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MAX487ESA-T RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts
Part Overview
The MAX487ESA-T is a half-duplex RS422/RS485 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface mount package. This device is classified as obsolete, with 5,465 units currently in stock. Due to its obsolete status, identifying active equivalent and substitute parts is essential for design continuity and long-term supply chain reliability. Substitute parts must maintain identical electrical performance characteristics and package compatibility while offering active product status and improved compliance certifications.
Substiute Parts
Key Parameters
| Parameter | MAX487ESA-T |
|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Protocol | RS422, RS485 |
| Duplex Configuration | Half |
| Number of Drivers/Receivers | 1/1 |
| Receiver Hysteresis | 70 mV |
| Data Rate | 250 kbps |
| Supply Voltage | 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 |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict adherence to the following parameters:
Critical Matching Parameters:
- Protocol: RS422/RS485 half-duplex configuration
- Number of Drivers/Receivers: 1/1
- Receiver Hysteresis: 70 mV
- Supply Voltage Range: 4.75V ~ 5.25V
- Package/Case: 8-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- Moisture Sensitivity Level: 1 (Unlimited)
Allowable Variation Parameters:
- Data Rate: Substitute parts may exceed the 250 kbps specification
- Operating Temperature: Substitute parts may have narrower or equivalent temperature ranges
- Product Status: Active status preferred for supply continuity
- RoHS Compliance: ROHS3 compliance is an improvement over non-compliant status
Substitute parts are grouped into two categories: Parametric Equivalents (MAX483 and MAX487 series with active status) and Manufacturer-Recommended alternatives (ADM1485 and ADM1486 series with enhanced data rate specifications).
Parameter Comparison
| Part Number | Manufacturer | Protocol | Drivers/Receivers | Hysteresis | Data Rate | Supply Voltage | Temp Range | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| MAX487ESA-T | Analog Devices/Maxim | RS422/RS485 | 1/1 | 70 mV | 250 kbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Obsolete | Non-compliant |
| MAX483EESA+T | Analog Devices/Maxim | RS422/RS485 | 1/1 | 70 mV | 250 kbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| MAX483ESA+T | Analog Devices/Maxim | RS422/RS485 | 1/1 | 70 mV | 250 kbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| MAX487EESA+T | Analog Devices/Maxim | RS422/RS485 | 1/1 | 70 mV | 250 kbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| MAX487ESA+T | Analog Devices/Maxim | RS422/RS485 | 1/1 | 70 mV | 250 kbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ | Analog Devices | RS422/RS485 | 1/1 | 70 mV | 30 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ-REEL | Analog Devices | RS422/RS485 | 1/1 | 70 mV | 30 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ-REEL7 | Analog Devices | RS422/RS485 | 1/1 | 70 mV | 30 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485JRZ | Analog Devices | RS422/RS485 | 1/1 | 70 mV | 30 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485JRZ-REEL | Analog Devices | RS422/RS485 | 1/1 | 70 mV | 30 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1486ARZ | Analog Devices | RS422/RS485 | 1/1 | 70 mV | 30 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Parametric Equivalent Parts (Preferred for Direct Replacement):
MAX483EESA+T, MAX483ESA+T, MAX487EESA+T, and MAX487ESA+T are parametric equivalents offering identical electrical specifications to the MAX487ESA-T. These parts maintain the 250 kbps data rate, 70 mV receiver hysteresis, and -40°C to 85°C operating temperature range. All four parts are in active product status with ROHS3 compliance, providing superior supply chain continuity and regulatory alignment compared to the obsolete, non-compliant original part. Inventory availability ranges from 4,900 to 55,100 units.
Manufacturer-Recommended Alternatives (Enhanced Performance):
ADM1485 and ADM1486 series parts are manufacturer-recommended substitutes offering enhanced data rate performance at 30 Mbps, exceeding the original 250 kbps specification. These parts maintain all critical electrical parameters including 70 mV receiver hysteresis, 4.75V to 5.25V supply voltage, and 8-SOIC packaging. All variants are active products with ROHS3 compliance and EAR99 export classification.
Temperature Range Consideration:
ADM1485JRZ and ADM1485JRZ-REEL operate within a narrower temperature range (0°C to 70°C) compared to the original part's -40°C to 85°C specification. These variants are suitable only for applications not requiring extended low-temperature or high-temperature operation.
Packaging Format Selection:
Tube packaging (ADM1485ARZ, ADM1485JRZ, ADM1486ARZ) and Cut Tape with Digi-Reel format (ADM1485ARZ-REEL, ADM1485ARZ-REEL7, ADM1485JRZ-REEL) are available. Selection depends on assembly process requirements and volume considerations.
Frequently Asked Questions (FAQ)
Q: Can MAX483 series parts directly replace MAX487ESA-T?
A: Yes. MAX483EESA+T and MAX483ESA+T are parametric equivalents with identical electrical specifications, including protocol, duplex configuration, driver/receiver count, hysteresis, data rate, supply voltage, and operating temperature range. Both are housed in 8-SOIC packages and are active products with ROHS3 compliance.
Q: What is the primary advantage of ADM1485 and ADM1486 series substitutes?
A: ADM1485 and ADM1486 series parts offer a 30 Mbps data rate compared to the original 250 kbps specification, providing enhanced performance headroom for future applications. All critical electrical parameters remain identical, and all variants are active products with ROHS3 compliance.
Q: Are there temperature range limitations with any substitute parts?
A: ADM1485JRZ and ADM1485JRZ-REEL operate within 0°C to 70°C, which is narrower than the original -40°C to 85°C range. These variants are not suitable for applications requiring extended temperature operation. ADM1485ARZ, ADM1485ARZ-REEL, ADM1485ARZ-REEL7, and ADM1486ARZ maintain the full -40°C to 85°C range.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in Tube packaging and Cut Tape with Digi-Reel format. Tube packaging is standard for lower-volume applications, while Cut Tape with Digi-Reel format is optimized for automated assembly processes and higher volumes.
Q: Do all substitute parts meet RoHS compliance requirements?
A: Yes. All substitute parts listed are ROHS3 compliant, providing regulatory advantage over the original MAX487ESA-T, which is RoHS non-compliant. ADM1485 and ADM1486 series parts carry EAR99 export classification.
Q: Which substitute part offers the best supply availability?
A: MAX487ESA+T offers the highest inventory level at 55,100 units in stock, followed by MAX487EESA+T with 23,610 units. Both are parametric equivalents with active product status and ROHS3 compliance.
Q: Can substitute parts be used in existing PCB designs without modification?
A: Yes. All substitute parts maintain identical 8-SOIC (0.154", 3.90mm Width) packaging and pin configuration, enabling direct PCB footprint compatibility without design changes.
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