SP488ET-L Equivalent & Substitute Parts

Part Overview

The SP488ET-L is a 0/4 Receiver RS422/RS485 interface IC manufactured by MaxLinear, Inc., housed in a 16-SOIC package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The part operates within a 4.75V to 5.25V supply range and supports data rates up to 10 Mbps across industrial temperature ranges of -40°C to 85°C.

Key Parameters

Parameter	SP488ET-L
Manufacturer	MaxLinear, Inc.
Type	Receiver
Protocol	RS422, RS485
Number of Drivers/Receivers	0/4
Data Rate	10 Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package / Case	16-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the SP488ET-L is determined by the following critical parameters:

Primary Compatibility Criteria:

Number of Drivers/Receivers: 0/4 (mandatory match)
Package / Case: 16-SOIC form factor (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Protocol Support: RS422 and/or RS485 (must support at least one protocol)
Voltage - Supply: 4.75V ~ 5.25V nominal range (acceptable tolerance: 4.5V ~ 5.5V)
Operating Temperature: -40°C ~ 85°C (acceptable match or extended range)

Secondary Considerations:

Receiver Hysteresis: 50-60 mV (acceptable range for RS422/RS485 standards)
Data Rate: 10 Mbps minimum (higher rates acceptable)
Product Status: Active preferred (obsolete parts not suitable for new designs)
Compliance: RoHS3 and REACH status alignment

All substitute parts listed meet the primary compatibility criteria and are classified as active products, making them suitable for design-in and production applications.

Parameter Comparison

Part Number	Manufacturer	Protocol	Voltage - Supply	Operating Temperature	Data Rate	Receiver Hysteresis	Product Status	Packaging
SP488ET-L	MaxLinear, Inc.	RS422, RS485	4.75V ~ 5.25V	-40°C ~ 85°C	10 Mbps	—	Obsolete	Tube
LTC488CSW#PBF	Analog Devices Inc.	RS422, RS485	4.75V ~ 5.25V	0°C ~ 70°C	—	60 mV	Active	Tube
LTC488CSW#TRPBF	Analog Devices Inc.	RS422, RS485	4.75V ~ 5.25V	0°C ~ 70°C	—	60 mV	Active	Tape & Reel (TR)
LTC488ISW#PBF	Analog Devices Inc.	RS422, RS485	4.75V ~ 5.25V	-40°C ~ 85°C	—	60 mV	Active	Tube
LTC488ISW#TRPBF	Analog Devices Inc.	RS422, RS485	4.75V ~ 5.25V	-40°C ~ 85°C	—	60 mV	Active	Tape & Reel (TR)
ST26C32ABDR	STMicroelectronics	RS422, RS423	4.5V ~ 5.5V	-40°C ~ 85°C	20 Mbps	60 mV	Active	Cut Tape (CT) & Digi-Reel®
TB5R1DW	Texas Instruments	—	4.5V ~ 5.5V	-40°C ~ 85°C	—	50 mV	Active	Tube
TB5R2DWR	Texas Instruments	—	4.5V ~ 5.5V	-40°C ~ 85°C	—	50 mV	Active	Tape & Reel (TR)
TB5R3DW	Texas Instruments	—	4.5V ~ 5.5V	-40°C ~ 85°C	—	50 mV	Active	Tube

Engineering Selection Recommendations

Analog Devices LTC488 Series (Recommended Primary Substitutes)

The LTC488ISW#PBF and LTC488ISW#TRPBF variants provide the closest functional match to the SP488ET-L. Both maintain identical supply voltage (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), and protocol support (RS422/RS485). These parts are active products with RoHS3 compliance and unlimited moisture sensitivity rating, making them suitable for new production designs. The tube (PBF) and tape & reel (TRPBF) packaging options accommodate both prototype and high-volume manufacturing workflows.

The LTC488CSW#PBF and LTC488CSW#TRPBF variants are functionally equivalent but operate within a narrower temperature range (0°C ~ 70°C), limiting their use to commercial-grade applications. These remain valid substitutes for non-industrial environments.

STMicroelectronics ST26C32ABDR (Extended Performance Alternative)

The ST26C32ABDR supports RS422 and RS423 protocols with a higher data rate (20 Mbps) and operates across the full industrial temperature range (-40°C ~ 85°C). Supply voltage tolerance is slightly broader (4.5V ~ 5.5V). This part is active and RoHS3 compliant, with significantly higher inventory availability (87,600 units). The ST26C32ABDR is suitable for applications requiring enhanced performance margins.

Texas Instruments TB5R Series (Functional Compatibility)

The TB5R1DW, TB5R2DWR, and TB5R3DW are active receiver ICs in 16-SOIC packages with industrial temperature range support (-40°C ~ 85°C) and supply voltage tolerance (4.5V ~ 5.5V). Protocol specifications are not explicitly defined in the provided data. These parts are RoHS3 compliant and available in both tube and tape & reel packaging. Functional compatibility with RS422/RS485 applications requires verification against detailed datasheets.

Frequently Asked Questions (FAQ)

Q: Can I use LTC488CSW#PBF in place of SP488ET-L in all applications?

A: The LTC488CSW#PBF is functionally compatible for RS422/RS485 receiver applications within its operating temperature range (0°C ~ 70°C). If your application requires operation below 0°C or above 70°C, use LTC488ISW#PBF or LTC488ISW#TRPBF instead, which support the full -40°C ~ 85°C range matching the original part.

Q: What is the difference between LTC488CSW#PBF and LTC488CSW#TRPBF?

A: Both parts are electrically identical. The difference is packaging: #PBF indicates tube packaging suitable for manual assembly and prototyping, while #TRPBF indicates tape & reel packaging optimized for automated pick-and-place assembly in high-volume production.

Q: Is ST26C32ABDR a direct replacement for SP488ET-L?

A: The ST26C32ABDR meets all primary compatibility criteria (0/4 receiver, 16-SOIC package, surface mount, industrial temperature range). It supports RS422 protocol and offers higher data rate performance (20 Mbps vs. 10 Mbps). The supply voltage range is slightly broader (4.5V ~ 5.5V). It is suitable as a direct replacement with performance advantages.

Q: Why are some substitute parts missing protocol specifications?

A: The Texas Instruments TB5R series parts (TB5R1DW, TB5R2DWR, TB5R3DW) have protocol specifications not provided in the available data. Verification against manufacturer datasheets is required to confirm RS422/RS485 compatibility before design-in.

Q: Can I mix packaging types (tube vs. tape & reel) in the same production run?

A: Yes. Tube and tape & reel packaging contain electrically identical components. Mixing packaging types is acceptable from a functional standpoint but may require separate handling procedures and inventory management in manufacturing workflows.

Q: What does MSL (Moisture Sensitivity Level) mean for component selection?

A: MSL indicates the maximum time a component can be exposed to ambient humidity before soldering. The SP488ET-L has MSL 3 (168 hours), while all active substitutes have MSL 1 (unlimited). Lower MSL ratings provide greater flexibility in storage and handling without requiring desiccant packaging or baking procedures.

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