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UC3842D8TR
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.
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UC3842D8TR
Texas Instruments · AC-DC Controllers And Regulators · SOIC-8
UC3842D8TR 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 10mA current limit for external feedback network connection. |
| 2 | VFB | input | Error amplifier inverting input with nominal bias point 2.5V and input bias current -1µA to -2µA. |
| 3 | ISENSE | input | Primary-side current sense input with 1V maximum signal threshold and internal 3V/V gain to COMP. |
| 4 | RT/CT | bidirectional | Oscillator RC timing pin for frequency setting from 100kHz to 500kHz using RRT (5kΩ to 100kΩ) and CCT (1nF to 100nF). |
| 5 | GROUND | power_in | Analog signal and power supply return reference with short direct connection to ground plane required. |
| 6 | OUTPUT | output | MOSFET gate driver output with 1A peak source and sink capability, actively held low below UVLO threshold. |
| 7 | VCC | power_in | Analog bias supply input accepting 12V to 28V with 0.1µF bypass capacitor and startup current less than 1mA. |
| 8 | VREF | power_in | Internal 5V ±2% precision reference output with 30mA source capability for oscillator and error amplifier biasing. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
UC3842D8TR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
uc3842d8tr-etched.step/uc3842d8tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3842d8tr.step/uc3842d8tr.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 2026-10-03, 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).
# UC3842D8TR
**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-8
UC3842D8TR 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 10mA current limit for external feedback network connection. |
| 2 | VFB | input | Error amplifier inverting input with nominal bias point 2.5V and input bias current -1µA to -2µA. |
| 3 | ISENSE | input | Primary-side current sense input with 1V maximum signal threshold and internal 3V/V gain to COMP. |
| 4 | RT/CT | bidirectional | Oscillator RC timing pin for frequency setting from 100kHz to 500kHz using RRT (5kΩ to 100kΩ) and CCT (1nF to 100nF). |
| 5 | GROUND | power_in | Analog signal and power supply return reference with short direct connection to ground plane required. |
| 6 | OUTPUT | output | MOSFET gate driver output with 1A peak source and sink capability, actively held low below UVLO threshold. |
| 7 | VCC | power_in | Analog bias supply input accepting 12V to 28V with 0.1µF bypass capacitor and startup current less than 1mA. |
| 8 | VREF | power_in | Internal 5V ±2% precision reference output with 30mA source capability for oscillator and error amplifier biasing. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
## CAD (KiCad official)
- Symbol: `UC3842D8TR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `uc3842d8tr-etched.step` / `uc3842d8tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc3842d8tr.step` / `uc3842d8tr.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/uc3842) (61 pp, sha256 `0f875fd24cbb5fda`, retrieved 2026-10-03, 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`, primary `claude-haiku-4-5-20251001` (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](docs/uc3842d8tr-datasheet.pdf)