# 4A2D

**Shenzhen Fuman** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5

4A2D from Shenzhen Fuman, in a SOT-23-5. 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 | VIN | power_in | Voltage input. Operating range 2.0V to 6.0V. Bypass with a 1uF ceramic capacitor (CIN) to GND close to the pin. |
| 2 | GND | power_in | Ground reference for the regulator. Common return for input and output capacitors. |
| 3 | CE | input | Chip Enable. Drive high (VCEH >= 1.0V) to enable regulator; drive low (VCEL <= 0.7V) to shut down (shutdown current ~0.1uA typ). Do not leave floating. |
| 4 | NC | unconnected | No connect. Leave floating (typical application shows this pin unconnected). |
| 5 | VOUT | power_out | Regulated voltage output. Factory-set to 3.3V (±2%) for the 4A2D variant. Requires a 1uF ceramic output capacitor (CL) to GND. Max output current 500mA; short-circuit current ~150mA typ. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Fuman |
| Package | SOT-23-5 |
| Category | PMIC |
| Pins | 5 |

## Ordering variants

- `4A2D`

## 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 (effective) VOUT(E) - lower factor | VOUT(E) | 0.98 |  |  | V | IOUT=30mA, VIN=VOUT+1V | 6 |
| Output voltage (effective) VOUT(E) - upper factor | VOUT(E) |  |  | 1.02 | V | IOUT=30mA, VIN=VOUT+1V | 6 |
| CE pin high-level input voltage (start up) | VCEH | 1 |  |  | V | Statr up | 6 |
| CE pin low-level input voltage (shut down) | VCEL |  |  | 0.7 | V | Shut down | 6 |
| Load regulation | △VOUT |  |  | 9 | mV | VIN=VOUT+1V, 1mA≤IOUT≤100mA | 6 |
| Dropout voltage VDIF1 | VDIF1 |  |  | 120 | mV | IOUT=100mA | 6 |
| Dropout voltage VDIF2 | VDIF2 |  |  | 260 | mV | IOUT=200mA | 6 |
| Shutdown current | ICEL |  |  | 0.1 | uA | VCE=0V | 6 |
| Ripple rejection PSRR at 1 kHz | PSRR | 70 |  |  | dB | VIN=VOUT+1V, 1Vp-p AC, IOUT=10mA, 1KHz | 6 |
| Ripple rejection PSRR at 10 kHz (100mA) | PSRR | 60 |  |  | dB | VIN=VOUT+1V, 1Vp-p AC, IOUT=100mA, 10KHz | 6 |
| Ripple rejection PSRR at 10 kHz (200mA) | PSRR | 60 |  |  | dB | VIN=VOUT+1V, 1Vp-p AC, IOUT=200mA, 10KHz | 6 |
| Maximum output current | IOUTMAX |  | 500 |  | mA | VIN=VOUT+1V | 6 |
| Quiescent current | ISS |  | 55 |  | uA | VIN=VOUT+1V | 6 |
| Line regulation |  |  | 0.05 |  | %/V | IOUT=40mA, VOUT+1V≤VIN≤6.5V | 6 |
| Output noise voltage | EN |  | 50 |  | uVrms | IOUT=40mA, 300Hz~50KHz | 6 |
| Short-circuit current | ISHORT |  | 150 |  | mA | VIN=VOUT+1V, VCE=VIN, VOUT=0V | 6 |
| Input voltage operating range | VIN | 2 |  | 6 | V |  | 1 |

## CAD (KiCad official)

- Symbol: `4A2D`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `4a2d-etched.step` / `4a2d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `4a2d.step` / `4a2d.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`4a2d.step`](4a2d.step) | 85 KB | You want the bare part, or you mark your own boards. |
| [`4a2d-etched.step`](4a2d-etched.step) | 878 KB | You want the part with `4A2D` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 227 faces against 102 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [Shenzhen Fuman datasheet](docs/4a2d-datasheet.pdf) (9 pp, sha256 `2347c805ea8a986b`, 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/4a2d-datasheet.pdf)