SP485REP-L Equivalent & Substitute Parts

Part Overview

The SP485REP-L is a half-duplex RS422/RS485 transceiver IC manufactured by MaxLinear, Inc., housed in an 8-DIP through-hole package. This interface component operates at 5Mbps data rate with a supply voltage range of 4.75V to 5.25V and temperature range of -40°C to 85°C. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing system support and new designs requiring this functionality.

Key Parameters

Parameter	SP485REP-L Value
Type	Transceiver Half-Duplex
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Data Rate	5Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SP485REP-L is determined by strict alignment of the following parameters:

Protocol Compatibility: RS422/RS485 half-duplex operation
Driver/Receiver Configuration: 1/1 transceiver architecture
Electrical Specifications: Supply voltage 4.75V ~ 5.25V
Package Type: 8-DIP through-hole form factor
Temperature Range: Operating range must encompass or match -40°C ~ 85°C
Moisture Sensitivity: MSL 1 classification

Substitute parts are grouped into two categories based on these criteria:

Category A - Direct Package Match (8-DIP Through-Hole): Parts maintaining identical package geometry and mounting type, suitable for direct PCB replacement without layout modification.

Category B - Package Variant (8-SOIC Surface Mount): Parts with equivalent electrical specifications but different package type, requiring PCB redesign for implementation.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Supply Voltage	Temp Range	Package	Mounting	Product Status
SP485REP-L	MaxLinear, Inc.	RS422, RS485	1/1	5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Obsolete
SP485REN-L/TR	MaxLinear, Inc.	RS422, RS485	1/1	5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Surface Mount	Active
ADM1485ANZ	Analog Devices Inc.	RS422, RS485	1/1	30Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active
ADM1485JNZ	Analog Devices Inc.	RS422, RS485	1/1	30Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
ADM485ANZ	Analog Devices Inc.	RS422, RS485	1/1	5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active
ADM485JNZ	Analog Devices Inc.	RS422, RS485	1/1	5Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
LTC1485CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	—	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
LTC1485IN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	—	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active
LTC485CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	—	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
LTC485IN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	—	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active
MAX1487CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	2.5Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active

Engineering Selection Recommendations

For Direct PCB Replacement (No Layout Changes Required):

Select from 8-DIP through-hole parts with matching or extended temperature range specifications:

ADM485ANZ: Matches SP485REP-L temperature range (-40°C ~ 85°C), 5Mbps data rate, 8-DIP package. ROHS3 compliant. Recommended for applications requiring identical thermal performance.
LTC1485IN8#PBF: Matches SP485REP-L temperature range (-40°C ~ 85°C), 8-DIP package. ROHS3 compliant. Suitable when data rate specification is not critical.
ADM1485ANZ: Exceeds SP485REP-L performance with 30Mbps data rate while maintaining -40°C ~ 85°C temperature range and 8-DIP package. ROHS3 compliant. Appropriate for applications requiring higher bandwidth capability.

For Temperature-Constrained Applications (0°C ~ 70°C):

ADM485JNZ: 5Mbps data rate, 8-DIP package, 0°C ~ 70°C operating range. ROHS3 compliant.
LTC1485CN8#PBF: 8-DIP package, 0°C ~ 70°C operating range. ROHS3 compliant.
MAX1487CPA+: 2.5Mbps data rate, 8-DIP package, 0°C ~ 70°C operating range. ROHS3 compliant.

For Surface Mount Implementation (PCB Redesign Required):

SP485REN-L/TR: MaxLinear manufacturer variant, 5Mbps data rate, -40°C ~ 85°C temperature range, 8-SOIC package. RoHS compliant. Maintains electrical equivalence with package transition to surface mount.

All recommended substitutes maintain MSL 1 classification and are ROHS3 or RoHS compliant, ensuring regulatory alignment with modern manufacturing standards.

Frequently Asked Questions (FAQ)

Q: Can I use ADM1485ANZ as a direct replacement for SP485REP-L?

A: Yes. ADM1485ANZ maintains identical package geometry (8-DIP), electrical specifications (RS422/RS485, 1/1 configuration, 4.75V ~ 5.25V supply), and temperature range (-40°C ~ 85°C). The 30Mbps data rate exceeds the SP485REP-L specification of 5Mbps, providing additional performance margin without compatibility issues.

Q: What is the difference between ADM485ANZ and ADM1485ANZ?

A: Both are Analog Devices RS422/RS485 half-duplex transceivers in 8-DIP packages with -40°C ~ 85°C temperature range and ROHS3 compliance. ADM485ANZ operates at 5Mbps, matching SP485REP-L data rate. ADM1485ANZ operates at 30Mbps with enhanced receiver hysteresis (70mV). Selection depends on bandwidth requirements.

Q: Why do some substitute parts show no data rate specification?

A: LTC1485 and LTC485 series parts do not have data rate values provided in the specification data. These parts are functionally equivalent for RS422/RS485 half-duplex operation and maintain all other critical parameters (supply voltage, temperature range, package type, driver/receiver configuration).

Q: Can I use MAX1487CPA+ if my application operates at -40°C?

A: No. MAX1487CPA+ has an operating temperature range of 0°C ~ 70°C, which does not encompass -40°C. For applications requiring -40°C operation, select ADM485ANZ, LTC1485IN8#PBF, LTC485IN8#PBF, or ADM1485ANZ.

Q: Is SP485REN-L/TR a suitable replacement if I can modify my PCB layout?

A: Yes, if PCB redesign is feasible. SP485REN-L/TR is the active MaxLinear equivalent with identical electrical specifications (5Mbps, -40°C ~ 85°C, RS422/RS485, 1/1 configuration) but uses 8-SOIC surface mount packaging instead of 8-DIP through-hole. This requires PCB layout modification but maintains manufacturer continuity.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitutes carry ROHS3 or RoHS compliance certification, meeting current regulatory requirements for electronic component manufacturing and assembly.

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

A: Receiver hysteresis (60mV or 70mV) affects noise immunity and signal detection margins. LTC1485 series specifies 60mV hysteresis, while ADM and MAX series specify 70mV. Both values are within acceptable operating parameters for RS422/RS485 applications and do not prevent substitution.

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