MT9284-28J 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	Switch node. Drain of the integrated N-channel power MOSFET; connects to the switched side of the external boost inductor and to the anode of the external Schottky diode. Rated up to 30V absolute max; SW is high impedance during shutdown. On-resistance is 0.5Ω typical with a 1.5A peak current limit.
2	GND	power_in	Device ground and power return for the internal NMOS source. Should be tied to a strong ground plane for heat sinking and noise protection, with input/output ceramic capacitors returned close to this pin.
3	FB	input	Current-sense feedback input. Connect a sense resistor from FB to GND to program the LED current; the loop regulates VFB to 104mV typical (94-114mV), giving ILED = VFB / RCS. Absolute maximum -0.3V to 6V.
4	EN	input	Enable and PWM dimming input. Pull above 1.5V to enable the IC; below 0.4V shuts it down (<1µA). Accepts a 20kHz to 1MHz unfiltered PWM dimming signal to produce an average LED current proportional to the duty cycle. Absolute maximum -0.3V to 6V; leakage ±1µA max.
5	OV	input	Output overvoltage sense input. Connect to VOUT at the top of the LED string; the MT9284 turns off the internal NMOS when VOV exceeds 28V (typical), protecting against open-LED conditions.
6	VIN	power_in	Power supply input, 2.5V to 5.5V operating range (6V absolute max). Must be closely decoupled to GND with a 1µF or larger ceramic capacitor (4.7µF X5R/X7R recommended). Under-voltage lockout trips at 2.2V typical 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.

MT9284-28J
MT9284AS6
MT9284BS6
MT9284CS6

CAD (KiCad official)

Symbol: MT9284-28J
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
`mt9284-28j.step`	97 KB	You want the bare part, or you mark your own boards.
`mt9284-28j-etched.step`	2.1 MB	You want the part with `MT9284-28J` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 500 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 12c2a380fdd2a887, 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