# TL3843BDR

**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-14

TL3843BDR from Texas Instruments, in a SOIC-14. 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 | COMP | bidirectional | Error amplifier compensation pin for frequency and gain adjustment. |
| 2 | NC | unconnected | No internal connection. |
| 3 | VFB | input | Error amplifier input for feedback voltage control loop (0-5.5V). |
| 4 | NC | unconnected | No internal connection. |
| 5 | ISENSE | input | Current sense comparator input for load current monitoring (0-5.5V). |
| 6 | NC | unconnected | No internal connection. |
| 7 | RT/CT | bidirectional | Oscillator timing capacitor pin for frequency setting via RC network (0-5.5V). |
| 8 | POWER GROUND | power_in | Output PWM ground terminal for the output stage. |
| 9 | GND | power_in | Device control logic ground terminal. |
| 10 | OUTPUT | output | PWM output stage for driving N-channel MOSFETs up to ±1A peak (0-30V). |
| 11 | VC | power_in | Output PWM stage positive supply voltage (0-30V). |
| 12 | VCC | power_in | Device control logic positive supply voltage (0-30V). |
| 13 | NC | unconnected | No internal connection. |
| 14 | VREF | power_in | Oscillator reference voltage output at 5V nominal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-14 |
| Category | Power Management (PMIC) |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `TL3843BDR`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `tl3843bdr-etched.step` / `tl3843bdr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl3843bdr.step` / `tl3843bdr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/tl3843b.pdf) (31 pp, sha256 `42e42dc7a6e780d9`, retrieved 2026-10-03, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/tl3843bdr-datasheet.pdf)