# TRACO Power TSR 2-2450

Step-down switching regulator module, 5 V 2 A output, 6.5-36 V input, SIP-3 (LM78xx pin-compatible).

| | |
|---|---|
| Manufacturer | TRACO Power |
| MPN | TSR 2-2450 |
| Category | power (DC/DC switching regulator module (78xx replacement)) |
| Package | SIP-3, 2.54 mm pitch, 14.0 x 7.5 x 10.1 mm |
| DigiKey | [1951-2692-ND](https://www.digikey.com/en/products/detail/traco-power/TSR-2-2450/9383726) |
| Mouser | [495-TSR2-2450](https://www.mouser.com/ProductDetail/495-TSR2-2450) |
| LCSC | [C5198099](https://www.lcsc.com/product-detail/C5198099.html) |
| Datasheet | [tsr2_datasheet.pdf](https://www.tracopower.com/sites/default/files/products/datasheets/tsr2_datasheet.pdf) |

Distributor numbers and stock from the LEDster-TI BOM, checked 2026-11-02: DigiKey 1951-2692-ND (stock 7148), Mouser 495-TSR2-2450 (stock 3277), LCSC C5198099 (stock 1).

## Files

- `tsr-2-2450.kicad_mod` footprint (KiCad)
- `tsr-2-2450.kicad_sym` symbol (KiCad)
- `tsr-2-2450.step` 3D model (STEP, Z-up, body seated on z = 0 via its 0.5 mm stand-off feet, pins below the board, origin = pin 1)
- `tsr-2-2450.lbr` Fusion / EAGLE library part (adom-lbr from the files above with this page's metadata; no embedded 3D, bind the STEP)

## Provenance

- `tsr-2-2450.kicad_mod`: KiCad `Converter_DCDC:Converter_DCDC_TRACO_TSR2-xxxx_THT` (https://gitlab.com/kicad/libraries/kicad-footprints/-/raw/master/Converter_DCDC.pretty/Converter_DCDC_TRACO_TSR2-xxxx_THT.kicad_mod, sha256/16 635b90558bb70236), model path changed to `tsr-2-2450.step`. Checked against the TRACO TSR 2 datasheet (https://www.tracopower.com/sites/default/files/products/datasheets/tsr2_datasheet.pdf, Rev. October 8, 2026, p.4 "Outline Dimensions"): pins 1-2-3 at 2.54 mm pitch; body 14.0 x 7.50 mm; pin 3 is 4.5 mm and pin 1 4.42 mm (14.0 - 4.5 - 5.08) from the body ends; pin row 3.89 mm from one long face. The KiCad fab outline is x -3.89..3.61, y -4.42..9.58: identical. Drill 1.1 mm for the 0.46 mm square pin (diagonal 0.65 mm); the datasheet gives no hole size.
- `tsr-2-2450.step`: AI-created from the TRACO TSR 2 datasheet p.4 (Outline Dimensions). TRACO's own STEP (tsr2_3d_drawing.stp) is behind a registration form with a bot check on tracopower.com and was not downloaded; KiCad packages3D has no TSR2 model. Envelope model: body 14.0 x 7.50 mm, top at 10.1 mm, standing on two 0.5 mm stand-off feet (0.5 mm wide, full depth) at the ends; three 0.46 x 0.46 mm pins from z = -4.1 to the body. Written directly in the footprint frame (STEP y = -footprint y) by a small B-rep box writer (adom boxstep.py) and checked on the step2glb OCCT service (`step2glb features`). Not a manufacturer model; no internal detail.
- Which long face the 3.89 mm is measured from is read from the third-angle bottom view (the pin-1 dot face); KiCad's footprint makes the same choice (pin-1 marker on the 3.89 mm side). Datasheet tolerance x.xx +/-0.5 mm.
- Upstream terms: KiCad official library (gitlab.com/kicad/libraries/kicad-footprints, kicad-packages3D and kicad-symbols, master, fetched 2026-11-02). License: CC-BY-SA 4.0 with the KiCad libraries exception (using these files in a design, and distributing the design or its manufacturing output, does not require the design to be licensed under CC-BY-SA).
- `tsr-2-2450.kicad_sym`: KiCad `Regulator_Linear:L7812` (which `extends` `L7805`; resolved) used as a generic 3-pin regulator symbol: pins 1 VI, 2 GND, 3 VO (renamed from IN / OUT), renamed to the MPN. TRACO pinout (datasheet p.4): 1 +Vin, 2 GND, 3 +Vout.

## License

Adom-authored content CC-BY-4.0; third-party files keep their upstream terms (see `LICENSE`).