ECX-306/306I
SMD TUNING FORK CRYSTAL
Housing for the ECX-306/306I crystal is
made from the same thermoplastic that
is industry standard for integrated cir-
cuits. This ruggedized molded package
is excellent for SMD applications.
FEATURES
• Low profile
• Long term stability
• Industry standard footprint
• Excellent shock resistance
• Excellent environmental characteristics
• Tape and Reel (3,000 pcs)
PART NUMBERING GUIDE
“EXAMPLE”
ECS
–
FREQUENCY
.327
–
LOAD CAPACITANCE
12.5
–
PACKAGE TYPE**
17
** Package Type examples (-17= ECX-306, 17
I
= ECX-306
I
)
OPERATING CONDITIONS/ELECTRICAL CHARACTERISTICS
PARAMETERS
NOMINAL FREQUENCY
LOAD CAPACITANCE
DRIVE LEVEL
CALIBRATION TOLERANCE
EQUIVALENT SERIES RESISTANCE
TEMPERATURE COEFFICIENT
OPERATING TEMPERATURE RANGE
MAX. OPERATING TEMPERATURE RANGE
Q FACTOR
TURNOVER TEMPERATURE
STORAGE TEMPERATURE RANGE
INSULATION RESISTANCE
SHUNT CAPACITANCE
MOTIONAL CAPACITANCE
AGING (FIRST YEAR)
Fo
C
L
D
L
@ 25˚C
R
1
T
OPR
Q
T
O
T
STG
IR
C
o
C
1
∆f/fo
ECX-306/306
I
32.768
12.5 Standard (6.0 Optional)
1 max.
±20
50 max.
-0.040 PPM/˚C
2
max.
-10 ~ +60
-40 ~ +85
50,000 min.
+25 ± 5
-55 ~ +125
500M
Ω
min./ DC 100V
1.35 typical
0.003 pF typical
±3 PPM max. @ +25˚C
UNITS
KHz
pF
µW
PPM
KΩ
PPM/(∆C˚)
˚C
°C
°C
°C
MΩ
pF
pF
PPM
PARABOLIC TEMPERATURE CURVE
T (˚C)
-20 -10
0
10
20 30 40 50
-10
60
70
PACKAGE DIMENSIONS (mm)
8.0 Max.
#4
#3
#4
#3
8.7 Max.
#4
#3
#4
#3
-20
-30
3.8 Max.
3.7 Max.
-40
-50
-60
#1
5.5
#2
#1
#2
#1
5.5
#2
#1
#2
f/f (PPM)
2.5 Max.
0.5
0.5
(0.9
Typ
ica
l)
2.5 Max.
To determine frequency stability, use parabolic
curvature. For example: What is the stability at 45˚C?
1) Change in T (˚C) = 45 -25 = 20˚C
2
2) Change in frequency = -0.04 PPM x (
∆
T)
2
= -0.04 PPM x (20)
= -16.0 PPM
0.5
0.5
1.15
Figure 1) ECX-306 - Top, Side and End views
with pin connections
Figure 2) ECX-306
I
- Top, Side and End views
with pin connections
RECOMMENDED OSCILLATION
CIRCUIT
Rf
Rd
1.9
1.3
C
1
C
2
In this circuit, low
drive level with a
maximum of 1µW
is recommended.
If excessive drive
is applied, irregu-
lar oscillation or
quartz element
fractures may
occur.
1.9
1.3
4.2
1.3
Figure 3) ECX-306/306
I
Land Pattern - Top view
ELECTRICAL CHARACTERISTICS
IC: TC 4069P, Rf: 10MΩ
Rd: 330KΩ (As required)
C
1
= 22pF, C
2
= 22pF, V
DD
= 3.0V
ECS, INC. INTERNATIONAL
1105 S. RIDGEVIEW, OLATHE, KS 66062 • 913-782-7787 • 800-237-1041 • FAX 913-782-6991 • WWW.ECSXTAL.COM
SMD CRYSTALS
13
SMD CRYSTALS
ECS [ ECS, INC. ]
