# TL4050B41QDBZR

**Texas Instruments** · Voltage Reference · SOT-23-3

TL4050B41QDBZR from Texas Instruments, in a SOT-23-3. 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 | CATHODE | passive | Cathode (K) terminal of the shunt voltage reference. Sinks the regulated cathode current (IZ) - recommended operating range 60μA to 15mA - while maintaining VZ = 4.096V above the anode. Absolute maximum continuous cathode current is -10mA to +20mA. |
| 2 | ANODE | passive | Anode (A) terminal of the shunt voltage reference; the low-side / ground return of the two-terminal reference. VZ (4.096V) is developed between CATHODE and ANODE. |
| 3 | NC | unconnected | No internal connection. A parasitic Schottky diode exists between pin 2 (Anode) and pin 3, so pin 3 MUST be left floating or tied to pin 2 (Anode). In applications with high EMI or significant high-frequency switching noise, TI recommends tying this pin to Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `TL4050B41QDBZRIDBZR`
- `TL4050B41QDBZRIDBZT`
- `TL4050B41QDBZR`
- `TL4050B41QDBZT`
- `TL4050B41QDBZRIDCKR`
- `TL4050B41QDBZRIDCKT`
- `TL4050B41QDBZRQDCKR`
- `TL4050B41QDBZRQDCKT`

## CAD (KiCad official)

- Symbol: `TL4050B41QDBZR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `tl4050b41qdbzr-etched.step` / `tl4050b41qdbzr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl4050b41qdbzr.step` / `tl4050b41qdbzr.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/cn/lit/gpn/tl4050a) (None pp, sha256 `d043c5224a893bec`, retrieved 2026-08-17, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/tl4050b41qdbzr-datasheet.pdf)