SP490ES-L Equivalent & Substitute Parts

Part Overview

The SP490ES-L is a 1/1 full-duplex RS422/RS485 transceiver IC in 8-DIP packaging manufactured by MaxLinear, Inc. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The SP490ES-L operates at 5V supply voltage with a 5 Mbps data rate and 70 mV receiver hysteresis, designed for industrial serial communication applications requiring full-duplex RS422 or RS485 protocol support.

Key Parameters

Parameter	SP490ES-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	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 SP490ES-L is determined by strict alignment of the following critical parameters:

Primary Compatibility Criteria:

Protocol: RS422/RS485 full-duplex 1/1 transceiver configuration
Package: 8-DIP (0.300", 7.62mm) through-hole mounting
Receiver Hysteresis: 70 mV (matching the original specification)
Voltage Supply Range: 4.75V ~ 5.25V (5V operation)
Operating Temperature: -40°C ~ 85°C (extended industrial range)
Moisture Sensitivity Level: 1 (Unlimited)

Substitute Categories:

Category A - Direct Functional Equivalents (5V Supply, 70 mV Hysteresis, Extended Temperature): These parts maintain identical electrical specifications and operating conditions to the SP490ES-L.

Category B - Active Alternatives (5V Supply, 70 mV Hysteresis, Limited Temperature): These parts operate at 5V with matching hysteresis but restricted to 0°C ~ 70°C operating temperature range.

Category C - Enhanced Performance Variants (3V Supply, 50 mV Hysteresis, Extended Temperature): These parts offer higher data rates and lower supply voltage operation but require circuit redesign for voltage compatibility.

Category D - Reduced Data Rate Alternatives (5V Supply, 70 mV Hysteresis, Extended Temperature): These parts maintain 5V operation and extended temperature range but operate at lower data rates.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Hysteresis (mV)	Data Rate	Supply Voltage	Operating Temp	Package	Product Status	Inventory
SP490ES-L	MaxLinear, Inc.	RS422, RS485	1/1	70	5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Obsolete	3900 Pcs
MAX488EPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	70	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active	5400 Pcs
MAX490CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	70	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active	4660 Pcs
MAX488CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	70	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active	5300 Pcs
LTC490IN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	70	—	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Active	3700 Pcs
LTC490CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	70	—	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active	2112 Pcs
ADM488ANZ	Analog Devices Inc.	RS422, RS485	1/1	70	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Active	755 Pcs
MAX3490EPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	50	10 Mbps	3V ~ 3.6V	-40°C ~ 85°C	8-DIP	Active	5200 Pcs
MAX3490EEPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	50	10 Mbps	3V ~ 3.6V	-40°C ~ 85°C	8-DIP	Active	3600 Pcs
MAX3490CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	50	10 Mbps	3V ~ 3.6V	0°C ~ 70°C	8-DIP	Active	2000 Pcs
MAX490ECPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	70	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Active	3600 Pcs

Engineering Selection Recommendations

For Direct Replacement (No Circuit Modification Required):

LTC490IN8#PBF is the primary direct substitute. It maintains the SP490ES-L's 5V supply voltage range (4.75V ~ 5.25V), 70 mV receiver hysteresis, extended operating temperature range (-40°C ~ 85°C), and 8-DIP package. This part is ROHS3 compliant and REACH unaffected, with 3700 units in stock. The LTC490 series is manufactured by Analog Devices Inc., an established supplier with active product status.

For Extended Temperature Applications:

MAX488EPA+ provides full compatibility with the SP490ES-L's electrical specifications: 5V supply, 70 mV hysteresis, and -40°C ~ 85°C operating range. Although data rate is reduced to 250 kbps, this part is suitable for applications where the original 5 Mbps specification exceeds system requirements. ROHS3 compliant with 5400 units available.

ADM488ANZ offers similar electrical performance with slightly wider supply voltage tolerance (4.5V ~ 5.5V), maintaining 70 mV hysteresis and -40°C ~ 85°C operation. This part is ROHS3 compliant and REACH unaffected, with 755 units in stock.

