# BL78L33

**GME(银河微电)** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89

BL78L33 from GME(银河微电), in a SOT-89. 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 | VO | power_out | Regulated 3.3 V output (BL78L33, 3.135 V to 3.465 V over line and load), up to 100 mA maximum output current, with a 0.1 µF output capacitor CO shown in the application circuit. |
| 2 | GND | power_in | Ground reference for the regulator, connected to the common return of the input capacitor C1 and the output capacitor CO. |
| 3 | VI | power_in | Unregulated input voltage, absolute maximum 30 V for the 78L33 to 78L09 versions, with a 0.33 µF input capacitor C1 shown in the application circuit. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | GME(银河微电) |
| Package | SOT-89 |
| 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 (Tj=25℃ row) | VO | 3.168 | 3.3 | 3.432 | V | Tj=25℃ | 2 |
| Output voltage (5.8V to 20V row) | VO | 3.135 |  | 3.465 | V | 5.8V≤Vi≤20V, IO=1mA-40mA | 2 |
| Output voltage (Vi=8.3V row) | VO | 3.135 |  | 3.465 | V | Vi=8.3V, IO=1mA-70mA | 2 |
| Load regulation | Regload |  |  | 60 | mV | Tj=25℃, IO=1mA-100mA | 2 |
| Load regulation | Regload |  |  | 30 | mV | Tj=25℃, IO=1mA-40mA | 2 |
| Line regulation | Regline |  |  | 150 | mV | 5.8V≤Vi≤20V, Tj=25℃ | 2 |
| Line regulation | Regline |  |  | 100 | mV | 6.3V≤Vi≤20V, Tj=25℃ | 2 |
| Quiescent current | IQ |  |  | 6 | mA | Tj=25℃ | 2 |
| Quiescent current | IQ |  |  | 5.5 | mA | Tj=125℃ | 2 |
| Quiescent current change | ΔIQ |  |  | 1.5 | mA | 6.3V≤Vi≤20V | 2 |
| Quiescent current change | ΔIQ |  |  | 0.1 | mA | 1mA≤IO≤40mA | 2 |
| Ripple rejection | RR | 41 | 49 |  | dB | IO=40mA, 6.3V≤Vi≤16.3V, f=120Hz, Tj=25℃ | 2 |
| Input voltage (78L33-78L09) | VI |  |  | 30 | V |  | 1 |
| Maximum output current | ICM |  |  | 100 | mA |  | 1 |
| Power dissipation | PD |  |  | 500 | mW | TA = 25C | 1 |
| Operating temperature range | TOPR | -40 |  | 125 | C |  | 1 |
| Junction temperature | TJ |  |  | 150 | C |  | 1 |
| Storage temperature range | TSTG | -65 |  | 150 | C |  | 1 |
| Thermal resistance junction-to-air | RθJA |  | 250 |  | °C/W |  | 1 |

## CAD (KiCad official)

- Symbol: `BL78L33`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `bl78l33-etched.step` / `bl78l33-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bl78l33.step` / `bl78l33.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [GME(银河微电) datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590921422392930304) (9 pp, sha256 `08fa1aef879d15b6`, retrieved 2026-10-18, 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](docs/bl78l33-datasheet.pdf)