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SP485RCN-L Equivalent & Substitute Parts
Part Overview
The SP485RCN-L is a half-duplex RS422/RS485 transceiver IC manufactured by MaxLinear, Inc., housed in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The device operates at 5V supply voltage with a 5 Mbps data rate and supports industrial communication protocols requiring half-duplex transceiver functionality.
Substiute Parts
Key Parameters
| Parameter | SP485RCN-L |
|---|---|
| Manufacturer | MaxLinear, Inc. |
| Type | Transceiver Half-Duplex |
| Protocol | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 |
| Data Rate | 5 Mbps |
| Voltage Supply | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C |
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the SP485RCN-L is determined by the following critical parameters:
- Protocol compatibility: RS422/RS485 half-duplex operation
- Driver/Receiver configuration: 1/1 topology
- Package type: 8-SOIC form factor
- Supply voltage range: 4.75V ~ 5.25V (5V operation)
- Data rate capability: minimum 5 Mbps
- Mounting type: Surface mount
Substitute parts are grouped into two categories based on supply voltage compatibility:
Category A (5V Supply): Parts operating within the 4.75V ~ 5.25V range, directly compatible with the original SP485RCN-L electrical specifications.
Category B (3V Supply): Parts operating at 3V ~ 3.6V supply voltage, requiring circuit redesign and power supply modification. These are not direct pin-compatible substitutes for 5V applications.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Data Rate | Supply Voltage | Operating Temp | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| SP485RCN-L | MaxLinear, Inc. | RS422, RS485 | 5 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Obsolete | Not specified |
| SP485REN-L/TR | MaxLinear, Inc. | RS422, RS485 | 5 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | RoHS Compliant |
| ST485ECDR | STMicroelectronics | RS422, RS485 | 5 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ | Analog Devices Inc. | RS422, RS485 | 30 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ-REEL | Analog Devices Inc. | RS422, RS485 | 30 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485ARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 30 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485JRZ | Analog Devices Inc. | RS422, RS485 | 30 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM1485JRZ-REEL | Analog Devices Inc. | RS422, RS485 | 30 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM3485ARZ | Analog Devices Inc. | RS422, RS485 | 10 Mbps | 3V ~ 3.6V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM3485ARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 10 Mbps | 3V ~ 3.6V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
| ADM3485EARZ | UMW | RS422, RS485 | 12 Mbps | 2.97V ~ 3.63V | -40°C ~ 85°C | 8-SOIC | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (5V Supply, Direct Compatibility):
SP485REN-L/TR is the manufacturer-recommended successor from MaxLinear, Inc., maintaining identical electrical specifications while offering active product status and RoHS compliance. This part is the preferred choice for direct replacement in existing 5V designs.
ST485ECDR from STMicroelectronics provides equivalent 5V operation with matching data rate and temperature range (0°C ~ 70°C). ROHS3 compliance and active status support modern manufacturing requirements.
ADM1485 series (ARZ, ARZ-REEL, ARZ-REEL7, JRZ, JRZ-REEL) from Analog Devices Inc. operate at 5V supply with enhanced 30 Mbps data rate capability, exceeding the original 5 Mbps specification. These parts are suitable for applications requiring higher bandwidth. Temperature range variants (0°C ~ 70°C and -40°C ~ 85°C) accommodate different operating environments. All variants carry ROHS3 compliance and active product status.
Alternative Substitutes (3V Supply, Requires Circuit Redesign):
ADM3485 series (ARZ, ARZ-REEL7) and ADM3485EARZ operate at 3V supply voltage, requiring power supply modification and circuit redesign. These parts are not direct electrical substitutes for 5V applications and should only be selected when system redesign for 3V operation is feasible.
Frequently Asked Questions (FAQ)
Q: Can I use a 3V substitute part in a 5V circuit?
A: No. Parts such as ADM3485ARZ and ADM3485EARZ operate at 3V ~ 3.6V supply voltage and are not compatible with 5V circuits. Using these parts requires complete power supply redesign and circuit modification.
Q: What is the difference between ADM1485ARZ and ADM1485JRZ?
A: Both parts are from Analog Devices Inc. with identical 30 Mbps data rate and 5V supply specifications. The primary difference is operating temperature range: ADM1485ARZ supports -40°C ~ 85°C, while ADM1485JRZ supports 0°C ~ 70°C. Select based on your application's temperature requirements.
Q: What is the difference between tube and reel packaging?
A: Tube packaging (ADM1485ARZ, ADM1485JRZ) is suitable for lower-volume applications and manual assembly. Reel packaging (ADM1485ARZ-REEL, ADM1485ARZ-REEL7, ADM1485JRZ-REEL) is designed for automated pick-and-place assembly in high-volume production. Both contain identical die and electrical specifications.
Q: Is the SP485REN-L/TR a direct replacement for SP485RCN-L?
A: Yes. SP485REN-L/TR is the active successor from MaxLinear, Inc., with identical protocol (RS422/RS485), driver/receiver configuration (1/1), data rate (5 Mbps), supply voltage (4.75V ~ 5.25V), and 8-SOIC package. The extended operating temperature range (-40°C ~ 85°C) and RoHS compliance provide additional benefits for modern applications.
Q: Can I substitute a 30 Mbps part for a 5 Mbps application?
A: Yes. The ADM1485 series with 30 Mbps data rate is backward compatible with applications designed for 5 Mbps operation. Higher data rate capability does not affect performance in lower-speed applications. All other electrical parameters (supply voltage, protocol, package) must match the original specification.
Q: What does ROHS3 compliance mean?
A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive 3, restricting the use of specific hazardous materials in electrical and electronic equipment. This certification is required for many industrial and consumer applications in regulated markets.
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