September 1992

8

Philips Semiconductors

Product specification

VHF power MOS transistor

BLF225

List of components (class-B test circuit)

Notes

1. American Technical Ceramics (ATC) capacitor, type 100B or other capacitor of the same quality.

2. The striplines are on a double copper-clad printed circuit board, with epoxy fibre-glass dielectric (

COMPONENT

DESCRIPTION

VALUE

DIMENSIONS

CATALOGUE NO.

C1

film dielectric trimmer

4 to 40 pF

2222 809 07008

C2, C10

film dielectric trimmer

5 to 60 pF

2222 809 07011

C3

multilayer ceramic chip capacitor

(note 1)

100 pF, 500 V

C4

ceramic chip capacitor

100 nF, 50 V

2222 852 47104

C5

multilayer ceramic chip capacitor

(note 1)

680 pF, 500 V

C6

electrolytic capacitor

10

µF, 63 V

2222 030 38109

C7

polyester capacitor

100 nF, 250 V

C8

multilayer ceramic chip capacitor

(note 1)

43 pF, 500 V

C9

film dielectric trimmer

7 to 100 pF

2222 809 07015

L1

3 turns enamelled 0.5 mm copper

wire

18 nH

length 3.3 mm

int. dia. 2 mm

leads 2

× 5mm

L2, L3

stripline (note 2)

31

Ω

12

× 6mm

L4

3 turns enamelled 1.5 mm copper

wire

28 nH

length 8.2 mm

int. dia. 4 mm

leads 2

× 5mm

L5

grade 3B Ferroxcube RF choke

4312 020 36642

L6

1 turn enamelled 1.5 mm copper

wire

36 nH

length 4 mm

int. dia. 3.5 mm

leads 2

× 5mm

R1

0.4 W metal film resistor

1 k

Ω

2322 151 51002

R2

0.4 W metal film resistor

1 M

Ω

2322 151 51005

R3

10 turns cermet potentiometer

5 k

Ω

R4

0.4 W metal film resistor

10

Ω

2322 151 51009