component
SN65HVD78D
Public Made by Adomby adom
Texas Instruments RS-485 / RS-422 ICs, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSN65HVD78D
Texas Instruments · RS-485 / RS-422 ICs · SOIC-8
SN65HVD78D from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | R | output | Receive data output; logic high when differential bus input VID exceeds positive threshold and receiver is enabled (RE low). |
| 2 | RE | input | Receiver enable input, active-low; receiver is enabled when RE is logic low, disabled when high or open. |
| 3 | DE | input | Driver enable input, active-high; driver is enabled when DE is logic high, driver outputs go high-impedance when low or open. |
| 4 | D | input | Driver data input; determines the logic state of differential outputs A and B when driver is enabled (DE high). |
| 5 | GND | power_in | Ground; local device ground reference potential. |
| 6 | A | tri_state | Tri-state differential bus output/input complementary to B; driver output when transmitting, receiver input when listening, high-impedance when driver disabled. |
| 7 | B | tri_state | Tri-state differential bus output/input complementary to A; driver output when transmitting, receiver input when listening, high-impedance when driver disabled. |
| 8 | VCC | power_in | Power supply input; 3.3-V supply with recommended operating range 3.0 V to 3.6 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Interface |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
SN65HVD78D - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
sn65hvd78d-etched.step/sn65hvd78d-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn65hvd78d.step/sn65hvd78d.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (46 pp, sha256
34f5900786acbc46, retrieved 2026-09-26, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).