# CAT10-203J4LF

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

CAT10-203J4LF from BOURNS, 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 isolated resistor 1, whose other terminal is pin 8; 4 isolated resistors, 0.0625 W per resistor at 70 °C. |
| 2 | R2_A | passive | One terminal of isolated resistor 2, whose other terminal is pin 7; 0.0625 W per resistor at 70 °C. |
| 3 | R3_A | passive | One terminal of isolated resistor 3, whose other terminal is pin 6; 0.0625 W per resistor at 70 °C. |
| 4 | R4_A | passive | One terminal of isolated resistor 4, whose other terminal is pin 5; 0.0625 W per resistor at 70 °C. |
| 5 | R4_B | passive | Other terminal of isolated resistor 4, whose first terminal is pin 4; max working voltage 25 V. |
| 6 | R3_B | passive | Other terminal of isolated resistor 3, whose first terminal is pin 3; max working voltage 25 V. |
| 7 | R2_B | passive | Other terminal of isolated resistor 2, whose first terminal is pin 2; max working voltage 25 V. |
| 8 | R1_B | passive | Other terminal of isolated resistor 1, whose first terminal is pin 1; max working voltage 25 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BOURNS |
| 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 |  |  | 20 |  | kΩ | nominal, catalog attribute (LCSC C148502) | catalog |
| Tolerance |  | -5 |  | 5 | % | catalog attribute (LCSC C148502) | catalog |
| Rated power |  |  |  | 62.5 | mW | catalog attribute (LCSC C148502) | catalog |
| Temperature coefficient | TCR | -250 |  | 250 | ppm/°C | catalog description (LCSC C148502) | catalog |

## CAD (KiCad official)

- Symbol: `CAT10-203J4LF`
- Footprint: `Resistor_SMD:R_Array_Convex_4x0402`
- 3D model: 0402x4 (KiCad packages3D, STEP)
- 3D model files: `cat10-203j4lf-etched.step` / `cat10-203j4lf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cat10-203j4lf.step` / `cat10-203j4lf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BOURNS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588900308349571072) (2 pp, sha256 `d58ea7e6f915b8fc`, 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/cat10-203j4lf-datasheet.pdf)