SN75176BD Equivalent & Substitute Parts

Part Overview

The SN75176BD is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The SN75176BD operates within a 4.75V to 5.25V supply voltage range with a receiver hysteresis of 50 mV and supports industrial communication protocols requiring half-duplex transceiver functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75176BD
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	50 mV
Voltage - Supply	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN75176BD is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS422/RS485 half-duplex transceiver
Number of Drivers/Receivers: 1/1 configuration
Duplex Mode: Half-duplex operation
Voltage Supply Range: 4.75V ~ 5.25V
Mounting Type: Surface Mount
Package Type: 8-SOIC or equivalent 8-pin surface mount package
RoHS Compliance: ROHS3 Compliant

Acceptable Variations:

Receiver Hysteresis: 50 mV (main part) to 70 mV (substitutes) — both values support RS422/RS485 protocol requirements
Operating Temperature Range: Extended ranges (-40°C ~ 85°C) are acceptable for applications requiring 0°C ~ 70°C operation
Data Rate: Variations in specified data rates do not disqualify substitutes when protocol and electrical parameters match
Packaging Format: Tube, Cut Tape (CT), or Digi-Reel® formats are interchangeable for component selection
Product Status: Active parts are preferred over obsolete parts for new designs

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Voltage Supply	Operating Temp	Package	Product Status
SN75176BD	Texas Instruments	RS422, RS485	1/1	Half	50 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Obsolete
SN75176BDR	UMW	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active
SN75176AD	Texas Instruments	RS422, RS485	1/1	Half	50 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Obsolete
SN75176ADG4	Texas Instruments	RS422, RS485	1/1	Half	50 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Obsolete
ADM1485ARZ	Analog Devices Inc.	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active
ADM1485ARZ-REEL	Analog Devices Inc.	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active
ADM1485ARZ-REEL7	Analog Devices Inc.	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active
ADM1485JRZ	Analog Devices Inc.	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active
ADM1485JRZ-REEL	Analog Devices Inc.	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active
ADM485ARZ	UMW	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Active
ADM485ARZ-REEL	Analog Devices Inc.	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Parametric Equivalents (Identical Electrical Characteristics): SN75176AD and SN75176ADG4 are direct parametric equivalents to the SN75176BD, maintaining identical receiver hysteresis (50 mV) and operating temperature range (0°C ~ 70°C). Both parts are obsolete, limiting their suitability for new production.

Active Substitutes with Extended Temperature Range: ADM1485ARZ, ADM1485ARZ-REEL, and ADM1485ARZ-REEL7 from Analog Devices Inc. are active products with extended operating temperature range (-40°C ~ 85°C), providing superior reliability for industrial applications. These parts feature 70 mV receiver hysteresis, which remains within RS422/RS485 protocol specifications.

Active Substitutes with Matching Temperature Range: ADM1485JRZ and ADM1485JRZ-REEL maintain the original 0°C ~ 70°C operating temperature range while offering active product status and 30 Mbps data rate specification. These parts are suitable for direct replacement in applications with standard industrial temperature requirements.

Alternative Manufacturers: SN75176BDR (UMW) and ADM485ARZ (UMW) provide active alternatives with ROHS3 compliance and MSL 1 rating. SN75176BDR maintains the UMW manufacturer lineage with 70 mV hysteresis. ADM485ARZ offers 2.5 Mbps data rate specification with active status.

Compliance Verification: All substitute parts maintain ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and REACH unaffected status, ensuring regulatory alignment with the original SN75176BD specification.

Frequently Asked Questions (FAQ)

Q: Can I use ADM1485ARZ as a direct replacement for SN75176BD? A: Yes. Both parts meet the critical substitution parameters: RS422/RS485 half-duplex transceiver, 1/1 driver/receiver configuration, 4.75V ~ 5.25V supply voltage, 8-SOIC package, and ROHS3 compliance. The ADM1485ARZ offers extended operating temperature range (-40°C ~ 85°C) and active product status, making it suitable for new designs.

Q: What is the difference between receiver hysteresis values of 50 mV and 70 mV? A: Both values are within acceptable RS422/RS485 protocol specifications. The 50 mV hysteresis (SN75176BD, SN75176AD, SN75176ADG4) provides tighter noise immunity thresholds, while 70 mV hysteresis (ADM1485 series, ADM485ARZ, SN75176BDR) offers slightly broader noise margin. Selection depends on application noise environment and signal integrity requirements.

Q: Are packaging format differences (Tube vs. Cut Tape/Digi-Reel) significant for component selection? A: Packaging format differences do not affect electrical or mechanical compatibility. Tube packaging is suitable for manual assembly and lower-volume production. Cut Tape (CT) and Digi-Reel® formats are optimized for automated pick-and-place assembly and higher-volume manufacturing. Select based on production process requirements.

Q: Why should I choose an active product over an obsolete equivalent? A: Active products ensure long-term supply chain availability, manufacturer support, and consistent quality control. Obsolete parts face potential discontinuation and limited inventory. For new designs, active substitutes such as ADM1485ARZ, ADM1485JRZ, or SN75176BDR provide production continuity and reduced supply risk.

Q: Is the extended temperature range of ADM1485ARZ (-40°C ~ 85°C) necessary if my application only requires 0°C ~ 70°C operation? A: Extended temperature range is not required for applications operating within 0°C ~ 70°C. However, it provides additional design margin and thermal headroom without performance penalty. ADM1485JRZ and ADM1485JRZ-REEL maintain the original 0°C ~ 70°C range while offering active status.

Q: Can I mix different substitute parts within the same design? A: All listed substitutes meet identical electrical and mechanical parameters for RS422/RS485 half-duplex transceiver functionality. Mixing different part numbers is acceptable from a functional standpoint, though design documentation should specify the approved part list for consistency and traceability.

Q: What does ROHS3 compliance mean for this component? A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitutes maintain ROHS3 compliance, ensuring regulatory alignment for industrial and commercial applications.

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