# NCP18WB333J03RB

**Murata Electronics** · NTC Thermistors · 0603

NCP18WB333J03RB from Murata Electronics, in a 0603. 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 | 1 | passive | Terminal 1 of an unpolarised resistor; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised resistor; either orientation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Murata Electronics |
| Package | 0603 |
| Category | Sensors |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Resistance tolerance (J code) |  | -5 |  | 5 | % | Tolerance code J (p = J: ±5%) per part number table | 12 |
| B-constant (25-50°C) tolerance |  | -3 |  | 3 | % | B-constant 25-50°C | 12 |
| Maximum Operating Current (25°C) |  |  |  | 0.055 | mA | 25°C; max current keeps thermistor self-heating to 0.1°C | 12 |
| Maximum Voltage |  |  |  | 5 | V |  | 12 |
| Operating Temperature Range |  | -40 |  | 125 | °C | Operating temperature range | 12 |
| Storage temperature (recommended) |  | -10 |  | 40 | °C | Recommended storage; use within 6 months of delivery | 19 |
| Storage humidity (recommended) |  |  |  | 75 | %RH | Recommended storage; not dewing condition | 19 |
| Resistance (25°C) | R25 |  | 33 |  | kΩ | 25°C, zero-power resistance | 12 |
| B-constant (25-50°C) | B25/50 |  | 4050 |  | K | 25-50°C | 12 |
| B-constant (25-80°C) reference value | B25/80 |  | 4101 |  | K | 25-80°C; reference value | 12 |
| B-constant (25-85°C) reference value | B25/85 |  | 4108 |  | K | 25-85°C; reference value | 12 |
| B-constant (25-100°C) reference value | B25/100 |  | 4131 |  | K | 25-100°C; reference value | 12 |
| Typical Dissipation Constant (25°C) |  |  | 1 |  | mW/°C | 25°C; power needed to raise thermistor temperature 1°C by self-heating | 12 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | Copper |  | ø0.3mm Copper Lead Wire with Polyurethane Coat | 5 |

## CAD (KiCad official)

- Symbol: `NCP18WB333J03RB`
- Footprint: `Resistor_SMD:R_0603_1608Metric`
- 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files: `ncp18wb333j03rb-etched.step` / `ncp18wb333j03rb-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ncp18wb333j03rb.step` / `ncp18wb333j03rb.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Murata Electronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588876997976068096) (37 pp, sha256 `65ce16b3b8439eb4`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `two-terminal convention` (convention), consensus `off` (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/ncp18wb333j03rb-datasheet.pdf)