# TLC555M

**HGSEMI** · Timers / Counters · SOP-8

TLC555M 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 | Ground; all voltages are measured relative to this pin. |
| 2 | TRIGGER | input | Trigger input that sets the output high when its voltage falls below 1/3 VCC, with typical input current of 20pA (10pA max at VCC=5V). |
| 3 | OUTPUT | output | Timer output, TTL and CMOS compatible at 5V, with VOL 0.4V max at 3.2mA and VOH 4.0V min at -2mA (VCC=5V). |
| 4 | RESET | input | Active-low reset that forces the output low and turns the discharge switch on; input range -0.3V to VCC+0.3V. |
| 5 | CONTROL VOLTAGE | input | Control voltage input that sets the comparator thresholds, typically 3.33V at VCC=5V; input range -0.3V to VCC+0.3V. |
| 6 | THRESHOLD | input | Threshold input that drives the output low and turns on the discharge switch when above 2/3 VCC; input range -0.3V to VCC+0.3V. |
| 7 | DISCHARGE | passive | Open-drain discharge transistor output for the timing capacitor, with 400mV max saturation voltage at 10mA (VCC=5V). |
| 8 | VDD | power_in | Positive supply, recommended 4.5V to 15V, absolute maximum 15V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | SOP-8 |
| Category | Clock/Timing |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage (absolute maximum) | Vcc |  |  | 15 | V |  | 3 |
| Operating temperature range | Toper | -40 |  | 85 | ℃ |  | 3 |
| Junction temperature | Tj |  |  | 150 | ℃ |  | 3 |
| Storage temperature range | Tstg | -50 |  | 150 | ℃ |  | 3 |
| Lead temperature (soldering) | TLEAD |  |  | 260 | ℃ | soldering 10s | 3 |
| Supply voltage (recommended) | Vcc | 4.5 |  | 15 | V | TA=25℃ | 3 |
| Maximum input voltage (Vth, Vtrig, VCTRL, Vreset) | Vth, Vtrig, VCTRL, Vreset | -0.3 |  |  | V |  | 3 |
| Supply current | Is |  | 30 | 50 | uA | VCC=5V | 4 |
| Supply current | Is |  | 60 | 100 | uA | VCC=10V | 4 |
| Supply current | Is |  | 90 | 150 | uA | VCC=15V | 4 |
| Control voltage | VCTRL | 3.28 | 3.33 | 3.38 | V | VCC=5V | 4 |
| Control voltage | VCTRL | 6.6 | 6.66 | 6.7 | V | VCC=10V | 4 |
| Control voltage | VCTRL | 9.95 | 10 | 10.15 | V | VCC=15V | 4 |
| Discharge saturation voltage | VDIS |  | 100 | 400 | mV | VCC=5V, IDIS=10mA | 4 |
| Output voltage low | VOL |  | 0.1 | 0.4 | V | VCC=5V, Io=3.2mA | 4 |
| Output voltage high | VOH | 4 | 4.5 |  | V | VCC=5V, Io=-2mA | 4 |
| Output voltage high | VOH | 14.5 | 14.75 |  | V | VCC=15V, Io=-2mA | 4 |
| Trigger voltage | VTRIG | 1.55 | 1.66 | 1.7 | V | VCC=5V | 4 |
| Trigger voltage | VTRIG | 3.23 | 3.33 | 3.38 | V | VCC=10V | 4 |
| Trigger voltage | VTRIG | 4.95 | 5 | 5.05 | V | VCC=15V | 4 |
| Trigger current | ITRIG |  |  | 10 | pA | VCC=5V | 4 |
| Reset voltage | VRES | 0.4 | 0.7 | 1.2 | V | VCC=5V | 4 |
| Reset current | IRES |  |  | 10 | pA | VCC=5V | 4 |
| Threshold current | ITHRESH |  |  | 10 | pA | VCC=5V | 4 |
| Discharge leakage current | IDIS |  | 1 | 100 | nA | VCC=12V | 4 |
| Output rise time | tR | 35 | 40 | 75 | ns | VCC=5V, RL=10MΩ, CL=10pF | 4 |
| Output fall time | tF | 35 | 40 | 75 | ns | VCC=5V, RL=10MΩ, CL=10pF | 4 |
| Maximum frequency | Fmax |  |  | 500 | KHz |  | 4 |

## CAD (KiCad official)

- Symbol: `TLC555M`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `tlc555m-etched.step` / `tlc555m-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tlc555m.step` / `tlc555m.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HGSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8758141585521688576) (11 pp, sha256 `777c468f30a3b658`, retrieved 2026-10-18, 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`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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).

[Datasheet PDF](docs/tlc555m-datasheet.pdf)