component
se555dr
Public Unreviewedby Ray
Texas Instruments Timers / Clock Oscillators, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
README
markdownSE555DR
Texas Instruments · Timers / Clock Oscillators · SOIC-8
SE555DR from Texas Instruments, in a SOIC-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 reference (0 V). Return for all supply and signal currents. |
| 2 | TRIG | input | Trigger input. A negative-going pulse below VCC/3 (1/3 VCC) sets the internal flip-flop and drives the output HIGH. Typical trigger threshold ~1.67 V at VCC=5 V, ~5 V at VCC=15 V. |
| 3 | OUT | output | Push-pull output. Can source or sink up to 200 mA. Output HIGH is approximately VCC - 1.7 V (typ) at 100 mA sink; output LOW is ~0.1 V at 5 mA sink. |
| 4 | RESET | input | Active-low reset input. Forces the output LOW and discharge transistor ON regardless of other inputs when pulled below ~0.7 V. Tie to VCC if unused. Reset current typ 0.1 mA. |
| 5 | CONT | input | Control voltage input. Directly accesses the 2/3 VCC reference of the upper comparator, allowing external modulation of timing thresholds. Bypass to GND with 0.01 µF when unused. Nominal voltage 2/3 VCC (~3.33 V at 5 V, ~10 V at 15 V). |
| 6 | THRES | input | Threshold input. When the voltage on THRES rises above 2/3 VCC, the internal flip-flop resets, driving the output LOW and turning on the discharge transistor. Typical threshold ~3.33 V at VCC=5 V, ~10 V at VCC=15 V. |
| 7 | DISCH | output | Discharge output (open-collector NPN to GND). Provides a discharge path for the external timing capacitor when the output is LOW. Sinks the timing-capacitor current to GND; not driven high internally. |
| 8 | VCC | power_in | Positive supply voltage. Operating range 4.5 V to 18 V (SE555). Supply current typ 3 mA at VCC=5 V, 10 mA at VCC=15 V (output LOW). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | RTC |
| Pins | 8 |
Ordering variants
SE555DRSE555DRD
CAD (KiCad official)
- Symbol:
SE555DR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (None pp, sha256
c6f5275b8c31eb1d, retrieved 2026-08-17, tier: manufacturer) - 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).