SN65175D Equivalent & Substitute Parts

Part Overview

The SN65175D is a 0/4 Receiver IC for RS422, RS423, and RS485 serial communication interfaces, manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as obsolete, with 1900 units available in current inventory. Due to its obsolete status, identifying functionally equivalent active alternatives is essential for new designs and ongoing system support. Substitute parts must maintain compatibility across electrical specifications, package dimensions, and communication protocol support to ensure seamless integration into existing or new applications.

Substiute Parts

SN65175D

Texas InstrumentsIn Stock: 1915SN65175D Datasheet

Current PartRFQ

SN65LBC175ADR

Texas InstrumentsIn Stock: 3102SN65LBC175ADR Datasheet

MFR RecommendedRFQ

DS3486M/NOPB

Texas InstrumentsIn Stock: 6122DS3486M/NOPB Datasheet

MFR RecommendedRFQ

DS3486MX/NOPB

Texas InstrumentsIn Stock: 1579DS3486MX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN65175D is determined by the following critical parameters:

Primary Compatibility Criteria:

• Package / Case: 16-SOIC (0.154", 3.90mm Width) — physical and electrical pin compatibility
• Mounting Type: Surface Mount — assembly process compatibility
• Number of Drivers/Receivers: 0/4 — functional channel configuration
• Voltage Supply Range: 4.75V ~ 5.25V — power supply compatibility
• Protocol Support: RS422, RS423, RS485 — communication standard compatibility

Secondary Considerations:

• Operating Temperature Range: Substitutes must support the required temperature envelope or a superset thereof
• Receiver Hysteresis: Variations are acceptable within the functional requirements of the application
• RoHS and Moisture Sensitivity compliance ensure regulatory and manufacturing process alignment

The three identified substitute parts (SN65LBC175ADR, DS3486M/NOPB, and DS3486MX/NOPB) meet the primary compatibility criteria. Differences in receiver hysteresis, data rate specifications, and operating temperature ranges are noted but do not preclude substitution when application requirements are satisfied.

Parameter Comparison

Engineering Selection Recommendations

SN65LBC175ADR is the primary recommended substitute. It maintains full protocol compatibility (RS422, RS423, RS485), matches the operating temperature range (-40°C ~ 85°C), and holds active product status. The part is available in higher inventory (3000 units) and offers a specified data rate of 50 Mbps. The receiver hysteresis of 40 mV is lower than the original 50 mV specification, which represents improved noise margin performance. This part is suitable for applications requiring extended temperature operation and full RS485 protocol support.

DS3486M/NOPB and DS3486MX/NOPB are secondary alternatives. Both parts are active and ROHS3 compliant. However, they support only RS422 and RS423 protocols, excluding RS485 compatibility. The operating temperature range is restricted to 0°C ~ 70°C, which may not satisfy applications requiring the full -40°C ~ 85°C envelope of the original part. The receiver hysteresis of 140 mV is significantly higher than the original specification. These parts are suitable only for applications limited to RS422/RS423 operation within the narrower temperature range.

All substitute parts maintain identical package dimensions (16-SOIC), supply voltage compatibility (4.75V ~ 5.25V), and surface mount assembly requirements, ensuring mechanical and electrical compatibility at the board level.

Frequently Asked Questions (FAQ)

Q: Can SN65LBC175ADR directly replace SN65175D in all applications?

A: SN65LBC175ADR is pin-compatible and functionally equivalent for applications using RS422, RS423, or RS485 protocols within the -40°C ~ 85°C temperature range. The lower receiver hysteresis (40 mV vs. 50 mV) provides improved noise immunity. No circuit modifications are required for direct substitution.

Q: Why do DS3486M/NOPB and DS3486MX/NOPB have limited protocol support?

A: These parts support RS422 and RS423 protocols only and do not include RS485 functionality. Applications requiring RS485 communication must use SN65LBC175ADR or confirm that the system operates exclusively on RS422/RS423 before selecting these alternatives.

Q: What is the impact of the restricted operating temperature range in DS3486 variants?

A: DS3486M/NOPB and DS3486MX/NOPB operate from 0°C ~ 70°C, compared to the original SN65175D range of -40°C ~ 85°C. Applications requiring operation below 0°C or above 70°C must use SN65LBC175ADR to maintain specification compliance.

Q: How does receiver hysteresis affect circuit performance?

A: Receiver hysteresis determines the voltage differential required to switch the output state, affecting noise immunity and signal integrity. SN65LBC175ADR (40 mV) provides tighter hysteresis than the original (50 mV), improving performance in noisy environments. DS3486 variants (140 mV) provide greater hysteresis, suitable for applications with significant signal degradation.

Q: Are all substitute parts available in the same packaging options?

A: SN65175D is supplied in Tube packaging. SN65LBC175ADR is available in Cut Tape (CT) & Digi-Reel® packaging. DS3486M/NOPB is supplied in Tube; DS3486MX/NOPB is available in Cut Tape (CT) & Digi-Reel®. Packaging selection depends on assembly volume and procurement requirements.

Q: Do all parts meet the same regulatory compliance standards?

A: All parts are ROHS3 compliant, REACH unaffected, and carry Moisture Sensitivity Level 1 (Unlimited). Compliance certifications are equivalent across all options, ensuring regulatory alignment for new designs and legacy system support.