component
BL8531CC3TR33
Public Made by Adomby adom
BL Shanghai Belling DC-DC Converters, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownBL8531CC3TR33
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bl8531cc3tr33.step/bl8531cc3tr33.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).