# DIO8280AXS8

**DIOO** · LED Drivers · SOP-8-EP

DIO8280AXS8 from DIOO, in a SOP-8-EP. 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 | SENN | input | Negative current sense pin; the current sense limit across SEN-SENN is 200mV typical and the pin is rated -0.3 to 90V. |
| 2 | EN | input | Enable and PWM dimming input pin, with turn-on threshold 1.28V, turn-off threshold 0.56V, and rated -0.3 to 90V. |
| 3 | CF | input | Connect a capacitor to ground to filter AC ripple on the reference voltage, or apply 0~1.2V directly for linear dimming. |
| 4 | GND | power_in | Ground pin. |
| 5 | LX | passive | Power MOSFET drain pin connected to the inductor node, rated -0.3 to 90V. |
| 6 | LX | passive | Power MOSFET drain pin connected to the inductor node, rated -0.3 to 90V. |
| 7 | VIN | power_in | Input supply pin, 16 to 85V recommended, to be decoupled to GND with a ceramic capacitor. |
| 8 | SEN | input | Positive current sense pin, rated -0.3 to 90V; PWM is disabled if VSEN-VSENN is 0.3V or more. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | DIOO |
| Package | SOP-8-EP |
| Category | Nixie Tube Driver/LED Driver |
| Pins | 9 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Voltage Range | VIN | 16 |  | 85 | V | VIN = 24V, VOUT = 12V, IOUT = 100mA, TA = 25°C | 4 |
| Shutdown Current | IDN |  |  | 10 | μA | EN=0 | 4 |
| Current Sense Limit | VSEN-SENN | 196 | 200 | 204 | mV |  | 4 |
| Power MOSFET ON Resistance | RDSON |  | 200 |  | mΩ |  | 4 |
| Power MOSFET Current Limit | ILIMIT |  | 2.8 |  | A |  | 4 |
| Switching Frequency | FSW |  | 400 |  | kHz |  | 4 |
| EN turn-on Threshold | VENH |  | 1.28 |  | V |  | 4 |
| EN turn-off Threshold | VENL |  | 0.56 |  | V |  | 4 |
| VIN turn-on threshold | VIN,ON |  | 7.4 |  | V |  | 4 |
| VIN turn-off threshold | VVIN,OFF |  | 6.8 |  | V |  | 4 |
| Analog dimming range on CF | VCF |  | 120 |  | mV | ILED=10% | 4 |
| Analog dimming range on CF | VCF |  | 1.2 |  | V | ILED=100% | 4 |
| Thermal Shutdown Temperature | TSD |  | 150 |  | °C |  | 4 |
| Thermal Hysteresis | Hyst |  | 30 |  | °C |  | 4 |
| Abs max LX, VIN, EN, SEN, SENN |  | -0.3 |  | 90 | V |  | 3 |
| Abs max all other pins |  | -0.3 |  | 5.5 | V |  | 3 |
| Power Dissipation | PD |  |  | 3.3 | W | TA=25°C | 3 |
| Junction Temperature Range (abs max) |  | -40 |  | 150 | °C |  | 3 |
| Lead Temperature |  |  |  | 260 | °C |  | 3 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 3 |
| Recommended VIN, LX, EN, SEN, SENN |  | 16 |  | 85 | V |  | 3 |
| Recommended all other pins |  | 0 |  | 5 | V |  | 3 |
| Recommended Junction Temperature Range |  | -40 |  | 125 | °C |  | 3 |
| Thermal Resistance Junction-to-Ambient | ΘJA |  | 30 |  | °C/W |  | 3 |
| Thermal Resistance Junction-to-Case | ΘJC |  | 10 |  | °C/W |  | 3 |

## 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 |  | problems, we should place the following components close to the IC: CVIN, L, COUT, CF and RCS. 1) It is desirable to maximize the PCB copper area connecting to GND pin to achieve the best thermal and | 7 |

## CAD (KiCad official)

- Symbol: `DIO8280AXS8`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`
- 3D model: SOP-8-EP (KiCad packages3D, STEP)
- 3D model files: `dio8280axs8-etched.step` / `dio8280axs8-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dio8280axs8.step` / `dio8280axs8.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [DIOO datasheet](docs/dio8280axs8-datasheet.pdf) (9 pp, sha256 `d266813ec5191a25`, retrieved 2026-10-23, 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/dio8280axs8-datasheet.pdf)