component

NE555DR

Public Unreviewed

by Ray

Texas Instruments Timers / Counters, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentclock-timingne555dr
Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

Symbol & Footprint

Schematic Symbol

Open full view ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

PCB Footprint

Open full view ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

Datasheet

Open in new tab ↗
Loads on click. Unloads when scrolled away or the tab is hidden.
Download PDF
Contents

README

markdown

NE555DR

Texas Instruments · Timers / Counters · SOIC-8

NE555DR 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 for the device. All voltage measurements are referenced to this pin.
2 TRIG input Trigger input. Start of timing input: when TRIG falls below 1/2 CONT (nominally 1/3 VCC), the internal flip-flop is set, the output goes high, and the discharge switch opens.
3 OUT output High-current timer output signal. Capable of sinking or sourcing up to 200 mA. TTL-compatible with a 5 V supply.
4 RESET input Active-low reset input. Forces the output and discharge low regardless of the state of TRIG or THRES. Reset threshold nominally 0.7 V. Tie to VCC if unused.
5 CONT bidirectional Control voltage input/output. Nominally 2/3 x VCC; sets the comparator thresholds and allows external modulation of the timing. Typically bypassed to GND with a 10 nF capacitor when unused.
6 THRES input Threshold input. End of timing input: when THRES exceeds CONT (nominally 2/3 VCC), the internal flip-flop is reset, driving OUT low and closing the discharge switch.
7 DISCH output Discharge. Open-collector output to discharge the external timing capacitor when the internal flip-flop is reset.
8 VCC power_in Positive supply voltage. Operating range 4.5 V to 16 V (18 V max for SE555).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Clock/Timing
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • NE555DR
  • NE555DRD
  • NE555DRP
  • NE555DRPS
  • NE555DRPW
  • NE555DRFK
  • NE555DRJG

CAD (KiCad official)

  • Symbol: NE555DR
  • 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 (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