component
UCC21521CDWR
Public Made by Adomby adom
Texas Instruments Isolators - Gate Drivers, SOIC-16-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownUCC21521CDWR
Texas Instruments · Isolators - Gate Drivers · SOIC-16-300mil
UCC21521CDWR 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 the A channel with a TTL/CMOS compatible threshold; the pin is pulled low internally if left open and should be tied to ground if unused. |
| 2 | INB | input | Input signal for the B channel with a TTL/CMOS compatible threshold; the pin is pulled low internally if left open and should be tied to ground if unused. |
| 3 | VCCI | power_in | Primary-side supply voltage (3 V to 18 V recommended range), locally decoupled to GND with a low ESR/ESL capacitor placed as close to the device as possible. |
| 4 | GND | power_in | Primary-side ground reference; all primary-side signals are referenced to this pin. |
| 5 | EN | input | Enables both driver outputs when high or left open (internally pulled high) and disables the outputs when low; tying it to VCCI is recommended for better noise immunity when unused. |
| 6 | DT | input | Programmable dead-time pin: tying it to VCCI allows overlap, while a 500 Ω to 500 kΩ resistor to GND sets dead time as DT (ns) = 10 × RDT (kΩ), with a ceramic capacitor of 2.2 nF or above recommended in parallel; leaving it floating is not recommended. |
| 7 | NC | unconnected | No internal connection. |
| 8 | VCCI | power_in | Primary-side supply voltage, internally shorted to pin 3 (VCCI), so it should be connected and decoupled alongside pin 3. |
| 9 | VSSB | power_in | Ground for the secondary-side driver B and its ground reference for the B channel. |
| 10 | OUTB | output | Output of driver B; connect to the gate of the B-channel FET or IGBT. |
| 11 | VDDB | power_in | Secondary-side power for driver B, to be locally decoupled to VSSB with a low ESR/ESL capacitor placed as close to the device as possible. |
| 12 | NC | unconnected | No internal connection. |
| 13 | NC | unconnected | No internal connection. |
| 14 | VSSA | power_in | Ground for secondary-side driver A and its ground reference for the A channel. |
| 15 | OUTA | output | Output of driver A; connect to the gate of the A-channel FET or IGBT. |
| 16 | VDDA | power_in | Secondary-side power for driver A, to be locally decoupled to VSSA with a low ESR/ESL capacitor placed as close to the device as possible. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Power Management (PMIC) |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
UCC21521CDWR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files:
ucc21521cdwr-etched.step/ucc21521cdwr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ucc21521cdwr.step/ucc21521cdwr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (50 pp, sha256
93b1d040e8ae41ee, retrieved 2026-10-07, 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, primaryclaude-haiku-5-5(text), consensusclaude-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).