SN65ALS1176D Equivalent & Substitute Parts

Part Overview

The SN65ALS1176D is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device operates at 4.75V to 5.25V supply voltage with a 35Mbps data rate and 60mV receiver hysteresis, designed for industrial communication applications requiring half-duplex serial transmission.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN65ALS1176D
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Duplex Mode	Half
Number of Drivers/Receivers	1/1
Package / Case	8-SOIC (0.154", 3.90mm Width)
Data Rate	35Mbps
Voltage - Supply	4.75V ~ 5.25V
Receiver Hysteresis	60 mV
Operating Temperature	-25°C ~ 85°C
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN65ALS1176D is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol support: RS422 and/or RS485
Duplex mode: Half-duplex operation
Driver/Receiver configuration: 1/1 (single driver, single receiver)
Package type: 8-SOIC form factor
Supply voltage range: Must accommodate 4.75V to 5.25V operation
Data rate: Minimum 35Mbps capability

Secondary Considerations:

Receiver hysteresis tolerance
Operating temperature range
Product status (active vs. obsolete)
Packaging format (tube, tape & reel, cut tape)
Compliance certifications (RoHS3, REACH)

Substitute parts are grouped into two categories: direct pin-compatible replacements from Texas Instruments and functionally equivalent alternatives from other manufacturers that meet the electrical and mechanical requirements.

Parameter Comparison

Part Number	Manufacturer	Protocol	Duplex	Package	Data Rate	Supply Voltage	Receiver Hysteresis	Operating Temp	Product Status
SN65ALS1176D	Texas Instruments	RS422, RS485	Half	8-SOIC	35Mbps	4.75V ~ 5.25V	60 mV	-25°C ~ 85°C	Obsolete
SN65ALS1176DR	Texas Instruments	RS422, RS485	Half	8-SOIC	35Mbps	4.75V ~ 5.25V	60 mV	-25°C ~ 85°C	Active
HI-4853PSHF	Holt Integrated Circuits Inc.	RS422, RS485	Half	8-SOIC	20Mbps	3.15V ~ 5.5V	Not specified	-55°C ~ 175°C	Active
ISL3179EFBZ	Renesas Electronics	RS422, RS485	Half	8-SOIC	40Mbps	3V ~ 3.6V	28 mV	-40°C ~ 125°C	Active
ISL3179EIBZ	Renesas Electronics	RS422, RS485	Half	8-SOIC	40Mbps	3V ~ 3.6V	28 mV	-40°C ~ 125°C	Active
ISL3179EIBZ-T	Renesas Electronics	RS422, RS485	Half	8-SOIC	40Mbps	3V ~ 3.6V	28 mV	-40°C ~ 85°C	Active
ISL43485IBZ	Renesas Electronics	RS422, RS485	Half	8-SOIC	50Mbps	3V ~ 3.6V	50 mV	-40°C ~ 85°C	Active
ISL43485IBZ-T	Renesas Electronics	RS422, RS485	Half	8-SOIC	50Mbps	3V ~ 3.6V	50 mV	-40°C ~ 85°C	Active
ISL4485EIBZ	Renesas Electronics	RS422, RS485	Half	8-SOIC	20Mbps	4.5V ~ 5.5V	70 mV	-40°C ~ 85°C	Obsolete
ISL83483IBZ	Renesas Electronics	RS422, RS485	Half	8-SOIC	250kbps	3V ~ 3.6V	50 mV	-40°C ~ 85°C	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended for Existing Designs):

SN65ALS1176DR from Texas Instruments is the primary substitute. This part maintains identical electrical specifications (35Mbps data rate, 60mV receiver hysteresis, 4.75V to 5.25V supply voltage) and package configuration as the obsolete SN65ALS1176D. The only difference is product status (active vs. obsolete) and packaging format (tape & reel vs. tube). This part is suitable for direct substitution without design modification. Inventory availability is significantly higher (650,200 pcs) compared to the original part.

