# MC34063AD

**Texas Instruments** · DC-DC Converters · SOIC-8

MC34063AD from Texas Instruments, in a SOIC-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 | output | High-current internal switch collector output with maximum voltage rating of 40 V; provides switching stage output for DC-DC conversion topologies. |
| 2 | Switch Emitter | output | High-current internal switch emitter output with maximum voltage rating of 40 V; provides return path for the switching stage. |
| 3 | Timing Capacitor | passive | Attach an external timing capacitor to set the oscillator frequency; frequency is inversely proportional to capacitor value. |
| 4 | GND | power_in | Ground reference for the device. |
| 5 | Comparator Inverting Input | input | Comparator inverting input for feedback from resistor divider network; internal threshold voltage is 1.25 V with 2% accuracy. |
| 6 | VCC | power_in | Logic and driver supply voltage with operating range from 3 V to 40 V; should be tied to input voltage VIN. |
| 7 | IPK | input | Current-limit sense input with threshold voltage of 250 mV to 350 mV; monitors internal switch current for short-circuit and overcurrent protection. |
| 8 | Driver Collector | output | Darlington pair driver collector output to drive external high-current switch transistor; maximum collector current is 100 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `MC34063AD`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `mc34063ad-etched.step` / `mc34063ad-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mc34063ad.step` / `mc34063ad.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/mc33063a) (32 pp, sha256 `bad86a3b68c35766`, retrieved 2026-10-03, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/mc34063ad-datasheet.pdf)