component
ICM7555MM
Public Made by Adomby adom
HGSEMI Timers / Counters, MSOP-8. Pinout cross-checked by two models against the datasheet, 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
markdownICM7555MM
HGSEMI · Timers / Counters · MSOP-8
ICM7555MM 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; all voltages are measured relative to this pin and it is the source of the internal discharge transistor. |
| 2 | TRIGGER | input | Trigger input; a voltage below 1/3 VCC sets the flip-flop and drives OUTPUT high, with typical input current of 20pA. |
| 3 | OUTPUT | output | Timer output, TTL/CMOS compatible at 5V, with VOH of 4.0V min at 5V and -2mA and VOL of 0.4V max at 3.2mA. |
| 4 | RESET | input | Active-low reset of the flip-flop; LOW forces OUTPUT low and turns the discharge switch on, with the reset voltage threshold typically 0.7V at VCC=5V. |
| 5 | CONTROL VOLTAGE | input | Control voltage input that sets the comparator threshold, typically 3.33V at VCC=5V (2/3 VCC). |
| 6 | THRESHOLD | input | Threshold input; a voltage above 2/3 VCC resets the flip-flop, driving OUTPUT low and turning on the discharge switch, with typical input current of 20pA. |
| 7 | DISCHARGE | passive | Open-drain discharge transistor output for the timing capacitor, with saturation voltage of 400mV max at 10mA and VCC=5V. |
| 8 | VDD | power_in | Positive supply voltage, recommended 4.5V to 15V with absolute maximum of 15V. |
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 current | Is | 30 | 50 | uA | VCC=5V, TA=25℃ | 4 | |
| Supply current | Is | 60 | 100 | uA | VCC=10V, TA=25℃ | 4 | |
| Supply current | Is | 90 | 150 | uA | VCC=15V, TA=25℃ | 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 or VCC=15V, 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 |
| Reset voltage | VRES | 0.4 | 0.7 | 1.2 | V | 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 | |||
| Trigger current | ITRIG | 10 | pA | VCC=5V | 4 | ||
| Reset current | IRES | 10 | pA | VCC=5V | 4 | ||
| Threshold current | ITHRESH | 10 | pA | VCC=5V | 4 | ||
| Supply voltage | 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 10s) | TLEAD | 260 | ℃ | 10s soldering | 3 | ||
| Supply voltage | Vcc | 4.5 | 15 | V | TA=25℃ | 3 | |
| Maximum input voltage (Vth, Vtrig, VCTRL, Vreset) | Vth, Vtrig, VCTRL, Vreset | -0.3 | V | upper limit printed as Vcc+0.3 V | 3 |
CAD (KiCad official)
- Symbol:
ICM7555MM - Footprint:
Package_SO:MSOP-8_3x3mm_P0.65mm - 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files:
icm7555mm-etched.step/icm7555mm-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);icm7555mm.step/icm7555mm.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HGSEMI datasheet (11 pp, sha256
e95f11bad730cc7b, retrieved 2026-10-20, 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-sonnet-5-5(text+vision), consensusclaude-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).