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SA555DR

Public Made by Adom

by adom

Texas Instruments Timers / Clock Oscillators, SOIC-8. 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 sa555dr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 5d ago
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 1mo ago
package.json Publish 0.2.0 · Ray 1mo ago
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 1mo ago
page.json Brief states the pinout check that actually ran (was an unconditional "Datasheet-verified pinout") · Ray 13d ago
README.md sa555dr: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 16d ago
sa555dr-etched.fit.json sa555dr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 5d ago
sa555dr-etched.glb sa555dr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 5d ago
sa555dr-etched.step sa555dr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 5d ago
sa555dr.glb Publish 0.1.0 · Ray 1mo ago
sa555dr.kicad_mod Publish 0.1.0 · Ray 1mo ago
sa555dr.kicad_sym Publish 0.1.0 · Ray 1mo ago
sa555dr.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect and oval pad as a SQUARE EAGLE smd; this carries the real pad shape across (0 -> 8 rounded pads) and stops dropping geometry drawn on KiCad User.N layers. Attributes, connects, pads and the pin-1 marker are gated against decreasing and are unchanged. · Ray 1mo ago
sa555dr.step Publish 0.1.0 · Ray 1mo ago

SA555DR

Texas Instruments · Timers / Clock Oscillators · SOIC-8

SA555DR 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 GND power_in Ground reference (0 V) for the device.
2 TRIG input Trigger input. The output pulse begins when a negative-going pulse on TRIG crosses below 1/3 VCC, setting the internal flip-flop and driving OUT high.
3 OUT output Timer output. Drives high (near VCC) during the timing interval and low (near GND) otherwise. Capable of sourcing/sinking up to ~200 mA.
4 RESET input Active-low reset. When held below ~0.7 V, the timing cycle is interrupted and OUT is forced low. Tie to VCC when unused.
5 CONT input Control voltage. Provides access to the internal 2/3 VCC threshold reference. Typically bypassed to GND with a 10 nF capacitor for noise immunity; can be driven to modulate the timing thresholds.
6 THRES input Threshold input. Resets the internal flip-flop (ending the output pulse) when the voltage on THRES rises above 2/3 VCC.
7 DISCH output Discharge. Open-collector output tied to the timing capacitor; provides a low-impedance path to GND to discharge the external timing capacitor between cycles.
8 VCC power_in Positive supply voltage. Operating range 4.5 V to 16 V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category RTC
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • SA555DR
  • SA555DRD
  • SA555DRP

CAD (KiCad official)

  • Symbol: SA555DR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: sa555dr-etched.step / sa555dr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sa555dr.step / sa555dr.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
sa555dr.step 122 KB You want the bare part, or you mark your own boards.
sa555dr-etched.step 1.8 MB You want the part with SA555DR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 439 faces against 147 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: Texas Instruments datasheet (39 pp, sha256 c6f5275b8c31eb1d, 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