SP3491CN-L RS422/RS485 Transceiver Equivalent & Substitute Parts

Part Overview

The SP3491CN-L is a full-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., designed for serial communication applications requiring robust noise immunity and integrated driver/receiver functionality. This 14-SOIC surface-mount interface IC operates at 3V to 3.6V supply voltage with a 10 Mbps data rate capability and is classified as Active product status with RoHS compliance.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and functional specifications align within the allowed parameter ranges for RS422/RS485 transceiver applications. Substitution becomes necessary due to inventory availability, supply chain optimization, or design flexibility requirements across manufacturing batches.

Key Parameters

Parameter	SP3491CN-L
Manufacturer	MaxLinear, Inc.
Protocol	RS422, RS485
Type	Transceiver
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	25 mV
Data Rate	10 Mbps
Voltage - Supply	3V ~ 3.6V
Operating Temperature	0°C ~ 70°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)

Substitute Part Grouping Explanation

Substitution logic for the SP3491CN-L is based on the following critical parameters:

Mandatory Compatibility Criteria:

Protocol: RS422/RS485 full-duplex transceiver functionality
Package: 14-SOIC form factor with 0.154" (3.90mm) width
Mounting Type: Surface mount
Number of Drivers/Receivers: 1/1 configuration
Duplex Mode: Full-duplex operation

Allowable Parameter Variations:

Receiver Hysteresis: 25 mV to 70 mV (higher hysteresis acceptable for noise-tolerant applications)
Data Rate: 2.5 Mbps to 10 Mbps (lower rates compatible with SP3491CN-L applications)
Voltage Supply: 3V ~ 3.6V (primary) or 4.75V ~ 5.25V (alternative supply domain)
Operating Temperature: 0°C ~ 70°C (primary) or -40°C ~ 85°C (extended range acceptable)
RoHS Status: RoHS Compliant or ROHS3 Compliant

Substitute parts are grouped into two categories: direct voltage-domain equivalents (3V ~ 3.6V supply) and alternative supply-domain substitutes (4.75V ~ 5.25V supply). Within each category, parts are further differentiated by packaging format (Tube, Tape & Reel, Cut Tape) and operating temperature range.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Data Rate	Voltage Supply	Operating Temp	Package	Packaging Format	RoHS Status
SP3491CN-L	MaxLinear, Inc.	RS422, RS485	1/1	Full	25 mV	10 Mbps	3V ~ 3.6V	0°C ~ 70°C	14-SOIC	Tube	RoHS Compliant
LTC491CS#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Tube	ROHS3 Compliant
LTC491CS#TRPBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	0°C ~ 70°C	14-SOIC	Tape & Reel (TR)	ROHS3 Compliant
LTC491IS#PBF	Analog Devices Inc.	RS422, RS485	1/1	Full	70 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	14-SOIC	Tube	ROHS3 Compliant
MAX3491ECSD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	50 mV	10 Mbps	3V ~ 3.6V	0°C ~ 70°C	14-SOIC	Tube	ROHS3 Compliant
MAX3491ECSD+T	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	50 mV	10 Mbps	3V ~ 3.6V	0°C ~ 70°C	14-SOIC	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant
MAX3491EESD+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	50 mV	10 Mbps	3V ~ 3.6V	-40°C ~ 85°C	14-SOIC	Tube	ROHS3 Compliant
MAX3491EESD+T	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Full	50 mV	10 Mbps	3V ~ 3.6V	-40°C ~ 85°C	14-SOIC	Cut Tape (CT) & Digi-Reel®	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	Tube	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	Cut Tape (CT) & Digi-Reel®	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	Tube	ROHS3 Compliant

Engineering Selection Recommendations

Direct Voltage-Domain Equivalents (3V ~ 3.6V Supply):

The MAX3491ECSD+, MAX3491ECSD+T, MAX3491EESD+, and MAX3491EESD+T parts operate within the same 3V ~ 3.6V supply voltage range as the SP3491CN-L. These parts maintain 10 Mbps data rate capability and are manufactured by Analog Devices Inc./Maxim Integrated with ROHS3 compliance. The MAX3491 series exhibits 50 mV receiver hysteresis compared to the SP3491CN-L's 25 mV specification. Selection between tube and cut tape packaging formats depends on assembly process requirements. Extended temperature range variants (MAX3491EESD+ and MAX3491EESD+T) support -40°C ~ 85°C operation for applications requiring broader thermal performance.

