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UCC21521CDWR

Public Made by Adom

by adom

Texas Instruments Isolators - Gate Drivers, SOIC-16-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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UCC21521CDWR

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ucc21521cdwr.step / ucc21521cdwr.glb are 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, primary claude-haiku-5-5 (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