SN75ALS176BP Equivalent & Substitute Parts

Part Overview

The SN75ALS176BP is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in 8-DIP through-hole packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SN75ALS176BP operates within a 4.75V to 5.25V supply range with a 60 mV receiver hysteresis specification, suitable for industrial serial communication applications requiring half-duplex transceiver functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75ALS176BP
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 eligibility for the SN75ALS176BP is determined by the following critical parameters:

Primary Substitution Criteria:

Protocol compatibility: RS422/RS485 half-duplex transceiver
Driver/Receiver configuration: 1/1 (single driver, single receiver)
Duplex mode: Half-duplex operation
Supply voltage range: 4.75V to 5.25V
Receiver hysteresis: 60 mV (preferred) or compatible alternative
Operating temperature range: 0°C to 70°C minimum
Package type: 8-DIP through-hole (primary) or 8-SOIC surface mount (alternative)
Compliance: ROHS3 compliant

Substitute parts are categorized as either manufacturer-recommended (active product status preferred) or parametric equivalents (matching electrical specifications). Surface-mount alternatives (8-SOIC) are listed separately due to mounting type differences.

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Duplex	Receiver Hysteresis	Supply Voltage	Operating Temp	Package	Mounting Type	Product Status
SN75ALS176BP	Texas Instruments	RS422, RS485	1/1	Half	60 mV	4.75V ~ 5.25V	0°C ~ 70°C	8-DIP	Through Hole	Obsolete
SN75ALS176BDR	Texas Instruments	RS422, RS485	1/1	Half	60 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
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
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
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
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
SN75ALS176P	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

Manufacturer-Recommended Active Substitutes:

SN75ALS176BDR (Texas Instruments) is the primary manufacturer-recommended substitute, offering identical electrical specifications to the SN75ALS176BP with active product status. The only difference is packaging format: 8-SOIC surface mount versus 8-DIP through hole. This substitute is suitable for new designs or production runs where PCB layout accommodates surface-mount components.

Through-Hole Alternatives (Active Status):

For applications requiring through-hole mounting, three categories of active substitutes are available:

LTC1485CN8#PBF (Analog Devices Inc.) provides parametric equivalence with matching 60 mV receiver hysteresis and identical electrical specifications. This part maintains full compatibility with the original SN75ALS176BP electrical interface.

LT1785 series parts (LT1785ACN8#PBF, LT1785CN8#PBF, LT1785IN8#PBF) from Analog Devices Inc. are active alternatives with different receiver hysteresis (20 mV) and data rate specifications (250 kbps). These parts are suitable for applications where tighter hysteresis tolerance is beneficial. The LT1785IN8#PBF variant extends operating temperature to -40°C to 85°C.

ISL81487EIPZ (Renesas Electronics Corporation) is an active through-hole substitute with extended operating temperature range (-40°C to 85°C) and slightly higher receiver hysteresis (70 mV). Supply voltage range is expanded to 4.5V to 5.5V, and data rate is specified at 5 Mbps.

Obsolete Alternatives (Not Recommended for New Designs):

SN75ALS176AP and SN75ALS176P are parametric equivalents with obsolete product status. These parts are electrically identical to the SN75ALS176BP but should not be selected for new production due to end-of-life status.

Frequently Asked Questions (FAQ)

Q: Can SN75ALS176BDR replace SN75ALS176BP directly?

A: SN75ALS176BDR is electrically equivalent with identical specifications. The primary difference is packaging: SN75ALS176BDR uses 8-SOIC surface-mount format while SN75ALS176BP uses 8-DIP through-hole format. Direct PCB substitution requires layout modification to accommodate the different package footprint.

Q: What is the difference between LTC1485CN8#PBF and LT1785CN8#PBF?

A: Both are Analog Devices Inc. RS422/RS485 half-duplex transceivers in 8-DIP through-hole packaging with identical supply voltage (4.75V to 5.25V) and operating temperature (0°C to 70°C). The key difference is receiver hysteresis: LTC1485CN8#PBF specifies 60 mV (matching SN75ALS176BP), while LT1785CN8#PBF specifies 20 mV with a defined data rate of 250 kbps.

Q: Is ISL81487EIPZ suitable for applications requiring extended temperature range?

A: Yes. ISL81487EIPZ operates from -40°C to 85°C, extending the lower and upper temperature limits compared to SN75ALS176BP (0°C to 70°C). Supply voltage range is also expanded to 4.5V to 5.5V. This part is suitable for industrial and automotive applications requiring wider temperature operation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original SN75ALS176BP environmental certification status.

Q: Can I use LT1785IN8#PBF in a design originally specified for SN75ALS176BP?

A: LT1785IN8#PBF is electrically compatible for RS422/RS485 half-duplex communication with matching supply voltage range (4.75V to 5.25V). The receiver hysteresis differs (20 mV versus 60 mV), and operating temperature extends to -40°C to 85°C. Compatibility depends on whether the application tolerates tighter hysteresis and benefits from extended temperature range.

Q: What is the inventory status of active substitutes?

A: SN75ALS176BDR has 7,796 units in stock. ISL81487EIPZ has 2,007 units. LT1785 series parts have combined inventory exceeding 7,900 units (LT1785ACN8#PBF: 2,332 units; LT1785CN8#PBF: 3,411 units; LT1785IN8#PBF: 2,216 units). LTC1485CN8#PBF has 2,220 units available.

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