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SE9450D-42-HF
Public Made by Adomby adom
Seaward Elec Battery Management, WDFN-8-EP(2x2). Pinout cross-checked by two models against the datasheet, 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
markdownSE9450D-42-HF
Seaward Elec · Battery Management · WDFN-8-EP(2x2)
SE9450D-42-HF from Seaward Elec, in a WDFN-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 an NTC; charging pauses when TEMP is below 45% Vcc or above 80% Vcc, and tying TEMP to ground disables the function. |
| 2 | PROG | passive | Constant-charge-current set and charge-current monitor pin; a resistor to GND sets the current (RPROG = 1000/IBAT, 1V at 2K in current mode). |
| 3 | GND | power_in | Power ground. |
| 4 | VCC | power_in | Positive input supply, 4.5V to 25V recommended (28V max), with 6.5V input overvoltage protection and UVLO at 3.7V. |
| 5 | BAT | bidirectional | Battery connection pin that sources charge current and is regulated to 4.2V float voltage (max -0.3V to 11V). |
| 6 | STDBY | output | Open-drain charge-complete indicator pulled low when charging is complete and high-impedance otherwise (max 28V, 0.4V low at 5mA). |
| 7 | CHRG | output | Open-drain charging indicator pulled low while charging and high-impedance otherwise (max 28V, 0.4V low at 5mA). |
| 8 | CE | input | Chip enable input; high enables normal operation and low stops the chip (max 6.0V). |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Seaward Elec |
| Package | WDFN-8-EP(2x2) |
| Category | Power Management (PMIC) |
| Pins | 9 |
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 supply voltage (VCC) | VCC | 4.5 | 5 | 25 | V | 5 | |
| Input voltage (Vin) absolute maximum | Vin | -0.3 | 28 | V | 4 | ||
| BAT voltage (Vbat) absolute maximum | Vbat | -0.3 | 11 | V | 4 | ||
| TEMP/CE/PROG voltage absolute maximum | -0.3 | 6 | V | 4 | |||
| CHRG / STDBY voltage absolute maximum | -0.3 | 28 | V | 4 | |||
| BAT pin current absolute maximum | IBAT | 1500 | mA | 4 | |||
| PROG pin current absolute maximum | IPROG | 2 | mA | 4 | |||
| TEMP/CE pin current absolute maximum | ITEMP/ICE | 5 | mA | 4 | |||
| Maximum junction temperature | 150 | °C | 4 | ||||
| Storage temperature range | -40 | 150 | °C | 4 | |||
| Lead temperature (soldering, 10 s) | 260 | °C | Soldering time 10 s | 4 | |||
| Recommended input voltage | 4.5 | 25 | V | 4 | |||
| Recommended operating ambient temperature | -20 | 85 | °C | 4 | |||
| Input supply current, charge mode | ICC | 1000 | μA | 充电模式，RPROG=2K | 5 | ||
| Input supply current, standby (charge terminated) | ICC | 170 | μA | 待机模式（充电终止） | 5 | ||
| Input supply current, shutdown | ICC | 3 | μA | 关机模式 | 5 | ||
| Float (regulated output) voltage, 4.2 V version | VFLOAT | 4.158 | 4.2 | 4.242 | V | IBAT = 30mA, RPROG=10K | 5 |
| BAT pin current, charge mode RPROG=2K | IBAT | 500 | mA | 充电模式（RPROG=2K） | 5 | ||
| BAT pin current, charge mode RPROG=1K | IBAT | 1000 | mA | 充电模式（RPROG=1K） | 5 | ||
| BAT pin current, standby | IBAT | 2 | uA | 待机模式，VBAT=4.3V | 5 | ||
| BAT pin current, shutdown | IBAT | 2 | uA | 关机模式 | 5 | ||
| Trickle charge current | ITRIKL | 50 | mA | VBAT<VTRIKL，RPROG=2K | 5 | ||
| Trickle charge threshold voltage | VTRIKL | 2.9 | V | RPROG=2K，VBAT 上升 | 5 | ||
| Trickle charge hysteresis voltage | VTRHYS | 100 | mV | RPROG=2K | 5 | ||
| VCC undervoltage lockout threshold | VUV | 3.7 | V | 从 VCC 低至高 | 5 | ||
| VCC undervoltage lockout hysteresis | VUVHYS | 150 | mV | 5 | |||
| VCC-VBAT lockout threshold (VCC rising) | VASD | 150 | mV | Vcc 上升 | 5 | ||
| VCC-VBAT lockout threshold (VCC falling) | VASD | 100 | mV | Vcc 下降 | 5 | ||
| C/10 termination current threshold, RPROG=2K | ITERM | 60 | mA | RPROG=2K | 5 | ||
| C/10 termination current threshold, RPROG=1K | ITERM | 100 | mA | RPROG=1K | 5 | ||
| PROG pin voltage | VPROG | 1 | V | RPROG=2K，电流模式 | 5 | ||
| CHRG pin output low voltage | VCHRG | 0.4 | V | ICHRG = 5mA | 5 | ||
| STDBY pin output low voltage | VSTDBY | 0.4 | V | ISTDBY =5mA | 5 | ||
| TEMP pin high-side threshold | VTEMP-H | 80 | %Vcc | 5 | |||
| TEMP pin low-side threshold | VTEMP-L | 45 | %Vcc | 5 | |||
| Recharge threshold voltage | ΔVRECHRG | 150 | mV | VFLOAT - VRECHRG | 5 | ||
| Junction temperature in thermal regulation | TLIM | 120 | °C | 5 | |||
| Recharge comparator filter time | TRECHARGE | 1 | ms | VBAT 高至低 | 5 | ||
| Termination comparator filter time | TTERM | 1 | ms | IBAT 降至 ICHG/10 以下 | 5 | ||
| PROG pin pull-up current | IPROG | 0.5 | μA | 5 | |||
| Input overvoltage protection threshold (rising) | 6.5 | V | 输入过压保护（上升） | 5 | |||
| Input overvoltage protection hysteresis | 200 | mV | 迟滞 | 5 |
CAD (KiCad official)
- Symbol:
SE9450D-42-HF - Footprint:
Package_DFN_QFN:WDFN-8-1EP_2x2mm_P0.5mm_EP0.8x1.2mm - 3D model: WDFN-8-EP(2x2), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.75 mm nominal WSON height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files:
se9450d-42-hf-etched.step/se9450d-42-hf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);se9450d-42-hf.step/se9450d-42-hf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Seaward Elec datasheet (14 pp, sha256
8a53ce8ea33ee242, retrieved 2026-10-19, 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).