component
WD1033E-5
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WILLSEMI Will Semicon DC-DC Converters, SOT-23-5L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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WD1033E-5
WILLSEMI Will Semicon · DC-DC Converters · SOT-23-5L
WD1033E-5 from WILLSEMI Will Semicon, in a SOT-23-5L. 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 | EN | input | Enable control: pull high to turn on the device and drive to GND for shutdown; do not leave it floating. EN rising threshold is 1.4 V and falling threshold is 0.4 V. |
| 2 | GND | power_in | Ground pin. |
| 3 | SW | output | Inductor (switch node) pin; DC voltage range is -0.3 V to VIN per the absolute maximum ratings. |
| 4 | VIN | power_in | Input pin, operating range 2.5 V to 5.5 V; decouple to GND with at least 10 uF ceramic capacitor placed close to the pin. |
| 5 | FB | input | Feedback pin: connected to the feedback resistor divider for the adjustable version or to VOUT for the fixed-output version; feedback reference voltage is 0.6 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | WILLSEMI Will Semicon |
| Package | SOT-23-5L |
| Category | Power Management (PMIC) |
| Pins | 5 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Voltage Range | VIN | 2.5 | 5.5 | V | 4 | ||
| VIN Under Voltage Lockout Threshold, rising | VUVLO | 2.4 | 2.5 | V | Rising | 4 | |
| Shutdown Supply Current | ISHDN | 0.2 | 1 | uA | VEN = 0V | 4 | |
| Feedback reference Voltage | VFB | 0.588 | 0.6 | 0.612 | V | Vin=Vout(nom)+1 V, 0mA<=IOUT<=250MA | 4 |
| Feedback Leakage Current | IFB | -30 | 30 | nA | 4 | ||
| VIN pin voltage range | VIN | -0.3 | 6.5 | V | 3 | ||
| EN, FB pin voltage range | -0.3 | V | Upper limit printed as VIN | 3 | |||
| SW pin voltage range (DC) | -0.3 | V | Upper limit printed as VIN | 3 | |||
| Power Dissipation, SOT-23-5L | PD | 0.5 | W | Note 1: surface mounted on FR-4, 1 square inch pad, dual side, 1oz copper | 3 | ||
| Junction temperature | TJ | 150 | oC | 3 | |||
| Lead temperature (soldering, 10s) | TL | 260 | oC | Soldering, 10s | 3 | ||
| Operating ambient temperature | Topr | -40 | 85 | oC | 3 | ||
| Storage temperature | Tstg | -55 | 150 | oC | 3 | ||
| Standby Supply Current | IQ | 40 | uA | VFB = 105%, IOUT = 0A | 4 | ||
| VIN Under Voltage Lockout Threshold, falling | VUVLO | 2.3 | V | Falling | 4 | ||
| Line Regulation | △LINE | 0.15 | %/V | VIN = 2.5V to 5.5V | 4 | ||
| Inductor Limit Current | ILIM | 3.5 | A | VIN = 3.6V, VOUT = 90%*VOUT | 4 | ||
| Oscillator Frequency | fOSC | 1.5 | MHz | VFB or VOUT in regulation | 4 | ||
| RDS(ON) of P-Channel FET | RPFET | 0.12 | Ω | ISW = 100mA | 4 | ||
| RDS(ON) of N-Channel FET | RNFET | 0.08 | Ω | ISW = −100mA | 4 | ||
| EN Rising Threshold | VENH | 1.4 | V | 4 | |||
| EN falling Threshold | VENL | 0.4 | V | 4 | |||
| EN Leakage Current | IEN | 1 | uA | VIN = 5.5V, VEN = 0V or VIN | 4 | ||
| Min On Time | 75 | nS | 4 | ||||
| Max Duty Cycle | 100 | % | 4 | ||||
| Soft Start Time | 700 | uS | 4 | ||||
| Input OVP Shutdown, rising | VOVP | 6.5 | V | Rising | 4 | ||
| Input OVP Shutdown, falling | VOVP | 6.3 | V | Falling | 4 | ||
| Over Voltage Protection Blanking Time | 20 | uS | 4 | ||||
| Over Temperature Protection | TOTP | 155 | oC | 4 | |||
| OTP Hysteresis | 30 | oC | 4 | ||||
| Junction to Ambient Thermal Resistance, SOT-23-5L | RθJA | 250 | oC/W | Note 1: surface mounted on FR-4, 1 square inch pad, dual side, 1oz copper | 3 |
CAD (KiCad official)
- Symbol:
WD1033E-5 - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5L (KiCad packages3D, STEP)
- 3D model files:
wd1033e-5-etched.step/wd1033e-5-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);wd1033e-5.step/wd1033e-5.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: WILLSEMI Will Semicon datasheet (12 pp, sha256
4d95ab4de3b36db1, retrieved 2026-10-19, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).
