# KIA1117BF33-RTF

**KEC Semicon** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · DPAK

KIA1117BF33-RTF from KEC Semicon, in a DPAK. 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(Adj) | power_in | Ground/adjust pin; in the adjustable version it sets the output through VOUT = VREF x (1 + R2/R1) + IADJ x R2, with adjust pin current typically 35 uA. |
| 2 | OUTPUT | power_out | Regulated output providing up to 1 A, with short circuit current limit of 1.1 A minimum and a minimum 10 uF capacitor (ESR 1 mOhm to 200 Ohm) required for stability. |
| 3 | INPUT | power_in | Unregulated input supply with a maximum rating of 15 V, and a typical dropout voltage of 1.1 V at 1 A output current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KEC Semicon |
| Package | DPAK |
| 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 (VIN=4.8V, IOUT=10mA) | VOUT1 | 3.234 | 3.3 | 3.366 | V | VIN=4.8V, IOUT=10mA | 2 |
| Output Voltage (10mA to 1A, 4.8V to 10V) | VOUT2 | 3.201 | 3.3 | 3.399 | V | 10mA IOUT 1A, 4.8V VIN 10V | 2 |
| Load Regulation | Reg Load |  | 0.5 | 1 | % | 10mA IOUT 1A, VIN=VOUT+2.0V | 2 |
| Line Regulation | Reg Line |  | 1 | 10 | mV | VOUT+1.5V VIN 10V, IOUT=10mA | 2 |
| Quiescent Current | IB1 |  | 5 | 10 | mA | VIN=VOUT+1.25V, IOUT=0A | 2 |
| Short Circuit Current Limit | ISC | 1.1 |  |  | A | VIN=VOUT+2.0V | 2 |
| Ripple Rejection | RR | 60 | 80 |  | dB | IOUT=40mA, f=120Hz, Vripple=1Vp-p, VIN=VOUT+3V | 2 |
| Dropout Voltage | VD |  | 1.1 | 1.4 | V | IOUT=1A | 2 |
| Input Voltage | VIN |  |  | 15 | V |  | 1 |
| Output Current | IOUT |  |  | 1 | A |  | 1 |
| Power Dissipation 1 | PD1 |  |  | 1.3 | W | No heatsink, DPAK (F-type) package; mounted on FR-4 PCB per note | 1 |
| Power Dissipation 2 | PD2 |  |  | 13 | W | Infinite heatsink, DPAK (F-type) package | 1 |
| Maximum Junction Temperature | Tj(max) |  |  | 150 | °C |  | 1 |
| Operating Junction Temperature | Topr | -40 |  | 150 | °C |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | °C |  | 1 |
| Thermal Resistance Junction-to-Case | Rth(j-c) |  | 9.62 |  | °C/W | Infinite heatsink (TC=Ta), DPAK (F-type) | 5 |
| Thermal Resistance Junction-to-Ambient | Rth(j-a) |  | 96.2 |  | °C/W | No heatsink, DPAK (F-type) | 5 |

## CAD (KiCad official)

- Symbol: `KIA1117BF33-RTF`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: DPAK (KiCad packages3D, STEP)
- 3D model files: `kia1117bf33-rtf-etched.step` / `kia1117bf33-rtf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kia1117bf33-rtf.step` / `kia1117bf33-rtf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KEC Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603068118931415040) (7 pp, sha256 `63fb9a022402fdaa`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/kia1117bf33-rtf-datasheet.pdf)