THVD1450 RS-485 Transceiver

@@ -0,0 +1,52 @@+# THVD1450++**Texas Instruments** · RS-485 Transceiver · SOIC-8++The THVD1450 is a 5 V half-duplex RS-485 transceiver built for reliable industrial communication. It offers a wide -20 V to 25 V common-mode range, IEC ESD protection on the bus pins, and supports up to 256 nodes, making it a durable physical layer for Modbus and other multidrop networks over long cables.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | R | output | Receive data output. CMOS-level digital output representing the demodulated differential state of the A/B bus lines. |+| 2 | RE | input | Receiver enable, active low. Internal 2-MΩ pull-up to VCC keeps the receiver disabled if left floating. |+| 3 | DE | input | Driver enable, active high. Internal 2-MΩ pull-down to GND keeps the driver disabled (bus high-Z) if left floating. |+| 4 | D | input | Driver data input. CMOS-level digital input; when the driver is enabled, D=high forces A>B and D=low forces B>A. |+| 5 | GND | power_in | Device ground reference for logic supply and bus common-mode. |+| 6 | A | bidirectional | RS-485/RS-422 differential bus I/O port A (non-inverting), complementary to B. Withstands ±18-kV IEC 61000-4-2 contact discharge and ±15-V common-mode. |+| 7 | B | bidirectional | RS-485/RS-422 differential bus I/O port B (inverting), complementary to A. Withstands ±18-kV IEC 61000-4-2 contact discharge and ±15-V common-mode. |+| 8 | VCC | power_in | 3.3-V to 5-V single supply (operating range 3 V to 5.5 V). Bypass locally with 100-nF ceramic to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Half-duplex RS-485 transceiver |+| Supply voltage | 4.5 V to 5.5 V |+| Data rate | Up to 500 kbps |+| Common-mode range | -20 V to 25 V |+| Bus protection | IEC 61000-4-2 ESD |+| Bus loading | Up to 256 nodes |+| Operating temperature | -40 C to 125 C |++## Ordering variants++- `THVD1450D`+- `THVD1450DGK`+- `THVD1450DRB`++## CAD (KiCad official)++- Symbol: `thvd1450.kicad_sym`+- Footprint: `thvd1450.kicad_mod`+- 3D model: SOIC-8 body from KiCad `Package_SO/SOIC-8_3.9x4.9mm_P1.27mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/thvd1450.pdf) (54 pp, sha256 `58ecc4cc07dd1d32`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/thvd1450-datasheet.pdf)

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