# MC34063N

**HGSEMI** · DC-DC Converters · DIP-8

MC34063N from HGSEMI, 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 | Switch Collector | passive | Collector of the internal output switch (Q1/Q2 Darlington), rated 40V maximum for switch collector voltage and 1.5A maximum switch current. |
| 2 | Switch Emitter | passive | Emitter of the internal output switch, rated 40V maximum (with Pin 1 at 40V) and carrying up to 1.5A switch current. |
| 3 | Timing Capacitor | passive | Connection for the oscillator timing capacitor CT, which sets the switching frequency (33kHz typical with CT=1.0nF). |
| 4 | Gnd | power_in | Ground pin of the device. |
| 5 | Comparator Inverting Input | input | Inverting input of the comparator compared against the 1.25V reference (threshold 1.25V typical), with input range -0.3 to +40V. |
| 6 | VCC | power_in | Supply voltage input, operating from 3.0V to 40V with 40V absolute maximum. |
| 7 | Ipk Sense | input | Peak current sense input for the current limit circuit, with a current limit sense voltage of 300mV typical (250 to 350mV). |
| 8 | Driver Collector | passive | Collector of the internal driver transistor, rated 40V maximum collector voltage and 100mA maximum driver collector current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | DIP-8 |
| Category | Power Management ICs |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `MC34063N`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files: `mc34063n-etched.step` / `mc34063n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mc34063n.step` / `mc34063n.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HGSEMI datasheet](docs/mc34063n-datasheet.pdf) (12 pp, sha256 `5213ed0d26fa8e18`, retrieved 2026-10-28, 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/mc34063n-datasheet.pdf)