LMS485IM/NOPB Equivalent & Substitute Parts

Part Overview

The LMS485IM/NOPB is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device operates as a 1/1 driver/receiver configuration with a 2.5 Mbps data rate and 95 mV receiver hysteresis. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across electrical specifications, mechanical packaging, and protocol support to ensure direct replacement capability.

Key Parameters

Parameter	LMS485IM/NOPB
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Data Rate	2.5 Mbps
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LMS485IM/NOPB is determined by the following critical parameters:

Protocol Compatibility: All substitute parts must support RS422 and RS485 protocols
Configuration: 1/1 driver/receiver, half-duplex operation
Package: 8-SOIC surface mount package (0.154", 3.90mm Width)
Supply Voltage Range: Minimum 4.75V ~ 5.25V overlap required
Operating Temperature: Minimum -40°C ~ 85°C coverage required
Data Rate: Minimum 2.5 Mbps capability
Compliance: ROHS3 compliance and active product status preferred

Substitute parts are grouped into two categories based on electrical performance alignment:

Category A - Direct Electrical Alignment (4.75V ~ 5.25V Supply, -40°C ~ 85°C Operation): ADM485EARZ, ADM485EARZ-REEL7, ISL8483EIBZ, ISL8483EIBZ-T, ISL8485CBZ, ISL8485CBZ-T

Category B - Extended Performance (Wider Supply or Temperature Range): HI-4853PSHF (3.15V ~ 5.5V, -55°C ~ 175°C), ISL3179EFBZ-T (3V ~ 3.6V, -40°C ~ 125°C), ISL8485EABZ, ISL8485EABZ-T (4.5V ~ 5.5V, -40°C ~ 125°C)

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Data Rate	Supply Voltage	Operating Temp	Package	Product Status	RoHS Status
LMS485IM/NOPB	Texas Instruments	RS422, RS485	1/1	Half	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Obsolete	ROHS3
ADM485EARZ	Analog Devices Inc.	RS422, RS485	1/1	Half	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
ADM485EARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	Half	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
HI-4853PSHF	Holt Integrated Circuits Inc.	RS422, RS485	1/1	Half	20 Mbps	3.15V ~ 5.5V	-55°C ~ 175°C	8-SOIC	Active	ROHS3
ISL3179EFBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	Half	40 Mbps	3V ~ 3.6V	-40°C ~ 125°C	8-SOIC	Active	ROHS3
ISL8483EIBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Half	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
ISL8483EIBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	Half	250 kbps	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
ISL8485CBZ	Renesas Electronics Corporation	RS422, RS485	1/1	Half	5 Mbps	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	ROHS3
ISL8485CBZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	Half	5 Mbps	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	ROHS3
ISL8485EABZ	Renesas Electronics Corporation	RS422, RS485	1/1	Half	10 Mbps	4.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	ROHS3
ISL8485EABZ-T	Renesas Electronics Corporation	RS422, RS485	1/1	Half	10 Mbps	4.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement)

ADM485EARZ and ADM485EARZ-REEL7 from Analog Devices Inc. provide the closest electrical alignment to the LMS485IM/NOPB. Both maintain identical supply voltage range (4.75V ~ 5.25V), operating temperature range (-40°C ~ 85°C), and data rate (2.5 Mbps). Both are active products with ROHS3 compliance. The primary difference is packaging format: ADM485EARZ is supplied in Tube, while ADM485EARZ-REEL7 is supplied in Cut Tape & Digi-Reel format. Selection between these variants depends on procurement and assembly requirements.

Secondary Substitutes (Extended Performance)

ISL8485EABZ and ISL8485EABZ-T from Renesas Electronics Corporation offer extended operating temperature range (-40°C ~ 125°C) with higher data rate capability (10 Mbps) while maintaining compatible supply voltage (4.5V ~ 5.5V). These parts are suitable for applications requiring enhanced temperature performance. Packaging variants include Tube (ISL8485EABZ) and Tape & Reel (ISL8485EABZ-T).

HI-4853PSHF from Holt Integrated Circuits Inc. provides the widest operating envelope with supply voltage range of 3.15V ~ 5.5V and temperature range of -55°C ~ 175°C, along with significantly higher data rate (20 Mbps). This part is appropriate for applications requiring extreme environmental conditions.

Limited Compatibility Substitutes

ISL8483EIBZ and ISL8483EIBZ-T operate at reduced data rate (250 kbps) and narrower temperature range (0°C ~ 70°C), making them suitable only for applications with relaxed performance requirements. ISL8485CBZ and ISL8485CBZ-T similarly have restricted temperature range (0°C ~ 70°C) and are not recommended for designs requiring full -40°C ~ 85°C coverage.

ISL3179EFBZ-T operates at 3V ~ 3.6V supply voltage, which does not overlap with the LMS485IM/NOPB specification and is not suitable as a direct substitute.

All substitute parts maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can ADM485EARZ directly replace LMS485IM/NOPB in existing designs?

A: Yes. ADM485EARZ maintains identical electrical specifications including supply voltage (4.75V ~ 5.25V), operating temperature (-40°C ~ 85°C), data rate (2.5 Mbps), and 8-SOIC package. No circuit modifications are required for direct substitution.

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 & Digi-Reel format. Selection depends on assembly line requirements and procurement preferences.

Q: Why is ISL3179EFBZ-T not recommended as a substitute?

A: ISL3179EFBZ-T operates at 3V ~ 3.6V supply voltage, which does not overlap with the LMS485IM/NOPB requirement of 4.75V ~ 5.25V. This voltage incompatibility makes it unsuitable for direct replacement.

Q: Can I use ISL8485CBZ if my application only operates at room temperature?

A: ISL8485CBZ operates at 0°C ~ 70°C, which does not cover the full -40°C ~ 85°C range of the LMS485IM/NOPB. Use only if your specific application guarantees operation within 0°C ~ 70°C limits.

Q: What advantage does HI-4853PSHF offer over ADM485EARZ?

A: HI-4853PSHF provides extended operating temperature range (-55°C ~ 175°C) and wider supply voltage tolerance (3.15V ~ 5.5V), along with higher data rate (20 Mbps). These features are beneficial for applications requiring extreme environmental conditions or higher speed operation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring regulatory alignment with environmental and hazardous substance restrictions.

Q: What is the significance of receiver hysteresis differences between parts?

A: Receiver hysteresis values (ranging from 28 mV to 95 mV across the substitute list) affect noise immunity and signal integrity. The LMS485IM/NOPB specifies 95 mV hysteresis. Substitutes with lower hysteresis values may require careful signal integrity analysis in noise-sensitive applications.

Q: Can I mix packaging formats (Tube vs. Cut Tape & Digi-Reel) in production?

A: Yes. Tube and Cut Tape & Digi-Reel variants of the same part number are electrically identical. Mixing formats is acceptable if your assembly process can accommodate both packaging types.

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