# ECS-250-12-33-AGN-TR3

**ECS** · Crystals · SMD3225-4P

ECS-250-12-33-AGN-TR3 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 | In/Out | passive | Crystal terminal that is electrically interchangeable with pad 3, and the bottom chamfer on pad 1 has no electrical significance. |
| 2 | Gnd | power_in | Ground connection for the crystal package. |
| 3 | Out/In | passive | Crystal terminal that is electrically interchangeable with pad 1, since the datasheet states the crystal is symmetrical with pads 1 and 3 interchangeable. |
| 4 | Gnd | power_in | Ground connection for the crystal package, and the bottom chamfer may be placed on this pad with no electrical significance. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| 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 |
|---|---|---|---|---|---|---|---|
| Aging (First Year) |  | -5 |  | 5 | ppm | @ +25°C ±3°C, first year | 1 |
| Frequency Tolerance @ +25°C |  | -25 |  | 25 | ppm | @ +25°C; P/N tolerance code A = ±25 ppm | 1 |
| Frequency Stability (over temperature) |  | -30 |  | 30 | ppm | -40 ~ +85°C; P/N stability code G = ±30 ppm, temp code N | 1 |
| Shunt Capacitance | Co |  |  | 5 | pF |  | 1 |
| Drive Level | DL |  |  | 100 | μW |  | 1 |
| Equivalent Series Resistance (ESR) | ESR |  |  | 40 | Ω | 24.000 ~ 54.000 MHz range (25 MHz part) | 1 |
| Operating Temperature | Topr | -40 |  | 85 | °C | Temp range code N (-40 ~ +85°C) per P/N guide | 1 |
| Storage Temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Peak Solder Temperature |  |  |  | 260 | °C | Max 10 sec, 2 cycles max | 2 |
| Nominal Frequency |  |  | 25 |  | MHz | P/N code 250 = 25.000 MHz | 2 |
| Load Capacitance |  |  | 12 |  | pF | P/N code 12 = 12 pF | 1 |

## CAD (KiCad official)

- Symbol: `ECS-250-12-33-AGN-TR3`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-250-12-33-agn-tr3-etched.step` / `ecs-250-12-33-agn-tr3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-250-12-33-agn-tr3.step` / `ecs-250-12-33-agn-tr3.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590908626246574080) (2 pp, sha256 `7f56a768dd3d4594`, retrieved 2026-10-15, 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-250-12-33-agn-tr3-datasheet.pdf)