SN75ALS176P Equivalent & Substitute Parts

Part Overview

The SN75ALS176P 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 support. The SN75ALS176P provides single driver and receiver functionality with 60 mV receiver hysteresis, operating within a 4.75V to 5.25V supply voltage range and 0°C to 70°C temperature range.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75ALS176P
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex	Half
Receiver Hysteresis	60 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 SN75ALS176P is determined by the following critical parameters:

Protocol compatibility: RS422/RS485 half-duplex transceiver
Driver/Receiver configuration: 1/1 (single driver, single receiver)
Supply voltage range: 4.75V ~ 5.25V
Package type: 8-DIP through-hole mounting
Receiver hysteresis: 60 mV (primary electrical characteristic)
Operating temperature range: 0°C ~ 70°C (minimum requirement)
RoHS3 compliance and REACH unaffected status

Substitute parts are categorized as follows:

MFR Recommended Substitutes: Parts with active product status, identical or superior electrical specifications, and full compliance certifications. These are preferred for new designs.

Parametric Equivalents: Parts with matching core electrical parameters but potentially different product status or extended temperature ranges. These provide functional equivalence with possible performance enhancements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Supply Voltage	Operating Temperature	Package	Mounting Type	Product Status
SN75ALS176P	Texas Instruments	RS422, RS485	1/1	Half	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Obsolete
SN65ALS176DR	Texas Instruments	RS422, RS485	1/1	Half	60 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-SOIC	Surface Mount	Active
ADM1485ANZ	Analog Devices Inc.	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active
ISL81487EIPZ	Renesas Electronics Corporation	RS422, RS485	1/1	Half	70 mV	4.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Through Hole	Active
LT1785ACN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Half	20 mV	4.75V ~ 5.25V	0°C ~ 70°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
LT1785CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Half	20 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
LTC485CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
LTC485IN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Half	70 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active
LTC1485CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	Half	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
SN75ALS176AP	Texas Instruments	RS422, RS485	1/1	Half	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Obsolete

Engineering Selection Recommendations

For Through-Hole 8-DIP Designs with Matching Temperature Range (0°C ~ 70°C):

LTC1485CN8#PBF is the primary parametric equivalent, offering identical receiver hysteresis (60 mV), supply voltage range, operating temperature, and package configuration with active product status and full RoHS3 compliance.

LT1785CN8#PBF and LT1785ACN8#PBF provide functional equivalence with tighter receiver hysteresis (20 mV) and active product status, suitable for applications requiring enhanced noise immunity.

LTC485CN8#PBF offers active product status with matching receiver hysteresis (70 mV) and identical electrical parameters, providing a direct alternative from Analog Devices.

For Extended Temperature Range Applications (-40°C ~ 85°C):

ADM1485ANZ from Analog Devices provides through-hole 8-DIP packaging with extended temperature range, 70 mV receiver hysteresis, and active product status.

LT1785AIN8#PBF offers extended temperature range with tighter receiver hysteresis (20 mV) and active product status.

LTC485IN8#PBF provides extended temperature range with 70 mV receiver hysteresis and active product status.

For Surface-Mount Designs:

SN65ALS176DR from Texas Instruments offers 8-SOIC surface-mount packaging with identical receiver hysteresis (60 mV), extended temperature range, and active product status. This requires PCB redesign for surface-mount assembly.

For Wider Supply Voltage Tolerance:

ISL81487EIPZ from Renesas provides 4.5V ~ 5.5V supply voltage range (versus 4.75V ~ 5.25V), extended temperature range, and through-hole 8-DIP packaging with active product status.

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use SN65ALS176DR as a direct replacement for SN75ALS176P?

A: SN65ALS176DR is functionally equivalent in electrical specifications (identical receiver hysteresis and supply voltage) but requires PCB redesign. The original part uses 8-DIP through-hole packaging, while SN65ALS176DR uses 8-SOIC surface-mount packaging. Pin assignments differ between package types.

Q: What is the difference between 60 mV and 70 mV receiver hysteresis?

A: Receiver hysteresis determines the voltage difference between the switching thresholds for logic high and low states. 60 mV hysteresis (SN75ALS176P, SN65ALS176DR, LTC1485CN8#PBF) provides the original specification. 70 mV hysteresis (ADM1485ANZ, ISL81487EIPZ, LTC485CN8#PBF, LTC485IN8#PBF) offers slightly wider noise margin. 20 mV hysteresis (LT1785 series) provides tighter threshold control for applications requiring enhanced signal discrimination.

Q: Why do some substitutes have extended temperature ranges (-40°C ~ 85°C)?

A: Extended temperature range parts are rated for broader operating conditions than the original SN75ALS176P (0°C ~ 70°C). These parts are suitable for industrial and automotive applications. If your design operates only within 0°C ~ 70°C, standard temperature range parts are sufficient.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status consistent with the original SN75ALS176P.

Q: What does "active" product status mean versus "obsolete"?

A: Active product status indicates the part is currently manufactured and supported by the supplier. Obsolete status indicates the part is no longer in production. All MFR Recommended Substitutes and Parametric Equivalents listed have active product status, ensuring long-term availability and supply chain reliability.

Q: Can I substitute LT1785 series parts for SN75ALS176P?

A: Yes. LT1785CN8#PBF, LT1785ACN8#PBF, and LT1785AIN8#PBF are functionally compatible. They maintain RS422/RS485 half-duplex 1/1 transceiver configuration, 8-DIP through-hole packaging, and 4.75V ~ 5.25V supply voltage. The primary difference is tighter receiver hysteresis (20 mV versus 60 mV), which enhances noise immunity in noisy environments.

Q: Is ISL81487EIPZ compatible with my existing PCB?

A: ISL81487EIPZ maintains 8-DIP through-hole packaging and pin compatibility. The key difference is expanded supply voltage range (4.5V ~ 5.5V versus 4.75V ~ 5.25V) and extended operating temperature (-40°C ~ 85°C). It is a direct pin-compatible replacement suitable for existing through-hole designs.

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