UC2842AD8TR
Public Unreviewedby Ray
Texas Instruments AC-DC Controllers and Regulators, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads on click. Unloads when scrolled away or the tab is hidden.
Symbol & Footprint
Schematic Symbol
Open full view ↗PCB Footprint
Open full view ↗Datasheet
Open in new tab ↗Contents
README
markdownUC2842AD8TR
Texas Instruments · AC-DC Controllers and Regulators · SOIC-8
UC2842AD8TR 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 | COMP | output | Error amplifier output / compensation node. Low-impedance 1-MHz internal error amplifier output that also drives the input to the peak current-limit or PWM comparator. Open-loop gain (AVOL) 80 dB; sinks up to 6 mA and is not internally current limited. |
| 2 | FB | input | Inverting input to the error amplifier. Used to control the power-converter voltage-feedback loop for regulation and stability. |
| 3 | ISENSE | input | Current-sense input to the peak current-limit and PWM comparator. With an external current-sense resistor, the error-amplifier output voltage controls cycle-by-cycle peak current. Maximum peak sense signal internally clamped to 1 V. |
| 4 | RT/CT | input | Oscillator timing pin. Programmed with an external timing resistor (RT) and timing capacitor (CT). TI recommends CT of 470 pF to 4.7 nF and RT of 5 kΩ to 100 kΩ. Supports operation up to 500 kHz. |
| 5 | GND | power_in | Controller signal ground. Common return for signal-level circuitry and (on the 8-pin package) also the gate-driver return. |
| 6 | OUTPUT | output | 1-A totem-pole gate-driver output. Sinks and sources up to 1 A for driving an external power MOSFET. A gate resistor must be used to limit drive current. |
| 7 | VCC | power_in | Bias supply input for the controller and gate driver. Absolute-maximum 30 V; nominal bias 11 V (recommended). Requires a bypass capacitor at least 10x greater than the gate capacitance of the switching FET. |
| 8 | VREF | power_out | 5-V reference voltage output. Supplies up to 10 mA under normal operation and is short-circuit protected at roughly 100 mA. Also feeds internal comparators; requires a 1-µF bypass capacitor, and the VCC bypass must be at least 10x the VREF capacitor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | PMIC |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
UC2842AD8TRDUC2842AD8TRUC2842AD8TRDRUC2842AD8TRPUC2842AD8TRNUC2842AD8TRJGUC2842AD8TRDWUC2842AD8TRFKUC2842AD8TRFN
CAD (KiCad official)
- Symbol:
UC2842AD8TR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
uc2842ad8tr.step |
122 KB | You want the bare part, or you mark your own boards. |
uc2842ad8tr-etched.step |
2.5 MB | You want the part with UC2842AD8TR already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 604 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (48 pp, sha256
b7a86a285e909cbc, 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).