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DS485M RS422/RS485 Half-Duplex Transceiver Equivalent & Substitute Parts
Part Overview
The DS485M is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in 8-SOIC surface mount packaging. This part is classified as obsolete and operates within a 4.75V to 5.25V supply voltage range with a maximum data rate of 2.5Mbps. Due to its obsolete status, equivalent and substitute parts with active product status or improved specifications are necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | DS485M Value |
|---|---|
| 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 | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C |
| Receiver Hysteresis | 70 mV |
| Data Rate | 2.5Mbps |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility for the DS485M is determined by the following critical parameters:
- Protocol Compatibility: All substitute parts must support RS422 and RS485 protocols
- Duplex Configuration: Half-duplex operation is required
- Driver/Receiver Count: 1 driver and 1 receiver configuration
- Package Type: 8-SOIC surface mount package with 0.154" (3.90mm) width
- Supply Voltage Range: 4.75V to 5.25V nominal operation
- Mounting Type: Surface mount technology
- Operating Temperature Range: Minimum -40°C to 85°C coverage
Substitute parts are grouped by product status (Active, Obsolete, Last Time Buy) and packaging format (Tape & Reel, Cut Tape, Tube). Parts meeting all electrical and mechanical parameters are considered direct substitutes. Enhanced specifications such as higher data rates or improved receiver hysteresis represent functional upgrades within the same form factor.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Protocol | Duplex | Drivers/Receivers | Package | Supply Voltage | Temp Range | Data Rate | Receiver Hysteresis | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DS485M | Texas Instruments | Obsolete | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 85°C | 2.5Mbps | 70 mV | RoHS non-compliant |
| SN65ALS1176DR | Texas Instruments | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -25°C ~ 85°C | 35Mbps | 60 mV | ROHS3 Compliant |
| SN65ALS176D | Texas Instruments | Obsolete | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 85°C | 35Mbps | 60 mV | ROHS3 Compliant |
| SN65ALS176DR | Texas Instruments | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 85°C | 35Mbps | 60 mV | ROHS3 Compliant |
| SN65HVD485ED | Texas Instruments | Last Time Buy | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.5V ~ 5.5V | -40°C ~ 85°C | 10Mbps | 30 mV | ROHS3 Compliant |
| SN65LBC176ADR | Texas Instruments | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 85°C | 30Mbps | 50 mV | ROHS3 Compliant |
| SN65LBC176AQD | Texas Instruments | Obsolete | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 125°C | 30Mbps | 50 mV | ROHS3 Compliant |
| SN65LBC176AQDR | Texas Instruments | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | -40°C ~ 125°C | 30Mbps | 50 mV | ROHS3 Compliant |
| SN75LBC176AD | Texas Instruments | Obsolete | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | 30Mbps | 50 mV | ROHS3 Compliant |
| SN75LBC176ADR | Texas Instruments | Obsolete | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | 30Mbps | 50 mV | ROHS3 Compliant |
| LTC485CS8#PBF | Analog Devices Inc. | Active | RS422, RS485 | Half | 1/1 | 8-SOIC | 4.75V ~ 5.25V | 0°C ~ 70°C | — | 70 mV | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation for New Designs: SN65ALS176DR or SN65LBC176AQDR
Both parts are manufactured by Texas Instruments with Active product status and ROHS3 compliance. SN65ALS176DR offers the highest data rate (35Mbps) with a narrower operating temperature range (-25°C to 85°C). SN65LBC176AQDR provides an extended operating temperature range (-40°C to 125°C) with 30Mbps data rate, suitable for industrial applications requiring wider temperature coverage.
For Existing Designs Requiring Obsolete Part Replacement: SN65ALS176D or SN65LBC176AQD
These obsolete-status parts maintain full electrical and mechanical compatibility with the DS485M while offering improved data rates (35Mbps and 30Mbps respectively) and ROHS3 compliance. Both support the full -40°C to 85°C temperature range of the original part.
For Last-Time-Buy Scenarios: SN65HVD485ED
This part maintains half-duplex RS422/RS485 operation with -40°C to 85°C temperature coverage. The supply voltage range extends to 4.5V–5.5V, providing broader input tolerance. Data rate is 10Mbps with 30mV receiver hysteresis.
Cross-Manufacturer Alternative: LTC485CS8#PBF (Analog Devices Inc.)
This active-status part from Analog Devices matches the DS485M receiver hysteresis (70mV) and supply voltage specifications. Operating temperature range is 0°C to 70°C. ROHS3 compliant with unlimited moisture sensitivity level.
All recommended substitutes maintain the 8-SOIC surface mount package format and half-duplex 1/1 driver/receiver configuration, ensuring direct PCB compatibility without layout modifications.
Frequently Asked Questions (FAQ)
Q: Can SN65ALS176DR directly replace DS485M in existing designs?
A: Yes. Both parts share identical package geometry (8-SOIC), supply voltage range (4.75V–5.25V), and protocol support (RS422/RS485 half-duplex 1/1). The SN65ALS176DR offers improved specifications with 35Mbps data rate versus 2.5Mbps. The operating temperature range is narrower (-25°C to 85°C versus -40°C to 85°C), which must be verified against application requirements.
Q: What is the difference between SN65ALS176DR and SN65LBC176AQDR?
A: Both are active-status Texas Instruments parts in 8-SOIC packaging with identical supply voltage (4.75V–5.25V). SN65ALS176DR operates at -25°C to 85°C with 35Mbps data rate and 60mV receiver hysteresis. SN65LBC176AQDR operates at -40°C to 125°C with 30Mbps data rate and 50mV receiver hysteresis. Select SN65ALS176DR for maximum speed; select SN65LBC176AQDR for extended temperature range.
Q: Is LTC485CS8#PBF from Analog Devices compatible with DS485M?
A: Yes. The LTC485CS8#PBF matches the DS485M in package type (8-SOIC), supply voltage (4.75V–5.25V), protocol (RS422/RS485), duplex configuration (half), and receiver hysteresis (70mV). Operating temperature range is 0°C to 70°C, which is narrower than the DS485M. This part is suitable for commercial-grade applications within this temperature window.
Q: Why do some substitute parts have different packaging designations (Tape & Reel, Cut Tape, Tube)?
A: Packaging format affects order quantity and handling but does not change electrical or mechanical specifications. Tape & Reel (TR) packaging is standard for high-volume automated assembly. Cut Tape (CT) and Tube packaging accommodate lower-volume or manual assembly processes. All formats contain identical die and lead configurations within the 8-SOIC package.
Q: What does ROHS3 compliance mean for substitution?
A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. The DS485M is RoHS non-compliant. All recommended active-status substitutes are ROHS3 compliant, meeting modern environmental and regulatory standards for new product designs and manufacturing.
Q: Can I use SN75LBC176AD or SN75LBC176ADR as replacements?
A: These parts are obsolete-status with narrower operating temperature range (0°C to 70°C versus -40°C to 85°C). They are suitable only if your application operates within this commercial temperature window. Active-status alternatives such as SN65ALS176DR or SN65LBC176AQDR are preferred for new designs and long-term availability.
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