# YC124-FR-07121RL

**YAGEO** · Resistor Networks, Arrays · 0402x4

YC124-FR-07121RL from YAGEO, in a 0402x4. 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 | R1_A | passive | One terminal of resistor R1, which is paired with pin 8 (R1 = R2 = R3 = R4). |
| 2 | R2_A | passive | One terminal of resistor R2, which is paired with pin 7 (R1 = R2 = R3 = R4). |
| 3 | R3_A | passive | One terminal of resistor R3, which is paired with pin 6 (R1 = R2 = R3 = R4). |
| 4 | R4_A | passive | One terminal of resistor R4, which is paired with pin 5 (R1 = R2 = R3 = R4). |
| 5 | R4_B | passive | Other terminal of resistor R4, which is paired with pin 4. |
| 6 | R3_B | passive | Other terminal of resistor R3, which is paired with pin 3. |
| 7 | R2_B | passive | Other terminal of resistor R2, which is paired with pin 2. |
| 8 | R1_B | passive | Other terminal of resistor R1, which is paired with pin 1. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | YAGEO |
| Package | 0402x4 |
| Category | Resistors |
| Pins | 8 |

## Electrical characteristics

Limits from the LCSC catalog entry for this part (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Resistance |  |  | 121 |  | Ω | nominal, catalog attribute (LCSC C728706) | catalog |
| Tolerance |  | -1 |  | 1 | % | catalog attribute (LCSC C728706) | catalog |
| Rated power |  |  |  | 62.5 | mW | catalog attribute (LCSC C728706) | catalog |
| Temperature coefficient | TCR | -200 |  | 200 | ppm/°C | catalog description (LCSC C728706) | catalog |

## CAD (KiCad official)

- Symbol: `YC124-FR-07121RL`
- Footprint: `Resistor_SMD:R_Array_Convex_4x0402`
- 3D model: 0402x4 (KiCad packages3D, STEP)
- 3D model files: `yc124-fr-07121rl-etched.step` / `yc124-fr-07121rl-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `yc124-fr-07121rl.step` / `yc124-fr-07121rl.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YAGEO datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8755458959149289472) (12 pp, sha256 `5bdf9b18c106780d`, retrieved 2026-10-16, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/yc124-fr-07121rl-datasheet.pdf)