PIN 1 - DRAIN

PIN 2 - SOURCE

PIN 3 - SOURCE

PIN 4 - GATE

1.000

.500

.150r

.500

.466

.750

1.500

1.250

.300

.200

.250

.250

.005 .040

.125d

1

2

4

3

D

S

G

Microsemi’s products are covered by one or more of U.S. patents 4,895,810 5,045,903 5,089,434 5,182,234 5,019,522 5,262,336 6,503,786 5,256,583

4,748,103 5,283,202 5,231,474 5,434,095 5,528,058 6,939,743, 7,352,045 5,283,201 5,801,417 5,648,283 7,196,634 6,664,594 7,157,886 6,939,743 7,342,262

and foreign patents. US and Foreign patents pending. All Rights Reserved.

HAZARDOUS MATERIAL WARNING

The ceramic portion of the device between leads and

mounting flange is beryllium oxide. Beryllium oxide dust

is highly toxic when inhaled. Care must be taken during

handling and mounting to avoid damage to this area.

These devices must never be thrown away with general

industrial or domestic waste.

Thermal

Considerations

and

Package

Mounting:

The rated 1350W power dissipation is only available

when the package mounting surface is at 25°C and

the junction temperature is 200°C. The thermal resis-

tance between junctions and case mounting surface

is 0.13°C/W. When installed, an additional thermal

impedance of 0.09°C/W between the package base

and the mounting surface is smooth and flat. Thermal

joint compound must be used to reduce the effects of

small surface irregularities. The heatsink should incor-

porate a copper heat spreader to obtain best results.

The lid maintains the required mounting pressure while

allowing for thermal expansion of both the device and

the heat sink. Four 6-32 (M3.5) screws provide the

minimum 125 lb. required mounting force. T=4-6 in-lb.

Please refer to App Note 1802 "Mounting Instructions

for Flangeless Packages."

VRF157FL(MP)

Adding MP at the end of P/N specifies a matched pair where V

are marked on the devices per the following table.

Code

Vth Range

Code 2

Vth Range

A

2.900 - 2.975

M

3.650 - 3.725

B

2.975 - 3.050

N

3.725 - 3.800

C

3.050 - 3.125

P

3.800 - 3.875

D

3.125 - 3.200

R

3.875 - 3.950

E

3.200 - 3.275

S

3.950 - 4.025

F

3.275 - 3.350

T

4.025 - 4.100

G

3.350 - 3.425

W

4.100 - 4.175

H

3.425 - 3.500

X

4.175 - 4.250

J

3.500 - 3.575

Y

4.250 - 4.325

K

3.575 - 3.650

Z

4.325 - 4.400

V