Meritek Electronics Corporation | www.meritekusa.com
Rev.7a 12/22/2017
HC-49U Crystal Unit
MXF series
FEATURE
Wide Frequency Range
Resistance Welded
High precision and high frequency stability
Applications: Data Application, Computer Machines, Printers, CPU,
Memory, Test Equipment, Large Pullability Applications
PART NUMBERING SYSTEM
No
Item
Code
Description
Series Reference
(1)
Meritek Series
MXF
Crystal Unit
HC-49U
(2)
Load Capacitance
F
F: 20pF
E: 18pF, R: Series Resonance (see options)
(3)
Frequency Tolerance
H
H: ±30ppm
F: ±20ppm, G: ±25ppm (see options)
(4)
Stability vs Oper Temp.
J
J: ±50ppm
G: ±25ppm, H: ±30ppm (see options)
(5)
Operating Temp.
C
C: -20~+70ºC
C: -20~+70ºC, I: -40~+85ºC (see options)
(6)
Frequency
1M8432
1M8432: 1.8432 MHz
1M8432 ~ 200M0 (M denotes decimal point)
D
IMENSIONS AND RECOMMENDED PATTERN
Item
Size
Item
Size
A
11.5 max.
E
5.0 max.
B
10.3 max.
d
0.457 max.
C
13.46 max.
p
4.88±0.20
D
3.8 max.
L
12.7 min.
(Unit: mm)
AVAILABLE OPTIONS
Parameters
Part Number Options
Load Capacitance
R: Series Resonance, 3: 3pF ~ 8: 8pF,
A: 10pF, B: 12pF, C: 15pF, D: 16pF, E: 18pF, F: 20pF, K: 22pF, G: 25pF, H: 30pF, L: 32pF
Frequency Tolerance
A: ±10ppm, C: ±15ppm, F: ±20ppm, G: ±25ppm, H: ±30ppm, J: ±50ppm
Stability vs Oper Temp.
A: ±10ppm, C: ±15ppm, F: ±20ppm, G: ±25ppm, H: ±30ppm, J: ±50ppm, K: ±100ppm
Operating Temperature
B: 0~+70°C, A: -10~+60°C, C: -20~+70°C, K: -30~+85°C, I: -40~+85°C, R: -40~+105°C
Note: Custom options available. Contact Meritek for more information.
MXF
F
H
J
C
1M8432
(1)
(2)
(3)
(4)
(5)
(6)
Meritek Electronics Corporation | www.meritekusa.com
Rev.7a 12/22/2017
HC-49U Crystal Unit
MXF series
ELECTRICAL CHARACTERISTICS
Parameters
Characteristic
Nominal Frequency Range
1.8432 ~ 200.000 MHz
Operation Mode
Fundamental
1.8432 ~ 40.000 MHz
3
rd
Overtone
40.001 ~ 100.000 MHz
5
th
Overtone
100.001 ~ 150.000 MHz
7
th
Overtone
150.001 ~ 200.000 MHz
Load Capacitance
18.0 pF (see options)
Frequency Tolerance (at 25ºC)
±30 ppm (see options)
Freq Stability over Oper Temp.
±50 ppm (see options)
Operating Temperature
-20 ~ +70°C (see options)
Storage Temperature
-55 ~ +125°C
Drive Level
1 mW max. (100 µW typ.)
Aging
±5 ppm / year
Shunt Capactiance
7.0 pF max.
Insulation Resistance
500 MΩ min. (@100Vdc ±15V)
Drive Level Dependency (DLD)
1 µW ~ 500 µW (min. 7 points tested)
Equivalent Series
Resistance
1.8432 ~ 1.999 Fund.
750 Ω max.
2.0 ~ 2.399 Fundamental
550 Ω max.
2.4 ~ 2.999 Fundamental
350 Ω max.
3.0 ~ 3.699 Fundamental
200 Ω max.
3.7 ~ 4.199 Fundamental
100 Ω max.
4.2 ~ 4.899 Fundamental
70 Ω max.
4.9 ~ 5.999 Fundamental
50 Ω max.
6.0 ~ 7.999 Fundamental
40 Ω max.
8.0 ~ 9.999 Fundamental
35 Ω max.
10.0 ~ 12.499 Fundamental
30 Ω max.
12.5 ~ 40.400 Fundamental
25 Ω max.
40.001 ~ 100.000 3
rd
OT
40 Ω max.
100.001 ~ 150.000 5
th
OT
80 Ω max.
120.001 ~ 200.000 7
th
OT
120 Ω max.
*Specifications subject to change without notice.