1998 Jan 21

8

Philips Semiconductors

Product specification

UHF power MOS transistor

BLF544

List of components (see Figs 11 and 12).

Notes

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

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

3. The striplines are on a double copper-clad printed circuit board, with glass microfibre reinforced PTFE (

COMPONENT

DESCRIPTION

VALUE

DIMENSIONS

CATALOGUE NO.

C1, C6, C11, C17

multilayer ceramic chip capacitor;

note 1

390 pF; 500 V

C2

multilayer ceramic chip capacitor;

note 2

16 pF; 50 V

C3, C5

film dielectric trimmer

2 to 9 pF

2222 809 09002

C4

multilayer ceramic chip capacitor;

note 2

27 pF; 50 V

C7

multilayer ceramic chip capacitor

2

× 100 nF in

parallel; 50 V

2222 852 47104

C8, C9

multilayer ceramic chip capacitor;

note 2

39 pF

C10, C12

multilayer ceramic chip capacitor

100 nF; 50 V

2222 852 47104

C13

electrolytic capacitor

4.7

µF; 63 V

2222 030 38478

C14

multilayer ceramic chip capacitor;

note 1

20 pF; 500 V

C15, C16

film dielectric trimmer

2 to 18 pF

2222 809 09003

L1

stripline note 3

50

Ω

9.5

× 2.5 mm

L2

stripline note 3

50

Ω

34.5

× 2.5 mm

L3

stripline note 3

50

Ω

17.5

× 2.5 mm

L4, L5

stripline note 3

42

Ω

3

× 3mm

L6

4 turns enamelled 0.8 mm copper

wire

31 nH

length 7.5 mm

int. dia. 3 mm

leads 2

× 5mm

L7

grade 3B Ferroxcube RF choke

4312 020 36642

L8

stripline note 3

50

Ω

22

× 2.5 mm

L9

stripline note 3

50

Ω

39.5

× 2.5 mm

R1, R2

0.4 W metal film resistor

1 k

Ω

2322 151 11002

R3

10 turns cermet potentiometer

50 k

Ω

R4

0.4 W metal film resistor

140 k

Ω

2322 151 11404

R5

1 W metal film resistor

10

Ω

2322 153 51009