# ME8109BD8G

**MICRONE** · AC-DC Controllers & Regulators · DIP-8

ME8109BD8G from MICRONE, in a DIP-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 | No connection; the datasheet gives no function for this pin. |
| 2 | RT | bidirectional | Dual-function pin connected through an NTC resistor to ground for over-temperature shutdown/latch control (100 µA source, OTP threshold 1 V), or through a Zener to VDD for adjustable over-voltage protection. |
| 3 | GND | power_in | Ground. |
| 4 | FB | input | Voltage feedback pin, connected to a photo-coupler to control the duty cycle (abs max -0.3 to 7 V). |
| 5 | VDD | power_in | Chip DC power supply pin, recommended 10 to 30 V, UVLO on 9 V and off 14 V typical, abs max 40 V. |
| 6 | SENSE | input | Current sense input connected to the MOSFET current sensing resistor node (abs max -0.3 to 7 V). |
| 7 | DRAIN | passive | Drain of the internal high-voltage MOSFET, rated 600 V for ME8109B (pins 7 and 8 are common). |
| 8 | DRAIN | passive | Drain of the internal high-voltage MOSFET, rated 600 V for ME8109B (pins 7 and 8 are common). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MICRONE |
| Package | DIP-8 |
| Category | Power Supply Chip |
| Pins | 8 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VDD/VIN DC Supply Voltage | VDD |  |  | 40 | V |  | 4 |
| Drain Voltage ME8109B |  | -0.3 |  | 600 | V | ME8109B | 4 |
| VDD DC Clamp Continuous Current |  |  |  | 10 | mA |  | 4 |
| Voltage at FB, SENSE, RT | VFB, VSENSE, VRT | -0.3 |  | 7 | V | to GND | 4 |
| Operating Junction Temperature | TJ | -20 |  | 85 | °C |  | 4 |
| Storage Temperature | Tstg | -55 |  | 150 | °C |  | 4 |
| VDD Supply Voltage | VDD | 10 |  | 30 | V |  | 5 |
| Operating Ambient Temperature | TA | -20 |  | 85 | °C |  | 5 |
| VDD Start up Current | IStartup |  | 2 | 20 | μA | VDD=11V, Measure leakage current into VDD | 5 |
| Operation Current | IVDD_Operation |  | 1.8 | 3 | mA | VFB=3V | 5 |
| VDD Under Voltage Lockout Enter | UVLOON | 8 | 9 | 10 | V |  | 5 |
| VDD Under Voltage Lockout Exit (Recovery) | UVLOOFF | 13 | 14 | 15.5 | V |  | 5 |
| VDD Clamp | VDD_Clamp | 30 | 32 | 34 | V | IVDD = 10 mA | 5 |
| VDD Over voltage protection enter | OVPON | 24 | 26 | 28 | V | CS=0V,FB=3V Ramp up VDD until gate clock is off | 5 |
| Max duty cycle | Maximum duty cycle | 75 | 80 | 85 | % | VDD=16V,VFB=3V, VCS=0V | 5 |
| VFB Open Loop Voltage | VFB_Open | 3.9 | 4.2 |  | V |  | 5 |
| Power limiting Debounce Time | TD_PL | 80 | 88 | 96 | mS |  | 5 |
| Normal Oscillation Frequency | FOSC | 60 | 65 | 70 | KHz | VDD=16V,FB=3V,CS=0V | 6 |
| Drain-Source Voltage ME8109B | BVdss | 600 |  |  | V | Vgs=0, ME8109B | 6 |
| Static Drain-Source On-Resistance ME8109B | Ron |  |  | 4.4 | Ω | VGS=10V, Id=1.0A, ME8109B | 6 |
| MOSFET Maximum duty cycle | Duty | 75 | 80 | 85 | % |  | 6 |
| Output current of RT pin | IRT | 95 | 100 | 105 | μA |  | 6 |
| Threshold voltage for OTP | VOTP | 0.95 | 1 | 1.05 | V |  | 6 |
| Continuous drain current | ID |  |  | 2 | A |  | 6 |
| VDD Pull-up PMOS active | VPULL-UP |  | 13 |  | V |  | 5 |
| PWM Input Gain | AVCS |  | 2 |  | V/V | ΔVFB /ΔVCS | 5 |
| Internal current limiting threshold voltage | VTH_OC |  | 0.875 |  | V | FB=3.3V | 6 |
| Leading edge blanking time | T_blanking |  | 220 |  | nS |  | 5 |

## 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 |
|---|---|---|---|---|
| housing | ppa |  | body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing Micro | 11 |

## CAD (KiCad official)

- Symbol: `ME8109BD8G`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files: `me8109bd8g-etched.step` / `me8109bd8g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `me8109bd8g.step` / `me8109bd8g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MICRONE datasheet](docs/me8109bd8g-datasheet.pdf) (11 pp, sha256 `c44aa3d071f80a62`, retrieved 2026-10-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/me8109bd8g-datasheet.pdf)