# HT2451ARTZ

**HTCSEMI** · DC-DC Converters · SOT-23-6

HT2451ARTZ from HTCSEMI, in a SOT-23-6. 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 | BST | power_out | Bootstrap pin and positive supply for the internal floating high-side MOSFET driver; a bypass capacitor is connected between this pin and SW, and the bootstrap capacitor is held at about 5 V with the floating driver UVLO at about 2.4 V. |
| 2 | GND | power_in | Ground pin, to be connected as close as possible to the output capacitor and kept away from the high-current switching path. |
| 3 | FB | input | Feedback input to the error amplifier; an external divider from output to ground is compared with the internal +0.8 V reference (Vfb 0.778 V to 0.810 V for 4.0 V < Vin < 36 V) to set the regulated output. |
| 4 | EN | input | Enable input: pulling it below the specified threshold shuts the chip down, pulling it above the threshold enables operation, and leaving it floating disables the chip (EN high threshold 1.4 V min, 1.55 V typ, 1.7 V max). |
| 5 | VIN | power_in | Power input supplying all internal control circuits including the power switch, requiring a decoupling capacitor to ground to reduce switching spikes; operating input range is 3.3 V to 36 V. |
| 6 | SW | output | High-side switch output; a low-VF Schottky diode to ground should be placed close to this pin to reduce switching spikes. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `HT2451ARTZ`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `ht2451artz-etched.step` / `ht2451artz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht2451artz.step` / `ht2451artz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HTCSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589835987799994368) (9 pp, sha256 `4dbbf1ffc0150b1b`, retrieved 2026-10-09, 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:** 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/ht2451artz-datasheet.pdf)