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ECS, INC. INTERNATIONAL 1105 S. RIDGEVIEW, OLATHE, KS 66062 • 913-782-7787 • 800-237-1041 • FAX 913-782-6991 • WWW.ECSXTAL.COM

CRYSTALS

CRYSTALS

The ECS-31 Series features the same

characteristics as only tuning fork crystals

offer. Because of their miniature size they are

ideal for portable and communication

equipment applications.

FEATURES

• Miniature size

• Cost effective

• Long term stability

• Excellent shock and vibration characteristics

LOW FREQUENCY QUARTZ CRYSTALS

OPERATING CONDITIONS/ELECTRICAL CHARACTERISTICS

PARAMETERS

3X8

2X6

1X5

CONDITIONS

FREQUENCY RANGE

20KHz ~ 40KHz

30KHz ~ 150KHz

200KHz

KHz

FREQUENCY TOLERANCE

±30 PPM

±30 PPM

±10,000 PPM

@ +25˚C

FREQUENCY VS. TEMP. CHARAC.

See Drawing

-10˚C ~ +60˚C

TURNOVER TEMPERATURE

Tm

+25˚C typ.

TEMPERATURE COEFFICIENT

ß

-0.034 PPM/˚C

Varies depending on frequency

OPERATING TEMP. RANGE

-10 ~ +60

˚C

STORAGE TEMP. RANGE

-40 ~ +85

˚C

EQUIVALENT SERIES RESISTANCE

30 ~ 50 (max.)

10 (max.)

K

Ω

LOAD CAPACITANCE

12.5pF typ. (Customer Specified)

pF

MOTIONAL CAPACITANCE

1 ~ 4fF typ.

fF

SHUNT CAPACITANCE

0.8 ~ 1.7pF typ.

pF

CAPACITANCE RATIO

τ

425 ~ 800 typ.

DRIVE LEVEL

DL

1µW max.

µW

INSULATION RESISTANCE

IR

500 M

Ω min.

DC 100V±15

±5 PPM max.

+25˚C ± 3˚C

±5 PPM max.

Conditions will vary

SHOCK RESISTANCE

Drop test of 3 times on a hard board from 75 cm height or shock test of 3000G x 0.3ms x 1/2 sin wave x 3 directions

depending on frequency

MANUFACTURER

FREQUENCY

LOAD CAPACITANCE

PACKAGE TYPE*

ECS

–

.400

–

12.5

–

8

ECS

–

.400

–

12.5

–

13

ECS

–

2.0

–

12.5

–

14

8.2 Max.

10

PACKAGE DIMENSIONS (mm)

Figure 1) ECS-31-8

6.2 Max.

10

Figure 2) ECS-31-13

5.1 Max.

4.3

Figure 3) ECS-31-14

* Package type examples (8=3x8, 13=2x6, 14=1x5)

PARABOLIC TEMPERATURE CURVE

-20

-10

-20

-30

-40

-50

-60

-10

0

10

20

30

40 50

60

70

f/f (PPM)

T (˚C)

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) Change in frequency = -0.04 PPM x (

∆T)

2

= -0.04 PPM x (20)

2

= -16.0 PPM