ECS-80-20-4X

Crystal, HC-49USX Series, 8 MHz, 30 ppm, 50 ppm, 20 pF

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Manufacturer: ECS INC INTERNATIONAL
Product type: Crystals
SVHC: No SVHC (04-Feb-2026)
Frequency Nom: 8MHz
Product Range: 0
Load Capacitance: 20pF
Crystal Frequency: 8MHz
Crystal Case / Package: Through Hole, 11.35mm x 4.65mm
Frequency Stability + / -: 50ppm
Frequency Tolerance + / -: 30ppm
Operating Temperature Max: 70°C
Operating Temperature Min: -10°C

Delivery and price
Units per pack	500
Price	0.307 €
Current stock	200+
Lead time	30 days

Datasheet

RoHS The HC-49USX is the low profile resistance weld type Thru Hole COMPLIANT quartz crystal. 

## **HC-49USX QUARTZ CRYSTAL** 

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HC-49USX QUARTZ CRYSTAL<br>**----- End of picture text -----**<br>


- Cost Effective 

- Low Profile 

- Pb Free/RoHS Compliant 

- MSL 1 

## **OPERATING CONDITIONS / ELECTRICAL CHARACTERISTICS** 

|**PARAMETERS**|**CONDITIONS**|**HC-49USX**|**HC-49USX**|**HC-49USX**|**UNITS**|
|---|---|---|---|---|---|
||~~ee~~|**MIN**|**TYP**|**MAX**||
|Frequency<br>~~ee~~|Fo<br>~~ee~~<br>~~ee~~|3.570<br>~~ee~~|~~ee~~|70.000<br>~~ee~~|MHz<br>~~ee~~|
|Frequency Tolerance*<br>~~es~~|@ +25°C<br>~~ee~~<br>~~ee~~|~~es~~||± 30|ppm|
|Frequency Stability*<br>~~es~~|-10 ~ +70°C<br>~~ee~~<br>~~ee~~|~~es~~||± 50|ppm|
|Shunt Capacitance<br>~~es ~~|Co<br>~~ee~~<br> ~~ee~~|~~es~~||7|pF|
|Load Capacitance|Specify in P/N<br>~~ee~~|10|20|Series|pF|
|Drive Level|DL|||500|μW|
|Operating Temperature*|Topr|-10||+70|°C|
|Storage Temperature|Tstg|-55||+125|°C|
|Aging (First Year)|@ +25°C ±3°C|||±5|ppm|



## **DIMENSIONS (mm)** 

|**Frequency (MHz)         ESR Ω Max.**|**Frequency (MHz)         ESR Ω Max.**|**Mode of Osc.**|
|---|---|---|
|3.570 ~ 3.999|200|Fundamental|
|4.000 ~ 4.999|150|Fundamental|
|5.000 ~ 5.999|120|Fundamental|
|6.000 ~ 6.999|100|Fundamental|
|7.000 ~ 8.999|80|Fundamental|
|9.000 ~ 12.999|60|Fundamental|
|13.000 ~ 19.999|40|Fundamental|
|20.000 ~ 30.000|30|Fundamental|
|27.000 ~ 70.000|100|3rdOvertone|



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Figure 2)  HC-49USX (-4X-3IL) 3 [rd]  In Line Lead<br>Base, Side, and End View<br>**----- End of picture text -----**<br>


