cjt1117b-1-8

@@ -0,0 +1,43 @@+# CJT1117B-1.8++**Changjing** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223++CJT1117B-1.8 from Changjing, in a SOT-223. 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 | GND | power_in | Ground return for the regulator. On the fixed-voltage CJT1117B-1.8 variant this pin is the device ground reference (labeled ADJ/GND on the package; the ADJ function is used only on the -ADJ variant). Tie directly to system ground. |+| 2 | OUTPUT | power_out | Regulated 1.8V output (1.764V-1.836V over line/load, 10mA-1A). Requires a >=22uF tantalum output capacitor to ground for stability. The SOT-223 tab (pin 4) is internally connected to this OUTPUT pin. |+| 3 | IN | power_in | Unregulated input supply, 3.3V to 12V for the -1.8 variant (absolute max 20V). Bypass with a 10uF tantalum capacitor to ground close to the pin. |+| 4 | OUTPUT | power_out | SOT-223 thermal tab, internally connected to the OUTPUT pin (pin 2). Should be soldered to a copper pour tied to VOUT for heatsinking (RθJA = 100 °C/W). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Changjing |+| Package | SOT-223 |+| Category | PMIC |+| Pins | 4 |++## Ordering variants++- `CJT1117B-1.8`++## CAD (KiCad official)++- Symbol: `CJT1117B-1.8`+- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`+- 3D model: SOT-223 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Changjing datasheet](docs/cjt1117b-1-8-datasheet.pdf) (None pp, sha256 `a86693ffbb7cce0d`, retrieved 2026-08-17, tier: lcsc)+- **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/cjt1117b-1-8-datasheet.pdf)

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