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    AI Overview
    The
    SN65HVD78DR is a 3.3V, 20Mbps, half-duplex RS-485 transceiver in an 8-pin SOIC package manufactured by Texas Instruments.
    Replacement Options (Equivalent)
    You can replace the SN65HVD78DR with the following, which are functionally identical or pin-to-pin compatible from the same series:
    • SN65HVD78D: The same chip but in a tube rather than tape-and-reel.
    • SN65HVD75DR/SN65HVD72DR: These are part of the same TI family (SN65HVD7x), providing similar functionality (half-duplex, 3.3V) with different speed/slew-rate capabilities.
    • THVD1429/THVD1450: Modern pin-to-pin alternatives that offer higher surge and ESD protection.
    Where to Buy
    • DigiKey : Available for $2.87–$4.18, with options for VSON (DRB) or SOIC (D) packages.
    • Mouser Electronics: In stock for approximately $3.98.
    • Alternative Suppliers: Available on AliExpress and eBay, often listed in 10-piece sets for industrial repair.
    Technical Specifications for Replacement
    • Part Number: SN65HVD78DR (D suffix indicates SOIC package)
    • Package: SOIC-8 (8-pin)
    • Voltage: 3.3V
    • Type: Half-Duplex RS-485/RS-422 Transceiver
    Repair Advice
    When replacing, use flux to prevent damaging the pads on the board. The chip is a standard surface-mount (SOIC-8) component, making it manageable with hot air or fine-tip soldering irons.
    • SN65HVD78DR Texas Instruments | Mouser
      Alternative Packaging * Mfr. Part #: SN65HVD78D. * Packaging: Tube. * Availability: In Stock. * Price: $3.98. * Min:
      Mouser Electronics
    • 10pcs SN65HVD72DR SN65HVD75DR SN65HVD78DR ...
      With Escrow, your credit card details are never exposed. ... listed in Shipping & Packaging. ... 6 months Warranty. Buy with confi...
      AliExpress
    • 5PCS SN65HVD78DR SN65HVD78D TI IC TXRX RS485 3.3V ESD ...
      Price details * Was. $9.82. (12% off) -$1.18. * Item price. $8.64. Shipping. $9.20. * Estimated total. $17.84* You save: $1.18.
      eBay
    Show all
    • SN65HVD78DR Texas Instruments | Mouser
      Alternative Packaging * Mfr. Part #: SN65HVD78D. * Packaging: Tube. * Availability: In Stock. * Price: $3.98. * Min:
      Mouser Electronics
    • 10pcs SN65HVD72DR SN65HVD75DR SN65HVD78DR ...
      With Escrow, your credit card details are never exposed. ... listed in Shipping & Packaging. ... 6 months Warranty. Buy with confi...
      AliExpress
    • 5PCS SN65HVD78DR SN65HVD78D TI IC TXRX RS485 3.3V ESD ...
      Price details * Was. $9.82. (12% off) -$1.18. * Item price. $8.64. Shipping. $9.20. * Estimated total. $17.84* You save: $1.18.
      eBay
    • 227 | How To Replace QFN Chip on ECM - General Soldering ...
      Aug 13, 2025 — hello friends welcome back to the bench. thank you very much for joining me take a look at. this our patient is a uh what is it am...
      YouTube · Black Horse Repairs
      40:56
    • SN65HVD78DR Texas Instruments | Integrated Circuits (ICs) - DigiKey
      * Orders are typically delivered to India within 4 days depending on location. * UPS, FedEx or DHL freight pre-paid: CPT (Duty, cu...
      DigiKey
    • SN65HVD78 data sheet, product information and support
      Functional Block Diagram * THVD1429. ACTIVE. This product has been released to the market and is available for purchase. For some ...
      TI.com
    • SN65HVD7x EVM User's Guide - Texas Instruments
      Mar 15, 2012 — 5. Connect the power supply conductor with pin 3 of TB1 and observe the blue LED (D1) turning on. 6. Connect signal conductors fro...
      TI.com
    • 2Pcs SN65HVD78DR SOIC-8 RS-485 Interface IC 3.3V ... - eBay
      Picture 1 of 1. 1 of 1. Gallery. Picture 1 of 1. 2Pcs SN65HVD78DR SOIC-8 RS-485 Interface IC 3.3V-Supply RS-485. Enhancegear (6) $
      eBay
    • 10pcs New SN65HVD72DR SN65HVD75DR SN65HVD78DR ...
      Shipping: US $4.85 * Shipping: US $4.85. * Free shipping for orders over US $28.00. * Delivery: Jan 15 - 26.
      AliExpress
    • SN65HVD78DRBR Texas Instruments | Integrated Circuits (ICs)
      * SN65HVD78DRBT. IC TRANSCEIVER HALF 1/1 8SON. Texas Instruments. $4.18000. * SN65HVD78DR. IC TRANSCEIVER HALF 1/1 8SOIC. Texas In...
      DigiKey
    • 10 Pcs SN65HVD75DR Package SOIC-8 Half Duplex RS-485 ...
      10 Pcs SN65HVD75DR Package SOIC-8 Half Duplex RS-485 Transceiver Chip Original Stock Replacement for OEM New 2026 High for Reliabl...
      www.amazon.com
    • New Original SN65HVD78DR SN65HVD78D Silkscreen ...
      Enhance your electronic projects with the SN65HVD78DR SOP8 transceiver chip, a versatile HVD78 IC compatible component designed fo...
      www.aliexpress.com
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