MEL7136AP5G from MICRONE, in a SOT-89-5. 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	CS	input	Current sense input. Connect the top of the external sense resistor REXT (from LED cathode / external MOSFET source to GND) here. The internal loop regulates VCS to 100 mV (typ; 95-105 mV), so ILED = 0.1 V / REXT.
2	D(LED)	output	LED sink (open-drain of internal NMOS). Connect to the cathode of the LED string. Sinks the regulated constant current (10 mA-1 A) down to REXT / CS. Absolute max VLED = -0.3 V to VDD+0.3 V.
3	VDD	power_in	Power supply input. Operating range 2.7 V to 18 V (absolute max 18 V). Bypass with 10 uF CIN close to the pin. Low-voltage protection releases at ~2.5 V (0.15 V hysteresis).
4	GND	power_in	Device ground reference and current-return path. Tie to the ground plane / bottom of REXT.
5	EXT	output	Gate drive for an optional external NMOS or NPN transistor used to extend current (>1 A) or voltage range. Absolute max VEXT = 6 V; typical drive swing 2.5-4.5 V (VDD=5 V, VCS=0 V). Leave floating when the internal driver alone is sufficient (light load configuration).

Key specifications

Parameter	Value
Manufacturer	MICRONE
Package	SOT-89-5
Category	LED-drv
Pins	5

Ordering variants

Same part, different packaging or reel option.

MEL7136AP5G
MEL7136AP5GASP
MEL7136AP5GBM5

CAD (KiCad official)

Symbol: MEL7136AP5G
Footprint: Package_TO_SOT_SMD:SOT-89-5
3D model: SOT-89-5 (KiCad packages3D, STEP)

Provenance

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

Datasheet: MICRONE datasheet (14 pp, sha256 6206ba4720a74412, 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