# 1XXB38400MEA

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

1XXB38400MEA 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 | Ground connection; pin #1 is also the index corner (#1 Index) and is one of two GND pins listed in the Pin Connections table. |
| 2 | GND | power_in | Ground connection; listed as GND in the Pin Connections table alongside pin #1. |
| 3 | Output | output | TCXO clipped sine wave output (DC-coupled) with minimum output level 0.8 VP-P, measured into LOAD_R 10 kΩ ±10% // LOAD_C 10 pF ±10%. |
| 4 | VCC | power_in | Supply voltage input; recommended VCC is +1.7 V min, +1.8 V typ, +3.3 V max, with absolute maximum rating -0.3 to +4.6 V. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VCC | -0.3 |  | 4.6 | V |  | 1 |
| Storage Temperature Range | T_STG | -30 |  | 85 | °C |  | 1 |
| Supply Voltage | VCC | 1.7 | 1.8 | 3.3 | V |  | 1 |
| Load Impedance (resistance part) | LOAD_R | 9 | 10 | 11 | kΩ |  | 1 |
| Load Impedance (parallel capacitance) | LOAD_C | 9 | 10 | 11 | pF |  | 1 |
| Operating Temperature Range | T_OPR | -30 |  | 85 | °C |  | 1 |
| Current Consumption |  |  |  | 2 | mA |  | 1 |
| Output Level |  | 0.8 |  |  | VP-P | Note 1: clipped sine wave (DC-coupled) | 1 |
| Harmonics |  |  |  | -5 | dBc |  | 1 |
| Frequency Stability - Tolerance |  | -1.5 |  | 1.5 | ppm | After 2 times reflow; ref. to frequency before reflow; notes 2 and 3 | 1 |
| Frequency Stability - vs Temperature |  | -0.5 |  | 0.5 | ppm | TA=-30~+85°C; ref. to frequency at TA=+25°C | 1 |
| Frequency Stability - vs Supply Voltage |  | -0.2 |  | 0.2 | ppm | VCC=+1.8V±5% | 1 |
| Frequency Stability - vs Load Variation |  | -0.2 |  | 0.2 | ppm | LOAD_R//C=(10kΩ//10pF)±10% | 1 |
| Frequency Stability - vs Aging |  | -1 |  | 1 | ppm/year | TA=Room ambient | 1 |
| Start Up Time |  |  |  | 2 | ms | @90% of final Vout level | 1 |
| SSB Phase Noise |  |  |  | -125 | dBc/Hz | Relative to f0 level, offset 1kHz | 1 |

## CAD (KiCad official)

- Symbol: `1XXB38400MEA`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `1xxb38400mea-etched.step` / `1xxb38400mea-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1xxb38400mea.step` / `1xxb38400mea.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/8588910975596969984) (2 pp, sha256 `8b979f83a0da1688`, retrieved 2026-10-16, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/1xxb38400mea-datasheet.pdf)