DS485TMX Equivalent & Substitute Parts

Part Overview

The DS485TMX is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments, housed in an 8-SOIC package. This interface IC is designed for industrial communication networks requiring robust half-duplex serial data transmission. The part is currently obsolete, making equivalent substitutes necessary for new designs and production continuity. Substitute parts must maintain electrical compatibility across protocol support, supply voltage, operating temperature range, and mechanical packaging to ensure direct replacement capability.

Key Parameters

Parameter	DS485TMX Specification
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Duplex Configuration	Half
Number of Drivers/Receivers	1/1
Receiver Hysteresis	70 mV
Data Rate	2.5 Mbps
Supply Voltage	4.75V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following critical parameters:

Primary Compatibility Criteria:

Protocol support: RS422 and RS485 half-duplex operation
Receiver hysteresis: 70 mV
Supply voltage range: 4.75V ~ 5.25V
Package type: 8-SOIC (0.154", 3.90mm Width)
Mounting type: Surface Mount
Number of drivers/receivers: 1/1 configuration

Secondary Considerations:

Data rate capability: minimum 2.5 Mbps
Operating temperature range: must support -40°C ~ 85°C or equivalent industrial range
RoHS compliance status for regulatory requirements

All substitute parts listed maintain the core electrical and mechanical specifications required for direct replacement in the DS485TMX application space. Variations in data rate capability (where higher than 2.5 Mbps) and RoHS compliance represent improvements over the original part and do not compromise compatibility.

Parameter Comparison

Part Number	Manufacturer	Protocol	Duplex	Drivers/Receivers	Hysteresis	Data Rate	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
DS485TMX	Texas Instruments	RS422, RS485	Half	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Obsolete	Non-compliant
LTC485IS8#PBF	Analog Devices Inc.	RS422, RS485	Half	1/1	70 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LTC485IS8#TRPBF	Analog Devices Inc.	RS422, RS485	Half	1/1	70 mV	—	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
MAX481ESA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	Half	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
MAX485ESA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	Half	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM485ARZ	UMW	RS422, RS485	Half	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	—
ADM485ARZ-REEL	Analog Devices Inc.	RS422, RS485	Half	1/1	70 mV	5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM485EARZ	Analog Devices Inc.	RS422, RS485	Half	1/1	70 mV	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ADM485JRZ	Analog Devices Inc.	RS422, RS485	Half	1/1	70 mV	5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
ADM485JRZ-REEL	Analog Devices Inc.	RS422, RS485	Half	1/1	70 mV	5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
ADM485JRZ-REEL7	Analog Devices Inc.	RS422, RS485	Half	1/1	70 mV	5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Full Compatibility):

MAX485ESA+ and MAX481ESA+ from Analog Devices Inc./Maxim Integrated are the preferred direct replacements. Both maintain identical electrical specifications including 2.5 Mbps data rate, -40°C ~ 85°C operating temperature range, and 8-SOIC packaging. Both are ROHS3 compliant and in active production status, ensuring long-term availability and supply chain stability.

ADM485EARZ from Analog Devices Inc. provides equivalent performance with 2.5 Mbps data rate and full industrial temperature range (-40°C ~ 85°C). ROHS3 compliance and active status make this suitable for new designs requiring regulatory compliance.

Extended Temperature Range Substitutes:

ADM485ARZ-REEL and ADM485JRZ-REEL offer enhanced data rate capability (5 Mbps) while maintaining full industrial temperature support (-40°C ~ 85°C). These are suitable for applications requiring higher bandwidth headroom. Both are ROHS3 compliant and actively produced.

Commercial Temperature Range Alternatives:

ADM485ARZ, ADM485JRZ, and ADM485JRZ-REEL operate within 0°C ~ 70°C temperature range. These are appropriate for non-industrial environments where extended low-temperature operation is not required. ADM485JRZ variants offer 5 Mbps data rate capability.

LTC485 Series:

LTC485IS8#PBF and LTC485IS8#TRPBF from Analog Devices Inc. provide full protocol and electrical compatibility with ROHS3 compliance and active production status. These are available in both tube and cut tape packaging options.

Regulatory Compliance Consideration:

The original DS485TMX is RoHS non-compliant. All listed substitutes except ADM485ARZ are ROHS3 compliant, meeting modern regulatory requirements for new product designs and manufacturing.

Frequently Asked Questions (FAQ)

Q: Can MAX485ESA+ directly replace DS485TMX in existing designs?

A: Yes. MAX485ESA+ maintains identical electrical specifications: RS422/RS485 half-duplex protocol, 1/1 driver/receiver configuration, 70 mV receiver hysteresis, 2.5 Mbps data rate, 4.75V ~ 5.25V supply voltage, and -40°C ~ 85°C operating temperature. The 8-SOIC package is mechanically and electrically compatible. Pin-for-pin replacement is possible.

Q: What is the difference between LTC485IS8#PBF and LTC485IS8#TRPBF?

A: Both parts are electrically identical. The difference is packaging format: LTC485IS8#PBF is supplied in tube packaging, while LTC485IS8#TRPBF is supplied in cut tape with Digi-Reel format. Selection depends on assembly process requirements and volume.

Q: Why do some substitutes list higher data rates (5 Mbps) than the original 2.5 Mbps?

A: Higher data rate capability represents an enhancement over the original specification. Parts such as ADM485ARZ-REEL and ADM485JRZ-REEL support 5 Mbps operation while remaining fully backward compatible with 2.5 Mbps applications. No design modification is required; the higher capability is available if needed.

Q: Are there temperature range limitations I should consider?

A: The original DS485TMX operates from -40°C ~ 85°C. Most substitutes maintain this range. ADM485ARZ, ADM485JRZ, and ADM485JRZ-REEL operate within 0°C ~ 70°C. These are suitable only for commercial temperature environments. For industrial applications requiring full -40°C ~ 85°C operation, select MAX485ESA+, MAX481ESA+, ADM485EARZ, or ADM485ARZ-REEL.

Q: Is RoHS compliance important for my application?

A: RoHS compliance is mandatory for products sold in the European Union and increasingly required by major OEMs globally. The original DS485TMX is RoHS non-compliant. All substitutes except ADM485ARZ are ROHS3 compliant. For new designs, ROHS3-compliant parts are recommended to meet current regulatory standards.

Q: Can I use LTC485IS8 series parts as substitutes?

A: Yes. LTC485IS8#PBF and LTC485IS8#TRPBF are fully compatible substitutes. Both maintain RS422/RS485 protocol support, 1/1 configuration, 70 mV hysteresis, 4.75V ~ 5.25V supply voltage, and -40°C ~ 85°C operating temperature. ROHS3 compliance and active production status ensure regulatory compliance and supply continuity.

Q: What packaging options are available for substitutes?

A: Substitutes are available in multiple packaging formats: tube (standard reel packaging for manual assembly), cut tape with Digi-Reel (automated assembly), and standard reel formats. Selection depends on manufacturing process. All maintain the same 8-SOIC mechanical footprint.

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