SP485CS-L Equivalent & Substitute Parts

Part Overview

The SP485CS-L is a half-duplex RS422/RS485 transceiver IC manufactured by MaxLinear, Inc., housed in an 8-pin DIP package for through-hole mounting. This device operates at 5V supply voltage with a 5 Mbps data rate and 10 mV receiver hysteresis. The part is currently obsolete, making equivalent substitutes necessary for ongoing system support and new designs requiring compatible functionality.

Key Parameters

Parameter	SP485CS-L
Manufacturer	MaxLinear, Inc.
Type	Transceiver Half-Duplex
Protocol	RS422, RS485
Drivers/Receivers	1/1
Data Rate	5 Mbps
Supply Voltage	4.75V – 5.25V
Operating Temperature	0°C – 70°C
Receiver Hysteresis	10 mV
Mounting Type	Through Hole
Package	8-DIP (0.300", 7.62mm)
Moisture Sensitivity	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SP485CS-L is determined by the following critical parameters:

Protocol Compatibility: RS422/RS485 half-duplex operation
Driver/Receiver Configuration: 1/1 topology
Supply Voltage Range: 4.75V – 5.25V
Package Type: 8-DIP through-hole mounting
Functional Data Rate: Minimum 5 Mbps or unspecified (indicating compatibility)
Operating Temperature Range: Must encompass or match 0°C – 70°C
Receiver Hysteresis: 10 mV or higher acceptable

Substitute parts are grouped into two categories:

Category A – Direct Package Match (8-DIP Through-Hole): Parts maintaining identical physical form factor and mounting method, enabling direct PCB replacement without layout modification.

Category B – Alternative Package (8-SOIC Surface Mount): Parts with equivalent electrical specifications but different mounting technology, requiring PCB redesign.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Protocol	Data Rate	Supply Voltage	Temp Range	Hysteresis	Product Status
SP485CS-L	MaxLinear	8-DIP	Through Hole	RS422/RS485	5 Mbps	4.75V – 5.25V	0°C – 70°C	10 mV	Obsolete
SP483EN-L/TR	MaxLinear	8-SOIC	Surface Mount	RS422/RS485	250 kbps	4.75V – 5.25V	-40°C – 85°C	10 mV	Active
ADM1485ANZ	Analog Devices	8-DIP	Through Hole	RS422/RS485	30 Mbps	4.75V – 5.25V	-40°C – 85°C	70 mV	Active
ADM1485JNZ	Analog Devices	8-DIP	Through Hole	RS422/RS485	30 Mbps	4.75V – 5.25V	0°C – 70°C	70 mV	Active
ADM485ANZ	Analog Devices	8-DIP	Through Hole	RS422/RS485	5 Mbps	4.75V – 5.25V	-40°C – 85°C	70 mV	Active
ADM485JNZ	Analog Devices	8-DIP	Through Hole	RS422/RS485	5 Mbps	4.75V – 5.25V	0°C – 70°C	70 mV	Active
LTC1485CN8#PBF	Analog Devices	8-DIP	Through Hole	RS422/RS485	—	4.75V – 5.25V	0°C – 70°C	60 mV	Active
LTC1485IN8#PBF	Analog Devices	8-DIP	Through Hole	RS422/RS485	—	4.75V – 5.25V	-40°C – 85°C	60 mV	Active
LTC485CN8#PBF	Analog Devices	8-DIP	Through Hole	RS422/RS485	—	4.75V – 5.25V	0°C – 70°C	70 mV	Active
LTC485IN8#PBF	Analog Devices	8-DIP	Through Hole	RS422/RS485	—	4.75V – 5.25V	-40°C – 85°C	70 mV	Active
MAX1487CPA+	Analog Devices/Maxim	8-DIP	Through Hole	RS422/RS485	2.5 Mbps	4.75V – 5.25V	0°C – 70°C	70 mV	Active

Engineering Selection Recommendations

For Direct PCB Replacement (No Layout Changes)

Select from 8-DIP through-hole packages: ADM1485JNZ, ADM485JNZ, LTC1485CN8#PBF, LTC485CN8#PBF, or MAX1487CPA+. These maintain identical physical footprints and mounting technology. ADM1485JNZ and ADM485JNZ are ROHS3 compliant with extended temperature range support (-40°C – 85°C). LTC1485CN8#PBF and LTC485CN8#PBF are ROHS3 compliant and suitable for 0°C – 70°C applications. MAX1487CPA+ is ROHS3 compliant with 0°C – 70°C operating range.

For Extended Temperature Range Applications

ADM1485ANZ, LTC1485IN8#PBF, and LTC485IN8#PBF support -40°C – 85°C operation. All three are ROHS3 compliant and REACH unaffected. These are appropriate when the original 0°C – 70°C specification requires expansion.

For Surface Mount Redesigns

SP483EN-L/TR provides an active alternative with 8-SOIC packaging. This part is RoHS compliant and supports -40°C – 85°C operation, but requires PCB layout modification and surface mount assembly capability.

All recommended substitutes maintain 4.75V – 5.25V supply voltage compatibility and RS422/RS485 protocol support. Product status is active for all listed alternatives, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can ADM1485ANZ directly replace SP485CS-L on an existing PCB?

A: Yes. Both use 8-DIP through-hole packaging with identical pin spacing (0.300", 7.62mm). No PCB modification is required. ADM1485ANZ supports extended temperature range (-40°C – 85°C) compared to the original 0°C – 70°C specification.

Q: What is the difference between ADM1485ANZ and ADM1485JNZ?

A: Both are Analog Devices ADM1485 transceivers in 8-DIP packages with identical electrical specifications (30 Mbps data rate, 70 mV hysteresis, ROHS3 compliant). The primary difference is operating temperature: ADM1485ANZ supports -40°C – 85°C, while ADM1485JNZ supports 0°C – 70°C. Select based on your application's thermal requirements.

Q: Why does SP483EN-L/TR have a lower data rate (250 kbps) than SP485CS-L (5 Mbps)?

A: SP483EN-L/TR is a different product line within MaxLinear's RS485 transceiver portfolio. While it maintains protocol compatibility and supply voltage specifications, the reduced data rate reflects its design parameters. This part is suitable only for applications not requiring 5 Mbps performance.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed active substitutes carry RoHS3 compliance certification. SP485CS-L status is obsolete and does not carry current RoHS certification.

Q: Can I use LTC1485CN8#PBF in a -40°C application?

A: No. LTC1485CN8#PBF operates from 0°C – 70°C. For -40°C – 85°C applications, use LTC1485IN8#PBF instead. Both are LTC1485 variants with identical electrical specifications; the temperature range is the distinguishing factor.

Q: What is the significance of receiver hysteresis differences (10 mV vs. 60–70 mV)?

A: Receiver hysteresis affects noise immunity and switching threshold behavior. The SP485CS-L specifies 10 mV hysteresis. Substitutes with 60–70 mV hysteresis provide greater noise immunity in electrically noisy environments. This is not a compatibility issue; higher hysteresis is generally beneficial for signal integrity.

Q: Is MAX1487CPA+ suitable for my 5 Mbps application?

A: MAX1487CPA+ specifies 2.5 Mbps data rate, which is below the SP485CS-L 5 Mbps specification. Use this part only if your actual application data rate is 2.5 Mbps or lower. For full 5 Mbps performance, select ADM485JNZ or ADM485ANZ instead.

Q: What does "REACH Unaffected" mean for Analog Devices parts?

A: REACH Unaffected indicates the part does not contain substances of very high concern (SVHC) listed under EU REACH regulations. This certification is relevant for applications subject to European regulatory requirements.

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