# ECS-TXO-25CSMV-400-BN-TR

**ECS** · Temperature Compensated Crystal Oscillators (TCXOs) · SMD2520-4P

ECS-TXO-25CSMV-400-BN-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 | Ground | power_in | Ground (Pin Connections #1). |
| 2 | Ground | power_in | Ground (Pin Connections #2). |
| 3 | Output | output | Clipped sine wave output, 0.8 V p-p into 10 kΩ // 10 pF. |
| 4 | VDD | power_in | Supply, +1.7 to +3.465 VDC. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD2520-4P |
| Category | Crystal Oscillator/Oscillator/Resonator |
| 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 Range |  | 10 |  | 52 | MHz |  | 1 |
| Frequency Tolerance @ +25°C |  | -2 |  | 2 | PPM | @ +25°C ±2°C | 1 |
| Frequency Stability vs. Temp |  | -1 |  | 1 | PPM | -40 ~ +85°C, BN option | 1 |
| Frequency Stability vs. Supply Change |  | -0.2 |  | 0.2 | PPM | Supply change ±5% | 1 |
| Frequency Stability vs. Load Change |  | -0.2 |  | 0.2 | PPM | Load change ±10% | 1 |
| Frequency Stability vs. Aging |  | -1 |  | 1 | PPM | 1st year | 1 |
| Input Voltage | VDD | 1.7 |  | 3.465 | VDC | MultiVolt range | 1 |
| Operating Temperature |  | -40 |  | 85 | °C | N option | 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 • Compatible with 1.8V, 2.5V | 1 |

## CAD (KiCad official)

- Symbol: `ECS-TXO-25CSMV-400-BN-TR`
- Footprint: `Adom_Gen:ECS_Inc._ECS-TXO-_b387af`
- 3D model: SMD2520-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-txo-25csmv-400-bn-etched.step` / `ecs-txo-25csmv-400-bn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-txo-25csmv-400-bn.step` / `ecs-txo-25csmv-400-bn.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-txo-25csmv-400-bn-datasheet.pdf) (2 pp, sha256 `53687e4059f32039`, retrieved 2026-11-12, tier: manufacturer)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ecs-txo-25csmv-400-bn-datasheet.pdf)