DS481TM/NOPB Equivalent & Substitute Parts

Part Overview

The DS481TM/NOPB is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This interface component operates at 2 Mbps data rate with a supply voltage range of 4.75V to 5.25V and supports industrial temperature range operation from -40°C to 85°C. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Key Parameters

Parameter	DS481TM/NOPB
Manufacturer	Texas Instruments
Protocol	RS422, RS485
Type	Transceiver Half Duplex
Number of Drivers/Receivers	1/1
Data Rate	2 Mbps
Receiver Hysteresis	70 mV
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DS481TM/NOPB is determined by strict adherence to the following electrical and mechanical parameters:

Critical Compatibility Parameters:

Protocol: RS422/RS485 half-duplex operation
Package: 8-SOIC form factor with identical pinout
Duplex Mode: Half-duplex configuration
Number of Drivers/Receivers: 1/1 configuration
Mounting Type: Surface mount

Allowable Parameter Variations:

Data Rate: Substitute parts may exceed 2 Mbps specification
Receiver Hysteresis: Substitute parts may differ from 70 mV
Supply Voltage Range: Substitute parts may have wider or equivalent ranges
Operating Temperature: Substitute parts may support extended or equivalent ranges
Product Status: Active or Last Time Buy parts are acceptable alternatives to obsolete status

All substitute parts listed maintain identical package geometry, pinout compatibility, and protocol support, ensuring direct functional replacement in existing circuit designs.

Parameter Comparison

Part Number	Manufacturer	Protocol	Data Rate	Receiver Hysteresis	Supply Voltage	Operating Temperature	Product Status	Inventory
DS481TM/NOPB	Texas Instruments	RS422, RS485	2 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	Obsolete	1220 Pcs
SN65HVD485ED	Texas Instruments	RS422, RS485	10 Mbps	30 mV	4.5V ~ 5.5V	-40°C ~ 85°C	Last Time Buy	2000 Pcs
MAX481CSA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	Active	3600 Pcs
MAX481CSA+T	Analog Devices Inc./Maxim Integrated	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	Active	1101 Pcs
MAX481ECSA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	Active	2300 Pcs
MAX481ECSA+T	Analog Devices Inc./Maxim Integrated	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	Active	9506 Pcs
MAX481EESA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	Active	5800 Pcs
MAX481EESA+T	Analog Devices Inc./Maxim Integrated	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	Active	3700 Pcs
MAX481ESA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	Active	1323 Pcs
MAX481ESA+T	Analog Devices Inc./Maxim Integrated	RS422, RS485	2.5 Mbps	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	Active	8536 Pcs
SP3088EEN-L	MaxLinear, Inc.	RS422, RS485	20 Mbps	100 mV	4.5V ~ 5.5V	-40°C ~ 85°C	Active	4298 Pcs

Engineering Selection Recommendations

Primary Substitutes for Industrial Temperature Range (-40°C to 85°C):

The MAX481EESA+ and MAX481EESA+T variants from Analog Devices Inc./Maxim Integrated provide the closest electrical and thermal match to the DS481TM/NOPB. Both maintain identical supply voltage range (4.75V ~ 5.25V), receiver hysteresis (70 mV), and extended operating temperature specification. These parts are in active production status with substantial inventory availability. The primary distinction between these variants is packaging format: MAX481EESA+ is supplied in tube packaging, while MAX481EESA+T is supplied in cut tape with Digi-Reel format.

Alternative Substitutes with Extended Temperature Support:

The MAX481ESA+ and MAX481ESA+T variants also support the full -40°C to 85°C operating range with identical electrical parameters. These parts differ only in packaging format from the EESA variants.

Secondary Substitutes with Reduced Temperature Range:

The MAX481CSA+, MAX481CSA+T, MAX481ECSA+, and MAX481ECSA+T variants operate within a reduced temperature range of 0°C to 70°C. These parts are suitable only for applications where the full industrial temperature range is not required. All maintain identical supply voltage and receiver hysteresis specifications.

High-Speed Alternative:

The SP3088EEN-L from MaxLinear, Inc. provides enhanced data rate capability (20 Mbps versus 2 Mbps) with full industrial temperature range support. This part is suitable for applications requiring higher bandwidth while maintaining RS422/RS485 protocol compatibility and 8-SOIC package form factor.

Texas Instruments Alternative:

The SN65HVD485ED from Texas Instruments offers Last Time Buy status with enhanced data rate (10 Mbps) and slightly wider supply voltage tolerance (4.5V ~ 5.5V). This part maintains full industrial temperature range operation.

All substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited) and REACH unaffected status, matching the compliance profile of the original DS481TM/NOPB.

Frequently Asked Questions (FAQ)

Q: Can MAX481 variants with 0°C to 70°C temperature range replace DS481TM/NOPB in industrial applications?

A: MAX481 variants rated for 0°C to 70°C operating temperature are not suitable for applications requiring full industrial temperature range operation (-40°C to 85°C). Use MAX481EESA+, MAX481EESA+T, MAX481ESA+, or MAX481ESA+T variants for industrial temperature specifications.

Q: What is the difference between MAX481EESA+ and MAX481EESA+T?

A: Both parts are electrically identical. The primary difference is packaging format: MAX481EESA+ is supplied in tube packaging, while MAX481EESA+T is supplied in cut tape with Digi-Reel format. Selection depends on assembly process requirements and inventory management preferences.

Q: Is the SP3088EEN-L a direct replacement for DS481TM/NOPB?

A: The SP3088EEN-L is mechanically and functionally compatible with identical 8-SOIC package geometry and RS422/RS485 protocol support. The primary difference is enhanced data rate capability (20 Mbps versus 2 Mbps). This part is suitable for applications where higher bandwidth is beneficial or required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance status with MSL rating of 1 (Unlimited), matching the environmental and regulatory compliance profile of the DS481TM/NOPB.

Q: What is the significance of receiver hysteresis variation among substitute parts?

A: Receiver hysteresis affects noise immunity and signal detection threshold. The DS481TM/NOPB specifies 70 mV hysteresis. Substitute parts with different hysteresis values (such as SN65HVD485ED at 30 mV or SP3088EEN-L at 100 mV) may exhibit different noise rejection characteristics. Verify hysteresis specifications against application requirements for noise-sensitive environments.

Q: Can I use SN65HVD485ED as a substitute despite Last Time Buy status?

A: SN65HVD485ED is available in current inventory (2000 Pcs) and maintains full industrial temperature range operation with enhanced data rate capability. Last Time Buy status indicates limited future availability. This part is suitable for immediate production needs but may not be available for long-term supply requirements.

Q: What supply voltage range variations exist among substitute parts?

A: The DS481TM/NOPB operates at 4.75V ~ 5.25V. Substitute parts maintain this range or offer wider tolerance: SN65HVD485ED and SP3088EEN-L support 4.5V ~ 5.5V. Wider supply voltage tolerance provides additional design flexibility for applications with variable power supply conditions.

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