MURP20040CT

4

Motorola Ultrafast Power Rectifier Data

MAXIMUM MECHANICAL RATINGS

Terminal Penetration:

0.235 max

Terminal Torque:

70 in-lb max

Mounting Torque —

Outside Holes:

70 in-lb max

Mounting Torque —

Center Hole:

8–10 in-lb max

Seating Plane

1 mil per in.

Flatness

(between mounting holes)

POWERTAP MECHANICAL DATA

APPLIES OVER OPERATING TEMPERATURE

Vertical Pull

250 lbs. max

2 in. Lever Pull

50 lbs. max

Note: While the POWERTAP is capable of sustaining these vertical and levered tensions, the intimate contact

2

″

MOUNTING PROCEDURE

The POWERTAP package requires special mounting considerations because of the long longitudinal axis of the copper heat

sink. It is important to follow the proper tightening sequence to avoid warping the heat sink, which can reduce thermal contact

between the POWERTAP and heat sink.

2 – 3 TURNS

2 – 3 TURNS

2 – 3 TURNS

POWER

TAP

HEAT

SINK

STEP 2:

Finger tighten the center bolt. The bolt may

catch on the threads of the heat sink so it is im-

portant to make sure the face of the bolt or

washer is in contact with the surface of the

POWERTAP.

2 – 3 TURNS

FINGER-TIGHT

2 – 3 TURNS

POWER

TAP

HEAT

SINK

STEP 3:

Tighten each of the end bolts between 5 to 10

in-lb.

POWER

TAP

HEAT

SINK

5 – 10 IN-LB

FINGER-TIGHT

5 – 10 IN-LB

STEP 4:

Tighten the center bolt between 8 to 10 in-lb.

5 – 10 IN-LB

8 – 10 IN-LB

5 – 10 IN-LB

POWER

TAP

HEAT

SINK

STEP 5:

Finally, tighten the end bolts to 70 in-lb.

70 IN-LB

8 – 10 IN-LB

70 IN-LB

POWER

TAP

HEAT

SINK

STEP 1:

Locate the POWERTAP on the heat sink and

start mounting bolts into the threads by hand

(2 or 3 turns).