component
WS4603E-5
Public Unreviewedby Ray
WILLSEMI Will Semicon AC-DC Controllers and Regulators, TSOT-25. Datasheet-verified pinout, 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
markdownWS4603E-5
WILLSEMI Will Semicon · AC-DC Controllers and Regulators · TSOT-25
WS4603E-5 from WILLSEMI Will Semicon, in a TSOT-25. 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 | OUT | power_out | Switched power output pin. Delivers input voltage (2.5 V to 5.5 V) to the load through the internal P-MOSFET (RON ~80 mΩ at VIN=5 V). Auto-discharges through a ~65 Ω FET when EN is low. Recommend 1 µF ceramic (plus 150 µF bulk for hot-plug) from OUT to GND. |
| 2 | GND | power_in | Device ground reference. Must be tied to the ground plane of the load; also serves as the return for the ISET resistor and the input/output bypass capacitors. |
| 3 | ISET | input | Current-limit setting pin. A resistor RSET from ISET to GND programs the over-current trip threshold per IOC(A) = 6.8 kΩ / RSET (e.g. 6.8 kΩ → ~1 A, 3.4 kΩ → ~2 A, 17 kΩ → ~0.4 A). Adjustable range 0.4 A to 2 A typical, ±20% accuracy. |
| 4 | EN | input | Active-high enable input. Drive high (VIH ≥ 1.6 V at VIN=5 V) to turn the switch on; drive low (VIL ≤ 0.4 V) to enter shutdown (ISD < 1 µA) and auto-discharge OUT. Absolute max -0.3 V to 6.5 V. Do not leave floating. |
| 5 | IN | power_in | Power input pin. Supply range 2.5 V to 5.5 V (absolute max -0.3 V to 6.5 V). UVLO releases at ~2.2 V typical with 200 mV hysteresis. Bypass with a 1 µF ceramic capacitor placed close to the pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | WILLSEMI Will Semicon |
| Package | TSOT-25 |
| Category | PMIC |
| Pins | 5 |
Ordering variants
Same part, different packaging or reel option.
WS4603E-5/TR
CAD (KiCad official)
- Symbol:
WS4603E-5 - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: TSOT-25 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: WILLSEMI Will Semicon datasheet (10 pp, sha256
a2879e120ed7450f, retrieved 2026-08-17, tier: lcsc) - 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).