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SP490ECN-L RS422/RS485 Transceiver Equivalent & Substitute Parts
Part Overview
The SP490ECN-L is a 1/1 full-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., housed in an 8-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and new production runs. The part operates within a 4.75V to 5.25V supply voltage range with a 10 Mbps data rate capability and 70 mV receiver hysteresis specification.
Substiute Parts
Key Parameters
| Parameter | SP490ECN-L |
|---|---|
| Manufacturer | MaxLinear, Inc. |
| Type | Transceiver |
| Protocol | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex | Full |
| Receiver Hysteresis | 70 mV |
| Data Rate | 10 Mbps |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the SP490ECN-L is determined by the following critical parameters:
Core Compatibility Requirements:
- Protocol: RS422/RS485 full-duplex transceiver
- Configuration: 1/1 drivers/receivers
- Package: 8-SOIC surface mount form factor
- Supply voltage compatibility with 4.75V ~ 5.25V range
- Data rate capability of 10 Mbps or higher
Grouping Logic:
Substitute parts are organized into two functional groups based on supply voltage specifications:
Group 1 - 5V Supply Range (4.75V ~ 5.25V): Parts operating within the original SP490ECN-L supply voltage window. These provide direct electrical compatibility without redesign.
Group 2 - 3V Supply Range (3V ~ 3.6V): Parts requiring lower supply voltage. These are suitable for systems redesigned for lower power operation but require voltage regulation verification.
Group 3 - Extended 5V Range (4.5V ~ 5.5V): Parts with expanded supply voltage tolerance, offering broader operational margins while maintaining 5V nominal compatibility.
All substitute parts maintain the 8-SOIC package specification, full-duplex RS422/RS485 protocol support, and 1/1 driver/receiver configuration.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Drivers/Receivers | Duplex | Receiver Hysteresis | Data Rate | Voltage - Supply | Operating Temperature | Package | Product Status | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|---|---|
| SP490ECN-L | MaxLinear, Inc. | RS422, RS485 | 1/1 | Full | 70 mV | 10 Mbps | 4.75V ~ 5.25V | 0°C ~ 70°C | 8-SOIC | Obsolete | - |
| ADM1490EBRZ | Analog Devices Inc. | RS422, RS485 | 1/1 | Full | 30 mV | 16 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | Tube |
| ADM1490EBRZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 | Full | 30 mV | 16 Mbps | 4.75V ~ 5.25V | -40°C ~ 85°C | 8-SOIC | Active | Tape & Reel (TR) |
| ADM3490ARZ | Analog Devices Inc. | RS422, RS485 | 1/1 | Full | 50 mV | 10 Mbps | 3V ~ 3.6V | -40°C ~ 85°C | 8-SOIC | Active | Tube |
| ADM3490ARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 | Full | 50 mV | 10 Mbps | 3V ~ 3.6V | -40°C ~ 85°C | 8-SOIC | Active | Cut Tape (CT) & Digi-Reel® |
| ADM3490EARZ | Analog Devices Inc. | RS422, RS485 | 1/1 | Full | 50 mV | 10 Mbps | 3V ~ 3.6V | -40°C ~ 85°C | 8-SOIC | Active | Tube |
| ADM3490EARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 | Full | 50 mV | 10 Mbps | 3V ~ 3.6V | -40°C ~ 85°C | 8-SOIC | Active | Cut Tape (CT) & Digi-Reel® |
| ISL83490IBZ | Renesas Electronics Corporation | RS422, RS485 | 1/1 | Full | 50 mV | 10 Mbps | 3V ~ 3.6V | -40°C ~ 85°C | 8-SOIC | Active | Tube |
| ISL83490IBZ-T | Renesas Electronics Corporation | RS422, RS485 | 1/1 | Full | 50 mV | 10 Mbps | 3V ~ 3.6V | -40°C ~ 85°C | 8-SOIC | Active | Cut Tape (CT) & Digi-Reel® |
| ISL8490EIBZ | Renesas Electronics Corporation | RS422, RS485 | 1/1 | Full | 70 mV | 10 Mbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active | Tube |
| ISL8490EIBZ-T | Renesas Electronics Corporation | RS422, RS485 | 1/1 | Full | 70 mV | 10 Mbps | 4.5V ~ 5.5V | -40°C ~ 85°C | 8-SOIC | Active | Tape & Reel (TR) |
Engineering Selection Recommendations
Primary Substitutes (5V Supply Range - Direct Compatibility):
ADM1490EBRZ and ADM1490EBRZ-REEL7 (Analog Devices Inc.) operate within the original 4.75V ~ 5.25V supply voltage specification. These parts are active products with ROHS3 compliance and extended operating temperature range (-40°C ~ 85°C). The ADM1490 series offers improved data rate performance (16 Mbps) compared to the SP490ECN-L (10 Mbps), with reduced receiver hysteresis (30 mV vs. 70 mV). Selection between tube and tape & reel packaging depends on production volume and assembly requirements.
