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SN75ALS176BD RS422/RS485 Half Duplex Transceiver Equivalent & Substitute Parts
Part Overview
The SN75ALS176BD is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The SN75ALS176BD operates within a 4.75V to 5.25V supply voltage range with a 60 mV receiver hysteresis specification, designed for industrial communication applications requiring reliable half-duplex serial data transmission.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | SN75ALS176BD |
| Manufacturer | Texas Instruments |
| Type | Transceiver |
| Protocol | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 |
| Duplex Configuration | Half |
| Receiver Hysteresis | 60 mV |
| Voltage Supply Range | 4.75V ~ 5.25V |
| Operating Temperature Range | 0°C ~ 70°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the SN75ALS176BD is determined by strict adherence to the following electrical and mechanical parameters:
Primary Substitution Criteria:
- Protocol compatibility: RS422 and/or RS485 support
- Transceiver configuration: 1 driver / 1 receiver (half-duplex)
- Package type: 8-SOIC surface mount form factor
- Receiver hysteresis: 60 mV nominal specification
- Supply voltage range: 4.75V ~ 5.25V operation
- Operating temperature: 0°C ~ 70°C minimum coverage
Substitution Categories:
Category 1 - Direct Manufacturer Equivalent (Texas Instruments): SN75ALS176BDR represents the active production equivalent with identical electrical specifications and packaging, differentiated only by tape and reel packaging format.
Category 2 - Cross-Manufacturer Substitutes with Extended Specifications: Parts including HI-4853PSHF, ISL3179EIBZ-T, ISL43485IBZ-T, ISL4485EIBZ, and ISL83483IBZ-T meet or exceed the core electrical requirements while offering extended operating temperature ranges, higher data rates, or broader supply voltage compatibility. These parts maintain the 8-SOIC package footprint and half-duplex RS422/RS485 protocol support.
Category 3 - Functional Equivalents with Parameter Variations: ISL3179EFBZ and ISL3179EIBZ operate at reduced supply voltages (3V ~ 3.6V) and feature higher data rates (40 Mbps) with lower receiver hysteresis (28 mV), suitable for applications not requiring the 4.75V ~ 5.25V supply specification.
Parameter Comparison
| Part Number | Manufacturer | Protocol | Drivers/Receivers | Duplex | Package | Supply Voltage | Operating Temp | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| SN75ALS176BD | Texas Instruments | RS422, RS485 | 1/1 | Half | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | Obsolete | ROHS3 |
| SN75ALS176BDR | Texas Instruments | RS422, RS485 | 1/1 | Half | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | Active | ROHS3 |
| HI-4853PSHF | Holt Integrated Circuits Inc. | RS422, RS485 | 1/1 | Half | 8-SOIC | 3.15V ~ 5.5V | -55°C ~ 175°C | Active | ROHS3 |
| ISL3179EFBZ | Renesas Electronics | RS422, RS485 | 1/1 | Half | 8-SOIC | 3V ~ 3.6V | -40°C ~ 125°C | Active | ROHS3 |
| ISL3179EIBZ | Renesas Electronics | RS422, RS485 | 1/1 | Half | 8-SOIC | 3V ~ 3.6V | -40°C ~ 125°C | Active | ROHS3 |
| ISL3179EIBZ-T | Renesas Electronics | RS422, RS485 | 1/1 | Half | 8-SOIC | 3V ~ 3.6V | -40°C ~ 85°C | Active | ROHS3 |
| ISL43485IBZ | Renesas Electronics | RS422, RS485 | 1/1 | Half | 8-SOIC | 3V ~ 3.6V | -40°C ~ 85°C | Active | ROHS3 |
| ISL43485IBZ-T | Renesas Electronics | RS422, RS485 | 1/1 | Half | 8-SOIC | 3V ~ 3.6V | -40°C ~ 85°C | Active | ROHS3 |
| ISL4485EIBZ | Renesas Electronics | RS422, RS485 | 1/1 | Half | 8-SOIC | 4.5V ~ 5.5V | -40°C ~ 85°C | Obsolete | ROHS3 |
| ISL83483IBZ | Renesas Electronics | RS422, RS485 | 1/1 | Half | 8-SOIC | 3V ~ 3.6V | -40°C ~ 85°C | Active | ROHS3 |
| ISL83483IBZ-T | Renesas Electronics | RS422, RS485 | 1/1 | Half | 8-SOIC | 3V ~ 3.6V | -40°C ~ 85°C | Active | ROHS3 |
Engineering Selection Recommendations
Primary Recommendation - Direct Equivalent: SN75ALS176BDR is the preferred substitute, maintaining identical electrical specifications and supply voltage requirements as the obsolete SN75ALS176BD. This part is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating, ensuring long-term availability and supply chain stability.
