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)

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