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DS485M/NOPB RS422/RS485 Half Duplex Transceiver Equivalent & Substitute Parts
Part Overview
The DS485M/NOPB is a half-duplex RS422/RS485 transceiver IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The DS485M/NOPB operates at 2.5 Mbps data rate with 70 mV receiver hysteresis and is designed for industrial communication applications requiring RS422 or RS485 protocol support.
Substiute Parts
Key Parameters
| Parameter | DS485M/NOPB |
|---|---|
| Manufacturer | Texas Instruments |
| Type | Transceiver Half Duplex |
| Protocol | RS422, RS485 |
| Number of Drivers/Receivers | 1/1 |
| Data Rate | 2.5 Mbps |
| Receiver Hysteresis | 70 mV |
| Voltage Supply | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C |
| Package/Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the DS485M/NOPB is determined by the following critical parameters:
- Protocol compatibility: RS422/RS485 half-duplex operation
- Electrical specifications: Supply voltage 4.75V ~ 5.25V, receiver hysteresis tolerance
- Package compatibility: 8-SOIC form factor with identical pin configuration
- Operating temperature range: Minimum -40°C support required
- Data rate capability: Minimum 2.5 Mbps operation
- Compliance: ROHS3 compliance and surface mount technology
Substitute parts are grouped into two categories: manufacturer-recommended alternatives from Texas Instruments with enhanced specifications, and direct equivalents from alternative manufacturers with matching electrical characteristics.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Data Rate | Receiver Hysteresis | Operating Temperature | Voltage Supply | Package |
|---|---|---|---|---|---|---|---|
| DS485M/NOPB | Texas Instruments | Obsolete | 2.5 Mbps | 70 mV | -40°C ~ 85°C | 4.75V ~ 5.25V | 8-SOIC |
| SN65ALS1176DR | Texas Instruments | Active | 35 Mbps | 60 mV | -25°C ~ 85°C | 4.75V ~ 5.25V | 8-SOIC |
| SN65ALS176D | Texas Instruments | Obsolete | 35 Mbps | 60 mV | -40°C ~ 85°C | 4.75V ~ 5.25V | 8-SOIC |
| SN65ALS176DR | Texas Instruments | Active | 35 Mbps | 60 mV | -40°C ~ 85°C | 4.75V ~ 5.25V | 8-SOIC |
| SN65HVD485ED | Texas Instruments | Last Time Buy | 10 Mbps | 30 mV | -40°C ~ 85°C | 4.5V ~ 5.5V | 8-SOIC |
| SN65LBC176ADR | Texas Instruments | Active | 30 Mbps | 50 mV | -40°C ~ 85°C | 4.75V ~ 5.25V | 8-SOIC |
| SN65LBC176AQD | Texas Instruments | Obsolete | 30 Mbps | 50 mV | -40°C ~ 125°C | 4.75V ~ 5.25V | 8-SOIC |
| SN65LBC176AQDR | Texas Instruments | Active | 30 Mbps | 50 mV | -40°C ~ 125°C | 4.75V ~ 5.25V | 8-SOIC |
| SN75LBC176AD | Texas Instruments | Obsolete | 30 Mbps | 50 mV | 0°C ~ 70°C | 4.75V ~ 5.25V | 8-SOIC |
| SN75LBC176ADR | Texas Instruments | Obsolete | 30 Mbps | 50 mV | 0°C ~ 70°C | 4.75V ~ 5.25V | 8-SOIC |
| LTC485CS8#PBF | Analog Devices Inc. | Active | Not specified | 70 mV | 0°C ~ 70°C | 4.75V ~ 5.25V | 8-SOIC |
Engineering Selection Recommendations
For new designs requiring RS422/RS485 half-duplex transceiver functionality, select from active product status parts to ensure long-term availability and manufacturing support. The SN65ALS176DR and SN65LBC176AQDR offer the best combination of active product status and full temperature range operation (-40°C ~ 85°C or -40°C ~ 125°C respectively), both maintaining ROHS3 compliance and 8-SOIC packaging compatibility.
The SN65ALS176DR provides the highest data rate capability at 35 Mbps with active status and standard temperature range. The SN65LBC176AQDR extends the upper operating temperature to 125°C while maintaining 30 Mbps data rate, suitable for industrial applications with elevated thermal requirements.
For applications with relaxed temperature requirements (0°C ~ 70°C), the LTC485CS8#PBF from Analog Devices Inc. offers an active status alternative with matching receiver hysteresis (70 mV) to the original DS485M/NOPB, though with unspecified data rate capability.
Parts with obsolete or last-time-buy status should be avoided for new production designs unless existing inventory constraints require their use.
Frequently Asked Questions (FAQ)
Q: Can SN65ALS176DR directly replace DS485M/NOPB in existing designs?
A: Yes, the SN65ALS176DR is pin-compatible in the 8-SOIC package and maintains RS422/RS485 protocol support with identical supply voltage range (4.75V ~ 5.25V). The higher data rate (35 Mbps vs. 2.5 Mbps) and lower receiver hysteresis (60 mV vs. 70 mV) represent performance improvements. However, the operating temperature range is reduced to -25°C ~ 85°C, which may not be suitable for applications requiring -40°C operation.
Q: What is the difference between SN65ALS176DR and SN65ALS176D?
A: Both parts share identical electrical specifications (35 Mbps data rate, 60 mV hysteresis, 4.75V ~ 5.25V supply). The primary difference is product status: SN65ALS176DR is active with cut tape and digi-reel packaging, while SN65ALS176D is obsolete with tube packaging. For new designs, SN65ALS176DR is the recommended choice.
Q: Why does SN65LBC176AQDR have a higher operating temperature range than DS485M/NOPB?
A: The SN65LBC176AQDR is rated to -40°C ~ 125°C, extending the upper limit to 125°C compared to the DS485M/NOPB's 85°C maximum. This extended range accommodates industrial applications with elevated ambient or junction temperatures. The part maintains ROHS3 compliance and 8-SOIC packaging.
Q: Is the LTC485CS8#PBF from Analog Devices a suitable substitute?
A: The LTC485CS8#PBF matches the receiver hysteresis (70 mV) and supply voltage range of the DS485M/NOPB with active product status. However, the operating temperature range is limited to 0°C ~ 70°C, which does not meet the -40°C minimum requirement of the original part. This substitute is suitable only for applications with relaxed temperature specifications.
Q: What packaging options are available for substitute parts?
A: All substitute parts maintain the 8-SOIC (0.154", 3.90mm Width) surface mount package for direct PCB compatibility. Packaging formats vary by part number: tape & reel (TR), cut tape with digi-reel (CT), and tube. Select the packaging format based on production volume and assembly requirements.
Q: Are all substitute parts ROHS3 compliant?
A: Yes, all listed substitute parts maintain ROHS3 compliance, matching the environmental and regulatory requirements of the original DS485M/NOPB.
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