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se3837b

Public Made by Adom

by adom

Seaward Elec DC-DC Converters, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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SE3837B

Seaward Elec · DC-DC Converters · SOP-8

SE3837B from Seaward Elec, in a SOP-8. 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 CS input Output current sense pin. Constant current is set by an external sense resistor Rcs from Vout- to GND: Iout = Vse/Rcs, where Vse depends on the grade (A: 105 mV, B: 120 mV, C: 140 mV, ±6%). Absolute maximum voltage 6.5 V.
2 FB input Voltage feedback pin. Sense output voltage via an external resistor divider; internal reference is 1.25 V, so Vout = 1.25 * (1 + R2/R1). Absolute maximum voltage 6.5 V; SCP triggers when Vfb < 0.3 V.
3 VDD power_out Internal LDO / bypass capacitor pin for the on-chip voltage regulator. Requires a 10 uF ceramic bypass capacitor to GND. Absolute maximum 6.5 V; not intended to drive external loads.
4 VIN power_in Main power supply input, DC 4.5-40 V wide range. Requires an electrolytic bulk capacitor plus a ceramic decoupling capacitor to GND to suppress switching noise. UVLO threshold typ 4 V; absolute maximum 40 V.
5 SW power_out Power switch output node. Connects to the source of the internal high-side MOSFET and drain of the low-side MOSFET; drive an external inductor to VOUT. Rds(on) high-side ~46 mΩ, low-side ~22 mΩ; typical peak current limit 3.5 A. Absolute maximum 40 V.
6 SW power_out Power switch output node (tied to pin 5). Connects to the source of the internal high-side MOSFET and drain of the low-side MOSFET; drive an external inductor to VOUT. Absolute maximum 40 V.
7 GND power_in Ground return pin (tied to pin 8). Both GND pins must connect to the board ground plane; they also serve as the primary thermal path from the die.
8 GND power_in Ground return pin (tied to pin 7). Both GND pins must connect to the board ground plane; they also serve as the primary thermal path from the die.

Key specifications

Parameter Value
Manufacturer Seaward Elec
Package SOP-8
Category PMIC
Pins 8

Ordering variants

  • SE3837B-HF

CAD (KiCad official)

  • Symbol: SE3837B
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: se3837b-etched.step / se3837b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); se3837b.step / se3837b.glb are the bare package body.

Provenance

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

  • Datasheet: Seaward Elec datasheet (None pp, sha256 0529a59a80e5f669, retrieved 2026-08-17, 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: 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).

Datasheet PDF

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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