ISL8490EIBZ and ISL8490EIBZ-T (Renesas Electronics Corporation) provide an alternative 5V supply option with expanded voltage tolerance (4.5V ~ 5.5V). These parts match the original receiver hysteresis specification (70 mV) and data rate (10 Mbps), with active product status and ROHS3 compliance. Extended operating temperature range (-40°C ~ 85°C) exceeds the original specification.
Secondary Substitutes (3V Supply Range - System Redesign Required):
ADM3490 series (ADM3490ARZ, ADM3490ARZ-REEL7, ADM3490EARZ, ADM3490EARZ-REEL7) and ISL83490 series (ISL83490IBZ, ISL83490IBZ-T) operate at 3V ~ 3.6V supply voltage. These parts are suitable only for systems redesigned for lower power operation. All variants maintain active product status, ROHS3 compliance, and extended operating temperature range (-40°C ~ 85°C). Data rate and receiver hysteresis specifications remain compatible with the original part.
Compliance and Availability:
All substitute parts carry ROHS3 compliance and REACH unaffected status. Inventory availability ranges from 1,420 to 17,800 units across variants, supporting both prototype and production requirements.
Frequently Asked Questions (FAQ)
Q: Can I directly replace SP490ECN-L with ADM1490EBRZ without circuit modifications?
A: Yes. The ADM1490EBRZ operates within the same 4.75V ~ 5.25V supply voltage range as the SP490ECN-L and maintains identical 8-SOIC package specifications. No circuit modifications are required for voltage supply or physical mounting. The improved data rate (16 Mbps vs. 10 Mbps) and reduced receiver hysteresis (30 mV vs. 70 mV) are backward compatible with systems designed for the original part.
Q: What is the difference between ADM1490EBRZ and ADM1490EBRZ-REEL7?
A: Both parts are electrically identical. The difference is packaging format. ADM1490EBRZ is supplied in tube packaging, suitable for lower-volume applications and manual assembly. ADM1490EBRZ-REEL7 is supplied in tape & reel format, optimized for automated pick-and-place assembly in high-volume production.
Q: Can I use ISL83490IBZ or ADM3490ARZ as direct replacements?
A: No. These parts operate at 3V ~ 3.6V supply voltage, incompatible with the original 4.75V ~ 5.25V specification. Use only if your system is redesigned for 3V operation with appropriate voltage regulation. Verify power supply capability before substitution.
Q: Why does ISL8490EIBZ have a different voltage range (4.5V ~ 5.5V) than the original?
A: ISL8490EIBZ provides expanded supply voltage tolerance, offering broader operational margins. The 4.5V ~ 5.5V range encompasses the original 4.75V ~ 5.25V specification, making it compatible with systems operating within the original voltage window. The extended range provides additional design flexibility for systems with variable supply voltages.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions for electronic components.
Q: What is the significance of receiver hysteresis differences?
A: Receiver hysteresis affects noise immunity and signal transition characteristics. The original SP490ECN-L specifies 70 mV hysteresis. Substitute parts offer 30 mV (ADM1490 series), 50 mV (ADM3490 and ISL83490 series), or 70 mV (ISL8490 series). Lower hysteresis values increase sensitivity to noise but improve signal detection speed. Higher values provide greater noise immunity. Select based on your system's noise environment and signal integrity requirements.
Q: What is the operating temperature range difference, and does it matter?
A: The original SP490ECN-L operates 0°C ~ 70°C. All substitute parts extend this to -40°C ~ 85°C. If your application operates within the original 0°C ~ 70°C window, any substitute part is suitable. Extended range provides additional margin for industrial or automotive environments operating outside the original specification.
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