SP491EN-L Equivalent & Substitute Parts

Part Overview

The SP491EN-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 designs. The SP491EN-L operates within a 4.75V to 5.25V supply range with a 5Mbps data rate capability and supports industrial temperature ranges from -40°C to 85°C.

Key Parameters

Parameter	SP491EN-L
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	70 mV
Data Rate	5 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 SP491EN-L is determined by the following critical parameters:

Protocol compatibility: RS422/RS485 full-duplex operation
Electrical interface: 1/1 driver/receiver configuration
Receiver hysteresis: 70 mV
Package type: 14-SOIC surface mount
Supply voltage range: Minimum 4.75V to 5.25V operation
Operating temperature range: -40°C to 85°C support
Data rate capability: Minimum 5 Mbps or unspecified

Substitute parts must maintain compatibility across these parameters. Parts with wider supply voltage ranges (4.5V ~ 5.5V) remain compatible with the SP491EN-L's 4.75V ~ 5.25V requirement. Parts with higher data rate specifications exceed the original performance envelope and provide enhanced capability. Active product status substitutes ensure long-term availability and manufacturing support.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Hysteresis	Data Rate	Supply Voltage	Temp Range	Package	Status
SP491EN-L	MaxLinear, Inc.	RS422, RS485	1/1	Full	70 mV	5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Obsolete
ADM489ARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active
ISL8491EIBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Full	70 mV	10 Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active
ISL8491EIBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	Full	70 mV	10 Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active
LTC491CS#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active
LTC491CS#TRPBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active
LTC491IS#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active
LTC491IS#TRPBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active
MAX491CSD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active
MAX491CSD+T	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active
MAX491ECSD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active

Engineering Selection Recommendations

For direct replacement of the obsolete SP491EN-L, the LTC491IS#PBF and LTC491IS#TRPBF variants from Analog Devices Inc. provide the closest electrical and thermal match. Both maintain the identical supply voltage range (4.75V ~ 5.25V), full operating temperature span (-40°C ~ 85°C), and 70 mV receiver hysteresis. These parts carry ROHS3 compliance and unlimited moisture sensitivity rating, supporting long-term production environments.

The ISL8491EIBZ and ISL8491EIBZ-T from Renesas Electronics Corporation offer enhanced data rate performance (10 Mbps) with a slightly wider supply voltage tolerance (4.5V ~ 5.5V). Both maintain the -40°C ~ 85°C temperature range and ROHS3 compliance, making them suitable for applications requiring higher bandwidth capability.

For applications with relaxed temperature requirements (0°C ~ 70°C), the MAX491CSD+, MAX491CSD+T, and MAX491ECSD+ variants provide active product status with ROHS3 compliance. These parts operate at 2.5 Mbps and maintain the original 4.75V ~ 5.25V supply specification.

The ADM489ARZ-REEL7 operates at a reduced data rate (250 kbps) with a wider supply voltage range (4.5V ~ 5.5V) and maintains full temperature coverage (-40°C ~ 85°C). This part is suitable for lower-speed RS422/RS485 applications requiring extended supply voltage tolerance.

Frequently Asked Questions (FAQ)

Q: Can the LTC491IS#PBF directly replace the SP491EN-L in existing designs?

A: Yes. The LTC491IS#PBF maintains identical electrical specifications including supply voltage (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), receiver hysteresis (70 mV), and 14-SOIC package geometry. Both are 1/1 full-duplex RS422/RS485 transceivers with surface mount configuration.

Q: What is the difference between ISL8491EIBZ and ISL8491EIBZ-T?

A: Both parts are electrically identical with 10 Mbps data rate capability and -40°C ~ 85°C temperature range. The primary difference is packaging: ISL8491EIBZ is supplied in Tube packaging, while ISL8491EIBZ-T is supplied in Cut Tape (CT) & Digi-Reel format for automated assembly processes.

Q: Why do some substitute parts have lower data rates than the SP491EN-L?

A: The ADM489ARZ-REEL7 operates at 250 kbps, which is lower than the SP491EN-L's 5 Mbps specification. This part remains functionally compatible for RS422/RS485 protocol operation but is suitable only for applications not requiring the higher bandwidth. Verify application data rate requirements before selection.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed carry ROHS3 compliance certification. The original SP491EN-L is obsolete and does not carry RoHS certification. Compliance status is documented in the parameter comparison table.

Q: What packaging options are available for the LTC491 series?

A: The LTC491 base product is available in four variants: LTC491CS#PBF (Tube, 0°C ~ 70°C), LTC491CS#TRPBF (Tape & Reel, 0°C ~ 70°C), LTC491IS#PBF (Tube, -40°C ~ 85°C), and LTC491IS#TRPBF (Tape & Reel, -40°C ~ 85°C). Select based on temperature requirements and assembly process compatibility.

Q: Can I use MAX491CSD+ in applications requiring -40°C operation?

A: No. The MAX491CSD+, MAX491CSD+T, and MAX491ECSD+ variants are rated for 0°C ~ 70°C operation only. For full industrial temperature range (-40°C ~ 85°C), select LTC491IS#PBF, LTC491IS#TRPBF, ISL8491EIBZ, ISL8491EIBZ-T, or ADM489ARZ-REEL7.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message