SP490CS-L Equivalent & Substitute Parts

Part Overview

The SP490CS-L is a 1/1 full-duplex RS422/RS485 transceiver IC manufactured by MaxLinear, Inc., housed in an 8-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring compatible RS422/RS485 interface functionality.

Key Parameters

Parameter	SP490CS-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	0°C ~ 70°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Supplier Device Package	8-PDIP
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SP490CS-L is determined by strict equivalence across the following parameters:

Protocol: RS422/RS485 full-duplex operation
Package: 8-DIP (0.300", 7.62mm) through-hole mounting
Electrical interface: 1/1 driver/receiver configuration
Supply voltage: 4.75V ~ 5.25V
Receiver hysteresis: 70 mV (preferred for signal integrity matching)
Operating temperature range: 0°C ~ 70°C (standard commercial grade)
Mounting type: Through-hole DIP

Substitute parts are grouped into two categories:

Category A: Direct Functional Equivalents (70 mV Hysteresis, 0°C ~ 70°C) These parts maintain identical receiver hysteresis and operating temperature specifications as the SP490CS-L.

Category B: Extended Temperature Variants (-40°C ~ 85°C) These parts provide expanded operating temperature range while maintaining all other electrical parameters, suitable for applications requiring industrial-grade temperature performance.

Category C: Alternative Hysteresis (50 mV) The SN75179BP operates with 50 mV receiver hysteresis, representing a tighter threshold specification that may affect noise margin characteristics in specific applications.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temperature	Package	Product Status
SP490CS-L	MaxLinear, Inc.	RS422, RS485	1/1	Full	70 mV	5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Obsolete
SN75179BP	Texas Instruments	RS422, RS485	1/1	Full	50 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
LTC490CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
LTC490IN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active
MAX488CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
MAX488EPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active
MAX490CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
MAX490ECPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active
MAX490EEPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active
MAX490EPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active

Engineering Selection Recommendations

For Direct Replacement (Commercial Temperature, 0°C ~ 70°C):

LTC490CN8#PBF and MAX490CPA+ or MAX490ECPA+ are primary candidates. All three maintain 70 mV receiver hysteresis matching the SP490CS-L specification. LTC490CN8#PBF is manufactured by Analog Devices Inc. and carries ROHS3 compliance. MAX490CPA+ and MAX490ECPA+ are functionally identical variants from Analog Devices Inc./Maxim Integrated, both ROHS3 compliant with MSL 1 rating.

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

LTC490IN8#PBF, MAX488EPA+, MAX490EEPA+, and MAX490EPA+ provide industrial-grade temperature performance. LTC490IN8#PBF and MAX490EPA+ maintain the 70 mV hysteresis specification. All variants are ROHS3 compliant and REACH unaffected.

For Alternative Specifications:

SN75179BP (Texas Instruments) operates with 50 mV receiver hysteresis and commercial temperature range. This part is ROHS3 compliant but represents a different hysteresis specification that may alter signal detection thresholds in noise-sensitive applications.

MAX488CPA+ and MAX488EPA+ feature lower data rate specification (250 kbps) compared to the SP490CS-L (5 Mbps), suitable for lower-speed RS422/RS485 applications.

All substitute parts are housed in 8-DIP through-hole packages with identical pinout compatibility and 4.75V ~ 5.25V supply voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can SN75179BP replace SP490CS-L directly?

A: SN75179BP is functionally compatible for RS422/RS485 applications but operates with 50 mV receiver hysteresis versus the SP490CS-L's 70 mV specification. This tighter threshold may affect noise margin performance in electrically noisy environments. Electrical characterization is required for noise-sensitive applications.

Q: What is the difference between MAX490CPA+, MAX490ECPA+, and MAX490EPA+?

A: MAX490CPA+ and MAX490ECPA+ operate across 0°C ~ 70°C commercial temperature range. MAX490EPA+ extends operation to -40°C ~ 85°C industrial temperature range. All three maintain identical 70 mV receiver hysteresis, 2.5 Mbps data rate, and 8-DIP package specifications. Selection depends on application temperature requirements.

Q: Are all substitute parts pin-compatible with SP490CS-L?

A: Yes. All substitute parts are housed in 8-DIP (0.300", 7.62mm) through-hole packages with identical pinout configuration, enabling direct socket replacement without PCB modification.

Q: What is the significance of receiver hysteresis specification?

A: Receiver hysteresis determines the voltage differential required for signal state transitions. The SP490CS-L specifies 70 mV hysteresis. Substitute parts with matching 70 mV hysteresis (LTC490CN8#PBF, MAX490 series) maintain equivalent noise immunity. SN75179BP's 50 mV hysteresis provides tighter threshold detection but reduced noise margin.

Q: Which substitute part offers the best inventory availability?

A: MAX490EPA+ maintains the highest inventory level (15,100 pcs) with active product status, extended temperature range (-40°C ~ 85°C), and full compliance certifications (ROHS3, REACH unaffected).

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts carry ROHS3 compliance certification. The SP490CS-L (obsolete) does not specify RoHS status.

Q: What is MSL (Moisture Sensitivity Level) and why does it matter?

A: MSL 1 (Unlimited) indicates the component requires no special moisture control during storage and handling. All substitute parts carry MSL 1 rating, matching the SP490CS-L specification and eliminating moisture-related reliability concerns.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message