# AX6601-18RA

**Axelite Tech** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23

AX6601-18RA from Axelite Tech, in a SOT-23. 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 | GND | power_in | Ground reference for the regulator. Connect to system ground with a low-impedance return path near the input and output decoupling capacitors. |
| 2 | VOUT | power_out | Regulated fixed output voltage (1.8V for the -18 option). Sources up to 300mA. Requires a minimum 2.2µF ceramic capacitor (X5R/X7R) to GND within 1cm for stability. |
| 3 | VIN | power_in | Unregulated input supply, 2.6V to 6V absolute range (must be VOUT + dropout to regulate). Decouple with a 1µF ceramic capacitor to GND placed within 1cm of the pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Axelite Tech |
| Package | SOT-23 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `AX6601-18RA`
- `AX6601-18RA18F`
- `AX6601-18RA18FA`

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Voltage | VIN | 2.6 |  | 6 | V | (Note 1) | 3 |
| Output Voltage Accuracy (VOUT≧1.80V) | ΔVOUT | -3 |  | 3 | % | VIN=VOUT+0.1V to 6V, VOUT≧1.80V, IOUT=1mA | 3 |
| Dropout Voltage (VOUT=1.80V) | VDROP |  | 0.8 | 1 | V | IOUT=300mA, VOUT=1.80V | 3 |
| Load Regulation | ΔVLOAD |  |  | 0.02 | %/mA | IOUT=10m~300mA | 3 |
| Current Limit | ILIMIT | 350 | 600 |  | mA | (Note 4) | 3 |
| VIN Pin Voltage (absolute maximum) | VIN | -0.3 |  | 6.5 | V | Referenced to GND (GND - 0.3 to GND + 6.5) | 3 |
| Output Voltage (absolute maximum) | VOUT | -0.3 |  |  | V | Referenced to GND; upper limit printed as VIN + 0.3 V | 3 |
| Power Dissipation SOT-23-3L | PD |  |  | 400 | mW | SOT-23-3L package | 3 |
| Storage Temperature Range | TST | -40 |  | 150 | ºC |  | 3 |
| Operating Junction Temperature | TJ | -40 |  | 125 | ºC |  | 3 |
| Thermal Resistance Junction to Case SOT-23-3L | θJC |  | 180 |  | ºC/W | SOT-23-3L package | 3 |
| Thermal Resistance Junction to Ambient SOT-23-3L | θJA |  | 250 |  | ºC/W | SOT-23-3L; Note: PCB copper area approximately 1 in2 (multi-layer) | 3 |

## CAD (KiCad official)

- Symbol: `AX6601-18RA`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ax6601-18ra-etched.step` / `ax6601-18ra-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ax6601-18ra.step` / `ax6601-18ra.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Axelite Tech datasheet](docs/ax6601-18ra-datasheet.pdf) (9 pp, sha256 `2940dce92928e0da`, retrieved 2026-08-17, tier: lcsc)
- **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/ax6601-18ra-datasheet.pdf)