component
LM555CM
Public Made by Adomby adom
HGSEMI Timers / Counters, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
README
markdownLM555CM
HGSEMI · Timers / Counters · SOP-8
LM555CM from HGSEMI, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Power ground reference pin for the device (电源地); the datasheet gives no further electrical limit for this pin. |
| 2 | Trig | input | Trigger input that starts the timing cycle when its voltage falls below 1/3 Vcc, with trigger input current at most 2 µA at VCC=15 V and VTRIG=0 V. |
| 3 | Output | output | Timer output that goes high on trigger and low on threshold; the datasheet gives VOH typically 13.3 V at VCC=15 V and IL=-100 mA, and an absolute output current rating of ±220 mA (recommended ±200 mA). |
| 4 | Reset | input | Reset input where a level at or below 0.5 V (at VCC=5 V) forces the output low and the timer is enabled at or above 1.5 V (at VCC=5 V); reset current is at most 1.5 mA at VRESET=0 V and VCC=15 V. |
| 5 | Cont | input | Control voltage pin that sets the internal comparator reference, with VCL typically 10.0 V at VCC=15 V and 3.3 V at VCC=5 V, and which is used as the input for pulse-width or pulse-position modulation. |
| 6 | Thres | input | Threshold input that resets the output low when its voltage exceeds 2/3 Vcc, with threshold input current at most 250 nA at VCC=15 V and VTH=0 V. |
| 7 | Disch | passive | Discharge pin connected to the internal discharge transistor, with saturation voltage typically 140 mV and at most 480 mV at VCC=15 V and Idis=15 mA. |
| 8 | VCC | power_in | Positive supply pin with a recommended operating range of 4.5 V to 15 V and an absolute maximum of 18 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | SOP-8 |
| Category | Clock/Timing |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
LM555CM - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
lm555cm-etched.step/lm555cm-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm555cm.step/lm555cm.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HGSEMI datasheet (11 pp, sha256
625d5aa31573226e, retrieved 2026-10-09, 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: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).