# MFR0W4F4702A50

**UNI ROYAL Uniroyal Elec** · Through Hole Resistors · R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal

MFR0W4F4702A50 from UNI ROYAL Uniroyal Elec, in a R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal. 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 | UNI ROYAL Uniroyal Elec |
| Package | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal |
| Category | Resistors |
| 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 (part no. code F = ±1%) |  | -1 |  | 1 | % | Part no. 7th code F = ±1% | 8 |
| Temperature coefficient of resistance (±1% item) | TCR | -50 |  | 50 | PPM/℃ | Room temp. (T1) and room temp. +100℃ (T2), JIS-C-5201 4.8 | 7 |
| Max working voltage (RCWV), MF 1/4W |  |  |  | 250 | V | MF 1/4W normal size row | 4 |
| Max overload voltage, MF 1/4W |  |  |  | 500 | V | MF 1/4W normal size row; overload = 2.5 × RCWV | 4 |
| Dielectric withstanding voltage, MF 1/4W |  |  |  | 500 | V | MF 1/4W normal size row; AC test for 60-70 s, 90° V-block (4.7) | 4 |
| Short-time overload resistance change | ΔR/R | -0.5 |  | 0.5 | % | 2.5 × RCWV for 5 s; printed ±(0.5%+0.05Ω) max; no mechanical damage | 7 |
| Pulse overload resistance change | ΔR/R | -1 |  | 1 | % | 10,000 cycles, 1 s ON / 25 s OFF at 4 × RCWV; printed ±(1%+0.05Ω) max | 7 |
| Resistance to soldering heat resistance change | ΔR/R | -1 |  | 1 | % | Leads immersed 2.0-2.5mm from body in 260℃±5℃ solder for 10±1 s; printed ±(1%+0.05Ω) max | 7 |
| Solderability (coverage) |  | 95 |  |  | % | Solder at 245℃±3℃, dwell 2-3 s; coverage minimum | 7 |
| Temperature cycling resistance change | ΔR/R | -1 |  | 1 | % | 5 cycles, -55℃±3℃ 30 min / +155℃±2℃ 30 min; printed ±(1%+0.05Ω) max | 7 |
| Load life in humidity resistance change (normal type) | ΔR/R | -1.5 |  | 1.5 | % | 1,000 h, 1.5 h ON / 0.5 h OFF at RCWV, 40℃±2℃, 90-95% RH | 7 |
| Load life resistance change (normal type) | ΔR/R | -1.5 |  | 1.5 | % | 1,000 h at RCWV, duty 1.5 h ON / 0.5 h OFF, 70℃±2℃ ambient | 7 |
| Ambient temperature range for rated continuous load |  | -55 |  | 70 | ℃ | Continuous load at full power rating; above 70℃ derate per Figure 1 (curve not reproduced in text) | 6 |
| Recommended storage temperature |  | 15 |  | 35 | ℃ | UNIOHM recommended storage condition | 13 |
| Recommended storage humidity |  | 25 |  | 75 | % | UNIOHM recommended storage condition | 13 |

## 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 | tin | 4 Lead wire Tin solder coated copper wire | 5 |

## CAD (KiCad official)

- Symbol: `MFR0W4F4702A50`
- Footprint: `Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal`
- 3D model: R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [UNI ROYAL Uniroyal Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588887070903713792) (13 pp, sha256 `a4c17c09acd8577c`, retrieved 2026-11-06, 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/mfr0w4f4702a50-datasheet.pdf)