# HT18B20ATZ

**HTCSEMI** · Temperature Sensors · TO-92

HT18B20ATZ from HTCSEMI, in a TO-92. 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 | Common pin; all voltages are referenced to this pin. |
| 2 | DQ | bidirectional | 1-Wire data input/output; it must be pulled up to UPU through an external resistor (4.7 kΩ in Figures 12 and 13), and UIL max is 0.8 V at UDD = 5 V. |
| 3 | VDD | power_in | Power supply pin with UDD range 3.0 V to 5.5 V; UDD is 0 V when the device is powered from the DQ pin in parasite mode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HTCSEMI |
| Package | TO-92 |
| Category | Sensors |
| 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 |
|---|---|---|---|---|---|---|---|
| Ambient temperature | Ta | -60 |  | 125 | °C |  | 4 |
| Supply voltage (on external pull-up resistor) | UPU | 3 |  |  | V | in supply mode on VDD pin | 4 |
| High level input voltage | UIH | 3 |  |  | V | in supply mode on DQ pin (UDD = 0 V) | 4 |
| Cycle time of EEPROM record | tWR |  |  | 10 | ms | at UDD = 5 V | 4 |
| Operating ambient temperature | Ta | -55 |  | 125 | °C |  | 4 |
| Consumption current | IDD |  |  | 1 | µA | at 0 V ≤ UI ≤ 0.4 V or UDD−0.3 V ≤ UI ≤ UDD; ambient -55 to 70 °C | 5 |
| Dynamic consumption current | IODD |  |  | 1500 | µA | at UDD = 5 V; ambient -55 to 125 °C | 5 |
| Low level output current | IOL | 4 |  |  | mA | at UO = 0.4 V | 5 |
| Temperature measurement error | tERR | -2 |  | 2 | °C | ambient -55 to 125 °C | 5 |
| Temperature conversion time, 11-bit resolution | tCONV |  |  | 375 | ms | 11-bit resolution | 10 |
| Temperature conversion time, 12-bit resolution | tCONV |  |  | 750 | ms | 12-bit resolution | 10 |
| Time interval of 1-Wire communication protocol (time slot) | tSLOT | 60 |  | 120 | µs |  | 10 |
| Write 1 low level duration | tLOW1 | 1 |  | 15 | µs |  | 10 |
| Write 0 low level duration | tLOW0 | 60 |  | 120 | µs |  | 10 |
| Read data valid | tRDV |  |  | 15 | µs |  | 10 |
| Recovery time | tREC | 1 |  |  | µs |  | 10 |
| Reset high level duration | tRSTH | 480 |  |  | µs |  | 10 |
| Reset low level duration | tRSTL | 480 |  |  | µs |  | 10 |
| Presence pulse high level duration | tPDH | 15 |  | 60 | µs |  | 10 |
| Presence pulse low level duration | tPDL | 60 |  | 240 | µs |  | 10 |

## CAD (KiCad official)

- Symbol: `HT18B20ATZ`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `ht18b20atz-etched.step` / `ht18b20atz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht18b20atz.step` / `ht18b20atz.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/8603034662675894272) (16 pp, sha256 `e9d026fd610dd6a5`, retrieved 2026-10-18, 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/ht18b20atz-datasheet.pdf)