SN65HVD1781DR

@@ -0,0 +1,49 @@+# SN65HVD1781DR++**Texas Instruments** · RS-485 / RS-422 ICs · SOIC-8++SN65HVD1781DR 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 | Receiver data output. CMOS-level output presenting the demodulated state of the differential bus (A vs B). Drives up to ±8 mA (VOH ≥ 2.4 V, VOL ≤ 0.4 V). |+| 2 | RE | input | Receiver enable, active low. Drive low (or tie to GND) to enable the receiver output R; drive high (or tie to VCC) to place R in high-impedance. Combine with DE=low for standby/low-power mode. |+| 3 | DE | input | Driver enable, active high. Drive high to enable the differential driver (A/B); drive low to place the driver outputs in high-impedance. Combine with RE=high for standby/low-power mode (ICC ≤ 1 µA). |+| 4 | D | input | Driver data input. CMOS logic input whose state (with DE=high) sets the differential polarity between bus pins A and B. VIH ≥ 2 V, VIL ≤ 0.8 V. |+| 5 | GND | power_in | Ground reference for the device. Connect to the system ground plane. |+| 6 | A | bidirectional | Non-inverting RS-485 bus I/O. Driver output or receiver input, complementary to B. Fault-protected to ±70 V and ±16 kV HBM ESD; withstands -7 V to +12 V common-mode in normal operation. |+| 7 | B | bidirectional | Inverting RS-485 bus I/O. Driver output or receiver input, complementary to A. Fault-protected to ±70 V and ±16 kV HBM ESD; withstands -7 V to +12 V common-mode in normal operation. |+| 8 | VCC | power_in | Positive supply. 3.15 V to 5.5 V recommended operating range (4.5 V to 5.5 V per Pin Functions table for full RS-485 compliance). Bypass locally with a 0.1 µF ceramic capacitor to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++- `SN65HVD1781DRDR`+- `SN65HVD1781DRD`+- `SN65HVD1781DRP`++## CAD (KiCad official)++- Symbol: `SN65HVD1781DR`+- 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/sn65hvd1781.pdf) (34 pp, sha256 `f8736dab94b48730`, 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/sn65hvd1781dr-datasheet.pdf)

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