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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206

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BL8531CC3TR33

BL Shanghai Belling · DC-DC Converters · SOT-89-3

BL8531CC3TR33 from BL Shanghai Belling, in a SOT-89-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	GND	power_in	Ground pin of the converter.
2	OUT	power_in	Output feedback pin that also supplies the internal circuitry; absolute maximum -0.3V to 12V.
3	LX	passive	Switching pin connected to the inductor and Schottky diode; absolute maximum -0.3V to 6.5V and 0.7A output current.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOT-89-3
Category	Power Management (PMIC)
Pins	3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Output Voltage (3.3V variant)	Vout	3.234	3.3	3.366	V		3
Input Current	Iin		12	15	uA	Iout=0mA, Vin=Vout*0.6	3
Start-up voltage	Vstart		0.8	0.9	V	Iout=1mA, Vin: 0→2V	3
Hold-on voltage	Vhold		0.6	0.7	V	Iout=1mA, Vin: 2→0V	3
Quiescent current drawn from power source	IDD		4	7	uA	Without external components, Vout=Vout×1.05	3
LX leakage current	ILXleak		0.5	5	uA	Vout=Vlx=6.5V	3
CE H threshold voltage (rising)	VCEH	0.8			V	VCE: 0→2V	3
CE H threshold voltage (falling)	VCEL			0.3	V	VCE: 2→0V	3
Oscillator duty cycle	Maxdty	70	75	80	%	On (Vlx "L") side	3
Oscillator frequency	Fosc		400		kHz	LX on "L" side, Vout=Vout*0.96	3
Switch ON resistance	Rswon		0.5		Ω		3
Efficiency	η		85		%		3
Input Voltage Range (recommended)		0.8			V	Recommended: Vout	3
Inductor	L	10	27	100	μH		3
Input Capacitor	Cin	0			μF		3
Output Capacitor	Cout	47	100	220	μF		3
Ambient Temperature (recommended)	Ta	-40		85	°C		3
Output voltage range		-0.3		12	V		2
LX Voltage		-0.3		6.5	V		2
CE Pin Voltage		-0.3			V		2
Lx Pin Output Current				0.7	A		2
Operating Junction Temperature	Tj			125	°C		2
Ambient Temperature (absolute maximum)	Ta	-40		85	°C		2
Storage Temperature	Ts	-40		150	°C		2
Lead Temperature				260	°C	10 s	2
Power Dissipation (SOT-89-3)	PD			500	mW	SOT-89-3 package	2

CAD (KiCad official)

Symbol: BL8531CC3TR33
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89-3 (KiCad packages3D, STEP)
3D model files: bl8531cc3tr33-etched.step / bl8531cc3tr33-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bl8531cc3tr33.step / bl8531cc3tr33.glb are the bare package body.

Provenance

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

Datasheet: BL Shanghai Belling datasheet (10 pp, sha256 101c5e9f3cdd194d, retrieved 2026-10-17, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF