# DSB221SDN 38.400MHZ 3.3V 0.5PPM

**KDS Daishinku** · Temperature Compensated Crystal Oscillators (TCXO) · SMD2520-4P

DSB221SDN 38.400MHZ 3.3V 0.5PPM from KDS Daishinku, in a SMD2520-4P. 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 | GND | power_in | On the TCXO DSB221SDN without stand-by this pin is connected to GND; on the VC-TCXO it is Vcont and on the DSB221SDNB it is ENABLE/DISABLE. |
| 2 | GND | power_in | Ground connection of the oscillator. |
| 3 | Output | output | Clipped sine, DC-coupled frequency output of 0.8Vp-p min. (f≦52MHz) into a 10kΩ//10pF load. |
| 4 | Vcc | power_in | Supply voltage pin for a range of +1.68 to +3.5V (3.3V nominal for this MPN), with max. 2.0mA consumption for 26MHz<f≦52MHz. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KDS Daishinku |
| Package | SMD2520-4P |
| Category | Crystals, Oscillators, Resonators |
| Pins | 4 |

## CAD (KiCad official)

- Symbol: `DSB221SDN 38.400MHZ 3.3V 0.5PPM`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `dsb221sdn-38-400mhz-3-3v-0-5ppm-etched.step` / `dsb221sdn-38-400mhz-3-3v-0-5ppm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dsb221sdn-38-400mhz-3-3v-0-5ppm.step` / `dsb221sdn-38-400mhz-3-3v-0-5ppm.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KDS Daishinku datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884592513699840) (2 pp, sha256 `f7af7fc17899ef3d`, retrieved 2026-10-26, 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` (text+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/dsb221sdn-38-400mhz-3-3v-0-5ppm-datasheet.pdf)