# HT1403ARZ

**HTCSEMI** · Voltage References · SO-8

HT1403ARZ from HTCSEMI, in a SO-8. 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 | Vin | power_in | Input supply voltage pin, operating range 4.5 V to 40 V (absolute maximum 40 V). |
| 2 | Vout | output | 2.5 V reference output (±25 mV) sourcing up to 10 mA; output capacitance should not exceed 1.0 µF for stability. |
| 3 | Gnd | power_in | Ground pin. |
| 4 | NC | unconnected | No connection. |
| 5 | NC | unconnected | No connection. |
| 6 | NC | unconnected | No connection. |
| 7 | NC | unconnected | No connection. |
| 8 | NC | unconnected | No connection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HTCSEMI |
| Package | SO-8 |
| Category | Power Supply Chip |
| Pins | 8 |

## 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 | 2.475 | 2.5 | 2.525 | V | IO = 0 mA, Vin = 15 V, TA = 25C | 2 |
| Temperature Coefficient of Output Voltage | ΔVO/ΔT |  | 10 | 40 | ppm/C | HT1403; Vin = 15 V, TA = 25C | 2 |
| Output Voltage Change over temperature (0 to +70C) | ΔVO |  |  | 7 | mV | HT1403 0 to +70C | 2 |
| Line Regulation (15 V ≤ VI ≤ 40 V) | Regline |  | 1.2 | 4.5 | mV | IO = 0 mA, 15 V ≤ VI ≤ 40 V | 2 |
| Line Regulation (4.5 V ≤ VI ≤ 15 V) | Regline |  | 0.6 | 3 | mV | IO = 0 mA, 4.5 V ≤ VI ≤ 15 V | 2 |
| Load Regulation | Regload |  |  | 10 | mV | 0 mA < IO < 10 mA | 2 |
| Quiescent Current | IQ |  | 1.2 | 1.5 | mA | IO = 0 mA | 2 |
| Input Voltage | VI |  |  | 40 | V | TA = 25C | 1 |
| Storage Temperature | Tstg | -65 |  | 150 | C |  | 1 |
| Junction Temperature | TJ |  |  | 175 | C |  | 1 |
| Operating Ambient Temperature Range | TA | 0 |  | 70 | C | HT1403A | 1 |
| Input Voltage Range | Vin | 4.5 |  | 40 | V |  | 1 |
| Output Current | IO |  |  | 10 | mA |  | 1 |

## CAD (KiCad official)

- Symbol: `HT1403ARZ`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `ht1403arz-etched.step` / `ht1403arz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht1403arz.step` / `ht1403arz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HTCSEMI datasheet](docs/ht1403arz-datasheet.pdf) (5 pp, sha256 `3fdf728c7346d5e3`, retrieved 2026-10-23, tier: lcsc)
- **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/ht1403arz-datasheet.pdf)