Tier 2 - Functional Equivalents (Supply Voltage Compatible):

HI-4853PSHF from Holt Integrated Circuits and ISL4485EIBZ from Renesas Electronics operate within overlapping supply voltage ranges that accommodate the SN65ALS1176D's 4.75V to 5.25V requirement. Both maintain half-duplex RS422/RS485 operation in 8-SOIC packages. HI-4853PSHF supports extended temperature range (-55°C to 175°C) and wider supply voltage tolerance (3.15V to 5.5V). ISL4485EIBZ is obsolete but provides 4.5V to 5.5V supply compatibility. Data rate specifications (20Mbps) are lower than the original part but remain suitable for many industrial applications.

Tier 3 - Low-Voltage Alternatives (Design Modification Required):

ISL3179 series (EFBZ, EIBZ, EIBZ-T) and ISL43485 series (IBZ, IBZ-T) from Renesas Electronics operate at 3V to 3.6V supply voltage, requiring circuit redesign if the original 5V supply is maintained. These parts offer superior performance characteristics: ISL3179 series provides 40Mbps data rate with 28mV receiver hysteresis, while ISL43485 series delivers 50Mbps data rate with 50mV hysteresis. All are active products with robust inventory availability. ISL83483IBZ operates at 250kbps and is suitable only for low-speed applications.

Compliance & Certification:

All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements. MSL ratings vary (1 to 3), with implications for moisture-sensitive storage and handling procedures during assembly.

Frequently Asked Questions (FAQ)

Q: Can SN65ALS1176DR be used as a direct drop-in replacement for SN65ALS1176D?

A: Yes. SN65ALS1176DR is electrically and mechanically identical to SN65ALS1176D. Both devices feature identical 35Mbps data rate, 60mV receiver hysteresis, 4.75V to 5.25V supply voltage, and 8-SOIC package. The primary difference is product status (active vs. obsolete) and packaging format (tape & reel vs. tube). No circuit modifications are required.

Q: What are the key differences between Texas Instruments and Renesas Electronics substitutes?

A: Texas Instruments SN65ALS1176DR maintains exact electrical specifications. Renesas Electronics ISL3179 and ISL43485 series offer higher data rates (40Mbps to 50Mbps) but require 3V to 3.6V supply voltage, necessitating circuit redesign if 5V operation is required. ISL4485EIBZ provides 4.5V to 5.5V compatibility but operates at reduced 20Mbps data rate.

Q: Are low-voltage Renesas parts (ISL3179, ISL43485) suitable for 5V systems?

A: No. ISL3179 and ISL43485 series are specified for 3V to 3.6V operation only. Using these parts in 5V systems without voltage regulation will cause device damage. Only HI-4853PSHF, ISL4485EIBZ, and SN65ALS1176DR support the original 4.75V to 5.25V supply range.

Q: What is the significance of packaging format differences (tube vs. tape & reel)?

A: Packaging format affects handling, storage, and assembly processes. Tube packaging is suitable for manual assembly and small-volume applications. Tape & reel and cut tape formats are optimized for automated pick-and-place assembly in high-volume production. Electrical performance is identical; selection depends on manufacturing process requirements.

Q: Does receiver hysteresis variation affect substitution compatibility?

A: Receiver hysteresis affects noise immunity and signal detection thresholds. The original SN65ALS1176D specifies 60mV hysteresis. Substitutes with lower hysteresis (ISL3179 at 28mV, ISL43485 at 50mV) provide improved noise rejection in clean environments but may require careful signal conditioning in noisy industrial settings. Higher hysteresis (ISL4485EIBZ at 70mV) provides greater noise tolerance but reduced sensitivity to weak signals.

Q: What is the impact of operating temperature range differences?

A: The original part operates -25°C to 85°C. Substitutes offer varying ranges: HI-4853PSHF extends to -55°C to 175°C for extreme environments, while ISL3179EIBZ-T and ISL43485IBZ-T limit to -40°C to 85°C. Selection depends on application environment. Extended temperature range parts provide design flexibility for harsh industrial conditions.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching regulatory requirements of the original SN65ALS1176D. Moisture sensitivity levels vary (MSL 1 to 3), affecting storage and handling procedures during assembly.

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