LM337

@@ -0,0 +1,47 @@+# LM337++**Texas Instruments** · Adjustable negative linear regulator · TO-220++The negative-rail complement of the LM317: a 3-terminal adjustable linear regulator that produces a negative output from -1.2 V down to -37 V at up to 1.5 A, in a TO-220. Two resistors between ADJ and OUTPUT set the voltage (VOUT = -1.25 V times (1 + R2/R1)), and it holds a fixed 1.25 V reference between ADJ and OUT. It brings the same internal current limiting, thermal shutdown, and safe-operating-area protection as the LM317. Note the pinout differs from the LM317: here pin 1 = ADJ, pin 2 = VIN, pin 3 = VOUT. Use it with an LM317 to build a dual-rail supply.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | ADJUSTMENT | input | Adjustment pin for the output voltage. Connect two external resistors between OUTPUT, ADJUSTMENT, and ground to set the output voltage; typical ADJUSTMENT current is 65 uA (100 uA max). Reference voltage from OUTPUT to ADJUSTMENT is -1.25 V (typ). |+| 2 | INPUT | power_in | Negative input supply voltage (V_I). Input-to-output differential voltage range is -2.5 V to -37 V (abs max -40 V). Recommend a 0.1-uF bypass capacitor across the input. |+| 3 | OUTPUT | power_out | Regulated negative output voltage (V_O), adjustable from -1.2 V to -37 V. Peak output current 1.5 A (2.2 A typ). Recommend a 1-uF output capacitor for stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Adjustable negative linear regulator |+| Output voltage | -1.2 to -37 V |+| Output current | up to 1.5 A |+| Reference | 1.25 V (ADJ to OUT) |+| Protection | Current limit + SOA + thermal shutdown |+| Pinout | 1=ADJ, 2=VIN, 3=VOUT |+| Line regulation | typ. 0.01 %/V |+| Package | TO-220 (3-lead) |++## Ordering variants++- `LM337KCT (TO-220)`+- `LM337KTTR (TO-220, tape & reel)`++## CAD (KiCad official)++- Symbol: `Regulator_Linear:LM337_TO220`+- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`+- 3D model: TO-220 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm337.pdf) (25 pp, sha256 `9314cd867e85589c`, 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/lm337-datasheet.pdf)

@@ -0,0 +1,36 @@+{+  "slug": "lm337",+  "version": "0.1.0",+  "type": "component",+  "description": "TI adjustable negative linear regulator, TO-220. -1.2 to -37 V, 1.5 A. The negative complement of LM317. Datasheet-verified.",+  "tags": [+    "component",+    "voltage-regulator",+    "linear-regulator",+    "negative",+    "adjustable",+    "to-220",+    "texas-instruments"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "lm337.kicad_sym",+    "lm337.kicad_mod",+    "lm337.glb",+    "docs/hero.png",+    "docs/lm337-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file