Document Number: 35015

For technical questions contact: frequency@vishay.com

www.vishay.com

Revision: 16-Apr-03

1

Resistance Welded Holder Type Crystal Unit

XT49U

Vishay Dale

FEATURES

• Low cost

• Industry standard

• Excellent aging

• Wide frequency range

• ‘AT’ cut crystal

The XT49U series is an industry standard AT cut crystal

housed in a HC-49U package. It is our standard resistance

weld type quartz crystal.

STANDARD ELECTRICAL SPECIFICATIONS

PARAMETER

SYMBOL

CONDITION

UNIT

MIN

TYPICAL

MAX

Frequency Range

MHz

1.8432

125

Frequency Tolerance

at 25°C

ppm

± 10

± 30

± 50

Temperature Stability

TC

ref to 25°C

ppm

± 10

± 30

± 50

Operating Temperature Range

°C

- 20

+ 70

Storing Temperature Range

°C

- 40

+ 85

Shunt Capacitance

pF

7

Load Capacitance

CL

Customer Specified

pF

10

Series

Insulator Resistance

IR

MΩ

500

Drive Level

DL

µW

100

500

Aging

Fa

at 25°C, per year

ppm

- 5.0

+ 5.0

DIMENSIONS in inches [millimeters]

0.403

[10.24] Max

0.192 0.008 [4.88 ± 0.2]

0.435

[11.05] Max

0.183

[4.65] Max

0.500

[12.7] Min

0.150

[3.80] Max

Ø 0.017 ± 0.002 [0.43 + 0.05]

0.530

[13.46] Max

EQUIVALENT SERIES RESISTANCE (ESR) AND MODE OF VIBRATION (MODE)

FREQUENCY RANGE (MHZ)

MAX ESR (Ω

Ω

Ω

Ω)

MODE

FREQUENCY RANGE (MHZ)

MAX ESR (Ω

Ω

Ω

Ω)

MODE

1.8432 to 1.999

650

Fundamental

6.000 to 7.999

50

Fundamental

2.000 to 2.999

500

Fundamental

8.000 to 12.999

35

Fundamental

3.000 to 3.499

250

Fundamental

13.000 to 32.000

25

Fundamental

3.500 to 3.999

150

Fundamental

24.000 to 29.999

60

4.000 to 4.999

100

Fundamental

30.000 to 79.999

40

5.000 to 5.999

80

Fundamental

80.000 to 125.000

90

ORDERING INFORMATION

XT49U

MODEL

R

OTR

Blank = Standard

R = - 40°C to + 85°C

- 20

LOAD

Blank = Series

- 16 = 16pF

- 20 = 20pF

- 30 = 30pF

- 32 = 32pF

SP

OPTIONS

Blank = Standard

SL = Sleeve

SP = Spacer

4M

FREQUENCY/MHz