# ECS-TXO-2520-33-120-AN-TR

**ECS** · Pre-ordered Products · SMD2520-4P

ECS-TXO-2520-33-120-AN-TR from ECS, 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 | Tri-state | tri_state | Tri-state pin: the output is active when this pin is high or not connected, and disables the output to Hi-Z when low. |
| 2 | Gnd | power_in | Ground connection for the TCXO. |
| 3 | Output | output | HCMOS clock output with VOL max 10% Vdd and VOH min 90% Vdd, driving a 15 pF load. |
| 4 | Vdd | power_in | Supply voltage Vdd, specified by the part number as +2.5, +2.8 or +3.3 V ±10%. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD2520-4P |
| 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 |
|---|---|---|---|---|---|---|---|
| Frequency stability tolerance (part-number code A) |  | -2.5 |  | 2.5 | ppm | Part-number tolerance code A (±2.5 ppm) | 1 |
| Frequency stability vs. temperature |  | -2.5 |  | 2.5 | ppm | Vs. Temp (-40 ~ +85°C) | 1 |
| Voltage change |  | -0.2 |  | 0.2 | ppm | Voltage Change Vdd ±5% | 1 |
| Load change |  | -0.2 |  | 0.2 | ppm | Load Change (±10%) | 1 |
| Aging |  | -1 |  | 1 | ppm | Per year @ +25°C | 1 |
| Operating temperature range |  | -40 |  | 85 | °C | Temp range code N | 1 |
| Supply voltage (Vdd) | Vdd |  | 3.3 |  | V | Supply code 33, ±10% | 1 |
| Current consumption |  |  |  | 4.8 | mA | +3.3V, 10.1~20 MHz band | 1 |
| Output voltage low | VOL |  |  | 10 | %Vdd |  | 1 |
| Output voltage high | VOH | 90 |  |  | %Vdd |  | 1 |
| Duty cycle |  | 45 |  | 55 | % | @ ½ Vdd | 1 |
| Standby current |  |  | 10 |  | µA |  | 1 |
| Rise and fall time |  |  | 5 |  | ns | 10%Vdd, 90%Vdd | 1 |
| Output load |  |  | 15 |  | pF | HCMOS output | 1 |
| Phase noise |  |  | -145 |  | dBc/Hz | @ 10 kHz offset | 1 |
| Nominal frequency |  |  | 12 |  | MHz | Frequency code 120 (12.000 MHz) | 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 |
|---|---|---|---|---|
| contacts |  | gold | MSL 1, Lead Finish Au FREQUENCY ABBREVIATIONS | 2 |

## CAD (KiCad official)

- Symbol: `ECS-TXO-2520-33-120-AN-TR`
- Footprint: `Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-txo-2520-33-120-an-tr-etched.step` / `ecs-txo-2520-33-120-an-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-txo-2520-33-120-an-tr.step` / `ecs-txo-2520-33-120-an-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-txo-2520-33-120-an-tr-datasheet.pdf) (2 pp, sha256 `ff95b59ff8d90046`, retrieved 2026-11-02, 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/ecs-txo-2520-33-120-an-tr-datasheet.pdf)