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SN75ALS176D Equivalent & Substitute Parts
Part Overview
The SN75ALS176D is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is classified as obsolete, with 2000 units currently in stock. Due to its obsolete status, identifying equivalent and substitute parts is necessary for ongoing design support, production continuity, and long-term component availability planning.
Substiute Parts
Key Parameters
| Parameter | SN75ALS176D |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | SN75ALS176D |
| Product Status | Obsolete |
| Type | Transceiver |
| Protocol | RS422, RS485 |
| Duplex Configuration | Half |
| Number of Drivers/Receivers | 1/1 |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Voltage Supply Range | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C |
| Receiver Hysteresis | 60 mV |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the SN75ALS176D is determined by the following critical parameters:
Primary Compatibility Criteria:
- Protocol support: RS422 and/or RS485
- Duplex configuration: Half-duplex operation
- Driver/Receiver configuration: 1 driver / 1 receiver
- Package type: 8-SOIC surface mount
- Supply voltage range: Minimum 4.75V to 5.25V compatibility
- Receiver hysteresis: 60 mV nominal (±10 mV tolerance acceptable)
Secondary Considerations:
- Operating temperature range (extended range preferred for active parts)
- Data rate capability (must meet or exceed application requirements)
- Product status (active parts preferred for new designs)
- RoHS and REACH compliance status
Substitute parts are grouped into two categories: manufacturer-recommended direct replacements (active status preferred) and parametric equivalents (may include obsolete variants with identical electrical specifications).
Parameter Comparison
| Part Number | Manufacturer | Status | Protocol | Duplex | Drivers/Receivers | Package | Supply Voltage | Temp Range | Receiver Hysteresis | Data Rate |
|---|---|---|---|---|---|---|---|---|---|---|
| SN75ALS176D | Texas Instruments | Obsolete | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | 60 mV | — |
| SN65ALS176DR | Texas Instruments | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 85°C | 60 mV | 35 Mbps |
| SN75ALS176BD | Texas Instruments | Obsolete | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | 60 mV | — |
| ADM1485ARZ | Analog Devices Inc. | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 85°C | 70 mV | 30 Mbps |
| ADM1485ARZ-REEL | Analog Devices Inc. | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 85°C | 70 mV | 30 Mbps |
| ADM1485ARZ-REEL7 | Analog Devices Inc. | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 85°C | 70 mV | 30 Mbps |
| ADM485ARZ | UMW | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | 70 mV | 2.5 Mbps |
| ADM485ARZ-REEL | Analog Devices Inc. | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 85°C | 70 mV | 5 Mbps |
| HI-4853PSHF | Holt Integrated Circuits Inc. | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 3.15V ~ 5.5V | -55°C ~ 175°C | — | 20 Mbps |
| ISL3179EFBZ | Renesas Electronics Corporation | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 3V ~ 3.6V | -40°C ~ 125°C | 28 mV | 40 Mbps |
| ISL3179EIBZ | Renesas Electronics Corporation | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 3V ~ 3.6V | -40°C ~ 125°C | 28 mV | 40 Mbps |
Engineering Selection Recommendations
Tier 1: Direct Replacement (Preferred for Active Designs)
SN65ALS176DR is the primary recommended substitute. It maintains identical electrical specifications to the SN75ALS176D (60 mV receiver hysteresis, 4.75V–5.25V supply range, 1/1 half-duplex RS422/RS485 configuration) while offering active product status, extended operating temperature range (-40°C to 85°C), and documented 35 Mbps data rate capability. This part is manufactured by Texas Instruments and carries ROHS3 compliance with unlimited MSL rating.
Tier 2: Parametric Equivalents (Active Alternatives)
ADM1485ARZ, ADM1485ARZ-REEL, and ADM1485ARZ-REEL7 (Analog Devices Inc.) provide functional equivalence with 70 mV receiver hysteresis (10 mV variance from original specification), identical supply voltage range, and extended temperature operation. These parts are available in active status with high inventory levels (15,100–30,400 units). Data rate is specified at 30 Mbps, suitable for most RS422/RS485 applications.
