SP491ECN-L RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The SP491ECN-L is a 1/1 full-duplex RS422/RS485 transceiver 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 part operates across a 4.75V to 5.25V supply range with a 10Mbps data rate and supports industrial temperature ranges from -40°C to 85°C.

Key Parameters

Parameter	SP491ECN-L
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS422, RS485
Drivers/Receivers	1/1
Duplex	Full
Data Rate	10Mbps
Receiver Hysteresis	70 mV
Supply Voltage	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the SP491ECN-L is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol support: RS422 and RS485
Configuration: 1/1 driver/receiver topology
Duplex mode: Full-duplex operation
Package type: 14-SOIC surface mount form factor
Supply voltage range: Must accommodate 4.75V to 5.25V operation
Operating temperature: Must support -40°C to 85°C minimum

Secondary Considerations:

Data rate capability: Minimum 10Mbps
Receiver hysteresis: 70 mV baseline
Moisture sensitivity level and compliance certifications

Substitute parts are grouped into two categories based on electrical performance alignment:

Group 1 - Direct Equivalents (Renesas ISL8491 Series): Active status parts with expanded supply voltage range (4.5V to 5.5V), matching receiver hysteresis (70 mV), and identical 10Mbps data rate. These provide pin-compatible replacement with enhanced voltage tolerance.

Group 2 - Enhanced Performance Alternatives (Analog Devices LTC2864 Series): Active status parts with superior data rate capability (20Mbps or 250kbps variants), wider supply voltage range (3V to 5.5V), and higher receiver hysteresis (150 mV). These offer extended operating temperature ranges and improved noise immunity at the cost of different thermal specifications.

Parameter Comparison

Part Number	Manufacturer	Protocol	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Product Status	Packaging
SP491ECN-L	MaxLinear, Inc.	RS422, RS485	10Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	Obsolete	14-SOIC
ISL8491EIBZ	Renesas Electronics	RS422, RS485	10Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	70 mV	Active	14-SOIC (Tube)
ISL8491EIBZ-T	Renesas Electronics	RS422, RS485	10Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	70 mV	Active	14-SOIC (CT & Digi-Reel)
LTC2864CS-1#PBF	Analog Devices Inc.	RS422, RS485	20Mbps	3V ~ 5.5V	0°C ~ 70°C	150 mV	Active	14-SO (Tube)
LTC2864CS-1#TRPBF	Analog Devices Inc.	RS422, RS485	20Mbps	3V ~ 5.5V	0°C ~ 70°C	150 mV	Active	14-SO (Tape & Reel)
LTC2864CS-2#PBF	Analog Devices Inc.	RS422, RS485	250kbps	3V ~ 5.5V	0°C ~ 70°C	150 mV	Active	14-SO (Tube)
LTC2864CS-2#TRPBF	Analog Devices Inc.	RS422, RS485	250kbps	3V ~ 5.5V	0°C ~ 70°C	150 mV	Active	14-SO (Tape & Reel)
LTC2864HS-1#PBF	Analog Devices Inc.	RS422, RS485	20Mbps	3V ~ 5.5V	-40°C ~ 125°C	150 mV	Active	14-SO (Tube)
LTC2864HS-1#TRPBF	Analog Devices Inc.	RS422, RS485	20Mbps	3V ~ 5.5V	-40°C ~ 125°C	150 mV	Active	14-SO (CT & Digi-Reel)
LTC2864HS-2#PBF	Analog Devices Inc.	RS422, RS485	250kbps	3V ~ 5.5V	-40°C ~ 125°C	150 mV	Active	14-SO (Tube)
LTC2864HS-2#TRPBF	Analog Devices Inc.	RS422, RS485	250kbps	3V ~ 5.5V	-40°C ~ 125°C	150 mV	Active	14-SO (Tape & Reel)

Engineering Selection Recommendations

For Direct Replacement (Renesas ISL8491 Series):

The ISL8491EIBZ and ISL8491EIBZ-T represent the closest functional equivalents to the SP491ECN-L. Both parts maintain identical protocol support, data rate, receiver hysteresis, and operating temperature range. The expanded supply voltage tolerance (4.5V to 5.5V versus 4.75V to 5.25V) provides additional design margin. Both variants are ROHS3 compliant and carry active product status, ensuring long-term availability. Selection between tube (ISL8491EIBZ) and cut tape/digi-reel (ISL8491EIBZ-T) packaging depends on procurement and assembly requirements.

