# NE555MM

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

NE555MM from HGSEMI, in a MSOP-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. |
| 2 | RTIG | input | Trigger input; trigger voltage is 1.67 V typ at VCC=5V and 5 V typ at VCC=15V. |
| 3 | OUT | output | Output; high-level voltage 2.75 V min at VCC=5V, IS=100mA, and low-level voltage 0.25 V typ at VCC=5V, ISINK=5mA is not stated as max. |
| 4 | R | input | Reset input; reset voltage 0.4 V min, 0.5 V typ, 1 V max. |
| 5 | CONTRIG | passive | Control voltage (trigger control) pin; control voltage is 10 V typ at VCC=15V and 3.33 V typ at VCC=5V. |
| 6 | CONTH | input | Threshold input (threshold control); threshold voltage is 0.667*VCC. |
| 7 | DIS | passive | Discharge pin; leakage current 20 nA typ (100 nA max) when output high, saturation voltage 180 mV at VCC=15V, I7=15mA. |
| 8 | VCC | power_in | Supply voltage pin; operating range 4.5 V to 16 V, absolute maximum 18 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | MSOP-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 | VCC |  |  | 18 | V |  | 3 |
| Operating ambient temperature (NE555 grade) | Tamb | 0 |  | 70 | ℃ | NE555 grade | 3 |
| Storage temperature | Tstg | -65 |  | 150 | ℃ |  | 3 |
| Lead temperature (soldering) | TLEAD |  |  | 260 | ℃ | soldering 10s | 3 |
| Supply voltage | VCC | 4.5 |  | 16 | V |  | 4 |
| Quiescent current | IQ |  | 3 | 6 | mA | VCC=5V, RL=∞ | 4 |
| Quiescent current | IQ |  | 10 | 15 | mA | VCC=15V, RL=∞ | 4 |
| Threshold current | ITH |  | 0.1 | 0.25 | uA |  | 4 |
| Trigger current | ITR |  | 0.5 | 2 | uA |  | 4 |
| Reset voltage | VR | 0.4 | 0.5 | 1 | V |  | 4 |
| Reset current | IR |  | 0.1 | 0.4 | mA |  | 4 |
| Control voltage | VCON | 9 | 10 | 11 | V | VCC=15V | 4 |
| Control voltage | VCON | 2.6 | 3.33 | 4 | V | VCC=5V | 4 |
| Pin 7 leakage current (output high) | I7(IEAK) |  | 20 | 100 | nA | output high | 4 |
| Pin 7 saturation voltage (output low) | V7(SAT) |  | 80 | 200 | mV | Vcc=4.5V, I7=4.5mA | 4 |
| Output high voltage | VOH |  | 12.75 | 13.3 | V | VCC=15V, IS=100mA | 4 |
| Output high voltage | VOH |  | 2.75 | 3.3 | V | VCC=5V, IS=100mA | 4 |
| Output low voltage | VOL |  | 0.1 | 0.25 | V | VCC=15V, ISINK=10mA | 4 |
| Output low voltage | VOL |  | 0.4 | 0.75 | V | VCC=15V, ISINK=50mA | 4 |
| Output low voltage | VOL |  | 2 | 2.5 | V | VCC=15V, ISINK=100mA | 4 |
| Output low voltage | VOL |  | 0.25 | 0.35 | V | VCC=5V, ISINK=5mA | 4 |
| Threshold voltage | VTH |  | 0.667 |  | *Vcc |  | 4 |
| Trigger voltage | VTR |  | 5 |  | V | VCC=15V | 4 |
| Trigger voltage | VTR |  | 1.67 |  | V | VCC=5V | 4 |
| Pin 7 saturation voltage (output low) | V7(SAT) |  | 180 |  | mV | Vcc=15V, I7=15mA | 4 |
| Output high voltage | VOH |  | 12.5 |  | V | VCC=15V, IS=200mA | 4 |
| Output low voltage | VOL |  | 2.5 |  | V | VCC=15V, ISINK=200mA | 4 |
| Output rise time | tr |  | 100 |  | nS |  | 4 |
| Output fall time | tf |  | 100 |  | nS |  | 4 |
| Initial timing accuracy (monostable) | ΔtE |  | 1 |  | % | monostable; RA,RB=1~100k; C=0.1 uF; VCC=5V(15V) | 4 |
| Timing drift vs temperature (monostable) | ΔtT |  | 50 |  | ppm/℃ |  | 4 |
| Timing drift vs voltage (monostable) | ΔtV |  | 0.1 |  | %/V |  | 4 |
| Timing accuracy over operating temperature range (monostable) | ΔtOPr |  | 1.5 |  | % |  | 4 |
| Initial timing accuracy (astable) | ΔtE1 |  | 2.25 |  | % | astable; RA,RB=1~100k; C=0.1 uF; Vcc=5V(15V) | 4 |
| Timing drift vs temperature (astable) | ΔtT1 |  | 150 |  | ppm/℃ |  | 4 |
| Timing drift vs voltage (astable) | ΔtV1 |  | 0.3 |  | %/V |  | 4 |
| Timing accuracy over operating temperature range (astable) | ΔtOpr1 |  | 3 |  | % |  | 4 |

## CAD (KiCad official)

- Symbol: `NE555MM`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `ne555mm-etched.step` / `ne555mm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ne555mm.step` / `ne555mm.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/8757993754831794176) (12 pp, sha256 `aeacc0a1e25195ab`, 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-haiku-5-5` (text), consensus `claude-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).

[Datasheet PDF](docs/ne555mm-datasheet.pdf)