# UCC21540ADWR

**Texas Instruments** · Isolators - Gate Drivers · SOIC-16-300mil

UCC21540ADWR from Texas Instruments, in a SOIC-16-300mil. 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 | INA | input | Input signal for channel A with TTL/CMOS compatible threshold and 0.8V input hysteresis; internally pulled low when open circuit. |
| 2 | INB | input | Input signal for channel B with TTL/CMOS compatible threshold and 0.8V input hysteresis; internally pulled low when open circuit. |
| 3 | VCCI | power_in | Primary side power supply voltage with 3V to 18V operating range; decouple locally to GND with low ESR/ESL capacitor. |
| 4 | GND | power_in | Primary side ground reference; all primary side signals referenced to this ground. |
| 5 | DIS | input | Disable input; when set high disables both driver outputs; when set low enables outputs; recommended 1nF bypass capacitor for noise immunity. |
| 6 | DT | input | Dead time programming pin; connect to VCCI to disable dead time function or place resistor RDT between DT and GND to program dead time using DT(ns) = 10 × RDT(kΩ); recommended ≤1nF bypass capacitor. |
| 7 | NC | unconnected | No internal connection; can be left floating or connected to VCCI or GND. |
| 8 | VCCI | power_in | Primary side power supply voltage internally shorted to pin 3; preferred to bypass pins 3-4 rather than pins 8-4. |
| 9 | VSSB | power_in | Secondary side ground for driver B; ground reference for secondary side channel B. |
| 10 | OUTB | output | Driver B output for controlling B channel FET or IGBT gate; peak sink current 6A maximum. |
| 11 | VDDB | power_in | Secondary side power supply for driver B with 6.5V to 25V operating range; decouple locally to VSSB with low ESR/ESL capacitor. |
| 12 | NC | unconnected | No internal connection; recommended to leave floating to maximize creepage distance from driver A to driver B. |
| 13 | NC | unconnected | No internal connection; recommended to leave floating to maximize creepage distance from driver A to driver B; this pin is removed in SOIC-14 DWK package. |
| 14 | VSSA | power_in | Secondary side ground for driver A; ground reference for secondary side channel A. |
| 15 | OUTA | output | Driver A output for controlling A channel FET or IGBT gate; peak source current 4A maximum. |
| 16 | VDDA | power_in | Secondary side power supply for driver A with 6.5V to 25V operating range; decouple locally to VSSA with low ESR/ESL capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Power Management (PMIC) |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `UCC21540ADWR`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files: `ucc21540adwr-etched.step` / `ucc21540adwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ucc21540adwr.step` / `ucc21540adwr.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/ucc21540a) (54 pp, sha256 `436d808da2107def`, retrieved 2026-10-05, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/ucc21540adwr-datasheet.pdf)