# BL1118CS8TRAD33

**BL Shanghai Belling** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · ESOP-8-EP

BL1118CS8TRAD33 from BL Shanghai Belling, in a ESOP-8-EP. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND/ADJ | power_in | Channel 1 ground (fixed-output version) or adjust pin (adjustable version). In the adjustable configuration, this pin is tied to the resistor divider midpoint; the regulator forces 1.25V between Vout1 and this pin. Adjust-pin current is typically 55uA (max 120uA). |
| 2 | Vin1 | power_in | Channel 1 input supply. Operating range up to 12V max. Bypass with a 10uF input capacitor (tantalum, electrolytic, or MLCC) close to the pin. |
| 3 | GND/ADJ | power_in | Channel 2 ground (fixed-output version) or adjust pin (adjustable version). In the adjustable configuration this pin is the feedback node driven to 1.25V above the corresponding output. |
| 4 | Vin2 | power_in | Channel 2 input supply. Operating range up to 12V max. Bypass with a 10uF input capacitor close to the pin. Pin configuration is customizable on demand so both channels can share a single input. |
| 5 | Vout2 | power_out | Channel 2 regulated output. Tied together with pin 6 to share current up to 1A. Requires a 10uF output capacitor. |
| 6 | Vout2 | power_out | Channel 2 regulated output (paralleled with pin 5). Fixed at 1.2/1.8/2.5/3.3/5V per ordering code, or set by external divider on the ADJ variant. 1A maximum with typical 1.3V dropout. |
| 7 | Vout1 | power_out | Channel 1 regulated output (paralleled with pin 8). Requires a 10uF output capacitor. 1A maximum with typical 1.3V dropout. |
| 8 | Vout1 | power_out | Channel 1 regulated output (paralleled with pin 7). Fixed at 1.2/1.8/2.5/3.3/5V per ordering code, or set by external divider on the ADJ variant. |
| 9 | EP | power_in | Exposed thermal pad on the underside of the ESOP-8 package. Solder to a ground copper pour for heat dissipation; theta-JC = 10 C/W, theta-JA = 63 C/W. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BL Shanghai Belling |
| Package | ESOP-8-EP |
| Category | PMIC |
| Pins | 9 |

## Ordering variants

- `BL1118CS8TRAD33`
- `BL1118CS8TRAD33CS8TR3333`
- `BL1118CS8TRAD33CS8TRADAD`

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reference Voltage (ADJ channel) | Vref | 1.225 | 1.25 | 1.275 | V | 10mA≤Iout≤1A, Vin=3.25V | 3 |
| Output Voltage (3.3V channel) | Vout | 3.234 | 3.3 | 3.366 | V | 0≤Iout≤1A, Vin=5.3V | 3 |
| Line Regulation (ADJ channel) | ΔVout |  | 0.1 | 0.2 | %/V | Iout=10mA, 2.75V≤Vin≤12V | 3 |
| Line Regulation (3.3V channel) | ΔVout |  | 0.1 | 0.2 | %/V | Iout=10mA, 4.8V≤Vin≤12V | 3 |
| Load Regulation (ADJ channel) | ΔVout |  | 10 | 30 | mV | Vin =2.75V, 10mA≤Iout≤1A | 3 |
| Load Regulation (3.3V channel) | ΔVout |  | 10 | 30 | mV | Vin=4.8V, 10mA≤Iout≤1A | 3 |
| Dropout Voltage | Vdrop |  | 1.23 | 1.3 | V | Iout=100mA | 4 |
| Dropout Voltage | Vdrop |  | 1.3 | 1.5 | V | Iout=1A | 4 |
| Current Limit | Ilimit |  | 1 |  | A | Vin-Vout=2V, Tj=25°C | 4 |
| Minimum Load Current (ADJ channel) | Imin |  | 2 | 10 | mA |  | 4 |
| Quiescent Current (3.3V channel) | Iq |  | 2 | 5 | mA | Vin =12V | 4 |
| Adjust Pin Current (ADJ channel) | IAdj |  | 55 | 120 | uA | Vin =5V, 10mA≤Iout≤1A | 4 |
| Adjust Pin Current Change (ADJ channel) | Ichange |  | 0.2 | 10 | uA | Vin =5V, 10mA≤Iout≤1A | 4 |
| Temperature Coefficient | ΔV/ΔT | -100 |  | 100 | ppm |  | 4 |
| Junction-Ambient Thermal Resistance (ESOP-8) | JA |  | 63 |  | °C/W | ESOP-8 | 4 |
| Max Input Voltage |  |  |  | 12 | V |  | 2 |
| Operating Junction Temperature (Tj) | Tj |  |  | 125 | C |  | 2 |
| Ambient Temperature (Ta) | Ta | -20 |  | 85 | C |  | 2 |
| Package Thermal Resistance (junction-case) |  |  |  | 10 | C/W | ESOP8 | 2 |
| Storage Temperature (Ts) | Ts | -40 |  | -150 | C |  | 2 |
| Lead Temperature |  |  |  | 260 | C | 10S | 2 |
| Input Voltage Range |  |  |  | 12 | V |  | 2 |
| Ambient Temperature |  | -20 |  | 85 | C |  | 2 |

## CAD (KiCad official)

- Symbol: `BL1118CS8TRAD33`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`
- 3D model: ESOP-8-EP (KiCad packages3D, STEP)
- 3D model files: `bl1118cs8trad33-etched.step` / `bl1118cs8trad33-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bl1118cs8trad33.step` / `bl1118cs8trad33.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BL Shanghai Belling datasheet](docs/bl1118cs8trad33-datasheet.pdf) (8 pp, sha256 `85526dbc6c09a729`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/bl1118cs8trad33-datasheet.pdf)