component
ST485EXDR
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STMicroelectronics RS-485 / RS-422 ICs, SO-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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ST485EXDR
STMicroelectronics · RS-485 / RS-422 ICs · SO-8
ST485EXDR from STMicroelectronics, in a SO-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 | RO | output | Receiver output: with RE low it goes high when A-B ≥ +0.2 V and low when A-B ≤ -0.2 V, and it is high impedance when RE is high and DE is low (Table 4). |
| 2 | RE | input | Receiver output enable: the receiver is active when RE is low and RO is placed in high impedance when RE is high (Table 4); control input limits VIH 2.0 V min and VIL 0.8 V max (Table 7). |
| 3 | DE | input | Driver output enable: the driver outputs A and B are active when DE is high and go high impedance when DE is low (Table 3); control input limits VIH 2.0 V min and VIL 0.8 V max (Table 7). |
| 4 | DI | input | Driver input: with DE high, DI high drives A high and B low and DI low drives A low and B high (Table 3); input limits VIH 2.0 V min and VIL 0.8 V max (Table 7). |
| 5 | GND | power_in | Device ground; all voltages are referenced to this pin (Table 7 footnote 1). |
| 6 | A | bidirectional | Non-inverting receiver input and non-inverting driver output; receiver common-mode range is -7 V to 12 V and voltage rating is ±14 V (Tables 5 and 7). |
| 7 | B | bidirectional | Inverting receiver input and inverting driver output; receiver common-mode range is -7 V to 12 V and voltage rating is ±14 V (Tables 5 and 7). |
| 8 | VCC | power_in | Supply voltage: specified for 5 V ±5% operation, with an absolute maximum of 7 V (Tables 5 and 6). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SO-8 |
| Category | Interface |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
ST485EXDR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files:
st485exdr-etched.step/st485exdr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);st485exdr.step/st485exdr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (18 pp, sha256
fc67af9e126732a1, retrieved 2026-10-10, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(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).
# ST485EXDR
**STMicroelectronics** · RS-485 / RS-422 ICs · SO-8
ST485EXDR from STMicroelectronics, in a SO-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 | RO | output | Receiver output: with RE low it goes high when A-B ≥ +0.2 V and low when A-B ≤ -0.2 V, and it is high impedance when RE is high and DE is low (Table 4). |
| 2 | RE | input | Receiver output enable: the receiver is active when RE is low and RO is placed in high impedance when RE is high (Table 4); control input limits VIH 2.0 V min and VIL 0.8 V max (Table 7). |
| 3 | DE | input | Driver output enable: the driver outputs A and B are active when DE is high and go high impedance when DE is low (Table 3); control input limits VIH 2.0 V min and VIL 0.8 V max (Table 7). |
| 4 | DI | input | Driver input: with DE high, DI high drives A high and B low and DI low drives A low and B high (Table 3); input limits VIH 2.0 V min and VIL 0.8 V max (Table 7). |
| 5 | GND | power_in | Device ground; all voltages are referenced to this pin (Table 7 footnote 1). |
| 6 | A | bidirectional | Non-inverting receiver input and non-inverting driver output; receiver common-mode range is -7 V to 12 V and voltage rating is ±14 V (Tables 5 and 7). |
| 7 | B | bidirectional | Inverting receiver input and inverting driver output; receiver common-mode range is -7 V to 12 V and voltage rating is ±14 V (Tables 5 and 7). |
| 8 | VCC | power_in | Supply voltage: specified for 5 V ±5% operation, with an absolute maximum of 7 V (Tables 5 and 6). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SO-8 |
| Category | Interface |
| Pins | 8 |
## CAD (KiCad official)
- Symbol: `ST485EXDR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `st485exdr-etched.step` / `st485exdr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `st485exdr.step` / `st485exdr.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590910171906588672) (18 pp, sha256 `fc67af9e126732a1`, retrieved 2026-10-10, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (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).
[Datasheet PDF](docs/st485exdr-datasheet.pdf)