component
UC2845D8TR
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, SOIC-8. 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
markdownUC2845D8TR
Texas Instruments · AC-DC Controllers And Regulators · SOIC-8
UC2845D8TR 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 compensation pin accepting external compensation networks; internal current limiting permits forcing COMP to GROUND to control zero duty cycle. |
| 2 | VFB | input | Inverting input of internal error amplifier for controlling power supply converter voltage feedback loop to achieve stability; maintain shortest possible leads and minimal stray capacitance. |
| 3 | ISENSE | input | Primary side current sensing input connected to current sense resistor with maximum input voltage of 1V; PWM comparator uses this signal to terminate OUTPUT switch turn-on. |
| 4 | RT/CT | bidirectional | Oscillator timing pin where timing resistor RRT (≥5kΩ) connects to VREF and timing capacitor CCT connects to GROUND to set switching frequency from 100kHz to 500kHz per fOSC = 1.72/(RRT×CCT). |
| 5 | GROUND | power_in | Analog signal ground and power return path; for packages without separate PWRGND, this pin serves as both power and signal ground. |
| 6 | OUTPUT | output | Gate driver output capable of sourcing and sinking ±1A peak current to directly drive external MOSFET; actively held low when VCC is below UVLO turn-on threshold. |
| 7 | VCC | power_in | Power supply input for analog controller bias requiring 0.1µF minimum bypass capacitor directly connected to GROUND with minimum wire length; recommended voltage 12V to 28V with maximum static current 17mA at 15V. |
| 8 | VREF | power_in | Internal 5V reference voltage (±2% tolerance for UC284x) used to supply charging current to oscillator timing capacitor; requires 0.1µF minimum ceramic bypass capacitor placed as close as possible to pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
UC2845D8TR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
uc2845d8tr-etched.step/uc2845d8tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc2845d8tr.step/uc2845d8tr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (61 pp, sha256
0f875fd24cbb5fda, retrieved 2026-09-22, 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 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).