
VS-500A Voltage Controlled SAW Oscillator
Vectron International
267 Lowell Road, Hudson, NH 03051
Tel: 1-88-VECTRON-1 Fax: 1-888-FAX-VECTRON
6
Handling Precautions
Although ESD protection circuitry has been designed into the the VS-500A proper precautions should be taken
when handling and mounting.VI employs a human body model and a charged-device model (CDM) for ESD sus-
ceptibility testing and design protection evaluation. ESD thresholds are dependent on the circuit parameters used
to define the model. Although no industry wide standard has been adopted for the CDM, a standard HBM of resis-
tance = 1.5Kohms and capacitance = 100pF is widely used and therefore can be used for comparison purposes.
Model
Minimum
1500V
1000V
Human Body Model
Charged Device Model
Table 6. ESD Ratings
TIME(s)
T
Figure 5. Suggested IR profile
VI qualification includes aging at various extreme temperatures, shock and vibration, temperature cycling and IR
reflow simulation.The conditions a device can withstand are well understood and devices can be subjected to
the profile in figure 5.This profile shows a ramp up condition to prevent thermal shock, a preheat period in which
the flux is activated, a ramp up to 183°C which is the reflow temperature of Sn/Pb eutectic and a gradual cool
down.The time above 183°C should not exceed 60 seconds and the peak temperature should be no more than
220°C for 10 seconds.The VS-500A’s are 100% screened for hermiticity so an aqueous wash is not an issue.