LMS485CM/NOPB Equivalent & Substitute Parts

Part Overview

The LMS485CM/NOPB is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent substitute components necessary for new designs and ongoing production support. The LMS485CM/NOPB operates within a 4.75V to 5.25V supply range with a 2.5 Mbps data rate and is suitable for industrial communication applications requiring half-duplex serial protocols.

Key Parameters

Parameter	LMS485CM/NOPB
Manufacturer	Texas Instruments
Type	Transceiver Half-Duplex
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Data Rate	2.5 Mbps
Voltage Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Receiver Hysteresis	95 mV
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LMS485CM/NOPB is determined by strict compatibility across the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS422/RS485 half-duplex operation
Package: 8-SOIC form factor (0.154", 3.90mm Width)
Number of Drivers/Receivers: 1/1 configuration
Voltage Supply Range: Must encompass or match 4.75V ~ 5.25V
Data Rate: Must support minimum 2.5 Mbps
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Operating Temperature: May extend beyond 0°C ~ 70°C range
Receiver Hysteresis: May differ from 95 mV
Product Status: Active status preferred for long-term availability
Packaging Format: Tube, Cut Tape, or Digi-Reel acceptable

All substitute parts listed maintain identical protocol support, package geometry, and driver/receiver configuration. Voltage supply ranges and data rate capabilities meet or exceed the original specification.

Parameter Comparison

Part Number	Manufacturer	Protocol	Data Rate	Voltage Supply	Operating Temp	Package	Product Status	Receiver Hysteresis
LMS485CM/NOPB	Texas Instruments	RS422, RS485	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Obsolete	95 mV
ADM485EARZ	Analog Devices Inc.	RS422, RS485	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	70 mV
ADM485EARZ-REEL7	Analog Devices Inc.	RS422, RS485	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	70 mV
ADM485JRZ	Analog Devices Inc.	RS422, RS485	5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active	70 mV
HI-4853PSHF	Holt Integrated Circuits Inc.	RS422, RS485	20 Mbps	3.15V ~ 5.5V	-55°C ~ 175°C	8-SOIC	Active	Not specified
ISL3179EFBZ-T	Renesas Electronics Corporation	RS422, RS485	40 Mbps	3V ~ 3.6V	-40°C ~ 125°C	8-SOIC	Active	28 mV
ISL8483EIBZ	Renesas Electronics Corporation	RS422, RS485	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	70 mV
ISL8483EIBZ-T	Renesas Electronics Corporation	RS422, RS485	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	70 mV
ISL8485CBZ	Renesas Electronics Corporation	RS422, RS485	5 Mbps	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	70 mV
ISL8485CBZ-T	Renesas Electronics Corporation	RS422, RS485	5 Mbps	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	70 mV
ISL8485EABZ	Renesas Electronics Corporation	RS422, RS485	10 Mbps	4.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	70 mV

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match):

ADM485EARZ and ADM485EARZ-REEL7 from Analog Devices Inc. provide the most direct substitution path. Both maintain identical voltage supply range (4.75V ~ 5.25V) and data rate (2.5 Mbps) as the LMS485CM/NOPB. These parts are active products with extended operating temperature ranges (-40°C ~ 85°C), offering improved reliability for production environments. Both are ROHS3 compliant and carry identical REACH and ECCN classifications.

Alternative Substitutes (Extended Performance):

ISL8485CBZ and ISL8485CBZ-T from Renesas Electronics Corporation support 5 Mbps data rates with matching operating temperature range (0°C ~ 70°C). These parts operate within 4.5V ~ 5.5V supply range, which encompasses the original specification. Both are active products with ROHS3 compliance.

ADM485JRZ from Analog Devices Inc. offers 5 Mbps capability with identical voltage supply and temperature range matching the original part. This variant provides higher data rate performance within the same thermal envelope.

High-Performance Alternatives:

HI-4853PSHF from Holt Integrated Circuits Inc. supports 20 Mbps data rates with extended operating temperature range (-55°C ~ 175°C) and wider voltage supply tolerance (3.15V ~ 5.5V). This part is suitable for demanding industrial applications requiring enhanced thermal performance.

ISL8485EABZ from Renesas Electronics Corporation provides 10 Mbps capability with extended temperature range (-40°C ~ 125°C) and 4.5V ~ 5.5V supply compatibility.

Not Recommended for Direct Substitution:

ISL3179EFBZ-T operates at 3V ~ 3.6V supply voltage, which does not encompass the original 4.75V ~ 5.25V specification and is unsuitable for 5V systems.

ISL8483EIBZ and ISL8483EIBZ-T support only 250 kbps data rate, which falls below the 2.5 Mbps requirement of the original part.

All recommended substitutes maintain ROHS3 compliance, REACH unaffected status, and EAR99 ECCN classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use ISL3179EFBZ-T as a substitute for LMS485CM/NOPB?

A: No. The ISL3179EFBZ-T operates at 3V ~ 3.6V supply voltage, which does not overlap with the LMS485CM/NOPB requirement of 4.75V ~ 5.25V. This part is designed for 3.3V systems and is not compatible with 5V applications.

Q: What is the difference between ADM485EARZ and ADM485EARZ-REEL7?

A: Both parts are electrically identical. The difference is packaging format: ADM485EARZ is supplied in Tube packaging, while ADM485EARZ-REEL7 is supplied in Cut Tape and Digi-Reel format. Selection depends on assembly process requirements and inventory management preferences.

Q: Why do some substitutes have lower data rates than the original part?

A: ISL8483EIBZ and ISL8483EIBZ-T support 250 kbps, which is below the 2.5 Mbps specification. These parts are not suitable substitutes for the LMS485CM/NOPB and should not be selected for applications requiring the original data rate capability.

Q: Can I use HI-4853PSHF in a standard 5V RS485 application?

A: Yes. HI-4853PSHF operates within 3.15V ~ 5.5V supply range, which encompasses standard 5V systems. The extended voltage tolerance and higher data rate (20 Mbps) make it suitable for 5V applications with enhanced performance margin.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and carry identical REACH unaffected status and EAR99 ECCN classification as the original LMS485CM/NOPB.

Q: What is the significance of receiver hysteresis differences?

A: Receiver hysteresis affects noise immunity and signal detection threshold. The LMS485CM/NOPB specifies 95 mV hysteresis. Most substitutes provide 70 mV hysteresis, which is acceptable for standard RS485 applications. ISL3179EFBZ-T provides 28 mV hysteresis for higher sensitivity applications, though this part is not recommended due to voltage supply incompatibility.

Q: Which substitute offers the best thermal performance?

A: HI-4853PSHF supports the widest operating temperature range (-55°C ~ 175°C), making it suitable for extreme environment applications. ISL8485EABZ and ADM485EARZ offer extended ranges (-40°C ~ 125°C and -40°C ~ 85°C respectively) for standard industrial use.

Q: Can I mix different substitute parts in the same design?

A: All listed substitutes maintain identical 8-SOIC package geometry and 1/1 driver/receiver configuration, allowing pin-compatible substitution. However, design validation should confirm voltage supply compatibility and data rate requirements for each application circuit.

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