DS481TM Equivalent & Substitute Parts

Part Overview

The DS481TM is a half-duplex RS422/RS485 transceiver interface IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The DS481TM operates at 2 Mbps data rate with a 4.75V to 5.25V supply voltage range and supports industrial temperature operation from -40°C to 85°C. Identifying compatible alternatives ensures design continuity and supply chain reliability.

Key Parameters

Parameter	DS481TM Value
Manufacturer	Texas Instruments
Protocol	RS422, RS485
Duplex Configuration	Half
Drivers/Receivers	1/1
Data Rate	2 Mbps
Supply Voltage	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package	8-SOIC (0.154", 3.90mm Width)
Receiver Hysteresis	70 mV
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the DS481TM is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Protocol: RS422/RS485 half-duplex operation
Configuration: 1 driver and 1 receiver
Package: 8-SOIC form factor
Duplex Mode: Half-duplex only

Operational Parameters:

Supply voltage range must encompass or be compatible with 4.75V ~ 5.25V
Operating temperature range must support -40°C ~ 85°C minimum
Data rate must meet or exceed 2 Mbps requirement
Receiver hysteresis of 70 mV or greater

Substitute parts are grouped into two categories based on these parameters: Analog Devices MAX481 series variants (direct electrical equivalents with enhanced specifications) and MaxLinear SP3088 series (higher performance alternatives with extended data rate capability).

Parameter Comparison

Part Number	Manufacturer	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Product Status	RoHS Status	Package
DS481TM	Texas Instruments	2 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	Obsolete	Non-compliant	8-SOIC
MAX481CSA+	Analog Devices Inc./Maxim	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	Active	ROHS3 Compliant	8-SOIC
MAX481CSA+T	Analog Devices Inc./Maxim	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	Active	ROHS3 Compliant	8-SOIC
MAX481ECSA+	Analog Devices Inc./Maxim	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	Active	ROHS3 Compliant	8-SOIC
MAX481ECSA+T	Analog Devices Inc./Maxim	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	Active	ROHS3 Compliant	8-SOIC
MAX481EESA+	Analog Devices Inc./Maxim	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	Active	ROHS3 Compliant	8-SOIC
MAX481EESA+T	Analog Devices Inc./Maxim	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	Active	ROHS3 Compliant	8-SOIC
MAX481ESA+	Analog Devices Inc./Maxim	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	Active	ROHS3 Compliant	8-SOIC
MAX481ESA+T	Analog Devices Inc./Maxim	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	Active	ROHS3 Compliant	8-SOIC
SP3088EEN-L	MaxLinear, Inc.	20 Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	100 mV	Active	ROHS3 Compliant	8-SOIC
SP3088EEN-L/TR	MaxLinear, Inc.	20 Mbps	4.5V ~ 5.5V	-40°C ~ 85°C	100 mV	Active	RoHS Compliant	8-SOIC

Engineering Selection Recommendations

For Industrial Temperature Range Applications (-40°C to 85°C):

MAX481EESA+ and MAX481EESA+T are direct functional equivalents with full temperature range support matching the DS481TM. Both parts are active products with ROHS3 compliance. The EESA+ variant is supplied in tube packaging, while EESA+T is supplied in cut tape and Digi-Reel format. These parts provide 2.5 Mbps data rate capability, exceeding the 2 Mbps requirement of the original part.

MAX481ESA+ and MAX481ESA+T similarly support the full -40°C to 85°C temperature range with identical electrical specifications. These variants are also available in tube (ESA+) and cut tape/Digi-Reel (ESA+T) packaging options.

SP3088EEN-L and SP3088EEN-L/TR provide enhanced performance with 20 Mbps data rate and extended supply voltage range (4.5V ~ 5.5V). Both support the full industrial temperature range and are active products with RoHS compliance.

For Restricted Temperature Range Applications (0°C to 70°C):

MAX481CSA+, MAX481CSA+T, MAX481ECSA+, and MAX481ECSA+T are suitable for applications with narrower temperature requirements. These parts maintain electrical compatibility with the DS481TM within their specified operating range and offer active product status with ROHS3 compliance.

Compliance Considerations:

All substitute parts listed are active products with RoHS compliance status, addressing the non-compliant status of the obsolete DS481TM. Selection should prioritize parts matching the required operating temperature range and packaging format for your production environment.

Frequently Asked Questions (FAQ)

Q: Can MAX481 series parts directly replace the DS481TM without circuit modifications?

A: Yes, MAX481 series parts maintain electrical compatibility within the specified parameters. The 8-SOIC package, RS422/RS485 protocol, half-duplex 1/1 configuration, and 70 mV receiver hysteresis are identical. Supply voltage and operating temperature ranges must be verified against your application requirements.

Q: What is the difference between MAX481EESA+ and MAX481ESA+ variants?

A: Both support the full -40°C to 85°C industrial temperature range and are electrically equivalent. The primary difference is internal die revision, with EESA+ representing a later generation. Both are active products with ROHS3 compliance and identical electrical specifications.

Q: Why does SP3088EEN-L have a higher data rate (20 Mbps) than the DS481TM (2 Mbps)?

A: The SP3088 is a higher-performance transceiver designed for applications requiring faster communication speeds. The 20 Mbps capability is backward compatible with 2 Mbps applications. The extended supply voltage range (4.5V ~ 5.5V) and higher receiver hysteresis (100 mV) provide additional design flexibility.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging (CSA+, ECSA+, ESA+, EEN-L) is suitable for lower-volume applications and manual assembly. Cut tape and Digi-Reel packaging (CSA+T, ECSA+T, ESA+T, EEN-L/TR) is optimized for automated pick-and-place assembly in high-volume production environments.

Q: Are all substitute parts RoHS compliant?

A: Yes, all listed substitute parts carry RoHS compliance certification (ROHS3 or RoHS Compliant status), addressing the non-compliant status of the obsolete DS481TM.

Q: Which substitute part should I select for a new design?

A: For new designs requiring full industrial temperature support (-40°C to 85°C), MAX481EESA+T or SP3088EEN-L/TR are recommended. Both are active products with RoHS compliance and tape & reel packaging suitable for automated assembly. MAX481EESA+T provides direct electrical equivalence, while SP3088EEN-L/TR offers enhanced performance headroom.

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