# HX3033A-AFC

**HEXIN** · DC-DC Converters · SOT-23-6L

HX3033A-AFC from HEXIN, in a SOT-23-6L. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | AGND | power_in | Analog ground; the datasheet says to connect all analog grounds to a common node, which is then tied to the power ground behind the output capacitors. |
| 2 | SW | output | Switch node that connects the inductor between SW and VIN; keep its PCB trace short and wide to reduce EMI and voltage overshoot. |
| 3 | VDD | power_in | Output voltage sense input from which the NMOS switch gate drive is derived (the greater of VOUT and VIN); the EN pin must be tied to VDD, and the datasheet warns that EN should be inhibited when VDD may reach 5.5V or above. |
| 4 | EN | input | Logic-controlled ON/OFF input: high (VENH min 1 V) gives normal free-running operation and low (VENL max 0.6 V) gives shutdown. |
| 5 | FB | input | Feedback input to the gm error amplifier, connected to the resistor divider tap, with a reference voltage of 1.188 V to 1.236 V (1.212 V typical). |
| 6 | PGND | power_in | Power ground for the switching converter's output stage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HEXIN |
| Package | SOT-23-6L |
| Category | Power Management (PMIC) |
| Pins | 6 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage |  | -0.3 |  | 6 | V |  | 2 |
| SW Pin Switch Voltage |  | -0.3 |  | 22 | V |  | 2 |
| Other I/O Pin Voltages (upper limit printed as VDD+0.3V) |  | -0.3 |  |  | V | Upper limit printed as (VDD + 0.3V) | 2 |
| Operating Temperature Range |  | -40 |  | 85 | ℃ | Note 2: guaranteed 0℃ to 70℃; -40℃ to 85℃ assured by design, characterization and SPC | 2 |
| Maximum Junction Temperature |  |  |  | 150 | ℃ |  | 2 |
| Storage Temperature Range |  | -65 |  | 150 | ℃ |  | 2 |
| Lead Temperature (Soldering 10sec) |  |  |  | 265 | ℃ | Soldering 10 sec | 2 |
| Operating VDD Range | VDD | 2.5 |  | 5 | V | VDD Pin Voltage | 3 |
| Feedback Reference Voltage | VFB | 1.188 | 1.212 | 1.236 | V |  | 3 |
| Start-up Voltage | VSTART |  | 2.2 |  | V | IOUT = 1mA | 3 |
| Hold-up Voltage | VHOLD |  | 1.7 |  | V | IOUT = 1mA | 3 |
| Supply Current (Quiescent) | IQ |  | 692 |  | μA | VIN=2.5V | 3 |
| Supply Current (Quiescent) | IQ |  | 630 |  | μA | VIN=3.6V | 3 |
| Supply Current (Shutdown) | IOFF |  | 52 |  | μA | VEN=0V | 3 |
| FB Pin Bias Current | IFB |  | 100 |  | nA |  | 3 |
| EN High Threshold | VENH |  | 1 |  | V | VEN Rising | 3 |
| EN Low Threshold | VENL |  | 0.6 |  | V |  | 3 |
| EN Input Current | IEN |  | 8 |  | μA | VEN(H),VEN=2V | 3 |
| EN Input Current | IEN |  | 0.15 |  | μA | VEN(L),VEN=0.5V | 3 |
| Switching Frequency | FOSC |  | 400 |  | KHz | IOUT = 500mA | 3 |
| Frequency Change | ΔFOSC |  | 20 |  | KHz | VDD: 3V→5V | 3 |
| Maximum Duty | DC |  | 90 |  | % |  | 3 |
| SW ON Resistance | RSW |  | 300 |  | mΩ |  | 3 |
| Package Thermal Resistance (SOT-23-6L) | θJA |  | 220 |  | ℃/W | SOT-23-6L | 2 |

## CAD (KiCad official)

- Symbol: `HX3033A-AFC`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6L (KiCad packages3D, STEP)
- 3D model files: `hx3033a-afc-etched.step` / `hx3033a-afc-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `hx3033a-afc.step` / `hx3033a-afc.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HEXIN datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588912494408974336) (9 pp, sha256 `2025c37f1c804497`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/hx3033a-afc-datasheet.pdf)