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SN75ALS176ADRG4 Equivalent & Substitute Parts
Part Overview
The SN75ALS176ADRG4 is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates within a 4.75V to 5.25V supply voltage range with a 60 mV receiver hysteresis specification, suitable for industrial serial communication applications requiring half-duplex protocol support.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SN75ALS176ADRG4 |
| 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 | Surface Mount |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the SN75ALS176ADRG4 is determined by strict alignment of the following electrical and mechanical parameters:
Critical Matching Parameters:
- Protocol support: RS422 and RS485
- Duplex mode: Half-duplex operation
- Number of drivers/receivers: 1/1 configuration
- Package type: 8-SOIC form factor
- Mounting type: Surface mount
- Supply voltage compatibility: 4.75V ~ 5.25V or compatible range
- Operating temperature range: 0°C ~ 70°C or extended range
- Receiver hysteresis: 60 mV or equivalent specification
Substitute parts are grouped into two categories:
Category 1: Parametric Equivalents (Texas Instruments) Parts SN75ALS176ADR, SN75ALS176BDR, and SN75ALS176DR share identical electrical specifications and package configuration with the main part. These are direct functional replacements within the same product family.
Category 2: Manufacturer Recommended Alternatives (Renesas Electronics) Parts ISL3179EFBZ, ISL3179EIBZ, ISL3179EIBZ-T, ISL43485IBZ, ISL43485IBZ-T, ISL4485EIBZ, and ISL83483IBZ are manufacturer-recommended alternatives that meet the core functional requirements (RS422/RS485 half-duplex, 1/1 driver/receiver, 8-SOIC package) but operate within different supply voltage ranges and temperature specifications.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Duplex | Drivers/Receivers | Package | Supply Voltage | Operating Temp | Receiver Hysteresis | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| SN75ALS176ADRG4 | Texas Instruments | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | 60 mV | Discontinued |
| SN75ALS176ADR | Texas Instruments | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | 60 mV | Active |
| SN75ALS176BDR | Texas Instruments | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | 60 mV | Active |
| SN75ALS176DR | Texas Instruments | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | 60 mV | Obsolete |
| ISL3179EFBZ | Renesas Electronics | RS422, RS485 | Half | 1/1 | 8-SOIC | 3V ~ 3.6V | -40°C ~ 125°C | 28 mV | Active |
| ISL3179EIBZ | Renesas Electronics | RS422, RS485 | Half | 1/1 | 8-SOIC | 3V ~ 3.6V | -40°C ~ 125°C | 28 mV | Active |
| ISL3179EIBZ-T | Renesas Electronics | RS422, RS485 | Half | 1/1 | 8-SOIC | 3V ~ 3.6V | -40°C ~ 85°C | 28 mV | Active |
| ISL43485IBZ | Renesas Electronics | RS422, RS485 | Half | 1/1 | 8-SOIC | 3V ~ 3.6V | -40°C ~ 85°C | 50 mV | Active |
| ISL43485IBZ-T | Renesas Electronics | RS422, RS485 | Half | 1/1 | 8-SOIC | 3V ~ 3.6V | -40°C ~ 85°C | 50 mV | Active |
| ISL4485EIBZ | Renesas Electronics | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.5V ~ 5.5V | -40°C ~ 85°C | 70 mV | Obsolete |
| ISL83483IBZ | Renesas Electronics | RS422, RS485 | Half | 1/1 | 8-SOIC | 3V ~ 3.6V | -40°C ~ 85°C | 50 mV | Active |
Engineering Selection Recommendations
Primary Recommendation: SN75ALS176ADR The SN75ALS176ADR is the preferred substitute. It is an active product from Texas Instruments with identical electrical specifications and package configuration to the SN75ALS176ADRG4. This part maintains full compatibility with existing designs without requiring circuit modifications. Packaging is available in Cut Tape (CT) and Digi-Reel formats with 50,260 units in stock.
Secondary Recommendation: SN75ALS176BDR The SN75ALS176BDR offers identical specifications to the main part and is actively produced by Texas Instruments. This variant is suitable for applications where the primary recommendation is unavailable. Inventory availability is 7,796 units.
Alternative Recommendation: ISL3179EIBZ-T (Renesas Electronics) For applications requiring extended operating temperature range (-40°C to 85°C) and lower supply voltage operation (3V to 3.6V), the ISL3179EIBZ-T is a manufacturer-recommended alternative. This part is actively produced with 35,200 units in stock. Circuit design must accommodate the different supply voltage requirement. The receiver hysteresis specification (28 mV) differs from the original part (60 mV).
Alternative Recommendation: ISL43485IBZ-T (Renesas Electronics) The ISL43485IBZ-T supports extended temperature operation and operates at 3V to 3.6V supply voltage. This part features a 50 mV receiver hysteresis specification and is actively produced with 17,700 units in stock. Design compatibility with the lower supply voltage is required.
Not Recommended: ISL4485EIBZ This part is obsolete and should not be selected for new designs despite meeting core functional requirements.
Not Recommended: SN75ALS176DR This part is obsolete and should not be selected for new designs despite meeting core functional requirements.
All recommended substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the original part.
Frequently Asked Questions (FAQ)
Q: Can I directly replace SN75ALS176ADRG4 with SN75ALS176ADR without circuit modifications? A: Yes. The SN75ALS176ADR is a parametric equivalent with identical electrical specifications, supply voltage range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), receiver hysteresis (60 mV), and 8-SOIC package. No circuit modifications are required.
Q: What is the difference between the Texas Instruments SN75ALS176 variants (ADR, BDR, DR)? A: All three variants share identical electrical specifications and package configuration. The letter designation (A, B, or blank) indicates manufacturing date code or internal revision. SN75ALS176ADR and SN75ALS176BDR are active products, while SN75ALS176DR is obsolete.
Q: Can I use Renesas ISL3179EIBZ-T or ISL43485IBZ-T as direct replacements? A: These parts are functionally compatible for RS422/RS485 half-duplex communication but require circuit design review. The supply voltage requirement differs (3V ~ 3.6V versus 4.75V ~ 5.25V for the original part). Receiver hysteresis specifications also differ. Use these parts only if your circuit design can accommodate the lower supply voltage and different hysteresis characteristics.
Q: What does "half-duplex" mean in the context of these transceivers? A: Half-duplex operation means the transceiver can transmit or receive data, but not simultaneously. This is typical for RS422/RS485 bus architectures where multiple devices share a common communication line.
Q: Are all substitute parts RoHS3 compliant? A: Yes. All recommended substitute parts listed maintain ROHS3 compliance, consistent with the original SN75ALS176ADRG4.
Q: What is the significance of the "G4" suffix in SN75ALS176ADRG4? A: The "G4" suffix indicates the specific packaging and tape/reel configuration supplied by DiGi Electronics. The core part number is SN75ALS176ADR. Substitute parts may use different packaging designations (such as "-T" for tape and reel) but maintain functional equivalence.
Q: Can I use parts with different receiver hysteresis values? A: Receiver hysteresis affects noise immunity and signal detection thresholds. The original part specifies 60 mV. Renesas alternatives specify 28 mV, 50 mV, or 70 mV. Substitution with different hysteresis values requires circuit analysis to confirm compatibility with your specific noise environment and signal levels.
Q: What is the difference between tube and cut tape packaging? A: Tube packaging contains parts in a plastic tube suitable for manual handling and small-quantity applications. Cut tape and Digi-Reel packaging are suitable for automated assembly equipment. Both packaging types contain the same functional part; the difference is in handling and assembly method.
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