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BL9157-33BC3A
Public Made by Adomby adom
BL Shanghai Belling Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, 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
markdownBL9157-33BC3A
BL Shanghai Belling · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3
BL9157-33BC3A 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; must be connected to the ground plane for proper power dissipation. |
| 2 | VIN | power_in | Supply voltage input, operating up to 30V (absolute maximum 33V). |
| 3 | VOUT | power_out | Regulated output voltage (3.3V for this -33 option), up to 150mA 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 Accuracy | VOUT | -1 | 1 | % | IOUT=10mA | 3 | |
| Input Voltage | VIN | 30 | V | 3 | |||
| Maximum Output Current | 150 | mA | VIN=VOUT+2V | 3 | |||
| Dropout Voltage | VDROP | 650 | mV | IOUT=100mA, VOUT=5V | 3 | ||
| Dropout Voltage | VDROP | 1000 | mV | IOUT=150mA, VOUT=5V | 3 | ||
| Line Regulation | 0.02 | %/V | VIN = VOUT + 2V to 30V, IOUT=1mA | 3 | |||
| Load Regulation | ΔVOUT | 7 | mV | 1mA<IOUT<150mA, VIN=VOUT+2V | 3 | ||
| Output Voltage Temperature Coefficient | TCVOUT | -100 | 100 | ppm/℃ | IOUT=1mA | 3 | |
| Maximum Input Voltage | 33 | V | 3 | ||||
| Maximum Junction Temperature | 150 | °C | 3 | ||||
| Storage Temperature Range | -65 | 125 | °C | 3 | |||
| Package Thermal Resistance | θJA | 100 | ℃/W | SOT89-3 | 3 | ||
| Operating Temperature Range | -40 | 85 | °C | 3 | |||
| Transient Load Current at Start-up | 50 | mA | VIN between 24V and 30V, at start-up | 4 | |||
| Quiescent Current | IQ | 2 | A | IOUT=0mA | 3 | ||
| Power Supply Rejection Ratio | PSRR | -60 | dB | f=217Hz, IOUT=10mA, VOUT=5V | 3 | ||
| Power Supply Rejection Ratio | PSRR | -50 | dB | f=1KHz | 3 | ||
| Thermal Shutdown Temperature | TSD | 145 | ℃ | 3 | |||
| Thermal Shutdown Hysteresis | TSDHY | 30 | ℃ | 3 |
CAD (KiCad official)
- Symbol:
BL9157-33BC3A - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files:
bl9157-33bc3a-etched.step/bl9157-33bc3a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bl9157-33bc3a.step/bl9157-33bc3a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: BL Shanghai Belling datasheet (5 pp, sha256
79e1bc9720aabf8c, retrieved 2026-10-18, 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).