# ECS-TXO-3225-147.4-TR

**ECS** · Pre-ordered Products · SMD3225-4P

ECS-TXO-3225-147.4-TR from ECS, 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 | N/C or VCONT | input | No connect on the ECS-TXO-3225 TCXO, or control voltage input on the ECS-VTXO-3225 VC-TCXO option (+0.15 V min, +1.65 V typ, +3.15 V max). |
| 2 | GND | power_in | Ground connection. |
| 3 | OUTPUT | output | HCMOS clock output driving up to 15 pF CMOS load, with VOL max 0.5 V and VOH min 80% VDD. |
| 4 | VDD | power_in | Supply voltage pin, 3.135 V min, 3.3 V typ, 3.465 V max. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD3225-4P |
| Category | Electronic Tools/Instruments/Consumables |
| 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 |
|---|---|---|---|---|---|---|---|
| Nominal frequency |  |  | 14.7456 |  | MHz | Developed frequency abbreviation 147.4 | 2 |
| Frequency stability vs temperature |  | -2.5 |  | 2.5 | PPM | Vs. Temp (-30 ~ +85°C); blank suffix = ±2.5 ppm | 1 |
| Operating temperature |  | -30 |  | 85 | °C | Standard grade (blank suffix) | 1 |
| Input voltage VDD | VDD | 3.135 | 3.3 | 3.465 | VDC |  | 1 |
| Frequency stability vs supply change |  | -0.3 |  | 0.3 | PPM | Vs. Supply Change (±5%) | 1 |
| Frequency stability vs load change |  | -0.3 |  | 0.3 | PPM | Vs. Load Change (±5%) | 1 |
| Frequency stability vs aging |  | -1 |  | 1 | PPM | Vs. Aging/Year | 1 |
| Current consumption | IDD |  |  | 6 | mA |  | 1 |
| Output low level | VOL |  |  | 0.5 | VDC | "0" Level | 1 |
| Output high level | VOH | 80 |  |  | % VDD | "1" Level | 1 |
| Output symmetry |  | 40 |  | 60 | % | @50% VDD Level | 1 |
| Rise and fall time |  |  |  | 10 | ns | 10% VDD to 90% Level | 1 |
| Start-up time |  |  |  | 2 | mS |  | 1 |
| Phase noise |  |  |  | -135 | DBc/Hz | @ 1 KHz Offset | 1 |
| Storage temperature |  | -40 |  | 90 | °C |  | 1 |

## 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 |
|---|---|---|---|---|
| contacts |  | gold | • Lead Finish Au Part Numbering Guide: Example ECS-TXO-3225-250-TR | 1 |

## CAD (KiCad official)

- Symbol: `ECS-TXO-3225-147.4-TR`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-txo-3225-147-4-tr-etched.step` / `ecs-txo-3225-147-4-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-txo-3225-147-4-tr.step` / `ecs-txo-3225-147-4-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-txo-3225-147-4-tr-datasheet.pdf) (2 pp, sha256 `03856238f17eb7a1`, retrieved 2026-11-08, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/ecs-txo-3225-147-4-tr-datasheet.pdf)