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DS485TMX/NOPB Equivalent & Substitute Parts
Part Overview
The DS485TMX/NOPB is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This part is classified as obsolete, with 18,793 units currently in stock. Due to its obsolete status, identifying functionally equivalent active alternatives is essential for new designs and long-term supply chain planning. Substitute parts must maintain compatibility across electrical specifications, package dimensions, and protocol support while offering improved availability and active product status where applicable.
Substiute Parts
Key Parameters
| Parameter | DS485TMX/NOPB |
|---|---|
| Manufacturer | Texas Instruments |
| Type | Transceiver |
| Protocol | RS422, RS485 |
| Duplex Configuration | Half |
| Number of Drivers/Receivers | 1/1 |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Voltage Supply Range | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C |
| Data Rate | 2.5 Mbps |
| Receiver Hysteresis | 70 mV |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict adherence to the following criteria:
Primary Compatibility Requirements:
- Protocol support: RS422 and RS485 half-duplex operation
- Package: 8-SOIC (0.154", 3.90mm Width) surface mount
- Duplex mode: Half-duplex, 1 driver / 1 receiver configuration
- Supply voltage range: 4.75V ~ 5.25V nominal operation
- Mounting type: Surface mount
Secondary Compatibility Factors:
- Operating temperature range: Minimum -40°C support required
- RoHS3 compliance: All substitutes must maintain regulatory compliance
- Receiver hysteresis: Acceptable range 30 mV to 70 mV
- Data rate: Minimum 2.5 Mbps required; higher rates are acceptable
Substitute parts are grouped by product status (active vs. obsolete) and packaging format (Tape & Reel, Cut Tape, Tube). Active parts with higher data rates and extended temperature ranges provide enhanced design flexibility for new applications.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Protocol | Data Rate | Receiver Hysteresis | Operating Temp | Supply Voltage | Package | Packaging Format |
|---|---|---|---|---|---|---|---|---|---|
| DS485TMX/NOPB | Texas Instruments | Obsolete | RS422, RS485 | 2.5 Mbps | 70 mV | -40°C ~ 85°C | 4.75V ~ 5.25V | 8-SOIC | — |
| SN65ALS1176DR | Texas Instruments | Active | RS422, RS485 | 35 Mbps | 60 mV | -25°C ~ 85°C | 4.75V ~ 5.25V | 8-SOIC | Tape & Reel (TR) |
| SN65ALS176D | Texas Instruments | Obsolete | RS422, RS485 | 35 Mbps | 60 mV | -40°C ~ 85°C | 4.75V ~ 5.25V | 8-SOIC | Tube |
| SN65ALS176DR | Texas Instruments | Active | RS422, RS485 | 35 Mbps | 60 mV | -40°C ~ 85°C | 4.75V ~ 5.25V | 8-SOIC | Cut Tape (CT) & Digi-Reel® |
| SN65HVD485EDR | Texas Instruments | Active | RS422, RS485 | 10 Mbps | 30 mV | -40°C ~ 85°C | 4.5V ~ 5.5V | 8-SOIC | Cut Tape (CT) & Digi-Reel® |
| SN65LBC176ADR | Texas Instruments | Active | RS422, RS485 | 30 Mbps | 50 mV | -40°C ~ 85°C | 4.75V ~ 5.25V | 8-SOIC | Cut Tape (CT) & Digi-Reel® |
| SN65LBC176AQD | Texas Instruments | Obsolete | RS422, RS485 | 30 Mbps | 50 mV | -40°C ~ 125°C | 4.75V ~ 5.25V | 8-SOIC | Tube |
| SN65LBC176AQDR | Texas Instruments | Active | RS422, RS485 | 30 Mbps | 50 mV | -40°C ~ 125°C | 4.75V ~ 5.25V | 8-SOIC | Tape & Reel (TR) |
| SN75ALS176DR | Texas Instruments | Obsolete | RS422, RS485 | — | 60 mV | 0°C ~ 70°C | 4.75V ~ 5.25V | 8-SOIC | Cut Tape (CT) |
| SN75LBC176AD | Texas Instruments | Obsolete | RS422, RS485 | 30 Mbps | 50 mV | 0°C ~ 70°C | 4.75V ~ 5.25V | 8-SOIC | Tube |
| SN75LBC176ADR | Texas Instruments | Obsolete | RS422, RS485 | 30 Mbps | 50 mV | 0°C ~ 70°C | 4.75V ~ 5.25V | 8-SOIC | Cut Tape (CT) & Digi-Reel® |
Engineering Selection Recommendations
For Active Product Status with Full Temperature Range:
SN65ALS176DR and SN65LBC176AQDR are recommended as primary substitutes. Both are active products with ROHS3 compliance and support the full -40°C ~ 85°C operating range required by the original DS485TMX/NOPB specification. SN65ALS176DR offers the highest data rate (35 Mbps) with Tape & Reel packaging for high-volume production. SN65LBC176AQDR extends the upper temperature limit to 125°C, providing additional thermal margin for demanding applications.
