SP490EEN-L RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The SP490EEN-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 and new designs requiring compatible functionality.

The SP490EEN-L operates within a 4.75V to 5.25V supply voltage range with a 10 Mbps data rate capability and 70 mV receiver hysteresis. Its 8-SOIC (0.154", 3.90mm width) package and full-duplex transceiver architecture define its core electrical and mechanical compatibility parameters.

Key Parameters

Parameter	SP490EEN-L Value
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	-40°C ~ 85°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 of the SP490EEN-L is determined by strict adherence to the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Protocol: RS422/RS485 full-duplex transceiver
Driver/Receiver Configuration: 1/1
Package Type: 8-SOIC surface mount
Operating Temperature Range: -40°C ~ 85°C
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Criteria:

Supply Voltage Range: Must encompass or match 4.75V ~ 5.25V
Data Rate: Minimum 10 Mbps
Receiver Hysteresis: 50 mV or greater

Substitute parts are grouped into two categories based on supply voltage compatibility:

Group 1 - 5V Supply Voltage (4.75V ~ 5.25V): Direct voltage-compatible substitutes with matching or superior electrical performance.

Group 2 - 3V Supply Voltage (3V ~ 3.6V): Alternative supply voltage requiring system-level voltage compatibility verification. These parts maintain identical package, protocol, and functional architecture but operate at lower supply voltages.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Supply Voltage	Data Rate	Receiver Hysteresis	Package	Operating Temp	Product Status	Packaging Type
SP490EEN-L	MaxLinear, Inc.	RS422, RS485	1/1	4.75V ~ 5.25V	10 Mbps	70 mV	8-SOIC	-40°C ~ 85°C	Obsolete	Tube
ADM1490EBRZ	Analog Devices Inc.	RS422, RS485	1/1	4.75V ~ 5.25V	16 Mbps	30 mV	8-SOIC	-40°C ~ 85°C	Active	Tube
ADM1490EBRZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	4.75V ~ 5.25V	16 Mbps	30 mV	8-SOIC	-40°C ~ 85°C	Active	Tape & Reel (TR)
ADM3490ARZ	Analog Devices Inc.	RS422, RS485	1/1	3V ~ 3.6V	10 Mbps	50 mV	8-SOIC	-40°C ~ 85°C	Active	Tube
ADM3490ARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	3V ~ 3.6V	10 Mbps	50 mV	8-SOIC	-40°C ~ 85°C	Active	Cut Tape (CT) & Digi-Reel®
ADM3490EARZ	Analog Devices Inc.	RS422, RS485	1/1	3V ~ 3.6V	10 Mbps	50 mV	8-SOIC	-40°C ~ 85°C	Active	Tube
ADM3490EARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	3V ~ 3.6V	10 Mbps	50 mV	8-SOIC	-40°C ~ 85°C	Active	Cut Tape (CT) & Digi-Reel®
ISL83490IBZ	Renesas Electronics Corporation	RS422, RS485	1/1	3V ~ 3.6V	10 Mbps	50 mV	8-SOIC	-40°C ~ 85°C	Active	Tube
ISL83490IBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	3V ~ 3.6V	10 Mbps	50 mV	8-SOIC	-40°C ~ 85°C	Active	Cut Tape (CT) & Digi-Reel®
ISL8490EIBZ	Renesas Electronics Corporation	RS422, RS485	1/1	4.5V ~ 5.5V	10 Mbps	70 mV	8-SOIC	-40°C ~ 85°C	Active	Tube
ISL8490EIBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	4.5V ~ 5.5V	10 Mbps	70 mV	8-SOIC	-40°C ~ 85°C	Active	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct 5V Supply Voltage Replacement:

ADM1490EBRZ and ADM1490EBRZ-REEL7 (Analog Devices Inc.) provide the closest electrical match to SP490EEN-L within the 4.75V ~ 5.25V supply voltage range. Both parts are active products with ROHS3 compliance and REACH unaffected status. The ADM1490EBRZ offers superior data rate performance at 16 Mbps compared to the SP490EEN-L's 10 Mbps specification. Selection between tube (ADM1490EBRZ) and tape & reel (ADM1490EBRZ-REEL7) packaging depends on procurement and assembly requirements.

ISL8490EIBZ and ISL8490EIBZ-T (Renesas Electronics Corporation) provide an alternative 5V-compatible option with matching receiver hysteresis (70 mV) and data rate (10 Mbps) to the original SP490EEN-L. Supply voltage range extends to 4.5V ~ 5.5V, providing broader operational margin. Both variants are active products with ROHS3 compliance. Tube (ISL8490EIBZ) and tape & reel (ISL8490EIBZ-T) packaging options are available.

For 3V Supply Voltage Systems:

ADM3490 series (ADM3490ARZ, ADM3490ARZ-REEL7, ADM3490EARZ, ADM3490EARZ-REEL7) and ISL83490 series (ISL83490IBZ, ISL83490IBZ-T) operate within 3V ~ 3.6V supply voltage range. These parts maintain identical 1/1 full-duplex RS422/RS485 transceiver architecture and 8-SOIC package compatibility. All variants are active products with ROHS3 compliance. Selection requires system-level verification that 3V supply voltage operation is compatible with existing power distribution and signal integrity requirements.

All substitute parts maintain the -40°C ~ 85°C operating temperature range and 8-SOIC surface mount package specification of the original SP490EEN-L.

Frequently Asked Questions (FAQ)

Q: Can ADM1490EBRZ directly replace SP490EEN-L in existing designs?

A: Yes, within the 4.75V ~ 5.25V supply voltage range. Both parts share identical protocol (RS422/RS485), driver/receiver configuration (1/1), duplex mode (full), package type (8-SOIC), and operating temperature range (-40°C ~ 85°C). The ADM1490EBRZ provides enhanced data rate performance (16 Mbps vs. 10 Mbps) and is an active product with current manufacturing support.

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, while ADM1490EBRZ-REEL7 is supplied in tape & reel format. Selection depends on assembly line requirements and procurement preferences.

Q: Can I use ISL83490IBZ or ADM3490ARZ as replacements for SP490EEN-L?

A: These parts are functionally compatible but operate at 3V ~ 3.6V supply voltage, not the original 4.75V ~ 5.25V range. Use only if your system power supply can be modified to 3V operation or if a separate 3V rail is available for this component. Verify signal integrity and power distribution compatibility before implementation.

Q: Why does ISL8490EIBZ have a different supply voltage range (4.5V ~ 5.5V) than SP490EEN-L (4.75V ~ 5.25V)?

A: ISL8490EIBZ provides a broader supply voltage operating window. The 4.5V lower limit and 5.5V upper limit encompass the original SP490EEN-L range while offering additional operational margin. This wider tolerance can improve system robustness in applications with variable power supply conditions.

Q: Are all substitute parts RoHS compliant?

A: All Analog Devices and Renesas substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the significance of receiver hysteresis differences between parts?

A: Receiver hysteresis affects noise immunity and signal transition characteristics. SP490EEN-L specifies 70 mV hysteresis. ADM1490EBRZ provides 30 mV (lower hysteresis, faster transitions), while ADM3490 and ISL83490 series provide 50 mV. ISL8490EIBZ matches the original 70 mV specification. Hysteresis differences may affect performance in noisy environments; verify compatibility with your signal integrity requirements.

Q: Can I mix packaging formats (tube vs. tape & reel) in the same design?

A: Yes. Tube and tape & reel variants of the same part number are electrically and functionally identical. Mixing formats is acceptable if your assembly process can accommodate both packaging types. Coordinate with procurement and manufacturing to ensure supply chain consistency.

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