mach435 Lattice Semiconductor Corp., mach435 Datasheet - Page 22

• Manufacturer Part Number: mach435
• Description: High-density Ee Cmos Programmable Logic
• Manufacturer: Lattice Semiconductor Corp.

TYPICAL THERMAL CHARACTERISTICS
Measured at 25 C ambient. These parameters are not tested.
22
Parameter
Plastic jc Considerations
The data listed for plastic jc are for reference only and are not recommended for use in calculating junction temperatures. The
heat-flow paths in plastic-encapsulated devices are complex, making the jc measurement relative to a specific location on the
package surface. Tests indicate this measurement reference point is directly below the die-attach area on the bottom center of the
package. Furthermore, jc tests on packages are performed in a constant-temperature bath, keeping the package surface at a
constant temperature. Therefore, the measurements can only be used in a similar environment.
Symbol
jma
ja
jc
Parameter Description
Thermal impedance, junction to case
Thermal impedance, junction to ambient
Thermal impedance, junction to ambient with air flow
MACH435-12/15/20, Q-20/25
200 lfpm air
400 lfpm air
600 lfpm air
800 lfpm air
PLCC
Typ
20
14
12
10
17
5
Unit
C/W
C/W
C/W
C/W
C/W
C/W