component
1XTW29491PAA
Public Made by Adomby adom
KDS Daishinku Temperature Compensated Crystal Oscillators (TCXOs), SMD3225-4P. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdown1XTW29491PAA
KDS Daishinku · Temperature Compensated Crystal Oscillators (TCXOs) · SMD3225-4P
1XTW29491PAA from KDS Daishinku, in a SMD3225-4P. 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 the indexed pin of the DSB321SDN TCXO. |
| 2 | GND | power_in | Ground connection of the TCXO, tied to the measurement-circuit GND. |
| 3 | Output | output | Clipped sine wave (DC-coupled) output, min 0.8 Vp-p into 10 kΩ // 10 pF load. |
| 4 | VCC | power_in | Supply voltage input, +2.85 to +3.15 V (typ +3.0 V), absolute maximum -0.3 to +4.6 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | KDS Daishinku |
| Package | SMD3225-4P |
| 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 | 2 | ||
| Storage Temperature Range | T_STG | -55 | 105 | °C | 2 | ||
| Supply Voltage | VCC | 2.85 | 3 | 3.15 | V | 2 | |
| Load Impedance (resistance part) | LOAD_R | 9 | 10 | 11 | kΩ | 2 | |
| Load Impedance (parallel capacitance) | LOAD_C | 9 | 10 | 11 | pF | 2 | |
| Operating Temperature Range | T_OPR | -30 | 85 | °C | 2 | ||
| Nominal Frequency | 29.4912 | MHz | 2 | ||||
| Current Consumption | 2 | mA | TA=-40~+85°C, LOAD_R//C=10kΩ//10pF, VCC=+3.0V | 2 | |||
| Output Level | 0.8 | VP-P | Clipped sine wave (DC-coupled) | 2 | |||
| Symmetry | 40 | 60 | % | GND level (DC cut) | 2 | ||
| Harmonics | -5 | dBc | 2 | ||||
| Frequency Tolerance | -1.5 | 1.5 | ppm | After 2 times reflow, ref. to nominal frequency, TA=+25°C | 2 | ||
| Frequency vs Temperature | -2 | 2 | ppm | TA=-30~+80°C, ref. to frequency (TA=+25°C) | 2 | ||
| Frequency vs Supply Voltage | -0.2 | 0.2 | ppm | VCC=+3.0V±0.15V | 2 | ||
| Frequency vs Load Variation | -0.2 | 0.2 | ppm | LOAD_R//C=(10kΩ//10pF)±5% | 2 | ||
| Frequency Aging per day | -0.02 | 0.02 | ppm/day | TA=Room ambient, after 1h of operation | 2 | ||
| Frequency Aging per year | -1 | 1 | ppm/year | TA=Room ambient, after 1h of operation | 2 | ||
| Start Up Time | 2 | ms | @90% of final Vout level | 2 | |||
| SSB Phase Noise | -80 | dBc/Hz | Relative to f0 level offset 10Hz | 2 | |||
| SSB Phase Noise | -110 | dBc/Hz | Relative to f0 level offset 100Hz | 2 | |||
| SSB Phase Noise | -130 | dBc/Hz | Relative to f0 level offset 1kHz | 2 | |||
| SSB Phase Noise | -140 | dBc/Hz | Relative to f0 level offset 10kHz | 2 | |||
| SSB Phase Noise | -143 | dBc/Hz | Relative to f0 level offset 100kHz | 2 | |||
| SSB Phase Noise | -145 | dBc/Hz | Relative to f0 level offset 1MHz | 2 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | PET | Cover Tape : PET + Olefin Resin (Conductivity) | 8 | |
| contacts | silver | Leads, such as solder, are not used for this product. (Lead Free) 17.6 About the existence of silver and mercury use | 13 |
CAD (KiCad official)
- Symbol:
1XTW29491PAA - Footprint:
Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm - 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files:
1xtw29491paa-etched.step/1xtw29491paa-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1xtw29491paa.step/1xtw29491paa.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: KDS Daishinku datasheet (14 pp, sha256
9139d916ab0359cd, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).