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sa555m
Public Unreviewedby Ray
HGSEMI Timers / Clock Oscillators, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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HGSEMI · Timers / Clock Oscillators · SOP-8
SA555M from HGSEMI, in a SOP-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 / 0 V reference for the device. All internal timing, comparator, and output-stage return currents flow through this pin. |
| 2 | RTIG | input | Trigger input. A negative-going pulse below 1/3 VCC (typ. 1.67 V at VCC=5 V, 5 V at VCC=15 V) sets the internal flip-flop, driving OUT high and starting the timing cycle. Input current ~0.5 uA typ. |
| 3 | OUT | output | Push-pull output stage. Sources up to ~200 mA (VOH ≈ 12.5 V at VCC=15 V, IS=200 mA) or sinks up to ~200 mA (VOL ≈ 2.5 V at VCC=15 V, ISINK=200 mA). Rise/fall times ~100 ns. |
| 4 | R | input | Active-low reset input. Pulling below ~0.4-1 V (typ. 0.5 V) forces the internal flip-flop reset, discharging the timing capacitor and driving OUT low regardless of TRIG/THRES state. Reset current ~0.1 mA typ. Tie to VCC when unused. |
| 5 | CONTRIG | input | Control voltage (CV) input to the internal 2/3 VCC threshold reference. Nominally 2/3 VCC (typ. 3.33 V at VCC=5 V, 10 V at VCC=15 V). Bypass to GND with a 0.01 uF capacitor when unused; can be driven to modulate output pulse width (PWM/PPM). |
| 6 | CONTH | input | Threshold input. When the voltage on this pin rises above 2/3 VCC (typ. 0.667*VCC), the internal comparator resets the flip-flop, driving OUT low and turning on the discharge transistor. Input current ~0.1 uA typ. |
| 7 | DIS | output | Discharge open-collector output from an internal NPN transistor whose collector is tied here and emitter to GND. Provides the discharge path for the external timing capacitor when OUT is low. V7(SAT) ~180 mV at 15 mA sink; leakage ~20 nA typ. |
| 8 | VCC | power_in | Positive supply pin. Operating range 4.5 V to 16 V (absolute max 18 V). Typical quiescent current 3 mA at VCC=5 V, 10 mA at VCC=15 V (RL=∞). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | SOP-8 |
| Category | RTC |
| Pins | 8 |
Ordering variants
SA555MM/TRSA555MM-4K/TRSA555MNSA555MMM/TRSA555MDQ2/TRSA555MDQ3/TR
CAD (KiCad official)
- Symbol:
SA555M - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HGSEMI datasheet (None pp, sha256
aeacc0a1e25195ab, 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).