# SE9450D-435-HF

**Seaward Elec** · Battery Management · DFN-8-EP(2x2)

SE9450D-435-HF from Seaward Elec, in a DFN-8-EP(2x2). 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 | TEMP | input | Battery temperature sense input for the battery NTC network; charging pauses when TEMP<45%Vcc or TEMP>80%Vcc, and tying TEMP to ground disables this function. |
| 2 | PROG | passive | Constant-charge-current setting and charge-current monitor pin, programmed by a resistor to GND (RPROG = 1000/IBAT in the datasheet's units). |
| 3 | GND | power_in | Power ground. |
| 4 | VCC | power_in | Positive input supply, 4.5 to 25V recommended (28V absolute max) with 6.5V input overvoltage protection. |
| 5 | BAT | power_out | Battery connection pin; float voltage is 4.35V (typ) for the -435 option. |
| 6 | STDBY | output | Open-drain charge-complete indicator, pulled low when charging is complete and high impedance otherwise. |
| 7 | CHRG | output | Open-drain charge indicator, pulled low while charging and high impedance otherwise. |
| 8 | CE | input | Chip enable input; high enables normal operation and low stops the chip. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Seaward Elec |
| Package | DFN-8-EP(2x2) |
| Category | Power Management (PMIC) |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `SE9450D-435-HF`
- Footprint: `Package_DFN_QFN:DFN-8-1EP_2x2mm_P0.5mm_EP0.6x1.2mm`
- 3D model: DFN-8-EP(2x2) (KiCad packages3D, STEP)
- 3D model files: `se9450d-435-hf-etched.step` / `se9450d-435-hf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `se9450d-435-hf.step` / `se9450d-435-hf.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Seaward Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8761317303793668096) (14 pp, sha256 `8a53ce8ea33ee242`, retrieved 2026-10-09, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/se9450d-435-hf-datasheet.pdf)