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NE556DR

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by Ray

Texas Instruments Timers / Counters, SOIC-14. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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NE556DR

Texas Instruments · Timers / Counters · SOIC-14

NE556DR from Texas Instruments, in a SOIC-14. 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 1DIS output Timer 1 discharge. Open-collector output that discharges the external timing capacitor when the internal flip-flop is set.
2 1THRES input Timer 1 threshold input. When voltage rises above 2/3 VCC, the internal flip-flop resets and the output goes low.
3 1CONT input Timer 1 control voltage. Access to the internal 2/3 VCC reference; can be used to modulate output pulse width. Typically bypassed to GND with 10 nF.
4 1RESET input Timer 1 reset. Active-low; forces output low and discharge on when driven below ~0.7 V. Tie to VCC if unused.
5 1OUT output Timer 1 output. Push-pull output capable of sourcing/sinking up to 200 mA; swings between near-GND and near-VCC.
6 1TRIG input Timer 1 trigger. When driven below 1/3 VCC, sets the internal flip-flop and drives the output high.
7 GND power_in Device ground reference (0 V). Common return for both timers.
8 2TRIG input Timer 2 trigger. When driven below 1/3 VCC, sets the internal flip-flop and drives the output high.
9 2OUT output Timer 2 output. Push-pull output capable of sourcing/sinking up to 200 mA; swings between near-GND and near-VCC.
10 2RESET input Timer 2 reset. Active-low; forces output low and discharge on when driven below ~0.7 V. Tie to VCC if unused.
11 2CONT input Timer 2 control voltage. Access to the internal 2/3 VCC reference; can be used to modulate output pulse width. Typically bypassed to GND with 10 nF.
12 2THRES input Timer 2 threshold input. When voltage rises above 2/3 VCC, the internal flip-flop resets and the output goes low.
13 2DIS output Timer 2 discharge. Open-collector output that discharges the external timing capacitor when the internal flip-flop is set.
14 VCC power_in Positive supply voltage, 4.5 V to 16 V (NE556). Bypass to GND with 100 nF near the pin.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-14
Category Clock/Timing
Pins 14

Ordering variants

Same part, different packaging or reel option.

  • NE556DR
  • NE556DRD
  • NE556DRN
  • NE556DRP

CAD (KiCad official)

  • Symbol: NE556DR
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOIC-14 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Texas Instruments datasheet (31 pp, sha256 63e3e49f1c2acba3, 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