component
UC3842BD
Public Made by Adomby adom
COSINE AC-DC Controllers And Regulators, SOP-8. Datasheet-verified pinout, 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
markdownUC3842BD
COSINE · AC-DC Controllers And Regulators · SOP-8
UC3842BD from COSINE, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | COMP | output | Output of error amplifier for compensation; connect external compensation components to this pin or externally force to GROUND to command zero duty cycle. |
| 2 | VFB | input | Inverting input to error amplifier, normally connected to switching power supply output through resistor divider. |
| 3 | ISENSE | input | Input for voltage proportional to inductor current to terminate output switch conduction; voltage ramp can be applied for voltage-mode control configuration. |
| 4 | RT/CT | bidirectional | Program oscillator frequency and maximum output duty cycle by connecting resistor RT to VREF and capacitor CT to ground; operation up to 1 MHz is possible. |
| 5 | GROUND | power_in | Ground return pin functioning as both power ground and analog ground. |
| 6 | OUTPUT | output | Output of on-chip drive stage directly driving power MOSFET gate with peak current up to 1 A sourced and sunk; output is actively held low when VCC is below turnon threshold. |
| 7 | VCC | power_in | Power supply pin for control IC (7.6 V to 30 V); bypass with 0.1 µF ceramic low ESL capacitor with minimal trace lengths and additional bypass capacitor at least 10 times greater than gate capacitance of main switching MOSFET. |
| 8 | VREF | power_in | 5 V reference providing charging current for capacitor CT through resistor RT; bypass with 0.1 µF ceramic low ESL capacitor with minimal trace length to ground plane. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | COSINE |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
UC3842BD - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
uc3842bd-etched.step/uc3842bd-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3842bd.step/uc3842bd.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: COSINE datasheet (10 pp, sha256
60a0f42408f6f9e3, retrieved 2026-09-21, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).