UC3842BD1R2G

@@ -0,0 +1,54 @@+# UC3842BD1R2G++**onsemi** · AC-DC Controllers and Regulators · SOIC-8++UC3842BD1R2G from onsemi, in a SOIC-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 | Compensation | output | Error amplifier output made available for loop compensation. External compensation network is tied between this pin and the Voltage Feedback input (pin 2). |+| 2 | Voltage Feedback | input | Inverting input of the error amplifier. Normally connected to the switching power supply output through a resistor divider; nominal reference at this node is 2.5 V. |+| 3 | Current Sense | input | Non-inverting input of the current-sense comparator. A voltage proportional to inductor/switch current is applied here; peak current-sense threshold is typically 1.0 V (max) for cycle-by-cycle limiting. |+| 4 | RT/CT | passive | Oscillator timing pin. An external resistor to Vref and a capacitor to ground set the oscillator frequency and maximum output duty cycle. Guaranteed oscillator frequency up to 250 kHz; operational to 500 kHz. |+| 5 | GND | power_in | Device ground and return for both control-signal and high-current output-driver return paths (single-ground SOIC-8 / PDIP-8 variant). |+| 6 | Output | output | High-current totem-pole PWM gate-drive output for directly driving a power MOSFET. Rated 1.0 A source/sink; typical rise/fall times of 50 ns into 1.0 nF. |+| 7 | VCC | power_in | Positive supply voltage for control logic and output driver. UC3842B UVLO turn-on at 16 V (typ) and turn-off at 10 V (typ); maximum rating 30 V. Internal 36 V zener clamp (ICC = 25 mA). |+| 8 | Vref | power_out | Trimmed and temperature-compensated 5.0 V reference output. Typically capable of sourcing 20 mA to external circuitry and provides the pull-up for the RT/CT oscillator resistor. Short-circuit current limited to approximately 85 mA (typ). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | onsemi |+| Package | SOIC-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `UC3842BD1R2GD1`+- `UC3842BD1R2GD1R2G`+- `UC3842BD1R2GD1G`+- `UC3842BD1R2GN`+- `UC3842BD1R2GNG`+- `UC3842BD1R2GD`+- `UC3842BD1R2GDG`+- `UC3842BD1R2GDR2G`++## CAD (KiCad official)++- Symbol: `UC3842BD1R2G`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/uc3842bd1r2-d.pdf) (22 pp, sha256 `581ae31fbd1f3e07`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/uc3842bd1r2g-datasheet.pdf)

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