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UC3844AD8

Public Made by Adom

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Texas Instruments AC-DC Controllers And Regulators, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentpower management (pmic)uc3844ad8factory-2.0.0extractor-text

Verified UC3844AD8

by Ray · last 5 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

5 Nov 2026RayPublished by the parts factory: tier mfr, 8 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: UC3844AD8 · SOIC-8 · 8 pins
  • ✓copper: 8 copper pads, none touching another net
  • ✓datasheet: all 8 pin names found in the 55-page datasheet
  • ✓distributor: lcsc C133841, digikey 296-11290-5-ND, mouser 595-UC3844AD8
  • ✓family: SOIC-8_3.9x4.9mm_P1.27mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-vlj6we10/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 8 pins = 8 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 8 pins agree
  • ✓symbol_text: no pin names collide
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ uc3844ad8.kicad_sym✓ uc3844ad8.kicad_mod✓ uc3844ad8.step
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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs Publish 0.1.0 · Ray 1d ago
viewers uc3844ad8: viewers · Ray 1d ago
package.json Publish 0.1.0 · Ray 1d ago
page.json Set visibility: public · Ray 1d ago
README.md Publish 0.1.0 · Ray 1d ago
uc3844ad8-etched.glb Publish 0.1.0 · Ray 1d ago
uc3844ad8-etched.step uc3844ad8: factory component page (tier=mfr) · Ray 1d ago
uc3844ad8-hero.glb uc3844ad8: hero GLB from the etched model (keeps the MPN mark) · Ray 1d ago
uc3844ad8-hero.overlay.json Publish 0.1.0 · Ray 1d ago
uc3844ad8.glb Publish 0.1.0 · Ray 1d ago
uc3844ad8.kicad_mod Publish 0.1.0 · Ray 1d ago
uc3844ad8.kicad_sym Publish 0.1.0 · Ray 1d ago
uc3844ad8.lbr Publish 0.1.0 · Ray 1d ago
uc3844ad8.step Publish 0.1.0 · Ray 1d ago
verification.json Verified: Published by the parts factory: tier mfr, 8 pins · Ray 1d ago

