Product Data Sheet
TC-350 Series Low Profile TCXOs
Features
Frequency from 1 to 77.76 MHz
±1.0 ppm, -40ºC to +85ºC
Low Profile: 3.81 mm (0.15) Ht.
Aging to <5 ppm for Ten Years
3.3 Vdc or 5 Vdc operation
TTL / HCMOS Output
SMC Clock
SONET/SDH Network Timing Sources
Wireless Communications
Satellite Communications
Portable Test Equipment
Vectron International has introduced a series of low
profile surface mount, Temperature Compensated
Crystal Oscillators (TCXOs) 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 TCXOs visit our
website at: www.tcxo.com
Temperature Compensated Crystal Oscillators
TC-350
TCXO
1 to 77.76 MHz
Output:
Temperature Stability:
Frequency vs Supply:
B-507 = ±5.0 x 10-7 over 0ºC to +50ºC
B-106 = ±1.0 x 10-6 over 0ºC to +50ºC
C-507 = ±5.0 x 10-7 over 0ºC to +70ºC
C-106 = ±1.0 x 10-6 over 0ºC to +70ºC
D-757 = ±7.5 x 10-7 over -20ºC to +70ºC
D-156 = ±1.5 x 10-6 over -20ºC to +70ºC
F-106 = ±1.0 x 10-6 over -40ºC to +85ºC
F-206 = ±2.0 x 10-6 over -40ºC to +85ºC
G-156 = ±1.5 x 10-6 over -55ºC to +85ºC
G-256 = ±2.5 x 10-6 over -55ºC to +85ºC
Current: 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.
Supply Voltage (Vdd):
(Other options are available upon request) C = 5.0 Vdc ±5%
D = 3.3 Vdc ±5%
Electrical Frequency Adjust: ±5 ppm minimum via external voltage, 0 to Vdd
<±0.1 ppm for a ±5% change in Supply Voltage
Package: 22.86 x 17.78 x 3.81 mm (0.90 x 0.70 x 0.15)
A = HCMOS / ACMOS
Note: Not all stabilities are
available with all frequency /
Output combinations. Please
consult the factory.
Standard Frequencies: 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
Aging (typical): <5 ppm for ten years @ +70ºC
NOTE: Tighter
stabilities and wider
temperature ranges
are available, please
consult the factory.
B = 10 TTL
Voh min: 0.8 Vdd 2.4 Vdc
Voh max: 0.5 Vdc 0.5 Vdc
Rise/Fall Time: 5 ns max. 10 ns max.
Symmetry (Duty Cycle): 50% ±10% 50% ±10%
Load: 100k ohm // 10 pF 10 TTL
(in.)
.100
.045R
.100
4 places
17.78
( .700)
12.7
( .500)
7.62
( .300)
3.175
( .125)
3.81
( .15)
17.78
( .700)
22.86
( .900)
7.62
( .300)
2.54
( .100)
2.54
( .100)
12
4
3
(in.)
SQ.
pre-heating
60 to 90 sec.
at 150ºC to 170ºC
reflow
20 to 40 sec.
at > 200ºC
Note: TCXOs are precision subsystems with tolerances measured to ±0.01 ppm. Non-Hermetically sealed TCXOs 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 TCXOs has been designed for pick and place reflow soldering. The suggested reflow profile is
shown above. The TCXO may be reflowed 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 before measuring the unit.
OUT
Vdd
.01µF
CL
PROBE
DUT
HCMOS / ACMOS
(A)
RL
R1
6k
Vdd
TTL
(B)
PROBE
OUT
DUT
D1
D2
D3
D4
R2
C1
.01µF
.01µF Vdd
270Ω
Although protection circuitry has been
designed into this device, proper precautions
should be taken to avoid exposure to
electrostatic discharge (ESD) during handling
and mounting. VI employs a human-body
model (HBM) and a charged-device model
(CDM) for ESD-susceptibility testing and
protection design evaluation. ESD voltage
thresholds are dependent on the circuit
parameters used to define the mode.
Although no industry-wide standard has been
adopted for the CDM, a standard HBM
(resistance = 1500 ohms, capacitance =
100pf) is widely used and therefore can be
used for comparison purposes. The HBM
ESD threshold presented here was obtained
by using these circuit parameters.
ESD Threshold Voltage
Model Threshold Unit
Human-Body (HBM)
Charged-Device
500
500
V min
V min
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.
0.95
0.75
0.15
0.15
0.25
4.00
0.25
12 15/16
0.44 0.44
3 x 13 Array / 39 units per tray
VI Logo
0.20 Deep
Pin 1
this corner
TC- 350 - D A G - 256 A - 12.80 MHz
Supply Voltage
C = 5.0 Vdc +/-5%
D = 3.3 Vdc +/-5%
Pin 1 Options
A = Standard, No Options (Default)
Output Frequency
1.0 to 77.76 MHz
Output Type
A = HCMOS / ACMOS
B = 10 TTL
Temperature & Stability
B-507 = ±5.0 x 10-7 over 0ºC to +50ºC
B-106 = ±1.0 x 10-6 over 0ºC to +50ºC
C-507 = ±5.0 x 10-7 over 0ºC to +70ºC
C-106 = ±1.0 x 10-6 over 0ºC to +70ºC
D-757 = ±7.5 x 10-7 over -20ºC to +70ºC
D-156 = ±1.5 x 10-6 over -20ºC to +70ºC
F-106 = ±1.0 x 10-6 over -40ºC to +85ºC
F-206 = ±2.0 x 10-6 over -40ºC to +85ºC
G-156 = ±1.5 x 10-6 over -55ºC to +85ºC
G-256 = ±2.5 x 10-6 over -55ºC to +85ºC
Package
350 = SMT package
Product Family
TC = TCXO
Note: Other
stabilities are
available upon
request
www.vectron.com
