compliance | Non-compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the MAX3082ESA is determined by strict adherence to the following critical parameters:
Core Compatibility Requirements:
- Protocol Support: RS422 and RS485 half-duplex operation
- Duplex Configuration: Half-duplex only
- Driver/Receiver Configuration: 1 driver / 1 receiver
- Package Type: 8-SOIC (0.154", 3.90mm Width)
- Supply Voltage: 4.75V – 5.25V
- Operating Temperature: -40°C to +85°C
- Mounting Type: Surface Mount
Performance Parameters (Allowable Variations):
- Data Rate: Substitute parts may exceed 115 Kbps specification
- Receiver Hysteresis: Substitute parts may differ from 100 mV
- Product Status: Active parts preferred over obsolete
- RoHS Compliance: ROHS3 compliant parts are preferred for new designs
All substitute parts listed maintain identical electrical interface specifications, package footprint compatibility, and thermal operating range. Differences in data rate and receiver hysteresis represent performance enhancements that do not compromise backward compatibility with existing MAX3082ESA circuit designs.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Duplex | Drivers/Receivers | Data Rate | Receiver Hysteresis | Supply Voltage | Operating Temp | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MAX3082ESA | Analog Devices/Maxim | RS422, RS485 | Half | 1/1 | 115 Kbps | 100 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Obsolete | Non-compliant |
| MAX3082EESA+ | Analog Devices/Maxim | RS422, RS485 | Half | 1/1 | 115 Kbps | 100 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Active | ROHS3 Compliant |
| MAX3082ESA+ | Analog Devices/Maxim | RS422, RS485 | Half | 1/1 | 115 Kbps | 100 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ | Analog Devices | RS422, RS485 | Half | 1/1 | 30 Mbps | 70 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ-REEL | Analog Devices | RS422, RS485 | Half | 1/1 | 30 Mbps | 70 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ-REEL7 | Analog Devices | RS422, RS485 | Half | 1/1 | 30 Mbps | 70 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1486ARZ | Analog Devices | RS422, RS485 | Half | 1/1 | 30 Mbps | 70 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1486ARZ-REEL | Analog Devices | RS422, RS485 | Half | 1/1 | 30 Mbps | 70 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1486ARZ-REEL7 | Analog Devices | RS422, RS485 | Half | 1/1 | 30 Mbps | 70 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1487EARZ | Analog Devices | RS422, RS485 | Half | 1/1 | 2.5 Mbps | 70 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1487EARZ-REEL7 | Analog Devices | RS422, RS485 | Half | 1/1 | 2.5 Mbps | 70 mV | 4.75V – 5.25V | -40°C to +85°C | 8-SOIC | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Parametric Equivalents (Identical Electrical Specifications):
MAX3082EESA+ and MAX3082ESA+ are direct parametric equivalents to the MAX3082ESA, maintaining identical data rate (115 Kbps), receiver hysteresis (100 mV), and all electrical interface specifications. Both parts are active products with ROHS3 compliance, providing immediate obsolescence mitigation with zero design modification required. These parts are the preferred choice for direct replacement in existing MAX3082ESA applications.
Manufacturer-Recommended Alternatives (Enhanced Performance):
The ADM1485 and ADM1486 series represent manufacturer-recommended alternatives offering superior performance specifications. These parts operate at 30 Mbps data rate with 70 mV receiver hysteresis, providing enhanced noise immunity and significantly higher bandwidth capability. All ADM1485 and ADM1486 variants are active products with ROHS3 compliance. These parts are suitable for new designs requiring higher data rates while maintaining full backward compatibility with MAX3082ESA circuit topologies.
The ADM1487EARZ and ADM1487EARZ-REEL7 are active alternatives with ROHS3 compliance, operating at 2.5 Mbps data rate. These parts are appropriate for applications where lower data rate operation is specified or where cost optimization is a design consideration.
Packaging and Supply Chain Considerations:
Tube packaging (standard) is suitable for prototype and low-volume production. Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) packaging options are optimized for high-volume automated assembly. Selection between packaging variants depends on production volume and assembly equipment compatibility, not electrical performance.
Frequently Asked Questions (FAQ)
Q: Can MAX3082EESA+ or MAX3082ESA+ be used as direct replacements for MAX3082ESA?
A: Yes. Both parts maintain identical electrical specifications including 115 Kbps data rate, 100 mV receiver hysteresis, RS422/RS485 protocol support, and 8-SOIC package footprint. No circuit modifications are required. The primary differences are active product status and ROHS3 compliance certification.
Q: What is the difference between ADM1485 and ADM1486 series?
A: Both series operate at 30 Mbps data rate with 70 mV receiver hysteresis and are electrically equivalent. Differences exist only in packaging options and supply chain availability. ADM1485ARZ-REEL offers 30,400 units in stock, while ADM1486ARZ-REEL provides 220,788 units. Selection should be based on procurement lead time and inventory requirements.
Q: Can ADM1485 or ADM1486 parts be used in applications designed for MAX3082ESA?
A: Yes. The ADM1485 and ADM1486 series maintain identical package footprint, supply voltage range (4.75V – 5.25V), operating temperature range (-40°C to +85°C), and RS422/RS485 protocol support. The enhanced 30 Mbps data rate and 70 mV receiver hysteresis represent performance improvements that do not compromise compatibility with existing MAX3082ESA circuit designs.
Q: What is the significance of receiver hysteresis differences?
A: Receiver hysteresis determines the voltage differential required to switch the receiver output state. The MAX3082ESA specifies 100 mV hysteresis, while ADM1485, ADM1486, and ADM1487 series specify 70 mV. Lower hysteresis (70 mV) provides improved noise immunity and faster signal transitions. This difference does not affect circuit compatibility.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed (MAX3082EESA+, MAX3082ESA+, ADM1485 series, ADM1486 series, and ADM1487 series) are ROHS3 compliant. The original MAX3082ESA is RoHS non-compliant, making substitution necessary for applications requiring RoHS certification.
Q: What packaging options are available, and how do they affect selection?
A: Tube packaging is standard for prototype and low-volume applications. Cut Tape (CT) & Digi-Reel® packaging is optimized for semi-automated assembly. Tape & Reel (TR) packaging is designed for high-volume automated pick-and-place assembly. All packaging variants contain electrically identical parts; selection depends on production volume and assembly equipment compatibility.
Q: Why does ADM1487EARZ operate at 2.5 Mbps while ADM1485 and ADM1486 operate at 30 Mbps?
A: The ADM1487 series is designed for lower-speed applications where cost optimization or reduced power consumption is prioritized. All three series maintain identical package footprint and electrical interface compatibility. Selection should be based on application data rate requirements.
Q: Is the ADM1485ARZ-REEL7 different from ADM1485ARZ-REEL?
A: Both parts are electrically identical. The "-REEL7" designation indicates a different reel configuration or supply chain variant. Electrical specifications, package type, and performance characteristics are identical. Selection depends on procurement availability and reel compatibility with assembly equipment.
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