Secondary Recommendations - Extended Operating Range: HI-4853PSHF provides the broadest operating temperature range (-55°C to 175°C) and extended supply voltage compatibility (3.15V ~ 5.5V), suitable for applications requiring enhanced thermal performance beyond the original specification.
Alternative Recommendations - Low Voltage Operation: ISL3179EIBZ-T, ISL43485IBZ-T, and ISL83483IBZ-T are active production parts from Renesas Electronics designed for 3V to 3.6V supply operation. These substitutes are appropriate for designs transitioning to lower supply voltages while maintaining RS422/RS485 protocol compliance and 8-SOIC packaging.
Compliance Consideration: All recommended substitutes maintain ROHS3 compliance status, ensuring regulatory alignment with current environmental standards. Parts designated as obsolete (ISL4485EIBZ) should be avoided for new designs despite functional equivalence.
Frequently Asked Questions (FAQ)
Q: Can SN75ALS176BDR be used as a direct replacement for SN75ALS176BD? A: Yes. SN75ALS176BDR is the active production equivalent with identical electrical specifications, supply voltage range (4.75V ~ 5.25V), operating temperature (0°C ~ 70°C), and 8-SOIC packaging. The only difference is packaging format (tape and reel versus tube).
Q: What is the primary difference between the SN75ALS176BD and Renesas ISL3179 series substitutes? A: The ISL3179 series operates at reduced supply voltages (3V ~ 3.6V) compared to the SN75ALS176BD (4.75V ~ 5.25V). The ISL3179 series also features higher data rates (40 Mbps) and lower receiver hysteresis (28 mV). These parts are suitable only for applications designed for 3V to 3.6V operation.
Q: Are all substitute parts available in the same 8-SOIC package? A: Yes. All listed substitute parts maintain the 8-SOIC (0.154", 3.90mm Width) surface mount package footprint, ensuring PCB layout compatibility without redesign.
Q: Which substitute offers the widest operating temperature range? A: HI-4853PSHF provides the extended operating temperature range of -55°C to 175°C, compared to the original SN75ALS176BD specification of 0°C to 70°C.
Q: Are there supply voltage compatibility concerns when substituting parts? A: Yes. The SN75ALS176BD requires 4.75V ~ 5.25V operation. Renesas ISL3179, ISL43485, and ISL83483 series parts operate at 3V ~ 3.6V and are not compatible with 5V-only supply designs. HI-4853PSHF supports 3.15V ~ 5.5V, providing broader compatibility.
Q: What is the significance of the "-T" suffix in part numbers like ISL3179EIBZ-T? A: The "-T" suffix indicates tape and reel packaging format, as opposed to tube packaging. Both formats contain identical die and electrical specifications; the difference is in delivery and handling format only.
Q: Should obsolete parts like ISL4485EIBZ be considered for new designs? A: No. Obsolete parts present supply chain risk and should not be selected for new product designs. Active production parts such as SN75ALS176BDR, HI-4853PSHF, or Renesas ISL series are preferred for design longevity.
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