Alternative Supply-Domain Substitutes (4.75V ~ 5.25V Supply):

The LTC491CS#PBF, LTC491CS#TRPBF, LTC491IS#PBF, MAX491CSD+, MAX491CSD+T, and MAX491ECSD+ parts operate at 4.75V ~ 5.25V supply voltage, requiring circuit-level voltage domain adjustment. These parts are suitable only when system power architecture supports 5V supply rails. The LTC491 series (Analog Devices Inc.) and MAX491 series (Analog Devices Inc./Maxim Integrated) both carry ROHS3 compliance. Data rate specifications for MAX491 variants are 2.5 Mbps, which is lower than the SP3491CN-L's 10 Mbps capability. The LTC491IS#PBF provides extended temperature range (-40°C ~ 85°C) for demanding thermal environments.

Compliance and Certification:

All substitute parts maintain RoHS or ROHS3 compliance status. Moisture sensitivity levels for substitute parts are rated at MSL 1 (Unlimited) compared to the SP3491CN-L's MSL 2 (1 Year), indicating improved moisture tolerance in substitute options.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SP3491CN-L with a 4.75V ~ 5.25V supply part like the MAX491CSD+?

A: Substitution requires circuit-level voltage domain modification. The SP3491CN-L operates at 3V ~ 3.6V supply, while MAX491CSD+ requires 4.75V ~ 5.25V. Direct pin-for-pin replacement without power supply redesign will result in device malfunction. Voltage domain substitution is only valid when system architecture supports dual supply rails or when power conversion circuitry is implemented.

Q: What is the significance of receiver hysteresis differences between the SP3491CN-L (25 mV) and substitute parts (50 mV or 70 mV)?

A: Receiver hysteresis determines the voltage differential required for input state transitions. Higher hysteresis values (50 mV or 70 mV) provide improved noise immunity in electrically noisy environments but may reduce sensitivity to small signal variations. The SP3491CN-L's 25 mV hysteresis is suitable for clean signal environments. Substitution with higher hysteresis parts is acceptable for applications where noise margins are not critical.

Q: Are tube and tape & reel packaging formats electrically equivalent?

A: Yes. Tube (individual packaging) and Tape & Reel (TR) or Cut Tape (CT) formats contain identical die and electrical specifications. Packaging format selection depends on assembly process automation requirements. Tape & Reel and Cut Tape formats are optimized for high-volume automated pick-and-place assembly, while Tube packaging is suitable for lower-volume or manual assembly processes.

Q: Can I use the LTC491IS#PBF with extended temperature range (-40°C ~ 85°C) in place of the SP3491CN-L rated for 0°C ~ 70°C?

A: The LTC491IS#PBF is electrically compatible within its specified operating range. However, it operates at 4.75V ~ 5.25V supply voltage, requiring power domain modification. If your application requires extended temperature operation beyond 0°C ~ 70°C and supports 5V supply rails, the LTC491IS#PBF is a valid substitute. For 3V ~ 3.6V supply systems requiring extended temperature range, use MAX3491EESD+ or MAX3491EESD+T instead.

Q: What is the data rate impact when substituting with MAX491 series parts rated at 2.5 Mbps instead of 10 Mbps?

A: The SP3491CN-L supports 10 Mbps serial communication. MAX491 series parts are rated for 2.5 Mbps maximum data rate. Substitution is valid only for applications operating at or below 2.5 Mbps. Applications requiring 10 Mbps performance must use SP3491CN-L or MAX3491 series parts (which maintain 10 Mbps capability).

Q: Are all substitute parts RoHS compliant?

A: Yes. The SP3491CN-L carries RoHS Compliant status, and all listed substitute parts carry either RoHS Compliant or ROHS3 Compliant certification. ROHS3 represents the current RoHS 3 directive compliance standard and is fully compatible with RoHS requirements.

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