# ECS-400-8-33Q-ADS-TR

**ECS** · Crystals · SMD3225-4P

ECS-400-8-33Q-ADS-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 | In/Out | passive | Crystal terminal (pad 1 is electrically interchangeable with pad 3) on the 3.2 x 2.5 mm 4-pad package. |
| 2 | Gnd | power_in | Ground pad; the datasheet lists it as a Gnd connection, and the bottom-pad chamfer has no electrical significance. |
| 3 | Out/In | passive | Crystal terminal (pad 3 is electrically interchangeable with pad 1) on the 3.2 x 2.5 mm 4-pad package. |
| 4 | Gnd | power_in | Ground pad; the datasheet lists it as a Gnd connection, and the bottom-pad chamfer has no electrical significance. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ECS |
| Package | SMD3225-4P |
| 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 tolerance @ +25°C (code A = ±25 ppm) |  | -25 |  | 25 | ppm | @ +25°C; tolerance code A in P/N | 1 |
| Frequency stability (code D = ±100 ppm) |  | -100 |  | 100 | ppm | Stability code D in P/N; printed range -55 ~ +125°C is for DU option | 1 |
| Aging (first year) |  | -5 |  | 5 | ppm | @ +25°C ±3°C, first year | 1 |
| Equivalent series resistance (ESR) max | ESR |  |  | 40 | Ω | Frequency 24.000 ~ 54.000 MHz | 1 |
| Operating temperature (temp range code S) | Topr | -40 |  | 125 | °C | P/N temp range code S = -40 ~ +125°C (from P/N guide; table row for DU option is -55 ~ +125°C) | 1 |
| Storage temperature | Tstg | -55 |  | 125 | °C |  | 1 |
| Frequency range |  | 8 |  | 54 | MHz | Frequency range of ECX-33Q | 1 |
| Shunt capacitance | Co |  |  | 7 | pF |  | 1 |
| Drive level | DL |  |  | 100 | μW |  | 1 |
| Peak solder temperature |  |  |  | 260 | °C | Peak solder temp, 10 sec max, 2 cycles max | 2 |
| Nominal frequency |  |  | 40 |  | MHz | P/N frequency code 400 = 40.000 MHz (developed frequencies table) | 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 POCKET TAPE DIMENSIONS (mm) | 2 |

## CAD (KiCad official)

- Symbol: `ECS-400-8-33Q-ADS-TR`
- Footprint: `Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm`
- 3D model: SMD3225-4P (KiCad packages3D, STEP)
- 3D model files: `ecs-400-8-33q-ads-tr-etched.step` / `ecs-400-8-33q-ads-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ecs-400-8-33q-ads-tr.step` / `ecs-400-8-33q-ads-tr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ECS datasheet](docs/ecs-400-8-33q-ads-tr-datasheet.pdf) (2 pp, sha256 `a6b1a2f2b9a74cec`, retrieved 2026-10-30, 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-400-8-33q-ads-tr-datasheet.pdf)