# DS18B20U

**Mysentech** · Temperature Sensors · MSOP-8

DS18B20U from Mysentech, in a MSOP-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 | DQ | bidirectional | Single-wire digital data input/output of the 1-Wire interface, an open-drain/tri-state port that needs an external pull-up of about 4.7 kΩ (1 kΩ to 10 kΩ per the DC table) and a bus held low longer than 480 µs resets all devices. |
| 2 | N.C. | unconnected | Not connected (no internal connection for this package variant). |
| 3 | N.C. | unconnected | Not connected (no internal connection for this package variant). |
| 4 | GND | power_in | Ground reference for all voltages on the device. |
| 5 | N.C. | unconnected | Not connected (no internal connection for this package variant). |
| 6 | N.C. | unconnected | Not connected (no internal connection for this package variant). |
| 7 | N.C. | unconnected | Not connected (no internal connection for this package variant). |
| 8 | VDD | power_in | Supply pin for external power, with a supply range of 1.8 V to 5.5 V; the datasheet also allows parasitic (DQ-powered) operation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Mysentech |
| Package | MSOP-8 |
| Category | Sensors |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply voltage | VDD | 1.8 |  | 5.5 | V | 电源供电电压 | 21 |
| Temperature error (0°C to +60°C, 18B20U max accuracy) | tERR | -0.5 |  | 0.5 | °C | 0°C~+60°C (note 6, 18B20U) | 21 |
| Temperature error (full range) | tERR | -1.5 |  | 1.5 | °C | -55°C 到+125°C | 21 |
| Pull-down current | IL | 4 |  |  | mA | VI/O=0.4V | 21 |
| Idle state current | IDDS |  | 0.2 | 1 | µA |  | 21 |
| Pull-up resistor | Rup | 1 | 4.7 | 10 | KΩ |  | 21 |
| Pull-up voltage | Vup | 1.8 |  | 5 | V |  | 21 |
| E2PROM write endurance | NEEWR | 50000 |  |  | 次 | -55°C 到+55°C | 22 |
| Non-volatile memory write cycle time | tWR |  |  | 40 | ms |  | 22 |
| Time slot length | tSLOT | 60 |  | 120 | µs | 见备注 | 22 |
| Recovery time | tREC | 1 | 5 |  | µs | 见备注 | 22 |
| Write 0 low time | tLOW0 | 60 | 60 | 120 | µs | 见备注 | 22 |
| Write 1 low time | tLOW1 | 1 | 5 | 15 | µs | 见备注 | 22 |
| Read data valid time | tRDV |  | 5 | 15 | µs | 见备注 | 22 |
| Reset low time | tRSTL | 480 | 960 |  | µs | 见备注 | 22 |
| Presence detect high time | tPDHIGH | 15 | 30 | 60 | µs | 见备注 | 22 |
| Presence detect low time | tPDLOW | 60 | 115 | 240 | µs | 见备注 | 22 |
| Temperature conversion time | tCONV | 15 | 100 | 500 | ms | 见备注 | 22 |
| Voltage on any pin to GND |  | -0.5 |  | 6 | V |  | 21 |
| Operating temperature range |  | -55 |  | 125 | °C |  | 21 |
| Storage temperature range |  | -55 |  | 125 | °C |  | 21 |

## CAD (KiCad official)

- Symbol: `DS18B20U`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `ds18b20u-etched.step` / `ds18b20u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ds18b20u.step` / `ds18b20u.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Mysentech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757703799320657920) (27 pp, sha256 `190d56a780e2d38b`, retrieved 2026-10-17, 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/ds18b20u-datasheet.pdf)