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NE556M

Public Made by Adom

by adom

HGSEMI Timers / Clock Oscillators, SOP-14. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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NE556M

HGSEMI · Timers / Clock Oscillators · SOP-14

NE556M from HGSEMI, in a SOP-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 DIS1 output Discharge pin for timer 1. Open-collector output that discharges the external timing capacitor when the internal flip-flop is in the reset state.
2 THR1 input Threshold input for timer 1. When the voltage on this pin exceeds 2/3 VCC, the internal flip-flop is reset, ending the timing interval.
3 OUT1 output Output of timer 1. Push-pull output capable of sourcing or sinking up to 200 mA; swings between near-ground and near-VCC.
4 RST1 input Reset input for timer 1 (active low). Pulling this pin below ~0.7V forces the output low and discharges the timing capacitor regardless of other inputs. Tie to VCC when unused.
5 CON1 input Control voltage input for timer 1. Allows direct access to the 2/3 VCC internal reference divider to modify timing thresholds or perform pulse-width modulation. Bypass to GND with 0.01 uF if unused.
6 TRG1 input Trigger input for timer 1 (active low). A negative-going pulse below 1/3 VCC starts the timing interval and drives the output high.
7 GND power_in Device ground reference. Common return for both timers and all internal circuitry.
8 TRG2 input Trigger input for timer 2 (active low). A negative-going pulse below 1/3 VCC starts the timing interval and drives the output high.
9 CON2 input Control voltage input for timer 2. Allows direct access to the 2/3 VCC internal reference divider to modify timing thresholds or perform pulse-width modulation. Bypass to GND with 0.01 uF if unused.
10 RST2 input Reset input for timer 2 (active low). Pulling this pin below ~0.7V forces the output low and discharges the timing capacitor regardless of other inputs. Tie to VCC when unused.
11 OUT2 output Output of timer 2. Push-pull output capable of sourcing or sinking up to 200 mA; swings between near-ground and near-VCC.
12 THR2 input Threshold input for timer 2. When the voltage on this pin exceeds 2/3 VCC, the internal flip-flop is reset, ending the timing interval.
13 DIS2 output Discharge pin for timer 2. Open-collector output that discharges the external timing capacitor when the internal flip-flop is in the reset state.
14 VCC power_in Positive supply voltage, 4.5V to 16V. Powers both internal timer sections; bypass locally with a 0.1 uF ceramic to GND.

Key specifications

Parameter Value
Manufacturer HGSEMI
Package SOP-14
Category RTC
Pins 14

Ordering variants

Same part, different packaging or reel option.

  • NE556MM
  • NE556MN
  • NE556MP

CAD (KiCad official)

  • Symbol: NE556M
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOP-14 (KiCad packages3D, STEP)
  • 3D model files: ne556m-etched.step / ne556m-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ne556m.step / ne556m.glb are the bare package body.

Provenance

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

  • Datasheet: HGSEMI datasheet (9 pp, sha256 fdee0501f2001d17, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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