# MC34063ACD-TR

**STMicroelectronics** · DC-DC Converters · SOIC-8

MC34063ACD-TR from STMicroelectronics, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SWC | output | Switch collector of internal Darlington output switch, rated for 1.5 A continuous current and 40 V maximum. |
| 2 | SWE | output | Switch emitter of internal output switch with saturation voltage 1.3 V (Darlington) or 0.7 V (forced high current). |
| 3 | TC | passive | Timing capacitor connection for oscillator frequency programming up to 100 kHz. |
| 4 | GND | power_in | Ground reference for all signal return paths. |
| 5 | CII | input | Comparator inverting input with 1.25 V threshold voltage and input range -0.3 to 40 V. |
| 6 | VCC | power_in | Power supply input with operating range 3-40 V and absolute maximum 50 V. |
| 7 | IPK | input | Current sense input for active current limiting with 300 mV sense threshold. |
| 8 | DRC | output | Output driver collector with 40 V maximum voltage rating and 100 mA maximum current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Oscillator frequency | fOSC | 24 | 33 | 42 | kHz | VPIN5 = 0V, CT = 1 nF, TA = 25°C | 6 |
| Charge current | ICHG | 24 | 33 | 42 | µA | VCC = 5 to 40V, TA = 25°C | 6 |
| Discharge current | IDISCHG | 140 | 200 | 260 | µA | VCC = 5 to 40V, TA = 25°C | 6 |
| Discharge to charge current ratio | IDISCHG/ICHG | 5.2 | 6.2 | 7.5 | µA | PIN 7 = VCC, TA = 25°C | 6 |
| Current limit sense voltage | VIPK(sense) | 250 | 300 | 350 | mV | ICHG = IDISCHG, TA = 25°C | 6 |
| Saturation voltage, Darlington connection | VCE(sat) |  | 1 | 1.3 | V | ISW = 1 A, PIN 1, 8 connected | 6 |
| Saturation voltage (forced beta ~20) | VCE(sat) |  | 0.45 | 0.7 | V | ISW = 1 A, RPIN8 = 82 to VCC, Forced ~ 20 | 6 |
| DC current gain | hFE | 50 | 120 |  |  | ISW = 1 A, VCE = 5 V, TA = 25°C | 6 |
| Collector off-state current | IC(off) |  | 0.01 | 100 | µA | VCE = 40 V | 6 |
| Threshold voltage | VTH | 1.225 | 1.25 | 1.275 | V | TA = 25°C | 6 |
| Threshold voltage over temperature | VTH | 1.21 |  | 1.29 | V | TA = TLOW to THIGH | 6 |
| Threshold voltage line regulation | Regline |  | 1 | 5 | mV | VCC = 3 to 40 V | 6 |
| Input bias current | IIB |  | -5 | -400 | nA | VIN = 0 V | 6 |
| Supply current (MC34063A) | ICC |  | 2.5 | 4 | mA | VCC = 5 to 40 V, CT = 1 nF, PIN 7 = VCC, VPIN5 > VTH, PIN 2 = GND | 7 |
| Start-up voltage (MC34063A) | VSTART-UP |  | 2.1 |  | V | TA = 25°C, CT = 1 µF, PIN 5 = 0 | 7 |
| Power supply voltage | VCC |  |  | 50 | V |  | 5 |
| Comparator input voltage range | VIR | -0.3 |  | 40 | V |  | 5 |
| Switch collector voltage | VSWC |  |  | 40 | V |  | 5 |
| Switch emitter voltage | VSWE |  |  | 40 | V | VSWC = 40V | 5 |
| Switch collector to emitter voltage | VCE |  |  | 40 | V |  | 5 |
| Driver collector voltage | VDC |  |  | 40 | V |  | 5 |
| Driver collector current | IDC |  |  | 100 | mA |  | 5 |
| Switch current | ISW |  |  | 1.5 | A |  | 5 |
| Power dissipation (SO-8) | PTOT |  |  | 0.625 | W | TA = 25°C, SO-8 | 5 |
| Operating junction temperature | TJ |  |  | 150 | °C |  | 5 |
| Storage temperature range | TSTG | -40 |  | 150 | °C |  | 5 |
| Operating ambient temperature range (AC series) | TOP | 0 |  | 70 | °C | AC series | 5 |
| Thermal resistance junction-ambient (SO-8) | RthJA |  | 160 |  | °C/W | SO-8, depends on PCB thermal design | 5 |
| Thermal resistance junction-case (SO-8) | RthJC |  | 20 |  | °C/W | SO-8 | 5 |

## CAD (KiCad official)

- Symbol: `MC34063ACD-TR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `mc34063acd-tr-etched.step` / `mc34063acd-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mc34063acd-tr.step` / `mc34063acd-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8579714104384278528) (23 pp, sha256 `90208f64b7a5ca67`, retrieved 2026-09-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/mc34063acd-tr-datasheet.pdf)