component

STI3408B

Public Unreviewed

by Ray

TMI DC-DC Converters, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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PCB Footprint

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Datasheet

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Contents

README

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STI3408B

TMI · DC-DC Converters · SOT-23-5

STI3408B from TMI, in a SOT-23-5. 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 EN input Chip enable pin. Drive EN above 1.5V to turn on the part; drive below 0.3V to turn it off. Must not be left floating.
2 GND power_in Device ground return pin.
3 LX power_out Power switch output (switching node). Connects to the external inductor. LX absolute rating -0.3V to 6.5V (transient tolerant to -3.5V/+7.5V for <5ns).
4 VIN power_in Power supply input, 2.5V to 6.0V operating range (6.5V OVP threshold, absolute max 6.5V). Must be closely decoupled to GND with a 4.7µF or greater ceramic capacitor.
5 FB input Output voltage feedback pin. External resistor divider from VOUT sets the regulated output; internal reference is 0.6V (±2% at 25°C). Minimum recommended lower-leg resistor R2 = 59kΩ for noise immunity.

Key specifications

Parameter Value
Manufacturer TMI
Package SOT-23-5
Category PMIC
Pins 5

CAD (KiCad official)

  • Symbol: STI3408B
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: TMI datasheet (9 pp, sha256 3cccd9c294197141, 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).

Datasheet PDF