SP491CS-L RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The SP491CS-L is a full-duplex RS422/RS485 transceiver IC in 14-DIP packaging manufactured by MaxLinear, Inc. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The SP491CS-L provides 1/1 driver/receiver configuration with 70 mV receiver hysteresis and operates at 5 Mbps data rate within a 4.75V to 5.25V supply voltage range. Active equivalent parts from Analog Devices Inc. and Maxim Integrated maintain functional compatibility while offering extended availability and product lifecycle support.

Key Parameters

Parameter	SP491CS-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	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SP491CS-L is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Protocol: RS422/RS485
Number of Drivers/Receivers: 1/1 configuration
Duplex: Full-duplex operation
Receiver Hysteresis: 70 mV
Voltage Supply Range: 4.75V ~ 5.25V
Package / Case: 14-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variations:

Data Rate: Substitute parts may operate at equal or higher data rates (SP491CS-L operates at 5 Mbps; substitutes at 2.5 Mbps are acceptable as they maintain full compatibility within the original operating envelope)
Operating Temperature Range: Substitutes with extended temperature ranges (-40°C ~ 85°C) are compatible with applications requiring the original 0°C ~ 70°C range
Product Status: Active substitutes replace obsolete parts
Manufacturer: Analog Devices Inc. and Maxim Integrated substitutes maintain full electrical and mechanical compatibility

All substitute parts listed meet these criteria and are direct functional replacements for the SP491CS-L.

Parameter Comparison

Parameter	SP491CS-L	LTC491CN#PBF	LTC491IN#PBF	MAX491CPD+	MAX491ECPD+	MAX491EEPD+	MAX491EPD+
Manufacturer	MaxLinear, Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Protocol	RS422, RS485	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	1/1
Duplex	Full	Full	Full	Full	Full	Full	Full
Receiver Hysteresis	70 mV	70 mV	70 mV	70 mV	70 mV	70 mV	70 mV
Data Rate	5 Mbps	—	—	2.5 Mbps	2.5 Mbps	2.5 Mbps	2.5 Mbps
Voltage - Supply	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	—	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Recommendation: MAX491EPD+

The MAX491EPD+ is the preferred substitute for the SP491CS-L. This part is manufactured by Analog Devices Inc./Maxim Integrated with Active product status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance and REACH Unaffected certification, meeting modern regulatory requirements. The extended operating temperature range of -40°C to 85°C provides thermal margin beyond the original 0°C to 70°C specification, supporting applications across broader environmental conditions.

Secondary Recommendation: MAX491EEPD+

The MAX491EEPD+ offers identical electrical and mechanical specifications to MAX491EPD+ with equivalent regulatory compliance. This part is suitable for applications requiring the extended temperature range and represents an alternative source for supply chain redundancy.

Temperature-Constrained Applications: MAX491CPD+ or MAX491ECPD+

For applications operating strictly within the 0°C to 70°C range, MAX491CPD+ and MAX491ECPD+ provide cost-optimized alternatives with standard industrial temperature specifications. Both maintain full electrical compatibility and regulatory compliance.

Analog Devices LTC491 Series: LTC491CN#PBF and LTC491IN#PBF

The LTC491CN#PBF operates within the original 0°C to 70°C temperature range and is suitable for direct replacement in standard industrial applications. The LTC491IN#PBF extends the operating range to -40°C to 85°C, providing thermal flexibility equivalent to the MAX491EEPD+ and MAX491EPD+ options. Both LTC491 variants are ROHS3 compliant and REACH Unaffected.

All substitute parts are electrically and mechanically interchangeable with the SP491CS-L within their specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a lower data rate specification than the SP491CS-L?

A: Yes. The SP491CS-L operates at 5 Mbps, while most substitute parts (MAX491 series) are rated at 2.5 Mbps. A lower data rate specification does not prevent operation at lower speeds. All substitute parts maintain full RS422/RS485 protocol compliance and are suitable for applications operating at or below their rated data rates.

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

A: Both parts are functionally identical RS422/RS485 transceivers with 1/1 driver/receiver configuration. 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. Select based on your application's thermal requirements.

Q: Are all substitute parts pin-compatible with the SP491CS-L?

A: Yes. All substitute parts use the 14-DIP (0.300", 7.62mm) package with identical through-hole mounting. Pin-to-pin compatibility is guaranteed for direct socket replacement.

Q: Do substitute parts meet current regulatory standards?

A: Yes. All substitute parts listed carry ROHS3 compliance and REACH Unaffected certification, meeting current environmental and regulatory requirements. The SP491CS-L does not specify these certifications.

Q: Which substitute part should I select for new designs?

A: For new designs, MAX491EPD+ or MAX491EEPD+ are recommended. Both offer extended operating temperature ranges (-40°C to 85°C), active product status with long-term availability, and full regulatory compliance. These parts provide the best balance of performance, reliability, and supply chain stability.

Q: Can I mix different substitute parts in the same system?

A: Yes. All substitute parts maintain identical electrical specifications for RS422/RS485 protocol operation, receiver hysteresis, supply voltage, and package form factor. They are functionally interchangeable and can be used together in multi-transceiver systems.

Q: What is the inventory status of substitute parts?

A: All substitute parts listed are in active production with substantial inventory availability: LTC491CN#PBF (2200 pcs), LTC491IN#PBF (2200 pcs), MAX491CPD+ (2020 pcs), MAX491ECPD+ (2500 pcs), MAX491EEPD+ (2100 pcs), and MAX491EPD+ (2900 pcs).

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