SN75LBC176ADR Equivalent & Substitute Parts

Part Overview

The SN75LBC176ADR is a half-duplex RS422/RS485 transceiver 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, suitable for industrial communication applications requiring half-duplex serial transmission.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75LBC176ADR
Manufacturer	Texas Instruments
Product Status	Obsolete
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	50 mV
Data Rate	30 Mbps
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN75LBC176ADR is determined by the following critical parameters:

Electrical Compatibility Requirements:

Protocol: RS422/RS485 half-duplex transceiver
Number of Drivers/Receivers: 1/1 configuration
Duplex Mode: Half-duplex operation
Supply Voltage Range: 4.75V ~ 5.25V (primary requirement for direct substitution)
Data Rate: Minimum 30 Mbps
Receiver Hysteresis: 50 mV (preferred for signal integrity)

Mechanical Compatibility Requirements:

Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Compliance Requirements:

RoHS3 Compliant
MSL: 1 (Unlimited) preferred for manufacturing flexibility

Substitute parts are categorized as follows:

MFR Recommended (Direct Replacement): SN65LBC176ADR - Active product status with identical electrical specifications and extended operating temperature range (-40°C ~ 85°C).

Parametric Equivalent: SN75LBC176DR - Same base product line with identical electrical parameters and obsolete status.

Upgrade Options: Parts with enhanced performance characteristics (higher data rates, extended temperature ranges, or improved receiver hysteresis) from Analog Devices, MaxLinear, and Renesas Electronics.

Parameter Comparison

Part Number	Manufacturer	Status	Protocol	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package
SN75LBC176ADR	Texas Instruments	Obsolete	RS422/RS485	30 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	50 mV	8-SOIC
SN65LBC176ADR	Texas Instruments	Active	RS422/RS485	30 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	50 mV	8-SOIC
SN75LBC176DR	Texas Instruments	Obsolete	RS422/RS485	30 Mbps	4.75V ~ 5.25V	0°C ~ 70°C	50 mV	8-SOIC
LTC1481IS8#PBF	Analog Devices Inc.	Active	RS422/RS485	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	45 mV	8-SOIC
LTC1481IS8#TRPBF	Analog Devices Inc.	Active	RS422/RS485	2.5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	45 mV	8-SOIC
SP485EN-L	MaxLinear, Inc.	Active	RS422/RS485	5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	10 mV	8-SOIC
SP485EN-L/TR	MaxLinear, Inc.	Active	RS422/RS485	5 Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	10 mV	8-SOIC
ISL3179EIBZ	Renesas Electronics	Active	RS422/RS485	40 Mbps	3V ~ 3.6V	-40°C ~ 125°C	28 mV	8-SOIC
ISL3179EIBZ-T	Renesas Electronics	Active	RS422/RS485	40 Mbps	3V ~ 3.6V	-40°C ~ 85°C	28 mV	8-SOIC
ISL43485IBZ	Renesas Electronics	Active	RS422/RS485	50 Mbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-SOIC
ISL43485IBZ-T	Renesas Electronics	Active	RS422/RS485	50 Mbps	3V ~ 3.6V	-40°C ~ 85°C	50 mV	8-SOIC

Engineering Selection Recommendations

For Direct Replacement (Recommended): SN65LBC176ADR is the primary substitute. It maintains identical electrical specifications and supply voltage requirements while offering active product status and extended operating temperature range. This part is suitable for designs requiring no circuit modifications.

For Active Product Requirement with 5V Supply: SP485EN-L or SP485EN-L/TR from MaxLinear provide active product status with 5V supply compatibility. These parts operate at lower data rates (5 Mbps) and reduced receiver hysteresis (10 mV), suitable for applications not requiring the full 30 Mbps bandwidth.

For Extended Temperature and Performance Requirements: ISL43485IBZ or ISL43485IBZ-T from Renesas Electronics offer the highest data rate (50 Mbps) and extended temperature range (-40°C ~ 85°C). However, these parts require 3V ~ 3.6V supply voltage, necessitating circuit redesign for voltage regulation.

For Parametric Equivalence: SN75LBC176DR provides identical electrical characteristics to the original part with the same obsolete status, suitable for legacy system maintenance.

All substitute parts maintain ROHS3 compliance and 8-SOIC package compatibility, ensuring mechanical interchangeability.

Frequently Asked Questions (FAQ)

Q: Can SN65LBC176ADR directly replace SN75LBC176ADR without circuit modifications? A: Yes. SN65LBC176ADR maintains identical supply voltage (4.75V ~ 5.25V), data rate (30 Mbps), receiver hysteresis (50 mV), and package specifications. The primary difference is extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C) and active product status.

Q: What is the key limitation of LTC1481IS8#PBF and LTC1481IS8#TRPBF as substitutes? A: These Analog Devices parts operate at significantly reduced data rate (2.5 Mbps versus 30 Mbps). They are suitable only for applications with lower bandwidth requirements. Supply voltage and package compatibility are maintained.

Q: Why do ISL3179EIBZ and ISL43485IBZ require circuit modifications? A: These Renesas parts operate on 3V ~ 3.6V supply voltage, incompatible with the original 4.75V ~ 5.25V requirement. Circuit redesign for voltage regulation is necessary. However, they offer superior performance (40-50 Mbps data rate) and extended temperature range (-40°C ~ 125°C for ISL3179EIBZ).

Q: Are all substitute parts available in the same packaging options? A: All substitute parts are available in 8-SOIC surface mount package. Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) differ by part number suffix. Verify packaging requirements for your procurement process.

Q: What is the significance of receiver hysteresis differences? A: Receiver hysteresis affects noise immunity and signal integrity. The original part specifies 50 mV. Substitutes with lower hysteresis (10-45 mV) provide tighter threshold margins, while those matching 50 mV maintain identical noise immunity characteristics.

Q: Which substitute offers the best long-term availability? A: SN65LBC176ADR from Texas Instruments carries active product status with 22,661 units in stock, providing the most reliable long-term supply. Renesas ISL series parts also maintain active status with substantial inventory levels.

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