For Active Product Status with Standard Temperature Range:
SN65HVD485EDR is an active alternative with extended supply voltage tolerance (4.5V ~ 5.5V) and full -40°C ~ 85°C support. This part is suitable for applications requiring voltage margin beyond the standard 4.75V ~ 5.25V specification.
For Obsolete Product Replacement:
SN65ALS176D and SN75LBC176AD maintain obsolete status but offer higher data rates (35 Mbps and 30 Mbps respectively) compared to the original 2.5 Mbps specification. These parts are available in limited quantities and should be considered only when active alternatives are unavailable.
Packaging Considerations:
Tape & Reel (TR) packaging is preferred for automated assembly and high-volume production. Cut Tape (CT) & Digi-Reel® packaging provides flexibility for mixed-volume orders. Tube packaging is suitable for manual assembly and low-volume applications.
Frequently Asked Questions (FAQ)
Q: Can SN65ALS1176DR be used as a direct replacement for DS485TMX/NOPB?
A: SN65ALS1176DR is electrically compatible with identical supply voltage (4.75V ~ 5.25V), protocol support (RS422/RS485), and package (8-SOIC). However, the operating temperature range is -25°C ~ 85°C, which does not meet the -40°C minimum requirement of the original part. Use SN65ALS176DR instead, which supports -40°C ~ 85°C.
Q: What is the difference between SN65ALS176DR and SN65LBC176AQDR?
A: Both are active products with 8-SOIC packages and full -40°C ~ 85°C support. SN65ALS176DR operates at 35 Mbps with 60 mV receiver hysteresis. SN65LBC176AQDR operates at 30 Mbps with 50 mV receiver hysteresis and extends the upper temperature limit to 125°C. Select based on data rate requirements and thermal operating conditions.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts maintain ROHS3 compliance, consistent with the original DS485TMX/NOPB specification.
Q: What packaging formats are available for active substitutes?
A: Active substitutes are available in Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® formats. Tape & Reel is optimized for automated pick-and-place assembly. Cut Tape & Digi-Reel® provides flexibility for mixed-volume procurement.
Q: Can SN75LBC176ADR be used in new designs?
A: SN75LBC176ADR is classified as obsolete and operates at 0°C ~ 70°C, which does not meet the -40°C minimum requirement. This part is not recommended for new designs. Use active alternatives such as SN65LBC176AQDR or SN65ALS176DR instead.
Q: What is the significance of receiver hysteresis in transceiver selection?
A: Receiver hysteresis determines the voltage differential required for signal transitions. The DS485TMX/NOPB specifies 70 mV. Substitute parts with lower hysteresis (30 mV to 60 mV) provide tighter noise margins and are functionally compatible. Higher hysteresis values are not acceptable.
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