SP491ES-L Equivalent & Substitute Parts

Part Overview

The SP491ES-L is a full-duplex RS422/RS485 transceiver IC manufactured by MaxLinear, Inc., housed in a 14-pin DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing system support. The SP491ES-L provides 1/1 driver/receiver configuration with 70 mV receiver hysteresis and operates at 5 Mbps data rate across a 4.75V to 5.25V supply voltage range. Substitution is required to maintain design continuity and ensure component availability for production and maintenance applications.

Key Parameters

Parameter	SP491ES-L
Manufacturer	MaxLinear, Inc.
Product Status	Obsolete
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	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)
Supplier Device Package	14-PDIP
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SP491ES-L is determined by strict equivalence across the following critical parameters:

Protocol Compatibility: RS422/RS485 full-duplex operation
Electrical Configuration: 1/1 driver/receiver topology
Receiver Hysteresis: 70 mV specification
Supply Voltage Range: 4.75V ~ 5.25V
Package Type: 14-DIP (0.300", 7.62mm) through-hole mounting
Moisture Sensitivity: MSL 1 (Unlimited)

All substitute parts listed maintain these core parameters. Variations in operating temperature range and data rate specifications are noted but do not preclude substitution when the application requirements fall within the substitute part's rated specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Protocol	Drivers/Receivers	Receiver Hysteresis	Voltage - Supply	Operating Temperature	Package / Case	Data Rate
SP491ES-L	MaxLinear, Inc.	Obsolete	RS422, RS485	1/1	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	14-DIP (0.300", 7.62mm)	5 Mbps
LTC491CN#PBF	Analog Devices Inc.	Active	RS422, RS485	1/1	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-DIP (0.300", 7.62mm)	—
LTC491IN#PBF	Analog Devices Inc.	Active	RS422, RS485	1/1	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	14-DIP (0.300", 7.62mm)	—
MAX491CPD+	Analog Devices Inc./Maxim Integrated	Active	RS422, RS485	1/1	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-DIP (0.300", 7.62mm)	2.5 Mbps
MAX491ECPD+	Analog Devices Inc./Maxim Integrated	Active	RS422, RS485	1/1	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	14-DIP (0.300", 7.62mm)	2.5 Mbps
MAX491EEPD+	Analog Devices Inc./Maxim Integrated	Active	RS422, RS485	1/1	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	14-DIP (0.300", 7.62mm)	2.5 Mbps
MAX491EPD+	Analog Devices Inc./Maxim Integrated	Active	RS422, RS485	1/1	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	14-DIP (0.300", 7.62mm)	2.5 Mbps

Engineering Selection Recommendations

For Extended Temperature Range Applications (-40°C to 85°C):

LTC491IN#PBF, MAX491EEPD+, and MAX491EPD+ maintain the full operating temperature range of the original SP491ES-L. These parts are recommended when thermal extremes are present in the application environment. All three are active products with current manufacturing status and full RoHS3 compliance.

For Standard Industrial Temperature Range (0°C to 70°C):

LTC491CN#PBF and MAX491CPD+ are suitable for applications operating within standard industrial temperature limits. Both are active products with established supply chains and RoHS3 compliance.

For New Designs:

All substitute parts listed carry active product status from Analog Devices Inc. or Maxim Integrated, ensuring long-term availability and support. Selection should prioritize parts matching the application's operating temperature requirements and data rate specifications.

Frequently Asked Questions (FAQ)

Q: Can MAX491CPD+ replace SP491ES-L in all applications?

A: MAX491CPD+ is electrically equivalent for RS422/RS485 full-duplex operation with matching 1/1 driver/receiver configuration, 70 mV hysteresis, and 14-DIP package. However, its operating temperature range is limited to 0°C to 70°C, compared to SP491ES-L's -40°C to 85°C. Substitution is valid only when the application operates within the MAX491CPD+ temperature specification. Data rate is specified at 2.5 Mbps versus SP491ES-L's 5 Mbps; verify that application bandwidth requirements do not exceed this limit.

Q: What is the difference between LTC491CN#PBF and LTC491IN#PBF?

A: Both parts are manufactured by Analog Devices Inc. and share identical electrical specifications for RS422/RS485 transceiver operation. The primary difference is operating temperature range: LTC491CN#PBF operates from 0°C to 70°C, while LTC491IN#PBF operates from -40°C to 85°C, matching the original SP491ES-L specification. Select based on application temperature requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed (LTC491CN#PBF, LTC491IN#PBF, MAX491CPD+, MAX491ECPD+, MAX491EEPD+, MAX491EPD+) carry RoHS3 compliance certification. The original SP491ES-L, being obsolete, does not carry this certification.

Q: Can I use MAX491EEPD+ and MAX491EPD+ interchangeably?

A: Both parts share identical electrical specifications, operating temperature range (-40°C to 85°C), and 14-DIP package. They are functionally interchangeable. Verify part availability and lead times with your supplier before committing to either part number.

Q: Does the 14-DIP package remain the same across all substitutes?

A: Yes. All substitute parts maintain the 14-DIP (0.300", 7.62mm) through-hole package specification, ensuring direct mechanical and electrical compatibility with existing PCB layouts designed for SP491ES-L.

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