component
lmc555m
Public Unreviewedby Ray
HGSEMI Timers / Clock Oscillators, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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markdownLMC555M
HGSEMI · Timers / Clock Oscillators · SOP-8
LMC555M from HGSEMI, in a SOP-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 (0V). Connect to the negative supply rail. |
| 2 | TRIGGER | input | Trigger input. When the voltage at this pin falls below 1/3 VCC, the internal flip-flop is set and the OUTPUT goes HIGH. High input impedance CMOS input. |
| 3 | OUTPUT | output | Push-pull CMOS output. Can source and sink current to drive TTL/CMOS loads. Output swings between GND and VCC. |
| 4 | RESET | input | Active-low reset input. When held below approximately 0.7V, forces the OUTPUT LOW and DISCHARGE ON regardless of other inputs. Tie to VCC when not used. |
| 5 | CONTROL | input | Control voltage input. Provides direct access to the internal 2/3 VCC threshold reference divider. Typically bypassed to GND with a 0.01µF capacitor when not used. |
| 6 | THRESHOLD | input | Threshold input. When the voltage at this pin rises above 2/3 VCC (or the CONTROL voltage), the internal flip-flop is reset and the OUTPUT goes LOW. High input impedance CMOS input. |
| 7 | DISCHARGE | output | Open-drain discharge output. Connected to GND internally through an N-channel MOSFET when the internal flip-flop is reset (OUTPUT LOW). Typically used to discharge the timing capacitor in astable/monostable configurations. |
| 8 | VCC | power_in | Positive supply voltage input. Operating range 1.5V to 15V. Bypass with a 0.1µF ceramic capacitor to GND near the pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | SOP-8 |
| Category | RTC |
| Pins | 8 |
Ordering variants
LMC555MM
CAD (KiCad official)
- Symbol:
LMC555M - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HGSEMI datasheet (None pp, sha256
1b5a397f58210605, 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).