SN75LBC176DR Equivalent & Substitute Parts

Part Overview

The SN75LBC176DR 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 and substitute parts necessary for new designs and ongoing production requirements. The device operates at 4.75V to 5.25V supply voltage with a 30 Mbps data rate and 50 mV receiver hysteresis, designed for industrial communication applications requiring half-duplex serial transmission.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75LBC176DR
Manufacturer	Texas Instruments
Product Category	Interface Transceiver
Protocol Support	RS422, RS485
Duplex Configuration	Half
Number of Drivers/Receivers	1/1
Data Rate	30 Mbps
Supply Voltage Range	4.75V ~ 5.25V
Operating Temperature Range	0°C ~ 70°C
Receiver Hysteresis	50 mV
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SN75LBC176DR is determined by strict alignment of the following critical parameters:

Protocol Support: RS422 and RS485 half-duplex operation Duplex Configuration: Half-duplex only Driver/Receiver Count: 1 driver and 1 receiver Package Type: 8-SOIC surface mount package with 0.154" width (3.90mm) Supply Voltage: 4.75V to 5.25V operating range Mounting Type: Surface mount technology

Substitute parts are grouped into two categories:

Manufacturer Recommended Substitutes: Parts from Texas Instruments and Analog Devices with active product status, extended temperature ranges, or improved specifications while maintaining full electrical and mechanical compatibility.

Parametric Equivalents: Parts with identical or near-identical electrical characteristics and the same package footprint, including obsolete variants that maintain full functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Protocol	Duplex	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package	Packaging Type
SN75LBC176DR	Texas Instruments	Obsolete	RS422, RS485	Half	30 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	50 mV	8-SOIC	Cut Tape & Digi-Reel
SN65LBC176DR	Texas Instruments	Active	RS422, RS485	Half	—	4.75V ~ 5.25V	-40°C ~ 85°C	50 mV	8-SOIC	Cut Tape & Digi-Reel
SN75LBC176ADR	Texas Instruments	Obsolete	RS422, RS485	Half	30 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	50 mV	8-SOIC	Cut Tape & Digi-Reel
ADM1485ARZ	Analog Devices Inc.	Active	RS422, RS485	Half	30 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	8-SOIC	Tube
ADM1485ARZ-REEL	Analog Devices Inc.	Active	RS422, RS485	Half	30 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	8-SOIC	Cut Tape & Digi-Reel
ADM1485ARZ-REEL7	Analog Devices Inc.	Active	RS422, RS485	Half	30 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	8-SOIC	Cut Tape & Digi-Reel
ADM1485JRZ	Analog Devices Inc.	Active	RS422, RS485	Half	30 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	8-SOIC	Tube
ADM1485JRZ-REEL	Analog Devices Inc.	Active	RS422, RS485	Half	30 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	8-SOIC	Cut Tape & Digi-Reel
ADM485ARZ	UMW	Active	RS422, RS485	Half	2.5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	8-SOIC	Cut Tape & Digi-Reel
ADM485ARZ-REEL	Analog Devices Inc.	Active	RS422, RS485	Half	5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	8-SOIC	Cut Tape & Digi-Reel
ADM485JRZ	Analog Devices Inc.	Active	RS422, RS485	Half	5 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	8-SOIC	Tube

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete SN75LBC176DR with active product status and extended operational temperature range, the SN65LBC176DR from Texas Instruments is the primary manufacturer recommendation. This part maintains identical receiver hysteresis (50 mV), supply voltage specifications, and package configuration while extending the operating temperature range to -40°C to 85°C.

For designs requiring 30 Mbps data rate capability with active product status, the ADM1485ARZ-REEL and ADM1485ARZ-REEL7 from Analog Devices provide full electrical and mechanical compatibility. These parts operate across -40°C to 85°C and are available in Cut Tape & Digi-Reel packaging for production environments.

For applications with identical operating temperature requirements (0°C to 70°C) and 30 Mbps data rate, the ADM1485JRZ and ADM1485JRZ-REEL variants from Analog Devices offer active product status with ROHS3 compliance and EAR99 export classification.

The SN75LBC176ADR serves as a parametric equivalent for applications where obsolete status is acceptable, maintaining identical electrical specifications and operating temperature range as the original part.

Lower data rate applications (2.5 Mbps to 5 Mbps) may utilize ADM485 series variants, which maintain full RS422/RS485 half-duplex compatibility and 8-SOIC package footprint. The ADM485ARZ-REEL supports extended temperature operation (-40°C to 85°C) with 5 Mbps capability.

All substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and identical 8-SOIC package dimensions (0.154", 3.90mm Width) for direct PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN65LBC176DR directly replace the SN75LBC176DR?

A: Yes. Both parts share identical receiver hysteresis (50 mV), supply voltage range (4.75V to 5.25V), and 8-SOIC package specifications. The SN65LBC176DR is active product status with extended operating temperature range (-40°C to 85°C) compared to the original part (0°C to 70°C).

Q: What is the difference between ADM1485ARZ and ADM1485JRZ?

A: Both are Analog Devices RS422/RS485 half-duplex transceivers in 8-SOIC packages with 30 Mbps data rate and 70 mV receiver hysteresis. The primary difference is operating temperature range: ADM1485ARZ operates -40°C to 85°C, while ADM1485JRZ operates 0°C to 70°C. Packaging options differ: ARZ is available in Tube, while JRZ is available in Tube. Both have Digi-Reel variants (ARZ-REEL, JRZ-REEL).

Q: Are ADM485 series parts suitable replacements?

A: ADM485 series parts maintain RS422/RS485 half-duplex protocol, 1/1 driver/receiver configuration, and 8-SOIC package compatibility. However, data rates are lower (2.5 Mbps to 5 Mbps) compared to the original 30 Mbps specification. Selection depends on application bandwidth requirements.

Q: What packaging options are available for production?

A: Cut Tape & Digi-Reel packaging is available for SN65LBC176DR, SN75LBC176ADR, ADM1485ARZ-REEL, ADM1485ARZ-REEL7, ADM1485JRZ-REEL, ADM485ARZ, ADM485ARZ-REEL, and ADM485JRZ. Tube packaging is available for ADM1485ARZ, ADM1485JRZ, and ADM485JRZ.

Q: Do all substitute parts meet RoHS compliance?

A: All listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All maintain identical supply voltage specifications (4.75V to 5.25V) and 8-SOIC package footprint for direct PCB compatibility.

Q: What is the receiver hysteresis difference between the original and Analog Devices substitutes?

A: The original SN75LBC176DR specifies 50 mV receiver hysteresis. Analog Devices ADM1485 and ADM485 series parts specify 70 mV receiver hysteresis. This higher hysteresis value provides improved noise immunity in industrial environments.

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