J
Joerg
- Jan 1, 1970
- 0
Hello Folks,
Does anyone know a manufacturer that provides a wee bit more info in
datasheets for their TVS?
The issue:
We have SMAJ78CA in a board because long cables, filters and such can
cause nasty ringing. The board must tolerate several 100msec bursts of
80V amplitude in a row, but only on rare occasions and then such a burst
is a one-time event. Long story short, these things won't clamp well
before 100V is reached in the ringing and then some stuff with 100V abs
max ratings can go phhhhut.
Unfortunately min-max breakdown voltage for such TVS is only spec'd at
1mA which isn't helpful. If there was a spec for, say 20mA, that would
be different. I have inquired but not much hope. Does anyone know a mfg
that specs also at higher currents? Must be in the tables and not just
typical graphs because this product goes into a safety-critical and thus
regulated market.
Tried a few SPICE models such as the ".SUBCKT 1smb70at3g" from:
http://www.onsemi.com/pub/Collateral/1SMA70AT3G.LIB
But they all seem a bit on the primitive side, either a simple diode
model or piecewise linear, and also no min-max.
Does anyone know a manufacturer that provides a wee bit more info in
datasheets for their TVS?
The issue:
We have SMAJ78CA in a board because long cables, filters and such can
cause nasty ringing. The board must tolerate several 100msec bursts of
80V amplitude in a row, but only on rare occasions and then such a burst
is a one-time event. Long story short, these things won't clamp well
before 100V is reached in the ringing and then some stuff with 100V abs
max ratings can go phhhhut.
Unfortunately min-max breakdown voltage for such TVS is only spec'd at
1mA which isn't helpful. If there was a spec for, say 20mA, that would
be different. I have inquired but not much hope. Does anyone know a mfg
that specs also at higher currents? Must be in the tables and not just
typical graphs because this product goes into a safety-critical and thus
regulated market.
Tried a few SPICE models such as the ".SUBCKT 1smb70at3g" from:
http://www.onsemi.com/pub/Collateral/1SMA70AT3G.LIB
But they all seem a bit on the primitive side, either a simple diode
model or piecewise linear, and also no min-max.