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ST26C31BDR

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by adom

STMicroelectronics RS-485 / RS-422 ICs, SOIC-16. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs st26c31bdr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
package.json Publish 0.2.0 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json st26c31bdr: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body… · Ray
README.md st26c31bdr: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray
st26c31bdr-etched.fit.json st26c31bdr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
st26c31bdr-etched.glb st26c31bdr: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body… · Ray
st26c31bdr-etched.step st26c31bdr: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body… · Ray
st26c31bdr.glb Publish 0.1.0 · Ray
st26c31bdr.kicad_mod Publish 0.1.0 · Ray
st26c31bdr.kicad_sym Publish 0.1.0 · Ray
st26c31bdr.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
st26c31bdr.step Publish 0.1.0 · Ray

ST26C31BDR

STMicroelectronics · RS-485 / RS-422 ICs · SOIC-16

ST26C31BDR from STMicroelectronics, in a SOIC-16. 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 AIN input Channel A TTL/CMOS single-ended input. VIH >= 2 V, VIL <= 0.8 V. Drives the channel A differential output pair (AOUT / /AOUT).
2 AOUT output Channel A non-inverting differential (RS-422) output. 3-state; high impedance when enable inputs disable the driver. Drives balanced line loads (RL = 100 Ω typical).
3 /AOUT output Channel A inverting differential (RS-422) output (complement of AOUT). 3-state; high impedance when enable inputs disable the driver.
4 EN input Active-high enable input. Together with /EN (pin 12) enables all four channel outputs. When EN = L and /EN = H, all outputs are placed in high-impedance (Z) state.
5 /BOUT output Channel B inverting differential (RS-422) output (complement of BOUT). 3-state; high impedance when the driver is disabled.
6 BOUT output Channel B non-inverting differential (RS-422) output. 3-state; high impedance when the driver is disabled.
7 BIN input Channel B TTL/CMOS single-ended input. VIH >= 2 V, VIL <= 0.8 V. Drives the channel B differential output pair.
8 GND power_in Device ground reference (0 V). Common return for VCC and all I/O.
9 CIN input Channel C TTL/CMOS single-ended input. VIH >= 2 V, VIL <= 0.8 V. Drives the channel C differential output pair.
10 COUT output Channel C non-inverting differential (RS-422) output. 3-state; high impedance when the driver is disabled.
11 /COUT output Channel C inverting differential (RS-422) output (complement of COUT). 3-state; high impedance when the driver is disabled.
12 /EN input Active-low enable input. Together with EN (pin 4) enables all four channel outputs. When EN = L and /EN = H, all outputs are placed in high-impedance (Z) state.
13 /DOUT output Channel D inverting differential (RS-422) output (complement of DOUT). 3-state; high impedance when the driver is disabled.
14 DOUT output Channel D non-inverting differential (RS-422) output. 3-state; high impedance when the driver is disabled.
15 DIN input Channel D TTL/CMOS single-ended input. VIH >= 2 V, VIL <= 0.8 V. Drives the channel D differential output pair.
16 VCC power_in Positive supply voltage. Recommended 4.5 to 5.5 V (nominal 5 V); absolute max 7 V. Typical quiescent supply current 200 µA (max 500 µA) with static inputs.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOIC-16
Category Interface
Pins 16

Ordering variants

Same part, different packaging or reel option.

  • ST26C31BDR
  • ST26C31BN
  • ST26C31BTR

CAD (KiCad official)

  • Symbol: ST26C31BDR
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)
  • 3D model files: st26c31bdr-etched.step / st26c31bdr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); st26c31bdr.step / st26c31bdr.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
st26c31bdr.step 217 KB You want the bare part, or you mark your own boards.
st26c31bdr-etched.step 2.8 MB You want the part with ST26C31BDR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 674 faces against 267 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (15 pp, sha256 628b38556e56079d, 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