component
LMC555MM
Public Unreviewedby Ray
HGSEMI Timers / Counters, MSOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLMC555MM
HGSEMI · Timers / Counters · MSOP-8
LMC555MM from HGSEMI, in a MSOP-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 (0 V). Common return for supply and signals. |
| 2 | TRIG | input | Trigger input. A falling edge below 1/3 VCC starts the timing cycle and sets the output high. |
| 3 | OUT | output | Push-pull timer output. Sources or sinks output current (typ. up to ~100 mA capability, application dependent) between GND and VCC. |
| 4 | RESET | input | Active-low reset. Pulling below ~0.7 V forces the output low and discharges the timing capacitor. Tie to VCC when unused. |
| 5 | CONT | input | Control voltage input. Provides direct access to the internal 2/3 VCC threshold reference; typically bypassed to GND with a 10 nF capacitor when unused. |
| 6 | THRES | input | Threshold input. When the voltage on this pin exceeds 2/3 VCC, the internal comparator resets the flip-flop and the output goes low. |
| 7 | DISCH | output | Discharge. Open-drain output tied to the internal flip-flop; used to discharge the external timing capacitor when the output is low. |
| 8 | VCC | power_in | Positive supply voltage. Operating range 1.5 V to 15 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | MSOP-8 |
| Category | Clock/Timing |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
LMC555MM - Footprint:
Package_SO:MSOP-8_3x3mm_P0.65mm - 3D model: MSOP-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HGSEMI datasheet (11 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).