# LM2596SX-12-JSM

**JSMSEMI** · DC-DC Converters · TO-263-5

LM2596SX-12-JSM from JSMSEMI, in a TO-263-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | power_in | Supply input pin, operating range 4.5V~40V (60V for HV models); place a large capacitor between VIN and GND to suppress supply noise. |
| 2 | OUTPUT | output | Power switch output pin, a switching node that supplies the output load. |
| 3 | GND | power_in | Ground pin; in layout it should be placed on the ground return path of the output capacitor, apart from the Schottky diode, to keep switching current spikes from adding noise. |
| 4 | FEEDBACK | input | Voltage feedback pin that monitors the output voltage through an external resistor divider, with a feedback threshold voltage of 1.23V. |
| 5 | ON_OFF | input | Enable pin: a low level turns the chip on, a high level turns it off, and it defaults to low when floating. |
| 6 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| Package | TO-263-5 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `LM2596SX-12-JSM`
- Footprint: `Package_TO_SOT_SMD:TO-263-5_TabPin6`
- 3D model: TO-263-5 (KiCad packages3D, STEP)
- 3D model files: `lm2596sx-12-jsm-etched.step` / `lm2596sx-12-jsm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2596sx-12-jsm.step` / `lm2596sx-12-jsm.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [JSMSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603353237760327680) (10 pp, sha256 `a271e578a0d6d8e7`, retrieved 2026-10-18, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-5-5` (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).

[Datasheet PDF](docs/lm2596sx-12-jsm-datasheet.pdf)