DX1248

Dersem · LED Drivers · ESOP-8

DX1248 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	DIM	input	PWM dimming input with an internal 100uA pull-up that defaults high when floating; output turns off when low and the chip enters sleep after low for more than 120 ms, with an absolute maximum of -0.3 to 6.0 V.
2	NC	unconnected	No internal connection; the datasheet specifies this pin as floating (suspended).
3	CS1	input	Output current sense input 1, where the output current is set by the sense resistor as IOUT = 0.137 / Rcs with VCS regulated at 132-142 mV (137 mV typical) and an absolute maximum of -0.3 to 6 V.
4	CS2	input	Output current sense input 2, used with the same sense-voltage regulation of 132-142 mV (137 mV typical) and absolute maximum of -0.3 to 6 V as CS1.
5	VDDO	power_out	5 V supply pin intended to power an external PWM control chip, with the absolute maximum VDD rating of -0.3 to 6 V; the text limits this VDDO function to DX1240 and DX12410.
6	DRAIN	output	LED drive pin connected to the internal NMOS drain that sinks the LED current, with the DX1248 absolute drain-voltage limit not printed in the rating table (the ordering table lists 80 V for DX1248).
7	VIN	power_in	Supply input with a 2.5-40 V operating range per the features list and an absolute maximum of -0.3 to 46 V; a clamp diode to GND is recommended above 36 V.
8	GND	power_in	Chip ground reference for the device.
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

CAD (KiCad official)

Symbol: DX1248
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
3D model: ESOP-8 (KiCad packages3D, STEP)
3D model files: dx1248-etched.step / dx1248-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); dx1248.step / dx1248.glb are the bare package body.

Provenance

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

Datasheet: Dersem datasheet (9 pp, sha256 dcd1102efc9dac6e, retrieved 2026-10-09, 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

# DX1248

**Dersem** · LED Drivers · ESOP-8

DX1248 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 | DIM | input | PWM dimming input with an internal 100uA pull-up that defaults high when floating; output turns off when low and the chip enters sleep after low for more than 120 ms, with an absolute maximum of -0.3 to 6.0 V. |
| 2 | NC | unconnected | No internal connection; the datasheet specifies this pin as floating (suspended). |
| 3 | CS1 | input | Output current sense input 1, where the output current is set by the sense resistor as IOUT = 0.137 / Rcs with VCS regulated at 132-142 mV (137 mV typical) and an absolute maximum of -0.3 to 6 V. |
| 4 | CS2 | input | Output current sense input 2, used with the same sense-voltage regulation of 132-142 mV (137 mV typical) and absolute maximum of -0.3 to 6 V as CS1. |
| 5 | VDDO | power_out | 5 V supply pin intended to power an external PWM control chip, with the absolute maximum VDD rating of -0.3 to 6 V; the text limits this VDDO function to DX1240 and DX12410. |
| 6 | DRAIN | output | LED drive pin connected to the internal NMOS drain that sinks the LED current, with the DX1248 absolute drain-voltage limit not printed in the rating table (the ordering table lists 80 V for DX1248). |
| 7 | VIN | power_in | Supply input with a 2.5-40 V operating range per the features list and an absolute maximum of -0.3 to 46 V; a clamp diode to GND is recommended above 36 V. |
| 8 | GND | power_in | Chip ground reference for the device. |
| 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 |

## CAD (KiCad official)

- Symbol: `DX1248`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `dx1248-etched.step` / `dx1248-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dx1248.step` / `dx1248.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/8603378641749491712) (9 pp, sha256 `dcd1102efc9dac6e`, retrieved 2026-10-09, 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/dx1248-datasheet.pdf)