component
SE3578
Public Made by Adomby adom
Seaward Elec DC-DC Converters, SOP-8-EP. 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
markdownSE3578
Seaward Elec · DC-DC Converters · SOP-8-EP
SE3578 from Seaward Elec, in a SOP-8-EP. 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 | SW | passive | Converter switch pin for the inductor connection, with an absolute maximum of 6.5 V. |
| 2 | SW | passive | Converter switch pin for the inductor connection, with an absolute maximum of 6.5 V. |
| 3 | VBAT | power_in | Converter supply voltage input, 2.5 V to 4.2 V operating, with UVLO rising at 2.7 V and falling at 2.5 V, and an absolute maximum of 6.5 V. |
| 4 | EN | input | Device enable control input, with a high level of 0.76 V to 5 V and a low level of 0 V to 0.72 V. |
| 5 | GND | power_in | Ground. |
| 6 | FB | input | Converter feedback input, regulating to 1.245 V typical (1.22 V to 1.269 V) through an external resistor divider. |
| 7 | VOUT | power_out | Converter output and IC supply voltage, with a 5.2 V maximum output voltage. |
| 8 | VOUT | power_out | Converter output and IC supply voltage, with a 5.2 V maximum output voltage. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Seaward Elec |
| Package | SOP-8-EP |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| FB Regulation Voltage | VFB | 1.22 | 1.245 | 1.269 | V | 5 | |
| VBAT Pin Voltage | VBAT | 2.5 | 4.2 | V | 5 | ||
| Output Voltage | Vout | 5.2 | V | 5 | |||
| Input Quiescent current | IBAT | 250 | μA | Vbat=3.6V FB=2V No load, no switch | 5 | ||
| Shutdown supply current | IBAT(SHUNT) | 5 | μA | EN=0 | 5 | ||
| FB input current | IFB | 100 | nA | VFB=1V | 5 | ||
| VOUT Leakage Current | IPVOUT_SW | 5 | μA | Vout=5V EN=0 | 5 | ||
| SW Leakage Current | ISW | 5 | μA | Vout=5V EN=0 | 5 | ||
| EN input High Level | EN | 0.76 | 5 | V | 5 | ||
| EN input Low Level | EN | 0 | 0.72 | V | 5 | ||
| Operating Junction Temperature | TJ | -20 | 125 | ℃ | 4 | ||
| Operating Ambient Temperature | TA | -20 | 85 | ℃ | 4 | ||
| Storage Temperature | Ts | -65 | 150 | ℃ | 4 | ||
| Lead Temperature | 260 | ℃ | less than 15 seconds | 4 | |||
| SW Pin Voltage | SW | 6.5 | V | 4 | |||
| VBAT Pin Voltage | VBAT | 6.5 | V | 4 | |||
| FB Pin Current | FB | 6 | V | 4 | |||
| VOUT Pin Current | VOUT | 6 | V | 4 | |||
| Human Body Mode | HBM | 2000 | V | 4 | |||
| Machine Mode | MM | 200 | V | 4 | |||
| Switch Frequency | Fosc | 0.5 | MHZ | 5 | |||
| Soft-start | SS | 2 | ms | 5 | |||
| Short circuit Current | IShort | 200 | mA | VBAT=3.6V Vout=0V | 5 | ||
| Maximum Duty Cycle | DMAX | 90 | % | FB=0.95V | 5 | ||
| Switch ON Resistance N | Ron-N | 39 | mΩ | 5 | |||
| Switch ON Resistance P | Ron-P | 42 | mΩ | 5 | |||
| Peak Current Limit | Ilim | 6.5 | A | EN=1 | 5 | ||
| Efficiency | Efficiency | 87 | % | EN=1 VBAT=3V Vout=5V Iout =2A | 5 | ||
| VBAT uvlo Threshold Falling Edge | Vuvlo | 2.5 | V | Falling Edge | 5 | ||
| VBAT uvlo Threshold Rising Edge | Vuvlo | 2.7 | V | Rising Edge | 5 | ||
| Thermal Shutdown Threshold | Temp | 150 | ℃ | Rising Edge | 5 |
CAD (KiCad official)
- Symbol:
SE3578 - Footprint:
Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm - 3D model: SOP-8-EP (KiCad packages3D, STEP)
- 3D model files:
se3578-etched.step/se3578-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);se3578.step/se3578.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Seaward Elec datasheet (7 pp, sha256
a960a2fd942b7878, retrieved 2026-10-22, 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), 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).