component
UC3844D8TR
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
markdownUC3844D8TR
Texas Instruments · AC-DC Controllers And Regulators · SOIC-8
UC3844D8TR 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. Connect external compensation elements to modify error amplifier output; internal current limiting allows forcing COMP to GROUND externally to control zero duty cycle. |
| 2 | VFB | input | Inverting input of internal error amplifier used to control power converter voltage feedback loop for stability. |
| 3 | ISENSE | input | Primary side current sensing pin connected to current sense resistor; PWM uses this signal to terminate OUTPUT switch conduction; voltage ramp can be applied for voltage mode control configuration. |
| 4 | RT/CT | bidirectional | Fixed frequency oscillator setting point; timing resistor RRT connects from this pin to VREF and timing capacitor CCT connects to GROUND to set switching frequency; keep timing capacitor leads as short as possible and directly connected to device GROUND. |
| 5 | GROUND | power_in | Analog ground. For device packages without PWRGND, GROUND serves as both power ground and analog ground. |
| 6 | OUTPUT | output | Gate driver for external MOSFET; on-chip driver output designed to directly drive MOSFET with peak current up to 1A sourced and sunk; actively held low when VCC is below turn-on threshold. |
| 7 | VCC | power_in | Analog controller bias input for powering the device; total VCC current equals static VCC current plus average OUTPUT current; requires 0.1µF bypass capacitor directly connected to GROUND with minimal trace length. |
| 8 | VREF | power_in | 5V reference voltage providing charging current to oscillator timing capacitor through timing resistor; bypass to ground with ceramic capacitor placed close to pin connection; minimum 0.1µF ceramic capacitor required for reference stability. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
UC3844D8TR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
uc3844d8tr-etched.step/uc3844d8tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3844d8tr.step/uc3844d8tr.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 2026-10-07, 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-4-5-20251001(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).