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SP1490ECN-L RS422/RS485 Transceiver Equivalent & Substitute Parts
Part Overview
The SP1490ECN-L is a full-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., housed in an 8-SOIC surface mount package. This device operates at 4.75V to 5.25V supply voltage with a 20 Mbps data rate and 70 mV receiver hysteresis. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functionality.
Substiute Parts
Key Parameters
| Parameter | SP1490ECN-L |
|---|---|
| Manufacturer | MaxLinear, Inc. |
| Type | Transceiver |
| Protocol | RS422, RS485 |
| Duplex | Full |
| Number of Drivers/Receivers | 1/1 |
| Data Rate | 20 Mbps |
| Voltage - Supply | 4.75V ~ 5.25V |
| Receiver Hysteresis | 70 mV |
| Operating Temperature | 0°C ~ 70°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the SP1490ECN-L is determined by the following critical parameters:
Mandatory Compatibility Parameters:
- Protocol: RS422/RS485 full-duplex operation
- Configuration: 1 driver / 1 receiver
- Package: 8-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- Duplex Mode: Full
Allowable Variation Parameters:
- Voltage Supply Range: Substitutes must support the 4.75V to 5.25V range or a compatible superset
- Data Rate: Substitutes operating at 10 Mbps or higher satisfy the functional requirement
- Receiver Hysteresis: Substitutes with 30 mV, 50 mV, or 70 mV are functionally compatible
- Operating Temperature: Substitutes with extended or equivalent temperature ranges are acceptable
- Product Status: Active substitutes are preferred for long-term availability
Substitute parts are grouped by voltage supply compatibility and data rate capability, with all candidates meeting the core RS422/RS485 transceiver specification in the 8-SOIC package.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Drivers/Receivers | Data Rate | Voltage Supply | Receiver Hysteresis | Operating Temp | Package | Product Status | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|---|
| SP1490ECN-L | MaxLinear, Inc. | RS422, RS485 | 1/1 | 20 Mbps | 4.75V ~ 5.25V | 70 mV | 0°C ~ 70°C | 8-SOIC | Obsolete | — |
| ADM1490EBRZ | Analog Devices Inc. | RS422, RS485 | 1/1 | 16 Mbps | 4.75V ~ 5.25V | 30 mV | -40°C ~ 85°C | 8-SOIC | Active | Tube |
| ADM1490EBRZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 | 16 Mbps | 4.75V ~ 5.25V | 30 mV | -40°C ~ 85°C | 8-SOIC | Active | Tape & Reel (TR) |
| ADM3490ARZ | Analog Devices Inc. | RS422, RS485 | 1/1 | 10 Mbps | 3V ~ 3.6V | 50 mV | -40°C ~ 85°C | 8-SOIC | Active | Tube |
| ADM3490ARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 | 10 Mbps | 3V ~ 3.6V | 50 mV | -40°C ~ 85°C | 8-SOIC | Active | Cut Tape (CT) & Digi-Reel® |
| ADM3490EARZ | Analog Devices Inc. | RS422, RS485 | 1/1 | 10 Mbps | 3V ~ 3.6V | 50 mV | -40°C ~ 85°C | 8-SOIC | Active | Tube |
| ADM3490EARZ-REEL7 | Analog Devices Inc. | RS422, RS485 | 1/1 | 10 Mbps | 3V ~ 3.6V | 50 mV | -40°C ~ 85°C | 8-SOIC | Active | Cut Tape (CT) & Digi-Reel® |
| ISL83490IBZ | Renesas Electronics Corporation | RS422, RS485 | 1/1 | 10 Mbps | 3V ~ 3.6V | 50 mV | -40°C ~ 85°C | 8-SOIC | Active | Tube |
| ISL83490IBZ-T | Renesas Electronics Corporation | RS422, RS485 | 1/1 | 10 Mbps | 3V ~ 3.6V | 50 mV | -40°C ~ 85°C | 8-SOIC | Active | Cut Tape (CT) & Digi-Reel® |
| ISL8490EIBZ | Renesas Electronics Corporation | RS422, RS485 | 1/1 | 10 Mbps | 4.5V ~ 5.5V | 70 mV | -40°C ~ 85°C | 8-SOIC | Active | Tube |
| ISL8490EIBZ-T | Renesas Electronics Corporation | RS422, RS485 | 1/1 | 10 Mbps | 4.5V ~ 5.5V | 70 mV | -40°C ~ 85°C | 8-SOIC | Active | Tape & Reel (TR) |
Engineering Selection Recommendations
5V Supply Voltage Systems (4.75V ~ 5.25V):
For designs operating at 5V supply voltage, the ADM1490EBRZ and ADM1490EBRZ-REEL7 are direct voltage-compatible substitutes. Both are manufactured by Analog Devices Inc. and maintain active product status with ROHS3 compliance. The ADM1490 series operates at 16 Mbps, which exceeds the minimum functional requirement. These parts are available in Tube and Tape & Reel packaging options.
