AN668 datasheet(7/19 Pages) STMICROELECTRONICS

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AN668 APPLICATION NOTE

2.3 Miniaturization

The whole story of microelectronics has been a con-

tinuous race towards smaller products. This is also

true for power systems.

The PowerSO-20 and PowerSO-36 offer excellent

possibilities in miniaturization, without compromising

power dissipation.

From Table 2, which compares the PowerSO-20 with

the surface mount version of Multiwatt, advantages in

terms of size, weight, height and volume are evident.

They range between 22 and 64% improvement.

Table 2. Miniaturization of PowerSO-20 vs Sur-

face Mount Multiwatt

2.4 Designed-in surface mount characteris-

tics

A] Handling

The PowerSO-20/36 structure is similar to the

SO outline, which was introduced more than 20

years ago in STMicroelecrtronics. Therefore, the

experience associated with the different aspects

of production, testing, burn-in and on board

mounting are quite solid.

Due to their optimized outline and reduced

weight, handling of the PowerSO-20/36 packag-

es does not present any particular problem and

is fully compatible with existing equipment.

B] Packing

Tube and Tape & Reel packing are both possible

with the PowerSO-20/36. Embossed cavity tape

has been produced with a special design, able to

minimize the mechanical effect of packing and

shipment on the lead coplanarity (Figure 6).

SM MW15L

PowerSO-20

Difference

footprint

(mm2)

320

227

-30%

height

(mm)

4.5

3.5

-22%

volume

(mm3)

1160

590

-49%

weight (gr)

5.6

1.9

-64%

Figure 5. Frame options for high current

D94IN001

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