component
BL8531CB3TR30
Public Made by Adomby adom
BL(Shanghai Belling) DC-DC Converters, SOT-23-3L. 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
markdownBL8531CB3TR30
BL(Shanghai Belling) · DC-DC Converters · SOT-23-3L
BL8531CB3TR30 from BL(Shanghai Belling), in a SOT-23-3L. 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_out | Output feedback pin that also supplies power to the internal circuitry, with an absolute maximum of Vout+0.3V and a recommended output capacitor of 47-220uF. |
| 3 | Lx | passive | Switching pin connected to the inductor and Schottky diode, with a maximum output current of 0.7A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | BL(Shanghai Belling) |
| Package | SOT-23-3L |
| Category | Power Supply Chip |
| 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 | VOUT | 2.94 | 3 | 3.06 | V | 3 | |
| Input voltage | VIN | 7 | 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 | 3 | |
| Hold-on voltage | VHOLD | 0.6 | 0.7 | V | IOUT=1mA | 3 | |
| Quiescent current drawn from power source | IDD | 4 | 7 | uA | Without external components, VOUT =VOUT×1.05 | 3 | |
| Switch ON resistance | RSWON | 0.4 | 0.5 | Ω | 3 | ||
| LX leakage current | ILXLEAK | 0.5 | 5 | uA | VOUT=VLX=6V | 3 | |
| Oscillator duty cycle | MAXDTY | 70 | 75 | 80 | % | On(VLX"L")side | 3 |
| Oscillator frequency | FOSC | 350 | KHz | LX on "L" side, VOUT=VOUT*0.96 | 3 | ||
| Efficiency | 85 | % | 3 | ||||
| Input voltage range | 0.8 | V | upper limit printed as VOUT | 3 | |||
| Inductor | 10 | 27 | 100 | μH | 3 | ||
| Input capacitor | 0 | 10 | μF | recommended ≥10 | 3 | ||
| Output capacitor | 47 | 100 | 220 | μF | 3 | ||
| Ambient temperature | TA | -40 | 85 | C | 3 | ||
| Input voltage range (abs max) | -0.3 | 12 | V | 2 | |||
| Input voltage (abs max) | -0.3 | V | upper limit printed as Vout+0.3 | 2 | |||
| Lx pin output current | 0.7 | A | 2 | ||||
| Operating junction temperature | TJ | 125 | C | 2 | |||
| Ambient temperature | TA | -40 | 85 | C | 2 | ||
| Power dissipation | 250 | mW | SOT-23-3 | 2 | |||
| Storage temperature | TS | -40 | 150 | C | 2 | ||
| Lead temperature & time | 260 | C | 10S | 2 | |||
| Output voltage temperature coefficient | 100 | ppm/℃ | 1 |
CAD (KiCad official)
- Symbol:
BL8531CB3TR30 - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files:
bl8531cb3tr30-etched.step/bl8531cb3tr30-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bl8531cb3tr30.step/bl8531cb3tr30.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: BL(Shanghai Belling) datasheet (11 pp, sha256
f28e740a06541198, retrieved 2026-10-22, 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).