SE9027-HF
Public Made by Adomby adom
Seaward Elec Battery Management, SOT-23-6. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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README
markdownSE9027-HF
Seaward Elec · Battery Management · SOT-23-6
SE9027-HF from Seaward Elec, in a SOT-23-6. 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 | CHRG | output | Open-drain charge-status output. Pulled low by an internal N-channel MOSFET (ICHRG ≈ 5mA, VOL ≤ 0.4V) while the battery is being charged; high-impedance once the charge cycle completes. Typically drives a status LED to VCC through a series resistor. |
| 2 | GND | power_in | Device ground reference. Also the primary thermal path for the SOT-23-6 package; connect to a large copper pour to maximize allowable charge current. |
| 3 | BAT | power_out | Charge-current output to the single-cell Li-Ion/Li-Polymer battery. Regulates the final float voltage to 4.2V (SE9027-42) or 4.35V (SE9027-435) with ±1% accuracy; absolute maximum 11V, up to 800mA pin current. |
| 4 | VCC | power_in | Positive input supply. Operating range 4.5V-25V, absolute maximum 28V, with internal 6.5V OVP that blocks charging until VCC drops back below the threshold. Bypass to GND with at least 1µF (consider a small series resistor with low-ESR ceramics to damp start-up transients). |
| 5 | STDBY | output | Open-drain charge-termination status output. High-impedance while charging (pulled high by an external pull-up); pulled low by an internal N-channel MOSFET after the charge cycle completes. Typically drives a 'done' LED. |
| 6 | PROG | bidirectional | Charge-current program / monitor / shutdown pin. Connect a resistor RPROG from PROG to GND to set charge current (ICHG = 1000V / RPROG; e.g. 2kΩ → 500mA, 10kΩ → 100mA). VPROG ≈ 1.0V in current mode and can be sensed to monitor charge current. Pulling PROG above ~1.24V (or floating it) puts the charger into shutdown. Absolute maximum 7V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Seaward Elec |
| Package | SOT-23-6 |
| Category | PMIC |
| Pins | 6 |
Ordering variants
Same part, different packaging or reel option.
SE9027-42-HFSE9027-435-HF
CAD (KiCad official)
- Symbol:
SE9027-HF - Footprint:
Package_TO_SOT_SMD:SOT-23-6 - 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files:
se9027-hf-etched.step/se9027-hf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);se9027-hf.step/se9027-hf.glbare the bare package body.
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
se9027-hf.step |
97 KB | You want the bare part, or you mark your own boards. |
se9027-hf-etched.step |
1.7 MB | You want the part with SE9027-HF already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 414 faces against 117 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Seaward Elec datasheet (10 pp, sha256
209469ab3d3d70ed, 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).