SP1491ECN-L/TR Equivalent & Substitute Parts

Part Overview

The SP1491ECN-L/TR is a 1/1 full-duplex RS422/RS485 transceiver IC 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 design implementations. The part operates within a 4.75V to 5.25V supply voltage range with a 20 Mbps data rate capability and supports full-duplex communication protocols essential for industrial and telecommunications applications.

Key Parameters

Parameter	SP1491ECN-L/TR
Manufacturer	MaxLinear, Inc.
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	70 mV
Data Rate	20 Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
Moisture Sensitivity Level (MSL)	2 (1 Year)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the SP1491ECN-L/TR is determined by the following critical parameters:

Core Functional Requirements:

Protocol compatibility: RS422/RS485 full-duplex operation
Driver/Receiver configuration: 1/1 topology
Receiver hysteresis: 70 mV
Package type: 14-SOIC surface mount

Electrical Compatibility Criteria:

Supply voltage range must encompass or match 4.75V ~ 5.25V
Data rate capability must meet or exceed 20 Mbps requirement
Operating temperature range must support 0°C ~ 70°C minimum

Mechanical Compatibility:

Package footprint: 14-SOIC (0.154", 3.90mm Width)
Surface mount configuration

Substitute parts are grouped into two categories based on supply voltage tolerance and operating temperature range:

Category A - Direct Voltage/Temperature Match: Parts with 4.75V ~ 5.25V supply and 0°C ~ 70°C operating range (LTC491CS#PBF, LTC491CS#TRPBF, MAX491CSD+, MAX491CSD+T, MAX491ECSD+, MAX491ECSD+T)

Category B - Extended Voltage/Temperature Range: Parts with wider supply voltage (4.5V ~ 5.5V) and extended operating temperature (-40°C ~ 85°C) (ISL8491EIBZ, ISL8491EIBZ-T, LTC491IS#PBF, LTC491IS#TRPBF)

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Data Rate	Supply Voltage	Operating Temperature	Package	Product Status	RoHS Status
SP1491ECN-L/TR	MaxLinear, Inc.	RS422, RS485	1/1	Full	70 mV	20 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Obsolete	N/A
ISL8491EIBZ	Renesas Electronics	RS422, RS485	1/1	Full	70 mV	10 Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
ISL8491EIBZ-T	Renesas Electronics	RS422, RS485	1/1	Full	70 mV	10 Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
LTC491CS#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	ROHS3 Compliant
LTC491CS#TRPBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	ROHS3 Compliant
LTC491IS#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
LTC491IS#TRPBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Active	ROHS3 Compliant
MAX491CSD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	ROHS3 Compliant
MAX491CSD+T	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	ROHS3 Compliant
MAX491ECSD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	ROHS3 Compliant
MAX491ECSD+T	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Operating Conditions):

Select from Category A substitutes (LTC491CS#PBF, LTC491CS#TRPBF, MAX491CSD+, MAX491CSD+T, MAX491ECSD+, MAX491ECSD+T) when the application operates within 0°C to 70°C and requires 4.75V to 5.25V supply voltage. These parts maintain identical electrical specifications and thermal operating ranges as the SP1491ECN-L/TR. All Category A parts are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability.

For Extended Environmental Conditions:

Select Category B substitutes (ISL8491EIBZ, ISL8491EIBZ-T, LTC491IS#PBF, LTC491IS#TRPBF) when designs require extended operating temperature range (-40°C to 85°C) or wider supply voltage tolerance (4.5V to 5.5V). These parts provide enhanced environmental robustness while maintaining full RS422/RS485 protocol compatibility and 70 mV receiver hysteresis specification.

Packaging Considerations:

LTC491 series parts are supplied in 14-SO package designation (functionally equivalent to 14-SOIC). ISL8491 and MAX491 series are supplied in standard 14-SOIC package. Both package types are mechanically compatible with 0.154" (3.90mm) width footprints.

Availability and Compliance:

All substitute parts listed carry ROHS3 compliance certification and active product status. Inventory availability ranges from 1,127 to 16,180 units across all substitute options, ensuring procurement feasibility for production volumes.

Frequently Asked Questions (FAQ)

Q: Can the SP1491ECN-L/TR be directly replaced with any of the listed substitutes?

A: Direct replacement is possible with Category A substitutes (LTC491CS#PBF, LTC491CS#TRPBF, MAX491CSD+, MAX491CSD+T, MAX491ECSD+, MAX491ECSD+T) without circuit modification, as they maintain identical supply voltage range (4.75V ~ 5.25V) and operating temperature (0°C ~ 70°C). Category B substitutes (ISL8491EIBZ, ISL8491EIBZ-T, LTC491IS#PBF, LTC491IS#TRPBF) are functionally compatible but offer extended environmental specifications.

Q: What is the significance of the 70 mV receiver hysteresis specification?

A: The 70 mV receiver hysteresis is a critical parameter for RS422/RS485 signal integrity. All listed substitutes maintain this specification, ensuring equivalent noise immunity and signal detection characteristics. This parameter must not be compromised during substitution.

Q: Are there differences in data rate capability among the substitutes?

A: Yes. The original SP1491ECN-L/TR supports 20 Mbps. Category A MAX491 series parts support 2.5 Mbps. ISL8491 series parts support 10 Mbps. LTC491 series data rate is not specified in available documentation. For applications requiring the full 20 Mbps capability, verify that the selected substitute meets your specific bandwidth requirements.

Q: What is the difference between tube and tape & reel packaging options?

A: Tube packaging (PBF designation) is suitable for manual assembly and smaller production volumes. Tape & Reel packaging (TRPBF or -T designation) is optimized for automated pick-and-place assembly and high-volume manufacturing. Both packaging formats contain identical die and electrical specifications; selection depends on assembly process requirements.

Q: Why do some substitutes have extended operating temperature ranges?

A: Extended temperature range variants (LTC491IS, ISL8491EIBZ) are designed for industrial and automotive applications requiring operation beyond standard commercial temperature limits (-40°C to 85°C versus 0°C to 70°C). Selection depends on the target application environment.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting current environmental and hazardous substance restrictions for electronic components in regulated markets.

Q: What is the MSL (Moisture Sensitivity Level) consideration for substitutes?

A: The original SP1491ECN-L/TR carries MSL 2 (1 Year). Most substitutes carry MSL 1 (Unlimited) or MSL 3 (168 Hours), indicating different moisture sensitivity profiles. MSL 1 parts offer superior moisture tolerance for storage and handling. Verify MSL requirements based on your manufacturing environment and storage conditions.

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