# MC34063ADG

**onsemi** · DC-DC Converters · SOIC-8

MC34063ADG from onsemi, 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 | Collector of the internal output switch, rated 40 V with switch current up to 1.5 A. |
| 2 | Switch Emitter | output | Emitter of the internal output switch, rated 40 V (VPin 1 = 40 V). |
| 3 | Timing Capacitor | passive | Timing capacitor connection that sets the oscillator frequency and duty cycle, with CT = 1.0 nF used in the stated test conditions. |
| 4 | GND | power_in | Ground reference for the device. |
| 5 | Inverting Input | input | Inverting input of the internal comparator, compared against the 1.25 V reference, with comparator input voltage range of -0.3 V to +40 V. |
| 6 | VCC | power_in | Supply voltage input, with power supply voltage rated 40 V maximum and operation from 3.0 V. |
| 7 | Ipk Sense | input | Current limit sense input, with current limit sense voltage of 250 mV to 350 mV (300 mV typical). |
| 8 | Driver Collector | output | Collector of the internal driver transistor, rated 40 V with driver collector current up to 100 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-8 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Frequency | fosc | 24 | 33 | 42 | kHz | VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C | 3 |
| Charge Current | Ichg | 24 | 35 | 42 | A | VCC = 5.0 V to 40 V, TA = 25°C | 3 |
| Discharge Current | Idischg | 140 | 220 | 260 | A | VCC = 5.0 V to 40 V, TA = 25°C | 3 |
| Discharge to Charge Current Ratio | Idischg/Ichg | 5.2 | 6.5 | 7.5 | − | Pin 7 to VCC, TA = 25°C | 3 |
| Current Limit Sense Voltage | Vipk(sense) | 250 | 300 | 350 | mV | Ichg = Idischg, TA = 25°C | 3 |
| Saturation Voltage, Darlington Connection | VCE(sat) |  | 1 | 1.3 | V | ISW = 1.0 A, Pins 1, 8 connected | 3 |
| Saturation Voltage (non-Darlington) | VCE(sat) |  | 0.45 | 0.7 | V | ISW = 1.0 A, RPin 8 = 82 Ω to VCC, Forced β = 20 | 3 |
| DC Current Gain | hFE | 50 | 75 |  | − | ISW = 1.0 A, VCE = 5.0 V, TA = 25°C | 3 |
| Collector Off-State Current | IC(off) |  | 0.01 | 100 | A | VCE = 40 V | 3 |
| Threshold Voltage | Vth | 1.225 | 1.25 | 1.275 | V | TA = 25°C | 3 |
| Threshold Voltage over temperature | Vth | 1.21 |  | 1.29 | V | TA = Tlow to Thigh | 3 |
| Threshold Voltage Line Regulation | Regline |  | 1.4 | 5 | mV | VCC = 3.0 V to 40 V | 3 |
| Input Bias Current | IIB |  | -20 | -400 | nA | Vin = 0 V | 3 |
| Supply Current | ICC |  |  | 4 | mA | VCC = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC, VPin 5 > Vth, Pin 2 = GND, remaining pins open | 3 |
| Power Supply Voltage | VCC |  |  | 40 | Vdc |  | 2 |
| Comparator Input Voltage Range | VIR | -0.3 |  | 40 | Vdc |  | 2 |
| Switch Collector Voltage | VC(switch) |  |  | 40 | Vdc |  | 2 |
| Switch Emitter Voltage | VE(switch) |  |  | 40 | Vdc | VPin 1 = 40 V | 2 |
| Switch Collector to Emitter Voltage | VCE(switch) |  |  | 40 | Vdc |  | 2 |
| Driver Collector Voltage | VC(driver) |  |  | 40 | Vdc |  | 2 |
| Driver Collector Current | IC(driver) |  |  | 100 | mA |  | 2 |
| Switch Current | ISW |  |  | 1.5 | A |  | 2 |
| Power Dissipation, SOIC package | PD |  |  | 625 | mW | TA = 25°C | 2 |
| Thermal Resistance Junction-to-Ambient, SOIC package | RθJA |  |  | 160 | °C/W |  | 2 |
| Thermal Resistance Junction-to-Case, SOIC package | RθJC |  |  | 45 | °C/W |  | 2 |
| Operating Junction Temperature | TJ |  |  | 150 | °C |  | 2 |
| Operating Ambient Temperature Range | TA | 0 |  | 70 | °C | MC34063A, SC34063A | 2 |
| Storage Temperature Range | Tstg | -65 |  | 150 | °C |  | 2 |

## CAD (KiCad official)

- Symbol: `MC34063ADG`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `mc34063adg-etched.step` / `mc34063adg-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mc34063adg.step` / `mc34063adg.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/mc34063a-d.pdf) (17 pp, sha256 `ebc110d24bfb7a44`, retrieved 2026-10-26, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `off` (skipped (clean text read)), 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/mc34063adg-datasheet.pdf)