# TL1963A-33DCYR

**Texas Instruments** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223

TL1963A-33DCYR from Texas Instruments, in a SOT-223. 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 | IN | power_in | Regulator input supply. Accepts up to 20 V and up to VOUT+VDO minimum. A 1-uF to 10-uF bypass capacitor is required (especially when placed more than ~6 inches from the input filter cap). Reverse-battery tolerant. |
| 2 | GND | power_in | Ground reference for the regulator. The DCY package brings GND out on pin 2 as well as on the tab (pin 4). |
| 3 | OUT | power_out | Regulated 3.3-V output, 1.5-A capable. Requires a minimum 10-uF ceramic output capacitor for stability; larger caps recommended for large transient loads. |
| 4 | GND (Tab) | power_in | SOT-223 thermal tab, electrically connected to GND. Must be soldered to a PCB copper pour for rated thermal performance. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-223 |
| Category | PMIC |
| Pins | 4 |

## Ordering variants

Same part, different packaging or reel option.

- `TL1963A-33DCYR`
- `TL1963A-33DCYRDCQ`
- `TL1963A-33DCYRDCQR`
- `TL1963A-33DCYRKTT`
- `TL1963A-33DCYRKTTR`
- `TL1963A-33DCYRKTTT`

## CAD (KiCad official)

- Symbol: `TL1963A-33DCYR`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files: `tl1963a-33dcyr-etched.step` / `tl1963a-33dcyr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl1963a-33dcyr.step` / `tl1963a-33dcyr.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/tl1963a-33dcyr.pdf) (39 pp, sha256 `4d78d60ab065db02`, retrieved 2026-08-17, tier: manufacturer)
- **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/tl1963a-33dcyr-datasheet.pdf)