050-4908 Rev C 7-2003
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)
Source
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.
