SN75ALS176AP Equivalent & Substitute Parts

Part Overview

The SN75ALS176AP 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 SN75ALS176AP 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	SN75ALS176AP
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 SN75ALS176AP is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Protocol: RS422/RS485 half-duplex
Driver/Receiver Configuration: 1/1
Duplex Mode: Half
Receiver Hysteresis: 60 mV (primary criterion for direct equivalence)
Supply Voltage Range: 4.75V ~ 5.25V
Operating Temperature: 0°C ~ 70°C
Package Type: 8-DIP through-hole
RoHS3 Compliance

Substitute parts are categorized into two groups:

MFR Recommended Substitutes: Parts meeting all critical parameters with active product status, providing direct functional replacement with improved availability.

Parametric Equivalents: Parts matching core electrical specifications but with different product status or minor parameter variations, suitable for applications where the specific parameter deviation is acceptable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Protocol	Drivers/Receivers	Receiver Hysteresis	Supply Voltage	Operating Temperature	Package	Mounting Type	Product Status
SN75ALS176AP	Texas Instruments	RS422, RS485	1/1	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Obsolete
SN75ALS176BDR	Texas Instruments	RS422, RS485	1/1	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-SOIC	Surface Mount	Active
ISL81487EIPZ	Renesas Electronics Corporation	RS422, RS485	1/1	70 mV	4.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Through Hole	Active
LT1785ACN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	20 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
LT1785AIN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	20 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active
LT1785CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	20 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
LT1785IN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	20 mV	4.75V ~ 5.25V	-40°C ~ 85°C	8-DIP	Through Hole	Active
LTC1485CN8#PBF	Analog Devices Inc.	RS422, RS485	1/1	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Active
SN75ALS176BP	Texas Instruments	RS422, RS485	1/1	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Obsolete
SN75ALS176P	Texas Instruments	RS422, RS485	1/1	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Obsolete

Engineering Selection Recommendations

For Active Product Status Requirement:

The SN75ALS176BDR from Texas Instruments is the manufacturer-recommended substitute with active product status. It maintains identical electrical specifications (60 mV receiver hysteresis, 4.75V ~ 5.25V supply, 0°C ~ 70°C operating range) and identical protocol support. The primary difference is packaging: SN75ALS176BDR uses 8-SOIC surface-mount format instead of through-hole DIP. This substitute is appropriate for new PCB designs where surface-mount assembly is feasible.

For Through-Hole Mounting Requirement:

The LTC1485CN8#PBF from Analog Devices Inc. provides parametric equivalence with active product status and through-hole 8-DIP packaging. It matches the receiver hysteresis specification (60 mV) and all electrical parameters of the original part. This part is suitable for applications requiring through-hole mounting with active component availability.

The ISL81487EIPZ from Renesas Electronics Corporation offers through-hole 8-DIP packaging with active status. It features enhanced operating temperature range (-40°C ~ 85°C) and expanded supply voltage tolerance (4.5V ~ 5.5V), with a 70 mV receiver hysteresis specification. This part is appropriate for applications requiring extended temperature operation.

For Temperature-Extended Applications:

The LT1785AIN8#PBF and LT1785IN8#PBF from Analog Devices Inc. both provide -40°C ~ 85°C operating range with through-hole 8-DIP packaging and active product status. These parts feature 20 mV receiver hysteresis, which differs from the original specification but provides tighter input threshold control. Both maintain 4.75V ~ 5.25V supply voltage compatibility.

Compliance Consideration:

All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original SN75ALS176AP.

Frequently Asked Questions (FAQ)

Q: Can SN75ALS176BDR directly replace SN75ALS176AP in existing through-hole PCBs?

A: No. SN75ALS176BDR uses 8-SOIC surface-mount packaging, while SN75ALS176AP uses 8-DIP through-hole packaging. PCB redesign is required for this substitution. For through-hole compatibility, select LTC1485CN8#PBF or ISL81487EIPZ.

Q: What is the significance of receiver hysteresis differences between substitute parts?

A: Receiver hysteresis determines the input threshold differential for logic state transitions. The original SN75ALS176AP specifies 60 mV. Substitute parts with 20 mV hysteresis (LT1785 series) provide tighter input thresholds, while 70 mV (ISL81487EIPZ) provides wider thresholds. Selection depends on signal integrity requirements of the specific application.

Q: Are LT1785 series parts with 20 mV hysteresis compatible with SN75ALS176AP applications?

A: LT1785 series parts are electrically compatible for RS422/RS485 half-duplex communication with identical supply voltage and package specifications. The 20 mV hysteresis differs from the original 60 mV specification. Compatibility depends on whether the application's signal levels and noise margins accommodate the tighter threshold specification.

Q: Which substitute part offers the widest operating temperature range?

A: ISL81487EIPZ, LT1785AIN8#PBF, and LT1785IN8#PBF all support -40°C ~ 85°C operating range, compared to the original 0°C ~ 70°C specification. These parts are suitable for industrial and extended-temperature applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original SN75ALS176AP.

Q: What is the inventory status of substitute parts?

A: LTC1485CN8#PBF (2220 pcs), ISL81487EIPZ (2007 pcs), and LT1785 variants (2216-3600 pcs) maintain active inventory. SN75ALS176BDR has 7796 pcs available. Obsolete variants SN75ALS176BP and SN75ALS176P have limited remaining inventory (1607 and 22868 pcs respectively).

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