15.49 (.610)

16.26 (.640)

5.38 (.212)

6.20 (.244)

6.15 (.242) BSC

4.50 (.177) Max.

19.81 (.780)

20.32 (.800)

20.80 (.819)

21.46 (.845)

1.65 (.065)

2.13 (.084)

1.01 (.040)

1.40 (.055)

5.45 (.215) BSC

3.55 (.138)

3.81 (.150)

2.87 (.113)

3.12 (.123)

4.69 (.185)

5.31 (.209)

1.49 (.059)

2.49 (.098)

2.21 (.087)

2.59 (.102)

0.40 (.016)

0.79 (.031)

2-Plcs.

Top View

ARF448A

Device

ARF448B

Gate

Drain

Source

Source

Drain

Gate

Dimensions in Millimeters and (Inches)

NOTE: The ARF446 and ARF447 comprise a symmetric

pair of RF power transistors and meet the same electrical

specifications. The device pin-outs are the mirror image

of each other to allow ease of use as a push-pull pair.

L1

C2

T1

R1

DUT

L2

L3

C3

C4

C6

C7

C5

L4

150V

+

-

RF Output

RF Input

C1 -- 1800pF 100V chip

C2-C4 -- Arco 463 Mica Trimmer

C5-C7 -- 1nF 500V COG chip

L1 -- 1" #16 AWG into hairpin ~9.6nH

L2 -- 6t #16 AWG .25" ID ~165nH

L3 -- 10t #18 AWG .25" ID ~0.47µH

L4 -- VK200-4B ferrite choke ~3µH

R1 -- 25 Ohm 1/2W Carbon

T1 -- 9:1 Broadband Transformer

40.48 MHz Test Circuit

C1

Parts List

TO-247 Package Outline

ARF448A/448B

40.68 MHz Test Circuit

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