# EXB-28V121JX

**PANASONIC** · Resistor Networks & Arrays · 0402x4

EXB-28V121JX from PANASONIC, 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 (120 ohm, ±5%), connected internally to pin 8, rated 0.063 W per element at 70 °C with a 50 V limiting element voltage. |
| 2 | R2_A | passive | One terminal of isolated resistor 2 (120 ohm, ±5%), connected internally to pin 7, rated 0.063 W per element at 70 °C with a 50 V limiting element voltage. |
| 3 | R3_A | passive | One terminal of isolated resistor 3 (120 ohm, ±5%), connected internally to pin 6, rated 0.063 W per element at 70 °C with a 50 V limiting element voltage. |
| 4 | R4_A | passive | One terminal of isolated resistor 4 (120 ohm, ±5%), connected internally to pin 5, rated 0.063 W per element at 70 °C with a 50 V limiting element voltage. |
| 5 | R4_B | passive | Other terminal of isolated resistor 4, connected internally to pin 4, rated 0.063 W per element at 70 °C with a 100 V maximum overload voltage. |
| 6 | R3_B | passive | Other terminal of isolated resistor 3, connected internally to pin 3, rated 0.063 W per element at 70 °C with a 100 V maximum overload voltage. |
| 7 | R2_B | passive | Other terminal of isolated resistor 2, connected internally to pin 2, rated 0.063 W per element at 70 °C with a 100 V maximum overload voltage. |
| 8 | R1_B | passive | Other terminal of isolated resistor 1, connected internally to pin 1, rated 0.063 W per element at 70 °C with a 100 V maximum overload voltage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | PANASONIC |
| 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 |
|---|---|---|---|---|---|---|---|
| Tolerance |  | -5 |  | 5 | % | catalog description (LCSC C2654098) | catalog |
| Resistance |  |  | 120 |  | Ω | nominal, catalog description (LCSC C2654098) | catalog |
| Temperature coefficient | TCR | -200 |  | 200 | ppm/°C | catalog description (LCSC C2654098) | catalog |

## CAD (KiCad official)

- Symbol: `EXB-28V121JX`
- Footprint: `Resistor_SMD:R_Array_Convex_4x0402`
- 3D model: 0402x4 (KiCad packages3D, STEP)
- 3D model files: `exb-28v121jx-etched.step` / `exb-28v121jx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `exb-28v121jx.step` / `exb-28v121jx.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PANASONIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590152150711107584) (8 pp, sha256 `f675a311db7d66ab`, retrieved 2026-10-26, 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/exb-28v121jx-datasheet.pdf)