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MAX485ESA RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts
Part Overview
The MAX485ESA is a half-duplex RS422/RS485 transceiver manufactured by Analog Devices Inc./Maxim Integrated, packaged in 8-SOIC surface mount configuration. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this interface IC.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MAX485ESA |
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Type | Transceiver |
| Protocol | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Half |
| Data Rate | 2.5 Mbps |
| Receiver Hysteresis | 70 mV |
| 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 eligibility for the MAX485ESA is determined by strict alignment with the following critical parameters:
Mandatory Matching Parameters:
- Protocol: RS422/RS485
- Number of Drivers/Receivers: 1/1
- Duplex Mode: Half
- Receiver Hysteresis: 70 mV
- Voltage Supply Range: 4.75V ~ 5.25V
- Operating Temperature Range: -40°C ~ 85°C
- Package / Case: 8-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
Flexible Parameters (Data Rate):
- Data Rate: Substitute parts may exceed the 2.5 Mbps specification of the original part, provided all other parameters remain compliant
Substitute parts are categorized as follows:
Parametric Equivalents (Analog Devices MAX Series): MAX1487EESA+, MAX1487ESA+, MAX481EESA+, MAX481ESA+, MAX485EESA+, MAX485ESA+. These parts maintain identical electrical and mechanical specifications with active product status and RoHS3 compliance.
Direct Manufacturer Substitute (STMicroelectronics): ST485BDR provides equivalent functionality from an alternative manufacturer with active status and RoHS3 compliance.
Manufacturer Recommended Alternatives (Analog Devices ADM Series): ADM1485ARZ, ADM1485ARZ-REEL, ADM1485ARZ-REEL7. These parts support enhanced data rates (30 Mbps) while maintaining all other critical parameters and active product status.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Drivers/Receivers | Duplex | Data Rate | Hysteresis | Supply Voltage | Temp Range | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MAX485ESA | Analog Devices | RS422/RS485 | 1/1 | Half | 2.5 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Obsolete | Non-compliant |
| MAX1487EESA+ | Analog Devices | RS422/RS485 | 1/1 | Half | 2.5 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| MAX1487ESA+ | Analog Devices | RS422/RS485 | 1/1 | Half | 2.5 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| MAX481EESA+ | Analog Devices | RS422/RS485 | 1/1 | Half | 2.5 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| MAX481ESA+ | Analog Devices | RS422/RS485 | 1/1 | Half | 2.5 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| MAX485EESA+ | Analog Devices | RS422/RS485 | 1/1 | Half | 2.5 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| MAX485ESA+ | Analog Devices | RS422/RS485 | 1/1 | Half | 2.5 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ST485BDR | STMicroelectronics | RS422/RS485 | 1/1 | Half | 2.5 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ | Analog Devices | RS422/RS485 | 1/1 | Half | 30 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ-REEL | Analog Devices | RS422/RS485 | 1/1 | Half | 30 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ-REEL7 | Analog Devices | RS422/RS485 | 1/1 | Half | 30 Mbps | 70 mV | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
Engineering Selection Recommendations
For RoHS3 Compliance Requirements: Select from the active product status alternatives: MAX1487EESA+, MAX1487ESA+, MAX481EESA+, MAX481ESA+, MAX485EESA+, MAX485ESA+, ST485BDR, ADM1485ARZ, ADM1485ARZ-REEL, or ADM1485ARZ-REEL7. All substitute parts carry ROHS3 Compliant certification, addressing regulatory requirements that the original obsolete MAX485ESA does not meet.
For Direct Parametric Equivalence (2.5 Mbps Data Rate): MAX485ESA+ provides the closest functional replacement with identical electrical specifications, active product status, and RoHS3 compliance. This part maintains the original 2.5 Mbps data rate specification while offering superior availability and regulatory compliance.
For Enhanced Performance (30 Mbps Data Rate): ADM1485ARZ, ADM1485ARZ-REEL, and ADM1485ARZ-REEL7 support 30 Mbps data rates while maintaining all other critical parameters. These parts are suitable for applications where higher bandwidth capability provides design margin or future scalability, with no impact on existing 2.5 Mbps system operation.
For Cross-Manufacturer Sourcing: ST485BDR from STMicroelectronics provides an alternative supply source with identical electrical and mechanical specifications, active status, and RoHS3 compliance. This option reduces single-source dependency while maintaining full parameter compatibility.
Frequently Asked Questions (FAQ)
Q: Can MAX485ESA+ directly replace MAX485ESA without circuit modification?
A: Yes. MAX485ESA+ maintains identical electrical specifications, package configuration, and pinout. The primary difference is active product status and RoHS3 compliance. No circuit modifications are required.
Q: What is the difference between MAX485ESA+ and ADM1485ARZ?
A: Both parts are pin-compatible 8-SOIC transceivers with identical supply voltage, temperature range, and package specifications. The primary difference is data rate: MAX485ESA+ supports 2.5 Mbps, while ADM1485ARZ supports 30 Mbps. Systems designed for 2.5 Mbps operation function identically with either part.
Q: Is ST485BDR a suitable replacement for MAX485ESA?
A: Yes. ST485BDR from STMicroelectronics provides equivalent RS422/RS485 half-duplex transceiver functionality with identical electrical parameters, 8-SOIC packaging, and active product status. It serves as a cross-manufacturer alternative.
Q: Why are there multiple MAX part numbers (MAX481, MAX485, MAX1487) listed as substitutes?
A: These represent different base product lines within the Analog Devices transceiver family. All variants listed maintain the required 1/1 driver/receiver configuration, half-duplex mode, 70 mV hysteresis, and 8-SOIC packaging. Selection among these variants depends on specific design requirements and availability.
Q: Does packaging format (Tube vs. Cut Tape & Digi-Reel) affect electrical compatibility?
A: No. Packaging format affects only handling, storage, and supply chain logistics. Electrical and mechanical specifications remain identical regardless of packaging format. Selection should be based on manufacturing process requirements and inventory management practices.
Q: Can I use ADM1485ARZ in a system designed for 2.5 Mbps operation?
A: Yes. ADM1485ARZ supports 30 Mbps data rates, which is backward compatible with 2.5 Mbps system requirements. The higher data rate capability does not affect operation at lower speeds and provides additional design margin.
Q: What is the inventory status for substitute parts?
A: Inventory levels vary by part number and supplier. MAX485ESA+ (28,380 pcs), ST485BDR (173,888 pcs), and ADM1485ARZ-REEL (30,400 pcs) represent the highest available quantities. Verify current inventory with your component supplier for production planning.
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