The ISL8490EIBZ and ISL8490EIBZ-T from Renesas Electronics Corporation provide an alternative for 5V systems with matching 70 mV receiver hysteresis. These parts operate at 4.5V ~ 5.5V, encompassing the original supply range. Both are active products with ROHS3 compliance and available in Tube and Tape & Reel formats.
3.3V Supply Voltage Systems (3V ~ 3.6V):
For designs requiring 3.3V operation, the ADM3490 series (ADM3490ARZ, ADM3490ARZ-REEL7, ADM3490EARZ, ADM3490EARZ-REEL7) and ISL83490 series (ISL83490IBZ, ISL83490IBZ-T) are suitable substitutes. All are active products with ROHS3 compliance. The ADM3490 variants are manufactured by Analog Devices Inc., while ISL83490 variants are from Renesas Electronics Corporation. These parts operate at 10 Mbps and are available in multiple packaging configurations.
Product Status Consideration:
All listed substitute parts maintain active product status, ensuring long-term availability and manufacturing support compared to the obsolete SP1490ECN-L.
Frequently Asked Questions (FAQ)
Q: Can the ADM1490EBRZ directly replace the SP1490ECN-L in a 5V system?
A: Yes. Both operate at 4.75V ~ 5.25V supply voltage, support full-duplex RS422/RS485 communication with 1 driver and 1 receiver in an 8-SOIC package. The ADM1490EBRZ operates at 16 Mbps, which meets the functional requirement. The primary difference is the receiver hysteresis (30 mV vs. 70 mV) and extended operating temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C).
Q: What is the difference between ADM1490EBRZ and ADM1490EBRZ-REEL7?
A: Both parts are electrically identical. The difference is packaging: ADM1490EBRZ is supplied in Tube format, while ADM1490EBRZ-REEL7 is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and volume.
Q: Can I use a 3.3V substitute in a 5V system?
A: No. The ADM3490 and ISL83490 series are specified for 3V ~ 3.6V operation. Using them in a 5V system exceeds their maximum supply voltage rating and will cause device failure.
Q: Why do some substitutes have lower data rates than the SP1490ECN-L?
A: The SP1490ECN-L operates at 20 Mbps, while most active substitutes operate at 10 or 16 Mbps. For applications requiring only 10 Mbps or lower data rates, these substitutes are functionally compatible. For applications requiring 20 Mbps operation, only the ADM1490EBRZ series at 16 Mbps approaches this specification; however, 16 Mbps may be insufficient for 20 Mbps designs.
Q: What is the significance of receiver hysteresis differences?
A: Receiver hysteresis affects noise immunity and switching threshold behavior. The SP1490ECN-L has 70 mV hysteresis. Substitutes with 30 mV or 50 mV hysteresis provide tighter threshold control but may be more sensitive to noise. Substitutes with 70 mV hysteresis (ISL8490EIBZ series) maintain identical noise immunity characteristics.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts are ROHS3 compliant, meeting environmental and regulatory requirements for electronic components.
Q: What packaging options are available for substitutes?
A: Substitute parts are available in Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel® formats. Selection depends on assembly equipment compatibility and volume requirements.
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