component
T49SM4MLDBE2X
Public Made by Adomby adom
Yajingxin Crystals, HC-49S-SMD. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownT49SM4MLDBE2X
Yajingxin · Crystals · HC-49S-SMD
T49SM4MLDBE2X from Yajingxin, in a HC-49S-SMD. 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 | 1 | passive | Terminal 1 of a two-terminal crystal; either orientation. |
| 2 | 2 | passive | Terminal 2 of a two-terminal crystal; either orientation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Yajingxin |
| Package | HC-49S-SMD |
| Category | Crystals, Oscillators, Resonators |
| Pins | 2 |
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 at 25℃ (调整频差) | -20 | 20 | ppm | at 25℃ | 2 | ||
| Stability over operation temperature (温度频差) | -30 | 30 | ppm | over operation temperance | 2 | ||
| Shunt Capacitance (Co) (静态电容) | Co | 0 | 7 | pF | 2 | ||
| Operating Temperature Range (工作温度范围) | -20 | 70 | ℃ | 2 | |||
| Storage Temperature Range (储存温度范围) | -35 | 85 | ℃ | 2 | |||
| Nominal Frequency (标称频率) | 4 | MHZ | 2 | ||||
| Load Capacitance (CL) (负载电容) | CL | 20 | pF | 2 | |||
| Drive Level (激励功率) | 100 | uw | 2 | ||||
| Equivalent Resistance (谐振电阻) | 100 | Ω | 2 | ||||
| Insulation Resistance (绝缘电阻) | 500 | MΩ | at DC 100V | 2 | |||
| Aging (老化率) | 3 | ppm/year | 2 | ||||
| Peak/Classification Temperature (Tp) (最高点温度) | 260 | ℃ | Pb-free reflow profile, peak temperature | 3 |
CAD (KiCad official)
- Symbol:
T49SM4MLDBE2X - Footprint:
Crystal:Crystal_SMD_HC49-SD - 3D model: HC-49S-SMD (KiCad packages3D, STEP)
- 3D model files:
t49sm4mldbe2x-etched.step/t49sm4mldbe2x-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);t49sm4mldbe2x.step/t49sm4mldbe2x.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Yajingxin datasheet (5 pp, sha256 ``, retrieved 2026-10-15, tier: lcsc)
- Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins, primarycrystal numbering(convention), consensusoff(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).