component
UC3843D8TR
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
markdownUC3843D8TR
Texas Instruments · AC-DC Controllers And Regulators · SOIC-8
UC3843D8TR from Texas Instruments, in a SOIC-8. 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 | COMP | output | Error amplifier compensation pin with internal current limiting, allows zero duty cycle control by forcing externally to ground, accepts external compensation network components. |
| 2 | VFB | input | Inverting input to error amplifier with 2.5V reference voltage, used for voltage feedback control loop requiring minimal trace length and parasitic capacitance. |
| 3 | ISENSE | input | Primary-side current sense input connected to sense resistor, accepts maximum 1V signal, PWM comparator uses this to terminate output switch conduction and implement current mode control. |
| 4 | RT/CT | bidirectional | Oscillator timing pin with external RRT resistor to VREF and CCT capacitor to ground setting switching frequency per fOSC = 1.72/(RRT·CCT) from 100kHz to 500kHz. |
| 5 | GROUND | power_in | Analog ground and power return, serves as combined analog and power ground for device packages without separate PWRGND. |
| 6 | OUTPUT | output | Gate driver output providing ±1A peak current for direct MOSFET gate drive, actively held low when VCC is below UVLO threshold. |
| 7 | VCC | power_in | Analog controller bias supply input 12V to 28V, total current sum of static current (11-17mA) and average output current based on MOSFET gate charge and switching frequency. |
| 8 | VREF | power_in | 5V precision reference voltage output ±2% with 30mA maximum short circuit current, provides timing current to oscillator and bias to error amplifier reference input. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
UC3843D8TR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
uc3843d8tr-etched.step/uc3843d8tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3843d8tr.step/uc3843d8tr.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 2026-09-24, 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-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).