UC3844AD8

Texas Instruments · AC-DC Controllers And Regulators · SOIC-8

UC3844AD8 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 Output of the low-impedance 1-MHz internal error amplifier, which is also the input to the peak current limit/PWM comparator, with open-loop gain of 80 dB; it can sink a maximum of 6 mA and is not internally current limited.
2 FB input Input to the error amplifier that can be used to control the power converter voltage-feedback loop for stability.
3 ISENSE input Input to the peak current limit and PWM comparator, where the maximum peak current sense signal is internally clamped to 1 V.
4 RT/CT input Input to the internal oscillator programmed by an external timing resistor (RT) and timing capacitor (CT); TI recommends CT from 470 pF to 4.7 nF and RT from 5 kΩ to 100 kΩ.
5 GND power_in This is the controller signal ground.
6 OUTPUT output Output of the 1-A totem-pole gate driver that can sink and source up to 1 A of gate driver current, and a gate driver resistor must be used to limit that current.
7 VCC power_in Bias input to the gate driver, which must have a biasing capacitor at least 10 times greater than the gate capacitance of the main switching FET used in the design.
8 VREF power_in Reference voltage output that must supply no more than 10 mA under normal operation, is short-circuit protected at roughly 100 mA, and needs a 1 µF high-frequency bypass capacitor.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Power Management (PMIC)
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Supply voltage VCC pin VCC 30 V Low impedance source 5
Output current IOUT -1 1 A 5
Analog inputs -0.3 6.3 V 5
Error amplifier output sink current ICOMP 10 mA 5
Power dissipation 1 W TA ≤ 25°C 5
Lead temperature (soldering, 10 s) 300 °C 10 s 5
Junction temperature TJ -55 150 °C 5
Storage temperature Tstg -65 150 °C 5
Bias supply voltage VCC pin VCC 11 V 5
Voltage on analog pins FB, ISENSE, and RT/CT VFB, VRC, VVFB -0.1 5 V 5
Oscillator frequency fOSC 500 kHz 5
Output current VREF pin IVREF 10 mA 5
Operating free-air temperature UC384xA TA 0 70 °C 5
Junction-to-ambient thermal resistance D (SOIC) 8 pins RθJA 117.4 °C/W 6
Junction-to-case (top) thermal resistance D (SOIC) 8 pins RθJC(top) 51.5 °C/W 6
Junction-to-board thermal resistance D (SOIC) 8 pins RθJB 61 °C/W 6
Output voltage UC384xA VREF 4.9 5 5.1 V TJ = 25°C, IO = 1 mA 6
Total output variation UC384xA VREF 4.82 5.18 V Line, Load, Temperature 6
Line regulation 6 20 mV 12 ≤ VIN ≤ 25 V 6
Load regulation 6 25 mV 1 ≤ IO ≤ 20 mA 6
Temperature stability 0.2 0.4 mV/°C See (1) (6) 6
Output short circuit -30 -100 -180 mA 6
Initial accuracy 47 52 57 kHz TJ = 25°C 6
Voltage stability 0.2 1 % 12 ≤ VCC ≤ 25 V 6
Temperature stability oscillator 5 % TMIN ≤ TA ≤ TMAX 6
Discharge current UC384xA 7.6 8.8 mA VRT/CT = 2 V 6
Input voltage UC384xA 2.42 2.5 2.58 V VCOMP = 2.5 V 7
Open-loop gain AVOL AVOL 65 90 dB 2 ≤ VO ≤ 4 V 7
Unity gain bandwidth 0.7 1 MHz TJ = 25°C 7
Common mode rejection ratio CMRR CMRR 60 70 dB 12 ≤ VCC ≤ 25 V 7
Output sink current 2 6 mA VFB = 2.7 V, VCOMP = 1.1 V 7
Output source current -0.5 -0.8 mA VFB = 2.3 V, VCOMP = 5 V 7
VOUT high VOUT 5 6 V VFB = 2.3 V, RL = 15 kΩ to ground 7
VOUT low VOUT 0.7 1.1 V VFB = 2.7 V, RL = 15 kΩ to VREF 7
Gain A 2.85 3 3.15 V/V 0 ≤ VISENSE ≤ 0.8 V 7
Maximum input signal 0.9 1 1.1 V VCOMP = 5 V 7
Delay to output 150 300 ns VISENSE = 0 to 2 V 7
Output low level ISINK 20 mA 0.1 0.4 V ISINK = 20 mA 7
Output low level ISINK 200 mA 1.5 2.2 V ISINK = 200 mA 7
Output high level ISOURCE 20 mA 13 13.5 V ISOURCE = 20 mA 7
Output high level ISOURCE 200 mA 12 13.5 V ISOURCE = 200 mA 7
Rise time 25 150 ns TJ = 25°C, CL = 1 nF 7
Fall time 25 150 ns TJ = 25°C, CL = 1 nF 7
UVLO saturation 0.7 1.2 V VCC = 5 V, ISINK = 10 mA 7
Start threshold UC3842A and UC3844A 14.5 16 17.5 V 7
Minimum operation voltage after turnon UC3842A and UC3844A 8.5 10 11.5 V 7
Maximum duty cycle UCx844A 46 48 50 % 7
Start-up current 0.3 0.5 mA 7
Operating supply current 11 17 mA VFB = VISENSE = 0 V 7
VCC Zener voltage 30 39 V ICC = 25 mA 7

CAD (KiCad official)

  • Symbol: UC3844AD8
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: uc3844ad8-etched.step / uc3844ad8-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3844ad8.step / uc3844ad8.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (55 pp, sha256 e255958b7704edfb, retrieved 2026-11-05, tier: manufacturer)
  • 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