Product Data Sheet
TC-350 Series Low Profile TCXO’s
Temperature Compensated Crystal Oscillators
Features
•
•
•
•
•
•
Frequency from 1 to 77.76 MHz
±1.0 ppm, -40°C to +85°C
Low Profile: 3.81 mm (0.15”) Ht.
Aging <5 ppm for Ten Years
3.3 Vdc or 5 Vdc operation
TTL/HCMOS Output
Applications
•
•
•
•
•
SMC Clock
SONET/SDH Network Timing Sources
Wireless Communications
Satellite Communications
Portable Test Equipment
Description
Vectron International has introduced a series of low profile
surface mount, Temperature Compensated Crystal
Oscillators (TCXO’s) available in frequencies from 1 to 77.76
MHz.
The TC-350 series surface mount TCXO can be mounted
using the standard convection reflow process. Current drain
to less than 5 mA is available upon request. Aging <5 ppm
for ten years.
For additional information about TCXO’s visit our website at:
www.tcxo.com
TC-350 Series Low Profile TCXO’s
Performance Characteristics
Parameter
Characteristics
Standard Frequencies:
Package:
Supply Voltage (Vdd):
(Other options are available upon request)
10.00, 12.80, 13.00, 16.384, 19.44, 20.00, 20.48, 27.00 MHz
Available from 1.0 MHz to 77.76 MHz
22.86 x 17.78 x 3.81 mm (0.90” x 0.70” x 0.15”)
C
= 5.0 Vdc ±5%
D
= 3.3 Vdc ±5%
Current draw will vary greatly depending on frequency and output
type. For this series TCXO typical current draw will be about 10 mA.
Please consult the factory about your exact current requirements.
A
= HCMOS/ACMOS
0.8 Vdd
0.5 Vdc
5 ns max.
50% ±10%
100k ohm // 10 pF
B-507
=
±5.0 x 10
-7
B-106
=
±1.0 x 10
-6
C-507
=
±5.0 x 10
-7
C-106
=
±1.0 x 10
-6
D-757
=
±7.5 x 10
-7
D-156
=
±1.5 x 10
-6
F-106
=
±1.0 x 10
-6
F-206
=
±2.0 x 10
-6
G-156
=
±1.5 x 10
-6
G-256
=
±2.5 x 10
-6
over
over
over
over
over
over
over
over
over
over
Current:
Output:
Voh min.
Voh max.
Rise/Fall Time:
Symmetry (Duty Cycle):
Load:
Temperature Stability:
B
= 10 TTL
2.4 Vdc
0.5 Vdc
10 ns max.
50% ±10%
10 TTL
0°C to +50°C
0°C to +50°C
0°C to +70°C
0°C to +70°C
-20°C to +70°C
-20°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +85°C
-55°C to +85°C
NOTE: Tighter
stabilities and
wider temperature
ranges are avail-
able, please con-
sult the
factory.
Aging (typical):
Frequency vs. Supply:
Electrical Frequency Adjust:
<5 ppm for ten years @ +70°C
<±0.1 ppm for a ±5% change in Supply Voltage
±5 ppm minimum via external voltage, 0 to Vdd
Vectron International •
267 Lowell Road, Hudson, NH 03051
• Tel: 1-88-VECTRON-1 • Web: www.vectron.com
2
TC-350 Series Low Profile TCXO’s
Outlline Drawing
2.54
( .100)
1
2
22.86
( .900)
17.78
( .700)
4
7.62
( .300)
3
3.81
( .15)
.100
2.54
( .100)
mm
'# )
(in)
.045R
.100
4 places
Pin
I
2
3
4
Function
Output
Freq. Adj.
GND
Supply
Recommended Pad Layout
3.175 SQ
(.125)
7.62
(.300)
Pad Layout
for 350 Package
17.78
(.700)
12.7
(.500)
mm
'# )
(in)
Vectron International •
267 Lowell Road, Hudson, NH 03051
• Tel: 1-88-VECTRON-1 • Web: www.vectron.com
3
TC-350 Series Low Profile TCXO’s
Recommended Reflow Profile
pre-heating
60 to 90 sec.
at 150°C to 170°C
reflow
20 to 40 sec.
at > 200°C
Note: TCXO’s are precision subsystems with tolerances measured to 0.01 ppm. Non-
Hermetically sealed TCXO’s should not be subjected to a wash process that will immerse the
TCXO in solvents. NO CLEAN is the recommended procedure. The TC-350 series of TCXO’s has
been designed for pick and place reflow soldering. The suggested reflow profile is shown above.
The TCXO may be relfowed one time in the non-inverted state. Typical frequency shift as a result
of reflow is <1.0 ppm per reflow. VI recommends waiting at least two hours after reflow below
measuring the unit.
Output Loads
Vdd
Vdd
.01µF
.01µF
PROBE
DUT
OUT
D1
R2
270Ω
D2
D3
D4
PROBE
Vdd
DUT
OUT
RL
CL
R1
6k
C1
.01µF
(A) HCMOS / ACMOS
(B) TTL
Vectron International •
267 Lowell Road, Hudson, NH 03051
• Tel: 1-88-VECTRON-1 • Web: www.vectron.com
4
TC-350 Series Low Profile TCXO’s
Standard Shipping Method
The Standard ship method for volume production of the TC-350 series is in a matrix
tray. These trays are 100% recyclable. The trays also offer the added feature that they
can be continuously feed into a pick-n-place machine eliminating the down time
required with tape-n-reel.
12 15/16
0.44
0.44
0.20 Deep
VI Logo
0.25
4.00
0.15
0.95
0.25
0.15
0.75
3 x 13 Array / 39 units per tray
Pin 1
this corner
Handling Precautions
Although protection circuitry has been designed into
this device, proper precautions should be taken to avoid
exposure to electrostatic discharge (ESD) during han-
dling and mounting. VI employs a human-body model
*HBM) and a charged-device model (CDM) for ESD-sus-
ceptibility testing and protection design evaluation. ESD
voltage thresholds are depending on the circuit parame-
ters used to define the mode.
Although no industry-wide standard has been adopt-
ed for the CDM, a standard HBM (resistance =1500
ohms, capacitance - 1000 pf) is widely used and therefore
can be used for comparison purposes. The HBM ESD
threshold presented here was obtained by using these cir-
cuit parameters.
ESD Threshold Voltage
Model
Human-Body (HBM)
Charged-Device
Threshold
500
500
Unit
V min
V min
Vectron International •
267 Lowell Road, Hudson, NH 03051
• Tel: 1-88-VECTRON-1 • Web: www.vectron.com
5
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