SP1491EEN-L Equivalent & Substitute Parts

Part Overview

The SP1491EEN-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 and substitute parts necessary for ongoing system support and new design implementations. The part operates across the industrial temperature range of -40°C to 85°C with a 20 Mbps data rate capability and 4.75V to 5.25V supply voltage specifications.

Key Parameters

Parameter	SP1491EEN-L
Manufacturer	MaxLinear, Inc.
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	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	2 (1 Year)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the SP1491EEN-L is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS422/RS485 full-duplex operation
Number of Drivers/Receivers: 1/1 configuration
Receiver Hysteresis: 70 mV
Package / Case: 14-SOIC form factor
Mounting Type: Surface Mount

Secondary Compatibility Criteria:

Voltage - Supply: 4.75V ~ 5.25V (or compatible range)
Operating Temperature: -40°C ~ 85°C (or compatible range)

Substitute parts are grouped into two categories based on manufacturer and product status:

Category 1: Renesas Electronics Corporation (Active Status) ISL8491EIBZ and ISL8491EIBZ-T meet all primary compatibility criteria with identical receiver hysteresis, protocol support, and package specifications. These parts operate at 10 Mbps data rate with expanded supply voltage tolerance (4.5V ~ 5.5V) and maintain full operating temperature range compatibility.

Category 2: Analog Devices Inc./Maxim Integrated (Active Status) LTC491 series (LTC491CS#PBF, LTC491CS#TRPBF, LTC491IS#PBF, LTC491IS#TRPBF) and MAX491 series (MAX491CSD+, MAX491CSD+T, MAX491ECSD+, MAX491ECSD+T) provide full functional equivalence with identical receiver hysteresis and protocol support. These parts are available in multiple packaging options and temperature grades, with MAX491 variants offering 2.5 Mbps data rate and LTC491 variants offering industrial temperature range coverage.

Parameter Comparison

Parameter	SP1491EEN-L	ISL8491EIBZ / ISL8491EIBZ-T	LTC491CS#PBF / LTC491CS#TRPBF	LTC491IS#PBF / LTC491IS#TRPBF	MAX491CSD+ / MAX491CSD+T	MAX491ECSD+ / MAX491ECSD+T
Manufacturer	MaxLinear, Inc.	Renesas Electronics	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim
Product Status	Obsolete	Active	Active	Active	Active	Active
Protocol	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485	RS422, RS485
Number of Drivers/Receivers	1/1	1/1	1/1	1/1	1/1	1/1
Duplex	Full	Full	Full	Full	Full	Full
Receiver Hysteresis	70 mV	70 mV	70 mV	70 mV	70 mV	70 mV
Data Rate	20 Mbps	10 Mbps	Not specified	Not specified	2.5 Mbps	2.5 Mbps
Voltage - Supply	4.75V ~ 5.25V	4.5V ~ 5.5V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Industrial Temperature Range Applications (-40°C to 85°C): Select LTC491IS#PBF, LTC491IS#TRPBF, ISL8491EIBZ, or ISL8491EIBZ-T. These parts maintain full operating temperature specifications matching the SP1491EEN-L. LTC491IS variants offer unlimited moisture sensitivity with ROHS3 compliance. ISL8491 variants provide expanded supply voltage tolerance (4.5V ~ 5.5V) with ROHS3 and REACH compliance.

For Commercial Temperature Range Applications (0°C to 70°C): MAX491ECSD+, MAX491ECSD+T, MAX491CSD+, MAX491CSD+T, LTC491CS#PBF, and LTC491CS#TRPBF are suitable. These parts are all active products with ROHS3 compliance and unlimited moisture sensitivity (LTC491 series) or unlimited MSL (MAX491 series).

For New Designs Requiring Long-Term Support: Prioritize active-status parts from established manufacturers. ISL8491EIBZ and ISL8491EIBZ-T from Renesas Electronics or LTC491IS series from Analog Devices Inc. provide the strongest long-term availability and support profiles.

For Supply Chain Flexibility: MAX491 series offers the highest inventory availability across multiple packaging options (tube and cut tape & Digi-Reel). LTC491 series provides equivalent functionality with superior moisture sensitivity ratings.

Frequently Asked Questions (FAQ)

Q: Can ISL8491EIBZ replace SP1491EEN-L in all applications? A: ISL8491EIBZ meets all primary compatibility criteria (protocol, driver/receiver count, hysteresis, package, and temperature range). The 10 Mbps data rate is lower than the SP1491EEN-L's 20 Mbps specification. Verify that your application's actual data rate requirements do not exceed 10 Mbps before substitution.

Q: What is the difference between LTC491CS and LTC491IS variants? A: LTC491CS operates across 0°C to 70°C commercial temperature range, while LTC491IS covers -40°C to 85°C industrial temperature range. Both share identical electrical specifications, receiver hysteresis, and unlimited moisture sensitivity. Select LTC491IS for applications requiring full industrial temperature coverage.

Q: Are MAX491 and LTC491 parts pin-compatible with SP1491EEN-L? A: Both MAX491 and LTC491 series are housed in 14-SOIC packages with identical pinouts for RS422/RS485 transceiver functionality. Pin compatibility is confirmed for direct substitution in 14-SOIC footprints.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in tube packaging and cut tape & Digi-Reel (CT) formats. ISL8491EIBZ is supplied in tube; ISL8491EIBZ-T in cut tape & Digi-Reel. LTC491 and MAX491 series offer both packaging options with part number suffixes indicating packaging type (#PBF for tube, #TRPBF or +T for tape & reel).

Q: Do all substitute parts meet RoHS and REACH compliance? A: All active substitute parts listed are ROHS3 compliant. ISL8491 variants are REACH Unaffected. LTC491 and MAX491 series are ROHS3 compliant and REACH Unaffected. The original SP1491EEN-L compliance status is not specified in available documentation.

Q: Which substitute offers the best moisture sensitivity rating? A: LTC491 series (both CS and IS variants) and MAX491 series offer MSL 1 (Unlimited), providing superior moisture sensitivity compared to SP1491EEN-L (MSL 2, 1 Year) and ISL8491 variants (MSL 3, 168 Hours).

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message