SP483CS-L RS422/RS485 Half Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The SP483CS-L is a half-duplex RS422/RS485 transceiver manufactured by MaxLinear, Inc., housed in an 8-DIP package. This interface IC supports 1/1 driver/receiver configuration with a 250 kbps data rate and operates across a 4.75V to 5.25V supply voltage range at 0°C to 70°C. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functionality.

Key Parameters

Parameter	SP483CS-L
Manufacturer	MaxLinear, Inc.
Protocol	RS422, RS485
Type	Transceiver Half Duplex
Number of Drivers/Receivers	1/1
Data Rate	250 kbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Receiver Hysteresis	10 mV
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SP483CS-L is determined by strict adherence to the following electrical and mechanical parameters:

Core Compatibility Requirements:

Protocol: RS422/RS485 half-duplex operation
Configuration: 1/1 driver/receiver
Package: 8-DIP (0.300", 7.62mm)
Mounting: Through Hole
Data Rate: 250 kbps (where specified)
Supply Voltage: 4.75V ~ 5.25V (primary requirement for direct substitution)
Operating Temperature: 0°C ~ 70°C (primary requirement for direct substitution)

Substitution Groups:

Group A - Direct Substitutes (5V Supply, 0°C ~ 70°C): Parts meeting all core requirements with matching 5V supply and commercial temperature range. These provide pin-compatible replacement without design modification.

Group B - Extended Temperature Substitutes (-40°C ~ 85°C): Parts with identical electrical specifications but extended operating temperature range. Suitable for applications requiring wider temperature operation.

Group C - Alternative Supply Voltage (3V ~ 3.6V): Parts with identical functional specifications but different supply voltage. Require circuit design verification before substitution.

Group D - Legacy Alternatives (Hysteresis Variation): Parts with different receiver hysteresis specifications. Acceptable where receiver threshold sensitivity differences do not impact system performance.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package	Product Status	RoHS Status
SP483CS-L	MaxLinear, Inc.	RS422, RS485	1/1	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	10 mV	8-DIP	Obsolete	-
LTC1483CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	45 mV	8-DIP	Active	ROHS3 Compliant
LTC1483IN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	45 mV	8-DIP	Active	ROHS3 Compliant
LTC485CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	-	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	8-DIP	Active	ROHS3 Compliant
LTC485IN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	-	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	8-DIP	Active	ROHS3 Compliant
MAX1483CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	250 kbps	4.75V ~ 5.25V	0°C ~ 70°C	75 mV	8-DIP	Active	ROHS3 Compliant
MAX1483EPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	250 kbps	4.75V ~ 5.25V	-40°C ~ 85°C	75 mV	8-DIP	Active	ROHS3 Compliant
MAX3483CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	250 kbps	3V ~ 3.6V	0°C ~ 70°C	50 mV	8-DIP	Active	ROHS3 Compliant
MAX3483ECPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	250 kbps	3V ~ 3.6V	0°C ~ 70°C	50 mV	8-DIP	Active	ROHS3 Compliant
MAX3483EEPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	250 kbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-DIP	Active	ROHS3 Compliant
MAX3483EPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	250 kbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-DIP	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (5V Supply, Commercial Temperature):

LTC1483CN8#PBF and MAX1483CPA+ are the preferred direct substitutes for SP483CS-L. Both maintain the 4.75V ~ 5.25V supply voltage and 0°C ~ 70°C operating temperature range. LTC1483CN8#PBF offers 15,400 units in stock with ROHS3 compliance. MAX1483CPA+ provides 2,548 units with identical compliance status. Both are active products with established supply chains.

Extended Temperature Applications:

LTC1483IN8#PBF and MAX1483EPA+ extend operating range to -40°C ~ 85°C while maintaining 5V supply compatibility. These are suitable for industrial and automotive applications requiring wider temperature operation. LTC1483IN8#PBF has 865 units available; MAX1483EPA+ has 3,022 units.

Alternative Supply Voltage (3V ~ 3.6V):

MAX3483 series parts (MAX3483CPA+, MAX3483ECPA+, MAX3483EEPA+, MAX3483EPA+) operate at 3V ~ 3.6V supply. These require circuit redesign and are not direct pin-compatible substitutes in 5V systems. Selection depends on target supply voltage architecture.

Legacy Alternatives:

LTC485CN8#PBF and LTC485IN8#PBF provide RS422/RS485 functionality with 70 mV receiver hysteresis. Data rate specification is not provided for these parts. Use only where hysteresis tolerance and unspecified data rate do not impact system requirements.

All substitute parts listed carry ROHS3 compliance and REACH unaffected status, meeting modern environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LTC1483CN8#PBF directly replace SP483CS-L without PCB modification?

A: Yes. LTC1483CN8#PBF maintains identical supply voltage (4.75V ~ 5.25V), operating temperature (0°C ~ 70°C), data rate (250 kbps), package (8-DIP), and mounting type (Through Hole). The 45 mV receiver hysteresis differs from the original 10 mV specification but remains within RS422/RS485 standard tolerances. Pin-to-pin compatibility is maintained.

Q: What is the difference between LTC1483CN8#PBF and LTC1483IN8#PBF?

A: Both parts are functionally identical RS422/RS485 transceivers with 250 kbps data rate and 4.75V ~ 5.25V supply. The primary difference is operating temperature range: LTC1483CN8#PBF operates 0°C ~ 70°C (commercial), while LTC1483IN8#PBF operates -40°C ~ 85°C (industrial). Select based on application temperature requirements.

Q: Why do MAX3483 series parts have different supply voltage?

A: MAX3483 series is designed for 3V ~ 3.6V operation, targeting low-power and battery-powered applications. These parts are not direct substitutes for SP483CS-L in 5V systems. Substitution requires circuit redesign and power supply modification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, meeting current environmental regulations. SP483CS-L compliance status is not specified in available documentation.

Q: What does receiver hysteresis affect in RS422/RS485 operation?

A: Receiver hysteresis determines the voltage difference between logic high and low thresholds, affecting noise immunity and signal detection reliability. SP483CS-L specifies 10 mV; substitute parts range from 45 mV to 75 mV. Higher hysteresis provides greater noise immunity but may reduce sensitivity to weak signals. Verify application requirements before substitution.

Q: Can I use MAX1483EPA+ in place of MAX1483CPA+?

A: Yes, with temperature range consideration. MAX1483EPA+ extends operating range to -40°C ~ 85°C while maintaining all other specifications. If your application operates within 0°C ~ 70°C, either part is acceptable. MAX1483EPA+ provides additional temperature margin at no functional cost.

Q: Is data rate specification critical for substitution?

A: Yes. SP483CS-L and most substitute parts specify 250 kbps data rate. LTC485CN8#PBF and LTC485IN8#PBF do not specify data rate. Use these only where system data rate requirements are not critical or where lower data rates are acceptable.

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