ADM485ARZ-REEL (Analog Devices Inc.) offers similar parametric compatibility with 5 Mbps data rate specification and extended temperature range (-40°C to 85°C), appropriate for lower-speed communication protocols.
Tier 3: Extended-Range Alternatives
HI-4853PSHF (Holt Integrated Circuits Inc.) provides the widest operating temperature range (-55°C to 175°C) and expanded supply voltage tolerance (3.15V–5.5V), with 20 Mbps data rate capability. This part is suitable for industrial and harsh-environment applications requiring temperature extremes beyond standard specifications.
Tier 4: Low-Voltage Variants (Conditional Use)
ISL3179EFBZ and ISL3179EIBZ (Renesas Electronics Corporation) operate at reduced supply voltage (3V–3.6V) with 40 Mbps data rate and 28 mV receiver hysteresis. These parts are suitable only for systems designed for 3.3V operation and are not direct replacements for 5V-based designs.
All recommended substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part.
Frequently Asked Questions (FAQ)
Q: Can SN65ALS176DR be used as a direct drop-in replacement for SN75ALS176D?
A: Yes. Both parts share identical electrical specifications for receiver hysteresis (60 mV), supply voltage range (4.75V–5.25V), duplex configuration (half), and driver/receiver count (1/1). The primary difference is product status: SN65ALS176DR is active with extended temperature range (-40°C to 85°C) versus the obsolete SN75ALS176D (0°C to 70°C). Pin configuration and package dimensions are identical (8-SOIC).
Q: What is the significance of receiver hysteresis in transceiver selection?
A: Receiver hysteresis determines the voltage differential required to switch receiver output states, affecting noise immunity and signal integrity. The SN75ALS176D specifies 60 mV hysteresis. Substitutes with 70 mV hysteresis (ADM1485 series) provide slightly improved noise margin but remain functionally compatible. Substitutes with significantly lower hysteresis (ISL3179 series at 28 mV) are not recommended for direct replacement in noise-sensitive environments.
Q: Are ADM485ARZ and ADM1485ARZ interchangeable?
A: Both are Analog Devices half-duplex RS422/RS485 transceivers in 8-SOIC packages with identical supply voltage ranges and operating temperatures. The primary difference is data rate: ADM485ARZ is specified at 5 Mbps while ADM1485ARZ is specified at 30 Mbps. Selection depends on application bandwidth requirements. Both maintain 70 mV receiver hysteresis and are suitable for the SN75ALS176D application space.
Q: Why do some substitutes list different packaging designations (Tube vs. Cut Tape & Digi-Reel)?
A: Packaging designation refers to the supply format for procurement, not the component package itself. All listed substitutes use the same 8-SOIC physical package. Tube packaging is suitable for manual assembly or small-volume production. Cut Tape & Digi-Reel format is optimized for automated pick-and-place assembly and high-volume manufacturing. Electrical performance is identical regardless of supply format.
Q: Can ISL3179EIBZ replace SN75ALS176D in a 5V system?
A: No. ISL3179EIBZ operates at 3V–3.6V supply voltage and is not compatible with 5V systems. This part is suitable only for 3.3V logic designs. Attempting to operate it at 5V supply voltage will damage the device.
Q: What inventory considerations should guide substitute selection?
A: SN65ALS176DR offers the highest inventory availability (2,131 units) among Texas Instruments active parts. Analog Devices ADM1485ARZ-REEL provides the largest stock (30,400 units) across all manufacturers. For long-term production continuity, parts with active status and high inventory levels (ADM1485ARZ-REEL, ADM1485ARZ-REEL7, ADM485ARZ-REEL) are preferred over obsolete variants.
Q: Are all listed substitutes RoHS3 compliant?
A: Yes. All manufacturer-recommended substitutes carry ROHS3 compliance certification. REACH status is uniformly listed as REACH Unaffected across all parts, and all share EAR99 export classification with the original SN75ALS176D.
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