For Enhanced Performance Applications (Analog Devices LTC2864 Series):

The LTC2864 family offers superior electrical performance with 20Mbps data rate capability and 150 mV receiver hysteresis, providing improved noise immunity in electrically noisy environments. The LTC2864HS variants extend the operating temperature range to -40°C to 125°C, accommodating extended industrial and automotive applications. The LTC2864CS variants operate within 0°C to 70°C, suitable for standard industrial environments. All LTC2864 parts are ROHS3 compliant with active product status. Selection of CS versus HS variants depends on thermal requirements; selection of -1 (20Mbps) versus -2 (250kbps) variants depends on required data rate.

Compliance and Certification:

All substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory framework of the original SP491ECN-L. Moisture sensitivity levels vary: Renesas ISL8491 parts carry MSL 3 (168 hours), while Analog Devices LTC2864 parts carry MSL 1 (unlimited), indicating superior moisture tolerance for the LTC2864 family.

Frequently Asked Questions (FAQ)

Q: Can the ISL8491EIBZ directly replace the SP491ECN-L in existing designs?

A: Yes. The ISL8491EIBZ maintains identical protocol support (RS422/RS485), configuration (1/1 full-duplex), data rate (10Mbps), receiver hysteresis (70 mV), and operating temperature range (-40°C to 85°C). The expanded supply voltage range (4.5V to 5.5V) is backward compatible with designs operating at 4.75V to 5.25V. Pin compatibility and package form factor (14-SOIC) are identical.

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

A: Both parts are electrically identical. The difference is packaging format: ISL8491EIBZ is supplied in tube packaging, while ISL8491EIBZ-T is supplied in cut tape and digi-reel format. Selection depends on assembly line requirements and procurement preferences.

Q: Why would I choose an LTC2864 part over the ISL8491?

A: The LTC2864 family offers enhanced performance characteristics: 20Mbps data rate (versus 10Mbps), 150 mV receiver hysteresis (versus 70 mV), and wider supply voltage range (3V to 5.5V). The LTC2864HS variants additionally support extended temperature operation (-40°C to 125°C). These features provide improved noise immunity and thermal headroom for demanding applications. Trade-offs include different thermal specifications and moisture sensitivity levels.

Q: What is the difference between LTC2864CS and LTC2864HS variants?

A: The LTC2864CS variants operate within 0°C to 70°C, suitable for standard industrial environments. The LTC2864HS variants extend operation to -40°C to 125°C, accommodating extended temperature ranges required in automotive and harsh industrial applications. Electrical performance (data rate, hysteresis, supply voltage) remains identical between CS and HS variants.

Q: What is the difference between LTC2864-1 and LTC2864-2 variants?

A: The LTC2864-1 variants support 20Mbps data rate, suitable for high-speed RS422/RS485 applications. The LTC2864-2 variants support 250kbps data rate, suitable for lower-speed industrial communication protocols. Both variants maintain identical supply voltage range, receiver hysteresis, and temperature specifications within their respective CS or HS families.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (ISL8491EIBZ, ISL8491EIBZ-T, and all LTC2864 variants) carry ROHS3 compliance certification. All parts are REACH unaffected, matching the regulatory status of the original SP491ECN-L.

Q: What packaging options are available for the LTC2864 family?

A: LTC2864 parts are available in two packaging formats: tube packaging (CS and HS base variants) and tape & reel (TR) packaging (CS-#TRPBF and HS-#TRPBF variants). Selection depends on assembly line automation requirements and procurement volume.

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