LM1117-3.3

@@ -0,0 +1,48 @@+# LM1117++**Texas Instruments** · 800 mA LDO regulator (fixed 3.3 V) · SOT-223++An 800 mA low-dropout linear regulator fixed at 3.3 V, in the SOT-223 tab package, TI's take on the ubiquitous 3.3 V rail supply. It regulates a higher input down to 3.3 V with about 1.2 V of dropout at full load, and includes current limiting and thermal shutdown. Like the AMS1117 it needs a 10 uF output capacitor (tantalum or ceramic) for stability, and the tab is the output and heat path. It also comes in adjustable and other fixed voltages; this page is the fixed 3.3 V. Pinout is GND, VOUT (tab), VIN.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | ADJ/GND | input | Adjust pin for the adjustable (LM1117-ADJ) option: connects to the top of an external resistor divider from VOUT to set VOUT = 1.25 V x (1 + R2/R1); adjust-pin current is 60 uA typical (120 uA max over temperature). For fixed-voltage options this pin is ground (0 V reference). |+| 2 | VOUT | power_out | Regulated output voltage pin, up to 800 mA of load current. Requires a minimum 10-uF tantalum capacitor to GND for output stability and transient response. Electrically the same net as pin 4 and the tab. |+| 3 | VIN | power_in | Unregulated input voltage pin, recommended operating range up to 15 V (absolute max 20 V to GND). Must be at least VOUT + 1.2 V (dropout at 800 mA) for the regulator to remain in regulation. Bypass with an input capacitor close to the pin. |+| 4 | VOUT | power_out | Regulated output voltage pin (same net as pin 2 and the SOT-223 tab). Included on the SOT-223 (DCY) package as a second output lead to help distribute the 800 mA output current. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Fixed LDO linear regulator |+| Output voltage | 3.3 V (fixed) |+| Output current | 800 mA |+| Dropout | 1.2 V max at 800 mA |+| Protection | current limit + thermal shutdown |+| Output cap | 10 µF (stability) |+| Pinout | 1=GND, 2=VOUT (tab), 3=VIN |+| Package | SOT-223 |++## Ordering variants++- `LM1117MP-3.3 (SOT-223)`+- `LM1117MPX-3.3 (SOT-223, tape & reel)`++## CAD (KiCad official)++- Symbol: `Regulator_Linear:LM1117DT-3.3`+- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`+- 3D model: SOT-223 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm1117.pdf) (46 pp, sha256 `35892f3a8673fae9`, 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/lm1117-datasheet.pdf)

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