# HT44-Q

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

HT44-Q from QNH, in a SOT-23. 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 | GND | power_in | Ground pin of the regulator; the output capacitor of greater than 2.2µF must be connected from VOUT to ground. |
| 2 | VOUT | power_out | Regulated 4.4V output (HT44) rated for 100mA minimum output current, needing an output capacitor greater than 2.2µF to ground (tantalum recommended). |
| 3 | VIN | power_in | Supply input with an absolute maximum of -0.3V to +24V, with the input capacitor placed close to the pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | QNH |
| Package | SOT-23 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## 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 | VOUT | 4.312 | 4.5 | 4.488 | V | VIN=VOUT+2.0V，IOUT=10mA | 8 |
| Output current | IOUT | 100 | 150 |  | mA | VIN=VOUT+2.0V | 8 |
| Load regulation | ΔVOUT |  | 5 | 60 | mV | VIN=VOUT+2.0V，1mA≤IOUT≤70mA | 8 |
| Dropout voltage | VDIF |  | 25 | 55 | mV | IOUT=1mA，ΔVOUT=2% | 8 |
| Quiescent current | ISS |  | 1.5 | 3 | μA | 无负载 | 8 |
| Line regulation | ΔVOUT/VOUT*ΔVIN |  |  | 0.2 | %/V | VOUT+1.0V≤VIN≤24V，IOUT=1mA | 8 |
| Input voltage | VIN |  |  | 24 | V |  | 8 |
| Absolute maximum input voltage | VIN | -0.3 |  | 24 | V |  | 4 |
| Storage temperature | TSTG | -50 |  | 125 | ℃ |  | 4 |
| Operating temperature | TA | -40 |  | 85 | ℃ |  | 4 |
| Thermal resistance junction-to-ambient SOT23-3 | θJA |  | 500 |  | ℃/W | SOT23-3 | 4 |
| Power dissipation SOT23-3 | PD |  |  | 200 | mW | SOT23-3 | 4 |

## CAD (KiCad official)

- Symbol: `HT44-Q`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ht44-q-etched.step` / `ht44-q-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht44-q.step` / `ht44-q.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [QNH datasheet](docs/ht44-q-datasheet.pdf) (13 pp, sha256 `c8be6bf11c973fad`, retrieved 2026-11-06, 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-sonnet-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/ht44-q-datasheet.pdf)