EG1242

EG Micro · AC-DC Controllers And Regulators · SOP-8

EG1242 from EG Micro, in a SOP-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	FB	input	Feedback pin: the PWM duty cycle is set by the voltage on this pin together with the current-sense signal; datasheet gives FB open-circuit voltage 5.3 V, short-circuit current 1.2 mA (FB to GND), and overload threshold Vth_OLP 4.6 V.
2	nc	unconnected	No connection; the pin is left floating (marked 悬空 'floating' in the pin table).
3	CS	input	Current-sense pin: the voltage across the external sense resistor is monitored for cycle-by-cycle over-current protection, with a current-limit threshold Vcs(max) of 0.9 V min, 1 V typical, 1.1 V max.
4	RI	passive	Frequency-set pin: a resistor from RI to GND sets the switching frequency per Fosc(KHz)=1485/RI(KΩ), with RI open-circuit voltage 2 V and the test condition RI=27 kΩ; the chip also applies frequency dithering of ±4%.
5	GND	power_in	Chip ground reference for the controller.
6	OUT	output	Gate-drive output that drives the power MOSFET gate; datasheet limits are VOL 0.3 V max at 20 mA sink, VOH 13 V at 20 mA source, and OUT maximum rating VCC+0.3 V.
7	VCC	power_in	Supply pin: absolute maximum VCC is 30 V, UVLO turn-on 15-17 V and turn-off 9.5-11.5 V, overvoltage protection 27.2-29.2 V, and VCC clamp 31-33 V at 10 mA (clamp current max 10 mA).
8	RT	input	Over-temperature protection pin: an external NTC thermistor to GND sets the trip point, with an internal 80 µA source current; the protection trips when RT falls to 1 V and releases when RT rises above 1.1 V.

Key specifications

Parameter	Value
Manufacturer	EG Micro
Package	SOP-8
Category	Power Management (PMIC)
Pins	8

CAD (KiCad official)

Symbol: EG1242
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)
3D model files: eg1242-etched.step / eg1242-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); eg1242.step / eg1242.glb are the bare package body.

Provenance

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

Datasheet: EG Micro datasheet (11 pp, sha256 b925eee78bcb0743, 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

# EG1242

**EG Micro** · AC-DC Controllers And Regulators · SOP-8

EG1242 from EG Micro, in a SOP-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 | FB | input | Feedback pin: the PWM duty cycle is set by the voltage on this pin together with the current-sense signal; datasheet gives FB open-circuit voltage 5.3 V, short-circuit current 1.2 mA (FB to GND), and overload threshold Vth_OLP 4.6 V. |
| 2 | nc | unconnected | No connection; the pin is left floating (marked 悬空 'floating' in the pin table). |
| 3 | CS | input | Current-sense pin: the voltage across the external sense resistor is monitored for cycle-by-cycle over-current protection, with a current-limit threshold Vcs(max) of 0.9 V min, 1 V typical, 1.1 V max. |
| 4 | RI | passive | Frequency-set pin: a resistor from RI to GND sets the switching frequency per Fosc(KHz)=1485/RI(KΩ), with RI open-circuit voltage 2 V and the test condition RI=27 kΩ; the chip also applies frequency dithering of ±4%. |
| 5 | GND | power_in | Chip ground reference for the controller. |
| 6 | OUT | output | Gate-drive output that drives the power MOSFET gate; datasheet limits are VOL 0.3 V max at 20 mA sink, VOH 13 V at 20 mA source, and OUT maximum rating VCC+0.3 V. |
| 7 | VCC | power_in | Supply pin: absolute maximum VCC is 30 V, UVLO turn-on 15-17 V and turn-off 9.5-11.5 V, overvoltage protection 27.2-29.2 V, and VCC clamp 31-33 V at 10 mA (clamp current max 10 mA). |
| 8 | RT | input | Over-temperature protection pin: an external NTC thermistor to GND sets the trip point, with an internal 80 µA source current; the protection trips when RT falls to 1 V and releases when RT rises above 1.1 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | EG Micro |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `EG1242`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `eg1242-etched.step` / `eg1242-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `eg1242.step` / `eg1242.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [EG Micro datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603103727058231296) (11 pp, sha256 `b925eee78bcb0743`, 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/eg1242-datasheet.pdf)