THVD1550DR

@@ -0,0 +1,52 @@+# THVD1550DR++**Texas Instruments** · RS-485 / RS-422 ICs · SOIC-8++THVD1550DR from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | R | output | Receive data output. Digital output that reflects the differential state of the A/B bus inputs when the receiver is enabled. |+| 2 | /RE | input | Receiver enable, active low. Has a 2 MΩ internal pull-up so the receiver defaults to disabled when the pin is left floating. |+| 3 | DE | input | Driver enable, active high. Has a 2 MΩ internal pull-down so the driver defaults to disabled (Hi-Z bus) when the pin is left floating. |+| 4 | D | input | Driver data input. Digital input whose logic level is transmitted differentially onto the A/B bus when the driver is enabled. |+| 5 | GND | power_in | Device ground reference (0 V). |+| 6 | A | bidirectional | RS-485 bus I/O port A (non-inverting, complementary to B). ±18-kV IEC 61000-4-2 ESD contact and ±25-kV air-gap protected differential bus line. |+| 7 | B | bidirectional | RS-485 bus I/O port B (inverting, complementary to A). ±18-kV IEC 61000-4-2 ESD contact and ±25-kV air-gap protected differential bus line. |+| 8 | VCC | power_in | 5-V supply. Recommended operating range 4.5 V to 5.5 V. Bypass with a 100 nF ceramic capacitor to GND close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `THVD1550DR`+- `THVD1550DRD`+- `THVD1550DRDGKR`+- `THVD1550DRDGK`++## CAD (KiCad official)++- Symbol: `THVD1550DR`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/thvd1550.pdf) (43 pp, sha256 `6548e9b62323185e`, 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/thvd1550dr-datasheet.pdf)

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