# MC34063ADR

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

MC34063ADR from Texas Instruments, 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 | Switch Collector | bidirectional | High-current internal switch collector input. |
| 2 | Switch Emitter | bidirectional | High-current internal switch emitter output. |
| 3 | Timing Capacitor | passive | Attach a timing capacitor to change the switching frequency. |
| 4 | GND | power_in | Ground. |
| 5 | Comparator Inverting Input | input | Attach to a resistor divider network to create a feedback loop. |
| 6 | VCC | power_in | Logic supply voltage; tie to VIN. |
| 7 | IPK | input | Current-limit sense input. |
| 8 | Driver Collector | bidirectional | Darlington pair driving transistor collector input. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC |  |  | 40 | V |  | 4 |
| Comparator inverting input voltage range | VIR | -0.3 |  | 40 | V |  | 4 |
| Switch collector voltage | VC(switch) |  |  | 40 | V |  | 4 |
| Switch emitter voltage | VE(switch) |  |  | 40 | V | VPIN1 = 40 V | 4 |
| Switch collector to switch emitter voltage | VCE(switch) |  |  | 40 | V |  | 4 |
| Driver collector voltage | VC(driver) |  |  | 40 | V |  | 4 |
| Driver collector current | IC(driver) |  |  | 100 | mA |  | 4 |
| Switch current | ISW |  |  | 1.5 | A |  | 4 |
| Operating virtual junction temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 4 |
| Supply voltage | VCC | 3 |  | 40 | V |  | 4 |
| Operating free-air temperature (MC34063A) | TA | 0 |  | 70 | °C | MC34063A | 4 |
| Junction-to-ambient thermal resistance (D package) | RθJA |  | 97 |  | °C/W | D package (SOIC-8); table header names MC33063A | 4 |
| Oscillator frequency | fosc | 24 | 33 | 42 | kHz | VPIN5 = 0 V, CT = 1 nF, TA = 25°C | 4 |
| Charge current | Ichg | 24 | 35 | 42 | μA | VCC = 5 V to 40 V, TA = 25°C | 4 |
| Discharge current | Idischg | 140 | 220 | 260 | μA | VCC = 5 V to 40 V, TA = 25°C | 4 |
| Discharge-to-charge current ratio | Idischg/Ichg | 5.2 | 6.5 | 7.5 | — | VPIN7 = VCC, TA = 25°C | 4 |
| Current-limit sense voltage | VIpk | 250 | 300 | 350 | mV | Idischg = Ichg, TA = 25°C | 4 |
| Saturation voltage – Darlington connection | VCE(sat) |  | 1 | 1.3 | V | ISW = 1 A, pins 1 and 8 connected, full operating range | 5 |
| Saturation voltage – non-Darlington connection | VCE(sat) |  | 0.45 | 0.7 | V | ISW = 1 A, RPIN8 = 82 Ω to VCC, forced β ∼ 20, full operating range | 5 |
| DC current gain | hFE | 50 | 75 |  | — | ISW = 1 A, VCE = 5 V, TA = 25°C | 5 |
| Collector off-state current | IC(off) |  | 0.01 | 100 | μA | VCE = 40 V, full operating range | 5 |
| Threshold voltage | Vth | 1.225 | 1.25 | 1.275 | V | VCC = 5 V, TA = 25°C | 5 |
| Threshold voltage | Vth | 1.21 |  | 1.29 | V | VCC = 5 V, full operating range | 5 |
| Threshold-voltage line regulation | ΔVth |  | 1.4 | 5 | mV | VCC = 5 V to 40 V, full operating range | 5 |
| Input bias current | IIB |  | -20 | -400 | nA | VIN = 0 V, full operating range | 5 |
| Supply current | ICC |  |  | 4 | mA | VCC = 5 V to 40 V, CT = 1 nF, VPIN7 = VCC, VPIN5 > Vth, VPIN2 = GND, all other pins open, full operating range | 5 |

## CAD (KiCad official)

- Symbol: `MC34063ADR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `mc34063adr-etched.step` / `mc34063adr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mc34063adr.step` / `mc34063adr.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/lit/ds/symlink/mc34063a.pdf) (32 pp, sha256 `bad86a3b68c35766`, retrieved 2026-09-17, tier: manufacturer)
- **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/mc34063adr-datasheet.pdf)