# WD1033E-5
**WILLSEMI Will Semicon** · DC-DC Converters · SOT-23-5L
WD1033E-5 from WILLSEMI Will Semicon, in a SOT-23-5L. 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 | EN | input | Enable control: pull high to turn on the device and drive to GND for shutdown; do not leave it floating. EN rising threshold is 1.4 V and falling threshold is 0.4 V. |
| 2 | GND | power_in | Ground pin. |
| 3 | SW | output | Inductor (switch node) pin; DC voltage range is -0.3 V to VIN per the absolute maximum ratings. |
| 4 | VIN | power_in | Input pin, operating range 2.5 V to 5.5 V; decouple to GND with at least 10 uF ceramic capacitor placed close to the pin. |
| 5 | FB | input | Feedback pin: connected to the feedback resistor divider for the adjustable version or to VOUT for the fixed-output version; feedback reference voltage is 0.6 V. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | WILLSEMI Will Semicon |
| Package | SOT-23-5L |
| Category | Power Management (PMIC) |
| Pins | 5 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Voltage Range | VIN | 2.5 | | 5.5 | V | | 4 |
| VIN Under Voltage Lockout Threshold, rising | VUVLO | 2.4 | | 2.5 | V | Rising | 4 |
| Shutdown Supply Current | ISHDN | | 0.2 | 1 | uA | VEN = 0V | 4 |
| Feedback reference Voltage | VFB | 0.588 | 0.6 | 0.612 | V | Vin=Vout(nom)+1 V, 0mA<=IOUT<=250MA | 4 |
| Feedback Leakage Current | IFB | -30 | | 30 | nA | | 4 |
| VIN pin voltage range | VIN | -0.3 | | 6.5 | V | | 3 |
| EN, FB pin voltage range | | -0.3 | | | V | Upper limit printed as VIN | 3 |
| SW pin voltage range (DC) | | -0.3 | | | V | Upper limit printed as VIN | 3 |
| Power Dissipation, SOT-23-5L | PD | | | 0.5 | W | Note 1: surface mounted on FR-4, 1 square inch pad, dual side, 1oz copper | 3 |
| Junction temperature | TJ | | | 150 | oC | | 3 |
| Lead temperature (soldering, 10s) | TL | | | 260 | oC | Soldering, 10s | 3 |
| Operating ambient temperature | Topr | -40 | | 85 | oC | | 3 |
| Storage temperature | Tstg | -55 | | 150 | oC | | 3 |
| Standby Supply Current | IQ | | 40 | | uA | VFB = 105%, IOUT = 0A | 4 |
| VIN Under Voltage Lockout Threshold, falling | VUVLO | | 2.3 | | V | Falling | 4 |
| Line Regulation | △LINE | | 0.15 | | %/V | VIN = 2.5V to 5.5V | 4 |
| Inductor Limit Current | ILIM | | 3.5 | | A | VIN = 3.6V, VOUT = 90%*VOUT | 4 |
| Oscillator Frequency | fOSC | | 1.5 | | MHz | VFB or VOUT in regulation | 4 |
| RDS(ON) of P-Channel FET | RPFET | | 0.12 | | Ω | ISW = 100mA | 4 |
| RDS(ON) of N-Channel FET | RNFET | | 0.08 | | Ω | ISW = −100mA | 4 |
| EN Rising Threshold | VENH | | 1.4 | | V | | 4 |
| EN falling Threshold | VENL | | 0.4 | | V | | 4 |
| EN Leakage Current | IEN | | 1 | | uA | VIN = 5.5V, VEN = 0V or VIN | 4 |
| Min On Time | | | 75 | | nS | | 4 |
| Max Duty Cycle | | | 100 | | % | | 4 |
| Soft Start Time | | | 700 | | uS | | 4 |
| Input OVP Shutdown, rising | VOVP | | 6.5 | | V | Rising | 4 |
| Input OVP Shutdown, falling | VOVP | | 6.3 | | V | Falling | 4 |
| Over Voltage Protection Blanking Time | | | 20 | | uS | | 4 |
| Over Temperature Protection | TOTP | | 155 | | oC | | 4 |
| OTP Hysteresis | | | 30 | | oC | | 4 |
| Junction to Ambient Thermal Resistance, SOT-23-5L | RθJA | | 250 | | oC/W | Note 1: surface mounted on FR-4, 1 square inch pad, dual side, 1oz copper | 3 |
## CAD (KiCad official)
- Symbol: `WD1033E-5`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5L (KiCad packages3D, STEP)
- 3D model files: `wd1033e-5-etched.step` / `wd1033e-5-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `wd1033e-5.step` / `wd1033e-5.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [WILLSEMI Will Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588918029229445120) (12 pp, sha256 `4d95ab4de3b36db1`, retrieved 2026-10-19, tier: lcsc)
- **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/wd1033e-5-datasheet.pdf)