component
UC2843AQD8RQ1
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
markdownUC2843AQD8RQ1
Texas Instruments · AC-DC Controllers And Regulators · SOIC-8
UC2843AQD8RQ1 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 | Low-impedance 1-MHz internal error amplifier output, also the input to the peak current limit/PWM comparator, with 90 dB open-loop gain; it can sink a maximum of 6 mA and is not internally current limited. |
| 2 | FB | input | Input to the error amplifier, 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 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 | Controller signal ground. |
| 6 | OUTPUT | output | Output of the 1-A totem-pole gate driver that can source and sink up to 1 A, and a gate driver resistor must be used to limit gate driver current. |
| 7 | VCC | power_in | Bias input to the gate driver, which must have a bias capacitor at least 10 times greater than the gate capacitance of the main switching FET. |
| 8 | VREF | power_out | 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 (VCC capacitor at least 10 times the VREF 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 |
|---|---|---|---|---|---|---|---|
| VCC voltage (low impedance source), VCC pin | 30 | V | low impedance source | 4 | |||
| Output current | IOUT | -1 | 1 | A | 4 | ||
| Output energy (capacitive load) | 5 | µJ | 4 | ||||
| Analog inputs (pins 2, 3, and 4) | -0.3 | 6.3 | V | pins 2, 3, and 4 | 4 | ||
| Maximum negative voltage, All pins | -0.3 | V | All pins | 4 | |||
| Error amplifier output sink current | ICOMP | 10 | mA | 4 | |||
| Power dissipation | 1 | W | TA ≤ 25°C | 4 | |||
| Lead temperature | 300 | °C | soldering, 10 s | 4 | |||
| Junction temperature | TJ | -55 | 150 | °C | 4 | ||
| Storage temperature | Tstg | -65 | 150 | °C | 4 | ||
| Bias supply voltage, VCC pin | VCC | 11 | V | 4 | |||
| Voltage on analog pins FB, ISENSE, and RT/CT | VFB, VRC, VVFB | -0.1 | 5 | V | 4 | ||
| Gate driver output voltage | VOUT | -0.1 | V | 4 | |||
| Supply bias current | IVCC | 25 | mA | 4 | |||
| Output current, VREF pin | IVREF | 10 | mA | 4 | |||
| Oscillator frequency | fOSC | 500 | kHz | 4 | |||
| Operating free-air temperature | TA | -40 | 125 | °C | 4 | ||
| Output voltage | 4.95 | 5 | 5.05 | V | TJ = 25°C, IO = 1 mA | 5 | |
| Line regulation | 6 | 20 | mV | 12 ≤ VIN ≤ 25 V | 5 | ||
| Load regulation | 6 | 25 | mV | 1 ≤ IO ≤ 20 mA | 5 | ||
| Temperature stability | 0.2 | 0.4 | mV/°C | 5 | |||
| Total output variation | 4.9 | 5.1 | V | Line, Load, Temperature | 5 | ||
| Output short circuit | -30 | -100 | -180 | mA | 5 | ||
| Long-term stability | 5 | 25 | mV | TA = 125°C, 1000 hrs | 5 | ||
| Initial accuracy | 47 | 52 | 57 | kHz | TJ = 25°C | 5 | |
| Voltage stability | 0.2 | 1 | % | 12 ≤ VCC ≤ 25 V | 5 | ||
| Discharge current | 7.8 | 8.3 | 8.8 | mA | TJ = 25°C, VRT/CT = 2 V | 5 | |
| Discharge current | 7.5 | 8.8 | mA | VRT/CT = 2 V | 5 | ||
| Input voltage | 2.45 | 2.5 | 2.55 | V | VCOMP = 2.5 V | 6 | |
| Input bias current | -0.3 | -1 | µA | 6 | |||
| AVOL Open-loop gain | AVOL | 65 | 90 | dB | 2 ≤ VO ≤ 4 V | 6 | |
| Unity gain bandwidth | 0.7 | 1 | MHz | TJ = 25°C | 6 | ||
| Common mode rejection ratio | CMRR | 60 | 70 | dB | 12 ≤ VCC ≤ 25 V | 6 | |
| Output sink current | 2 | 6 | mA | VFB = 2.7 V, VCOMP = 1.1 V | 6 | ||
| Output source current | -0.5 | -0.8 | mA | VFB = 2.3 V, VCOMP = 5 V | 6 | ||
| VOUT high | 5 | 6 | V | VFB = 2.3 V, RL = 15 kΩ to ground | 6 | ||
| VOUT low | 0.7 | 1.1 | V | VFB = 2.7 V, RL = 15 kΩ to VREF | 6 | ||
| Gain | 2.85 | 3 | 3.15 | V/V | 6 | ||
| Maximum input signal | 0.9 | 1 | 1.1 | V | VCOMP = 5 V | 6 | |
| Input bias current (ISENSE) | -2 | -10 | µA | 6 | |||
| Delay to output | 150 | 300 | ns | VISENSE = 0 to 2 V | 6 | ||
| Output low level | 0.1 | 0.4 | V | ISINK = 20 mA | 6 | ||
| Output low level | 1.5 | 2.2 | V | ISINK = 200 mA | 6 | ||
| Output high level | 13 | 13.5 | V | ISOURCE = 20 mA | 6 | ||
| Output high level | 12 | 13.5 | V | ISOURCE = 200 mA | 6 | ||
| Rise time | 25 | 150 | ns | TJ = 25°C, CL = 1 nF | 6 | ||
| Fall time | 25 | 150 | ns | TJ = 25°C, CL = 1 nF | 6 | ||
| UVLO saturation | 0.7 | 1.2 | V | VCC = 5 V, ISINK = 10 mA | 6 | ||
| Start threshold | 7.8 | 8.4 | 9 | V | 6 | ||
| Minimum operation voltage after turnon | 7 | 7.6 | 8.2 | V | 6 | ||
| Maximum duty cycle | 92 | 96 | 100 | % | 6 | ||
| Minimum duty cycle | 0 | % | 6 | ||||
| Start-up current | 0.3 | 0.5 | mA | 6 | |||
| Operating supply current | 11 | 17 | mA | VFB = VISENSE = 0 V | 6 | ||
| VCC Zener voltage | 30 | 39 | V | ICC = 25 mA | 6 | ||
| Thermal impedance, junction to ambient (package) | θJA | 117.4 | °C/W | 4 |
CAD (KiCad official)
- Symbol:
UC2843AQD8RQ1 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
uc2843aqd8rq1-etched.step/uc2843aqd8rq1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc2843aqd8rq1.step/uc2843aqd8rq1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (24 pp, sha256
6dc2b496157a1c02, retrieved 2026-10-20, 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-5-5(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).