# DX3112E

**Dersem** · LED Drivers · ESOP-8

DX3112E from Dersem, in a ESOP-8. 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 | NC | unconnected | Not connected; the datasheet specifies this pin as a floating (suspended) pin. |
| 2 | NC | unconnected | Not connected; the datasheet specifies this pin as a floating (suspended) pin. |
| 3 | REXT1 | input | Current-sampling port 1 for setting the channel 1 output current through an external REXT resistor; the datasheet limits its input voltage to -0.3 V to 7 V. |
| 4 | REXT2 | input | Current-sampling port 2 for setting the channel 2 output current through an external REXT resistor; the datasheet limits its input voltage to -0.3 V to 7 V. |
| 5 | OUT1 | output | Constant-current output port 1 driving LED string 1; the datasheet limits its voltage to -0.3 V to 500 V. |
| 6 | OUT2 | output | Constant-current output port 2 driving LED string 2; the datasheet limits its voltage to -0.3 V to 500 V. |
| 7 | NC | unconnected | Not connected; the datasheet specifies this pin as a floating (suspended) pin. |
| 8 | VIN | power_in | Chip supply input that powers the device from the high-voltage line; the datasheet limits its voltage to -0.3 V to 700 V and lists a minimum operating voltage of 18.5 V. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Dersem |
| Package | ESOP-8 |
| Category | LED Drivers |
| 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 |
|---|---|---|---|---|---|---|---|
| Operating voltage | VIN | 18.5 |  |  | V |  | 3 |
| Quiescent operating current | IDD |  |  | 140 | uA |  | 3 |
| Drive-side peak voltage (OUT1) | VOUT1 | 500 |  |  | V |  | 3 |
| Drive-side peak voltage (OUT2) | VOUT2 | 500 |  |  | V |  | 3 |
| Operating current (REXT1 channel) | IREXT1 | 0 |  | 40 | mA |  | 3 |
| Operating current (REXT2 channel) | IREXT2 | 0 |  | 40 | mA |  | 3 |
| Current-sampling input voltage (REXT1, REXT2) | REXT1、REXT2 | -0.3 |  | 7 | V |  | 2 |
| VIN pin voltage | VMAX1 | 0.3 |  | 700 | V |  | 2 |
| OUT1, OUT2 pin voltage | VMAX2 | 0.3 |  | 500 | V |  | 2 |
| Operating junction temperature range | TJ | -40 |  | 150 | °C |  | 2 |
| Operating temperature | Tc | -40 |  | 100 | °C |  | 2 |
| Storage temperature range | TSTG | -55 |  | 150 | °C |  | 2 |
| Maximum chip power dissipation | PDMAX |  |  | 1.25 | W |  | 2 |
| Auxiliary discharge current | IPULL |  | 2.5 |  | mA | 25℃ | 3 |
| Constant-current voltage reference | VREF1 |  | 0.6 |  | V | 25℃ | 3 |
| Current negative temperature compensation start point | TSC |  | 150 |  | ℃ |  | 3 |
| Package thermal resistance, junction to ambient | RTHJA |  | 60 |  | ℃/W |  | 3 |

## CAD (KiCad official)

- Symbol: `DX3112E`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `dx3112e-etched.step` / `dx3112e-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dx3112e.step` / `dx3112e.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Dersem datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603369280277278720) (7 pp, sha256 `237977eb6677001a`, retrieved 2026-10-17, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/dx3112e-datasheet.pdf)