# LM4041QCEM3-1.2NO

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

LM4041QCEM3-1.2NO 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 / negative terminal (-). Shunt current flows in here and the 1.225 V reference voltage is developed between this pin and the anode. Bias through a series resistor from the supply so the shunt current stays within 60 µA to 12 mA. |
| 2 | ANODE | passive | Anode / positive terminal (+). Normally tied to ground in a shunt-reference topology; forms the return for the 1.225 V reference developed across cathode-to-anode. |
| 3 | NC | unconnected | No internal connection. Must be left floating, or connected to the anode (+) pin. TI recommends tying to anode in high-EMI environments (e.g. near transformers) or where significant high-frequency switching noise is present. |

## 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.

- `LM4041QCEM3-1.2NO`
- `LM4041QCEM3-1.2NOIDBZ`
- `LM4041QCEM3-1.2NOQDBZ`
- `LM4041QCEM3-1.2NOIDCK`
- `LM4041QCEM3-1.2NOILP`
- `LM4041QCEM3-1.2NOILPR`
- `LM4041QCEM3-1.2NOILPE3`

## CAD (KiCad official)

- Symbol: `LM4041QCEM3-1.2NO`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `lm4041qcem3-1-2no-etched.step` / `lm4041qcem3-1-2no-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4041qcem3-1-2no.step` / `lm4041qcem3-1-2no.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/lm4041-n) (None pp, sha256 `cd8ea9cf52a32021`, 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/lm4041qcem3-1-2no-datasheet.pdf)