L6221 STMicroelectronics, L6221 Datasheet - Page 11

• Manufacturer Part Number: L6221
• Description: QUAD DARLINGTON SWITCH
• Manufacturer: STMicroelectronics

MOUNTING INSTRUCTION
The R
dering the GND pins to a suitable copper area of the
printed circuit board (Fig. 23) or to an external
heatsink (Fig. 24).
The diagram of figure 25 shows the maximum dis-
sipable power P
the side " " of two equal square copper areas hav-
Figure 23 : Example of P.C. Board Copper Area
Figure 25 : Maximum Dissipable Power and Junc-
th j-amb
of the L6221AS can be reduced by sol-
Which is Used as Heatsink
tion to Ambient Thermal Resistance
versus Side " "
tot
and the R
th j-amb
as a function of
ing a thickness of 35
the pins temperature must not exceed 260 C and
the soldering time must not be longer than 12 sec-
onds.
The external heatsink or printed circuit copper area
must be connected to electrical ground.
Figure 24 : External Heatsink Mounting Example
Figure 26 : Maximum Allowable Power Dissipa-
tion versus Ambient Temperature
L6221AS - L6221AD - L6221N
(1.4 mils). During soldering
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