# SX32Y040000BC1T001

**TKD** · Quartz crystal, 40 MHz · SMD 3225, 4 pads

TKD 40 MHz fundamental quartz crystal in a 3.2 x 2.5 mm ceramic SMD package: 12 pF load, +/-10 ppm tolerance. Pads 1 and 3 are the crystal, 2 and 4 the lid ground.

## Verification

A person checks each page against its datasheet and signs it off here; the badge turns amber if a checked file changes.

::adom-verified{src="/adom/sx32y040000bc1t001/render/verification.json"}

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | 1 | passive | Crystal (datasheet p.1, "Pin Connect": #1 #3 Crystal). |
| 2 | G | passive | Ground (lid). |
| 3 | 3 | passive | Crystal. |
| 4 | G | passive | Ground (lid). |

**Note:** pads 2 and 4 are both ground (the metal lid). The symbol has one G pin numbered `[2,4]`, KiCad's stacked-pin notation, so wiring that pin connects both pads; the Fusion library connects G to pads "2 4" and the Altium library stacks pins 2 and 4.

## Key specifications

| Parameter | Value | Source |
|---|---|---|
| Frequency | 40 MHz | LCSC listing (2026-10-08) |
| Load capacitance | 12 pF | LCSC listing (2026-10-08) |
| Frequency tolerance | +/-10 ppm | LCSC listing (2026-10-08) |
| Frequency stability | +/-30 ppm | LCSC listing (2026-10-08) |
| ESR | 20 ohm max | LCSC listing (2026-10-08) |
| Operating temperature | -40 to +85 C | LCSC listing (2026-10-08) |
| Package | 3.2 x 2.5 x 0.7 mm | Datasheet p.1 |

## Ordering

| Distributor | Part number | Note |
|---|---|---|
| LCSC / JLCPCB | [C337678](https://www.lcsc.com/product-detail/C337678.html) | JLC Extended part, 16,900 in stock on 2026-10-08 |
| Mouser | not listed | no listing for this manufacturer's part (searched 2026-10-08) |
| DigiKey | not listed | no listing for this manufacturer's part (searched 2026-10-08) |

## CAD

| File | What it is |
|---|---|
| `sx32y040000bc1t001.kicad_sym` | KiCad symbol, with MPN, manufacturer and distributor numbers as properties |
| `sx32y040000bc1t001.kicad_mod` | KiCad footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`, KiCad official, CC-BY-SA 4.0 |
| `sx32y040000bc1t001.step` / `sx32y040000bc1t001.glb` | 3D model, Z-up, seated on z = 0: KiCad packages3D (tag 10.0.6), Crystal_SMD_3225-4Pin_3.2x2.5mm.step |
| `sx32y040000bc1t001-etched.step` / `sx32y040000bc1t001-etched.glb` | The same model with the part number laser-etched on top as a separate, toggleable `Adom.LaserEtch` group (a virtual identification aid, not the maker's real marking) |
| `sx32y040000bc1t001.lbr` | Fusion 360 / EAGLE library: one deviceset, each with its own MPN, manufacturer and LCSC / Mouser / DigiKey attributes |
| `altium/Adom_sx32y040000bc1t001.SchLib` / `.PcbLib` | Altium library pair (adom-lbr, no Altium needed): symbol and footprint with the 3D body, parameters carry the part numbers; `altium/*.adom-lbr.json` is the canonical hub each was built from |

## Provenance

- **Datasheet:** [docs/sx32y040000bc1t001-datasheet.pdf](docs/sx32y040000bc1t001-datasheet.pdf), sha256 `9cc54142928f868c`, retrieved 2026-10-08 from LCSC
- **Specs:** each row names its source: the manufacturer datasheet (with page) or the LCSC parametric listing (retrieved 2026-10-08).
- **Distributor numbers:** looked up 2026-10-08 with adom-parts-search (Mouser, DigiKey, JLCPCB), exact part number and manufacturer only.
- **CAD:** footprint `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`; 3D: KiCad packages3D (tag 10.0.6), Crystal_SMD_3225-4Pin_3.2x2.5mm.step.

## Related

- Used on the [AM/FM Receiver Molecule](https://wiki.adom.inc/adom/amfm-receiver-molecule).