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SN75176ADRG4 Equivalent & Substitute Parts
Part Overview
The SN75176ADRG4 is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The device operates within a 4.75V to 5.25V supply voltage range and supports industrial communication protocols requiring robust noise immunity and reliable data transmission.
Substiute Parts
Key Parameters
| Parameter | SN75176ADRG4 |
|---|---|
| Manufacturer | Texas Instruments |
| Type | Transceiver |
| Protocol | RS422, RS485 |
| Duplex Mode | Half |
| Number of Drivers/Receivers | 1/1 |
| Receiver Hysteresis | 50 mV |
| Voltage Supply Range | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C |
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Discontinued at DiGi Electronics |
Substitute Part Grouping Explanation
Substitution eligibility for the SN75176ADRG4 is determined by the following critical parameters:
Primary Compatibility Criteria:
- Protocol support (RS422/RS485)
- Duplex mode (Half-duplex)
- Driver/Receiver configuration (1/1)
- Package type (8-SOIC)
- Receiver hysteresis (50 mV nominal)
Secondary Compatibility Considerations:
- Voltage supply range compatibility
- Operating temperature range
- Product status (Active preferred over Obsolete)
- RoHS and regulatory compliance
Substitutes are grouped into two categories:
Category A - Direct Pin-Compatible Substitutes (8-SOIC Half-Duplex): Parts maintaining identical package, duplex mode, and driver/receiver count with 50 mV hysteresis specification.
Category B - Functional Equivalents with Parameter Variations: Parts offering RS422/RS485 half-duplex operation in 8-SOIC but with different voltage ranges, hysteresis values, or data rates. These require design verification for voltage compatibility.
Parameter Comparison
| Part Number | Manufacturer | Duplex | Hysteresis (mV) | Voltage Supply | Temp Range | Data Rate | Package | Status |
|---|---|---|---|---|---|---|---|---|
| SN75176ADRG4 | Texas Instruments | Half | 50 | 4.75V ~ 5.25V | 0°C ~ 70°C | — | 8-SOIC | Discontinued |
| SN75176ADR | Texas Instruments | Half | 50 | 4.75V ~ 5.25V | 0°C ~ 70°C | — | 8-SOIC | Active |
| ISL3179EFBZ | Renesas Electronics | Half | 28 | 3V ~ 3.6V | -40°C ~ 125°C | 40Mbps | 8-SOIC | Active |
| ISL3179EIBZ | Renesas Electronics | Half | 28 | 3V ~ 3.6V | -40°C ~ 125°C | 40Mbps | 8-SOIC | Active |
| ISL3179EIBZ-T | Renesas Electronics | Half | 28 | 3V ~ 3.6V | -40°C ~ 85°C | 40Mbps | 8-SOIC | Active |
| ISL43485IBZ | Renesas Electronics | Half | 50 | 3V ~ 3.6V | -40°C ~ 85°C | 50Mbps | 8-SOIC | Active |
| ISL43485IBZ-T | Renesas Electronics | Half | 50 | 3V ~ 3.6V | -40°C ~ 85°C | 50Mbps | 8-SOIC | Active |
| ISL83483IBZ | Renesas Electronics | Half | 50 | 3V ~ 3.6V | -40°C ~ 85°C | 250kbps | 8-SOIC | Active |
| ISL83483IBZ-T | Renesas Electronics | Half | 50 | 3V ~ 3.6V | -40°C ~ 85°C | 250kbps | 8-SOIC | Active |
| ISL4485EIBZ | Renesas Electronics | Half | 70 | 4.5V ~ 5.5V | -40°C ~ 85°C | 20Mbps | 8-SOIC | Obsolete |
| ISL3180EIBZ | Renesas Electronics | Full | 28 | 3V ~ 3.6V | -40°C ~ 85°C | 40Mbps | 14-SOIC | Active |
Engineering Selection Recommendations
Recommended Primary Substitute: SN75176ADR
The SN75176ADR is the direct active equivalent from Texas Instruments. It maintains identical electrical specifications, package configuration, and operating parameters as the SN75176ADRG4. This part is currently in active production with 35,100 units in stock, ensuring supply continuity. Selection of this part eliminates design verification requirements and maintains full compatibility with existing PCB layouts and firmware implementations.
Alternative Substitutes for 3.3V System Designs:
For applications operating at 3.3V supply voltage, the ISL43485IBZ and ISL43485IBZ-T (Renesas Electronics) provide functional equivalence with matching 50 mV receiver hysteresis and half-duplex RS422/RS485 operation. Both parts are in active production status. The ISL43485IBZ-T variant in cut tape packaging offers higher inventory availability (17,700 units) compared to the tube-packaged ISL43485IBZ (7,746 units).
Not Recommended: ISL3180EIBZ
The ISL3180EIBZ operates in full-duplex mode with a 14-SOIC package, making it incompatible with designs requiring half-duplex operation and 8-SOIC form factor. This part is listed in the substitute database but does not meet the core functional requirements of the SN75176ADRG4.
Not Recommended: ISL4485EIBZ
The ISL4485EIBZ is marked as obsolete and should not be selected for new designs despite meeting some electrical parameters.
Frequently Asked Questions (FAQ)
Q: Can I use ISL3179EIBZ-T as a direct replacement for SN75176ADRG4?
A: The ISL3179EIBZ-T is functionally compatible for RS422/RS485 half-duplex communication in an 8-SOIC package. However, it operates at 3V to 3.6V supply voltage, whereas the SN75176ADRG4 requires 4.75V to 5.25V. Direct substitution is only possible if your system power supply is redesigned or if a voltage regulator is implemented. The receiver hysteresis differs (28 mV vs. 50 mV), which may affect noise immunity in electrically noisy environments.
Q: What is the difference between ISL43485IBZ and ISL43485IBZ-T?
A: Both parts are electrically identical with matching specifications. The primary difference is packaging: ISL43485IBZ is supplied in tube packaging, while ISL43485IBZ-T is supplied in cut tape with Digi-Reel format. Selection depends on your procurement and assembly process requirements. The cut tape variant has higher inventory availability.
Q: Why is ISL3180EIBZ listed as a substitute if it uses a different package?
A: The ISL3180EIBZ is included in the substitute database but is not a valid replacement for the SN75176ADRG4. It operates in full-duplex mode and uses a 14-SOIC package, making it incompatible with half-duplex designs and existing PCB layouts designed for 8-SOIC components.
Q: Can I use a part with lower receiver hysteresis (28 mV) instead of 50 mV?
A: Lower receiver hysteresis increases sensitivity to input signals but reduces noise immunity margins. Substitution with 28 mV hysteresis parts (ISL3179 series) is only appropriate if your application operates in low-noise environments with well-controlled signal integrity. High-noise industrial environments may require the 50 mV hysteresis specification of the original part.
Q: Is RoHS compliance maintained across all substitute parts?
A: All listed substitute parts maintain ROHS3 compliance status, matching the original SN75176ADRG4. Regulatory compliance is preserved across the substitution options.
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