SN75176AP Equivalent & Substitute Parts

Part Overview

The SN75176AP is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-DIP through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The SN75176AP operates within a 4.75V to 5.25V supply voltage range with a 50 mV receiver hysteresis specification, designed for industrial communication applications requiring half-duplex serial data transmission.

Key Parameters

Parameter	SN75176AP Value
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	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the SN75176AP is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Protocol compatibility: RS422/RS485 half-duplex operation
Driver/Receiver configuration: 1/1 (single driver, single receiver)
Supply voltage range: 4.75V ~ 5.25V nominal operation
Package type: 8-DIP through-hole mounting for direct PCB compatibility
Receiver hysteresis: 50 mV specification tolerance

Secondary Considerations:

Product status: Active parts are preferred over obsolete classifications
RoHS3 compliance: All listed substitutes maintain regulatory compliance
Operating temperature range: Extended temperature variants available for specialized applications

Substitute parts are grouped into two categories: direct parametric equivalents (identical electrical specifications and through-hole packaging) and manufacturer-recommended alternatives (functionally equivalent with minor specification variations).

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Supply Voltage	Operating Temp	Package	Mounting Type	Product Status
SN75176AP	Texas Instruments	RS422, RS485	1/1	Half	50 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Obsolete
SN75176BP	Texas Instruments	RS422, RS485	1/1	Half	50 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
SN75176ADR	Texas Instruments	RS422, RS485	1/1	Half	50 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Surface Mount	Active
ISL81487EIPZ	Renesas Electronics	RS422, RS485	1/1	Half	70 mV	4.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Through Hole	Active
LT1785AIN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Half	20 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active
LT1785IN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Half	20 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active
MAX485CPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
MAX485EPA+	Analog Devices Inc./Maxim Integrated	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active

Engineering Selection Recommendations

Direct Parametric Equivalent (Recommended Primary Substitute): SN75176BP is the optimal substitute for SN75176AP. Both parts share identical electrical specifications (50 mV receiver hysteresis, 4.75V ~ 5.25V supply voltage, 0°C ~ 70°C operating range) and identical 8-DIP through-hole packaging. SN75176BP is manufactured by Texas Instruments with active product status and ROHS3 compliance, ensuring design continuity and supply chain reliability.

Surface Mount Alternative: SN75176ADR provides equivalent electrical performance in an 8-SOIC surface-mount package. This option is suitable for new PCB designs requiring surface-mount technology while maintaining Texas Instruments manufacturing and identical core specifications.

Extended Temperature Range Substitutes: MAX485EPA+ and LT1785AIN8#PBF/LT1785IN8#PBF offer extended operating temperature ranges (-40°C ~ 85°C) compared to the SN75176AP (0°C ~ 70°C). These parts maintain RS422/RS485 half-duplex 1/1 transceiver functionality with 8-DIP through-hole packaging and ROHS3 compliance. Selection depends on application temperature requirements.

Alternative Manufacturer Option: ISL81487EIPZ (Renesas Electronics) provides RS422/RS485 half-duplex transceiver functionality in 8-DIP through-hole packaging with extended temperature range (-40°C ~ 85°C) and wider supply voltage tolerance (4.5V ~ 5.5V). This part is suitable for applications requiring enhanced temperature performance or supply voltage margin.

All listed substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original SN75176AP specification.

Frequently Asked Questions (FAQ)

Q: Can SN75176BP directly replace SN75176AP without circuit modifications? A: Yes. SN75176BP is a parametric equivalent with identical electrical specifications and 8-DIP through-hole packaging. No circuit modifications are required for direct substitution.

Q: What is the difference between SN75176AP and SN75176ADR? A: The primary difference is packaging. SN75176AP uses 8-DIP through-hole mounting, while SN75176ADR uses 8-SOIC surface-mount packaging. Electrical specifications are identical. SN75176ADR is suitable for new surface-mount PCB designs.

Q: Why do some substitutes have different receiver hysteresis values? A: Receiver hysteresis (20 mV, 50 mV, or 70 mV) is a design parameter that affects noise immunity and signal detection sensitivity. Parts with different hysteresis values remain functionally compatible for RS422/RS485 communication but may exhibit different noise rejection characteristics. Selection should be based on application signal integrity requirements.

Q: Are extended temperature range parts (MAX485EPA+, LT1785AIN8#PBF) suitable for standard 0°C ~ 70°C applications? A: Yes. Extended temperature range parts operate correctly within standard temperature ranges. They are suitable for applications requiring either standard or extended temperature operation, providing design flexibility for future requirements.

Q: What is the significance of product status (Active vs. Obsolete)? A: Active parts have ongoing manufacturing support and supply chain availability. Obsolete parts have limited or no manufacturing support. For new designs and long-term production, active substitutes are recommended to ensure component availability and supply continuity.

Q: Can I use MAX485CPA+ instead of MAX485EPA+ in a design requiring -40°C ~ 85°C operation? A: No. MAX485CPA+ is rated for 0°C ~ 70°C operation only. For applications requiring -40°C ~ 85°C operation, MAX485EPA+ must be used to ensure compliance with temperature specifications.

Q: Are all listed substitutes ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with environmental and hazardous substance restrictions.

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