For Commercial Temperature Range Applications:

MAX488CPA+ and MAX490CPA+ are suitable for systems operating within 0°C ~ 70°C. Both maintain 5V supply voltage and 70 mV hysteresis specifications. MAX488CPA+ operates at 250 kbps, while MAX490CPA+ supports 2.5 Mbps. Both are ROHS3 compliant with high inventory availability (5300 and 4660 units respectively).

For Low-Voltage System Integration:

MAX3490EPA+ and MAX3490EEPA+ operate at 3V ~ 3.6V supply voltage with enhanced 10 Mbps data rate capability. These parts require circuit redesign for voltage compatibility but offer superior performance for low-power applications. Both maintain extended temperature operation (-40°C ~ 85°C) and are ROHS3 compliant. MAX3490EPA+ has 5200 units in stock; MAX3490EEPA+ has 3600 units.

Frequently Asked Questions (FAQ)

Q: Can MAX3490EPA+ directly replace SP490ES-L without circuit modification?

A: No. MAX3490EPA+ operates at 3V ~ 3.6V supply voltage, while SP490ES-L requires 4.75V ~ 5.25V. Direct substitution would require power supply redesign and voltage regulation modifications. Use LTC490IN8#PBF or MAX488EPA+ for direct replacement without circuit changes.

Q: What is the difference between LTC490IN8#PBF and LTC490CN8#PBF?

A: Both parts are LTC490 series transceivers in 8-DIP packaging with identical electrical specifications (5V supply, 70 mV hysteresis, RS422/RS485 protocol). The primary difference is operating temperature range: LTC490IN8#PBF operates -40°C ~ 85°C (extended), while LTC490CN8#PBF operates 0°C ~ 70°C (commercial). Select based on application temperature requirements.

Q: Why does MAX488EPA+ have lower data rate (250 kbps) than SP490ES-L (5 Mbps)?

A: MAX488 and MAX490 series are different product lines with different performance specifications. MAX488 is optimized for lower data rates with robust noise immunity, while MAX490 supports higher data rates. Both are valid RS422/RS485 transceivers; selection depends on system bandwidth requirements. For applications requiring 5 Mbps or higher, use MAX490 series variants.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed (LTC490IN8#PBF, LTC490CN8#PBF, ADM488ANZ, MAX488EPA+, MAX488CPA+, MAX490CPA+, MAX490ECPA+, MAX3490EPA+, MAX3490EEPA+, MAX3490CPA+) are ROHS3 compliant. The original SP490ES-L is obsolete and does not carry current compliance certifications.

Q: Can I use MAX490ECPA+ as a substitute if my application operates at 0°C ~ 70°C?

A: Yes. MAX490ECPA+ is rated for 0°C ~ 70°C operation and maintains 5V supply voltage (4.75V ~ 5.25V), 70 mV hysteresis, and 8-DIP package compatibility. Data rate is 2.5 Mbps, which is lower than SP490ES-L's 5 Mbps but sufficient for many industrial applications. This part is ROHS3 compliant with 3600 units in stock.

Q: What is the significance of receiver hysteresis in transceiver selection?

A: Receiver hysteresis determines the voltage differential required for the receiver to switch logic states, affecting noise immunity and signal integrity. SP490ES-L specifies 70 mV hysteresis. Substitutes with matching 70 mV hysteresis (MAX488, MAX490, LTC490, ADM488 series) provide equivalent noise rejection. MAX3490 series with 50 mV hysteresis offers tighter threshold control but reduced noise margin.

Q: Is the 8-DIP package pinout identical across all substitute parts?

A: All substitute parts use 8-DIP (0.300", 7.62mm) through-hole packaging. While physical package dimensions are identical, pinout compatibility must be verified against specific datasheets. RS422/RS485 transceivers typically follow standard pinout conventions, but always confirm pin assignments before board-level substitution.

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