SP1491ECN-L Equivalent & Substitute Parts

Part Overview

The SP1491ECN-L is a 1/1 full-duplex RS422/RS485 transceiver IC manufactured by MaxLinear, Inc., housed in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The part operates within a 4.75V to 5.25V supply voltage range with a 70 mV receiver hysteresis specification and supports data rates up to 20 Mbps across a 0°C to 70°C operating temperature range.

Key Parameters

Parameter	SP1491ECN-L
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	70 mV
Data Rate	20 Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the SP1491ECN-L is determined by the following critical parameters:

Protocol Compatibility: RS422/RS485 full-duplex transceiver functionality
Driver/Receiver Configuration: 1/1 architecture
Package Compatibility: 14-SOIC form factor (0.154", 3.90mm width)
Receiver Hysteresis: 70 mV specification
Supply Voltage Range: Minimum 4.75V to 5.25V nominal operation
Mounting Type: Surface mount technology

Substitute parts are grouped into two categories based on operational temperature range and data rate specifications:

Category A - Extended Temperature Range (Active Status): ISL8491EIBZ and ISL8491EIBZ-T from Renesas Electronics Corporation operate across -40°C to 85°C with expanded supply voltage tolerance (4.5V ~ 5.5V). These parts support 10 Mbps data rates and maintain ROHS3 compliance.

Category B - Standard Temperature Range (Active Status): LTC491 series (LTC491CS#PBF, LTC491CS#TRPBF, LTC491IS#PBF, LTC491IS#TRPBF) from Analog Devices Inc. and MAX491 series (MAX491CSD+, MAX491CSD+T, MAX491ECSD+, MAX491ECSD+T) from Analog Devices Inc./Maxim Integrated maintain the original 0°C to 70°C operating window with 4.75V to 5.25V supply specifications. MAX491 variants specify 2.5 Mbps data rates.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Voltage - Supply	Operating Temperature	Package	Product Status	Packaging Option
SP1491ECN-L	MaxLinear, Inc.	RS422, RS485	1/1	Full	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Obsolete	-
ISL8491EIBZ	Renesas Electronics	RS422, RS485	1/1	Full	70 mV	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active	Tube
ISL8491EIBZ-T	Renesas Electronics	RS422, RS485	1/1	Full	70 mV	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active	Cut Tape & Digi-Reel
LTC491CS#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	Tube
LTC491CS#TRPBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	Tape & Reel
LTC491IS#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active	Tube
LTC491IS#TRPBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active	Tape & Reel
MAX491CSD+	Analog Devices Inc./Maxim	RS422, RS485	1/1	Full	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	Tube
MAX491CSD+T	Analog Devices Inc./Maxim	RS422, RS485	1/1	Full	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	Cut Tape & Digi-Reel
MAX491ECSD+	Analog Devices Inc./Maxim	RS422, RS485	1/1	Full	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	Tube
MAX491ECSD+T	Analog Devices Inc./Maxim	RS422, RS485	1/1	Full	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	Cut Tape & Digi-Reel

Engineering Selection Recommendations

All listed substitute parts maintain active product status with current manufacturer support and availability. Selection between substitute options depends on application-specific requirements:

For applications requiring extended temperature operation (-40°C to 85°C): ISL8491EIBZ series from Renesas Electronics Corporation or LTC491I series from Analog Devices Inc. provide expanded thermal range coverage. ISL8491EIBZ variants also offer increased supply voltage tolerance (4.5V ~ 5.5V).

For applications maintaining original temperature specifications (0°C to 70°C): LTC491C series and MAX491 series provide direct functional equivalence with identical supply voltage ranges (4.75V ~ 5.25V). MAX491 variants are available in higher inventory quantities.

For packaging requirements: Tube packaging is available across all substitute families. Cut Tape & Digi-Reel and Tape & Reel options are available for high-volume production requirements.

All substitute parts listed carry ROHS3 compliance certification and maintain REACH unaffected status, ensuring regulatory alignment with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can ISL8491EIBZ be used as a direct replacement for SP1491ECN-L in existing designs?

A: ISL8491EIBZ maintains functional equivalence across all critical parameters: RS422/RS485 protocol, 1/1 driver/receiver configuration, full-duplex operation, 70 mV receiver hysteresis, and 14-SOIC package form factor. The extended operating temperature range (-40°C to 85°C) and expanded supply voltage tolerance (4.5V ~ 5.5V) provide additional operational margin. Pin-level compatibility is maintained.

Q: What is the difference between LTC491C and LTC491I variants?

A: Both LTC491C and LTC491I series maintain identical electrical specifications and 14-SOIC packaging. The primary distinction is operating temperature range: LTC491C operates across 0°C to 70°C, while LTC491I extends to -40°C to 85°C. Supply voltage specifications remain 4.75V to 5.25V for both variants.

Q: Are MAX491 parts suitable for high-speed RS485 applications?

A: MAX491 series specifies 2.5 Mbps data rate capability, which is lower than the original SP1491ECN-L specification of 20 Mbps. For applications requiring data rates exceeding 2.5 Mbps, ISL8491EIBZ (10 Mbps) or LTC491 series should be evaluated based on specific bandwidth requirements.

Q: What packaging options are available for production quantities?

A: Tube packaging is standard across all substitute families for smaller quantities. Cut Tape & Digi-Reel packaging is available for ISL8491EIBZ-T, MAX491CSD+T, and MAX491ECSD+T. Tape & Reel packaging is available for LTC491CS#TRPBF and LTC491IS#TRPBF variants, supporting automated assembly processes.

Q: Do all substitute parts meet current RoHS compliance requirements?

A: All listed substitute parts carry ROHS3 compliance certification. The original SP1491ECN-L is classified as obsolete and does not carry current compliance certifications. Transition to any active substitute part ensures alignment with current environmental and regulatory standards.

Q: Can substitute parts be mixed within a single production run?

A: All substitute parts maintain identical 14-SOIC package dimensions (0.154", 3.90mm width) and pin-level compatibility. However, component sourcing should follow established supply chain protocols to maintain traceability and quality documentation for production batches.

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