_**Figure 1)** Side and Bottom_ 

## **PART NUMBERING GUIDE:  Example ECS-200-20-4X** 

|**ECS -  FREQUENCY ABBREVIATION**|**ECS -  FREQUENCY ABBREVIATION**|**ECS -  FREQUENCY ABBREVIATION**|**LOAD**||||**PACKAGE**||||||**AVAILABLE OPTIONS**|**AVAILABLE OPTIONS**|**AVAILABLE OPTIONS**||**PACKAGING**|**PACKAGING**|**PACKAGING**||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
||||**CAPACITANCE**||||||||Tolerance           Stability                 Temp Range|||Tolerance           Stability                 Temp Range|Tolerance           Stability                 Temp Range|Tolerance           Stability                 Temp Range|Tolerance           Stability                 Temp Range||||
||||||||||||||||||||||
|200 = 20.000 MHz<br>ECS|||20 = 20 pF||4X = 3.5 mm||4X = 3.5 mm||Blank = Std||||Blank= Std||Blank= Std||||Bulk||
|See P/N Guide|||S = Series||4LX = 2.5 mm<br>4X-3IL = 3rd<br>In Line Lead Base||||A = ± 25ppm<br>J = ± 20ppm<br>R = ± 15ppm<br>C = ± 10ppm||||D= ±100 ppm<br>E = ± 50 ppm<br>G = ± 30 ppm<br>H = ± 25 ppm||L =   -10 ~ +70°C<br>M = -20 ~ +70°C<br>Y  =  -30 ~ +85°C<br>N =  -40 ~ +85°C||||||
|* Specify available options in P/N.<br>† Contact ECS for availability over extended temp range.|||||||||||||T = ± 20 ppm †<br>W = ±15 ppm †<br>K = ± 10 ppm †||P =  -40 ~ +105°C<br>S =  -40 ~ +125°C<br>U =  -55 ~ +125°C||||Rev.2017||



- Specify available options in P/N. 

† Contact ECS for availability over extended temp range. 

## R [4 S **HC-49USX** O coma **QUARTZ CRYSTAL** 

|**DEVELOPED FREQUENCIES**|**DEVELOPED FREQUENCIES**|||
|---|---|---|---|
|Abbreviation|Frequency<br>(MHZ)|Abbreviation|Frequency<br>(MHZ)|
|035|3.579545|120|12.000|
|036|3.6864|122.8|12.288|
|040|4.000|129.6|12.960|
|040.3|4.032|135|13.5168|
|041|4.096|143|14.31818|
|042|4.194034|147.4|14.7456|
|044|4.433618|150|15.000|
|049|4.9152|153|15.360|
|050|5.000|160|16.000|
|051|5.0688|163.8|16.384|
|060|6.000|177.3|17.734475|
|061|6.144|180|18.000|
|065|6.500|184|18.432|
|073|7.3728|196.6|19.6608|
|076.8|7.680|200|20.000|
|080|8.000|220|22.000|
|085|8.500|221|22.1184|
|090|9.000|240|24.000|
|092.1|9.216|245.7|24.576|
|098.3<br>~~ee~~|9.8304|250|25.000|
|100<br>~~ee~~<br>~~Re~~|10.000<br>~~Re~~<br>~~es~~|270<br>~~Re~~<br>~~es~~|27.000<br>~~Re~~|
|102.4<br> ~~ee~~<br>~~Re~~|10.240<br>~~Re~~<br>~~es~~|282.24<br>~~Re~~<br>~~es~~|28.224<br>~~Re~~|
|107.3|10.738635<br>~~es ~~<br>~~es~~|286.3<br> ~~es~~<br>~~es~~|28.63636|
|110<br>~~Re~~|11.000<br>~~Re~~<br>~~es~~|320<br>~~Re~~<br>~~es~~|32.000<br>~~Re~~|
|110.5<br>~~Re~~|11.0592<br>~~Re~~<br>~~es ~~|400<br>~~Re~~<br> ~~es~~|40.000<br>~~Re~~|
|115.2|11.520|480|48.000|
|119.8|11.98135|500|50.000|



|Peak solder Tem|**SOLDER PROFILE**<br>Peak solder Temp+260°C Max 10 sec Max.<br>2 Cycles Max.<br>MSL 1,Lead Finish Sn/Cu Matte|
|---|---|



_**Figure 1)** Suggested Solder Profile_

Updated at June 5, 2026

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