MT9201 from Aerosemi, in a SOT-23-6. 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	SW	output	Switching node. Drain of the internal N-channel power MOSFET; connect to the switched side of the external boost inductor and the anode of the external Schottky diode. High impedance while the part is shut down. Absolute max SW voltage is 30V.
2	GND	power_in	Ground pin. Provides the return for the internal power NMOS source, control circuitry, and the external RCS current-sense resistor. Tie to a solid ground plane for both thermal dissipation and switching-noise integrity.
3	FB	input	Current-sense feedback input. Regulated to 200mV (194mV / 206mV min/max) against the internal reference. Connect the bottom of the LED string through a sense resistor RCS to GND to set LED current: I_LED = 0.2V / RCS. Absolute max 6V.
4	EN	input	Enable and PWM dimming input. Pull above 1.5V to enable the IC; below 0.4V shuts it down (<1uA). Accepts a 20kHz-1MHz unfiltered PWM dimming waveform so that average LED current is proportional to duty cycle. Leakage ±1uA typical, absolute max 6V.
5	OV	input	Over-voltage sense input. Connect to the top of the LED string / VOUT. When VOUT rises above the 28V OVP threshold (open-LED condition) the internal NMOS is turned off to protect the boost stage.
6	VIN	power_in	Power supply input, 3V to 24V operating range (25V absolute max). Powers the control logic and the internal boost NMOS via the external inductor. Must be decoupled to GND with a >=1uF ceramic capacitor placed close to the pin. UVLO ~2.6V with 100mV hysteresis.

Key specifications

Parameter	Value
Manufacturer	Aerosemi
Package	SOT-23-6
Category	LED-drv
Pins	6

Ordering variants

Same part, different packaging or reel option.

MT9201

CAD (KiCad official)

Symbol: MT9201
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mt9201.step`	97 KB	You want the bare part, or you mark your own boards.
`mt9201-etched.step`	1.3 MB	You want the part with `MT9201` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 327 faces against 117 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Aerosemi datasheet (10 pp, sha256 fb919c117aab647e, 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