# TC4427

**Microchip** · Gate Driver · SOIC-8

The TC4427 is a dual high-speed MOSFET gate driver that sources and sinks up to 1.5 A to drive power-MOSFET gates quickly. Its two non-inverting channels charge a 1000 pF gate in under 30 ns, buffering weak logic outputs to switch power stages, motor drivers, and switching supplies. Inverting (TC4426) and complementary (TC4428) versions share the family.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | NC | unconnected | No internal connection. Leave floating or tie to a convenient net. |
| 2 | IN_A | input | Non-inverting logic input for channel A driver. VIH ≥ 2.4V, VIL ≤ 0.8V, IIN ±1 µA typical; withstands negative inputs down to VDD+0.3V / (GND-5V). Ground any unused driver input. |
| 3 | GND | power_in | Device ground. Common return for logic and the high-current MOSFET output stage; requires a low-inductance path to the source of the driven power MOSFET. |
| 4 | IN_B | input | Non-inverting logic input for channel B driver. Same electrical characteristics as IN A (VIH ≥ 2.4V, VIL ≤ 0.8V). Ground if unused. |
| 5 | OUT_B | output | Non-inverting high-current gate-drive output for channel B. 1.5A peak, ~7Ω output impedance, VOH ≈ VDD-0.025V, VOL ≈ 0.025V. Sources/sinks gate charge to switch a power MOSFET. |
| 6 | VDD | power_in | Positive supply, 4.5V to 18V (22V absolute max). Bypass locally with a low-ESR capacitor sized for the gate charge being switched, since peak output current is 1.5A. |
| 7 | OUT_A | output | Non-inverting high-current gate-drive output for channel A. 1.5A peak, ~7Ω output impedance, VOH ≈ VDD-0.025V, VOL ≈ 0.025V. |
| 8 | NC | unconnected | No internal connection. Leave floating or tie to a convenient net. |

## Key specifications

| Parameter | Value |
|---|---|
| Type | Dual non-inverting MOSFET gate driver |
| Peak output current | 1.5 A source/sink |
| Supply voltage | 4.5 V to 18 V |
| Rise/fall time | <30 ns into 1000 pF |
| Propagation delay | 30 ns typ |
| Operating temperature | -40 C to 85 C |

## Ordering variants

Same part, different packaging or reel option.

- `TC4427OA`
- `TC4427EOA`
- `TC4427VOA`
- `TC4427CPA`
- `TC4427EPA`
- `TC4427VPA`
- `TC4427CUA`
- `TC4427EUA`
- `TC4427VUA`
- `TC4427CMF`
- `TC4427EMF`
- `TC4427VMF`

## CAD (KiCad official)

- Symbol: `tc4427.kicad_sym`
- Footprint: `tc4427.kicad_mod`
- 3D model: SOIC-8 body from KiCad `Package_SO/SOIC-8_3.9x4.9mm_P1.27mm`.
- 3D model files: `tc4427-etched.step` / `tc4427-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tc4427.step` / `tc4427.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip datasheet](https://ww1.microchip.com/downloads/en/DeviceDoc/20001422G.pdf) (28 pp, sha256 `4704cae2316fdff9`, retrieved 2026-08-17, tier: manufacturer)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tc4427-datasheet.pdf)