November 1992

8

Philips Semiconductors

Product specification

UHF power MOS transistor

BLF521

List of components (class-AB test circuit)

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 PTFE fibre-glass dielectric (

thickness 1.6 mm.

COMPONENT

DESCRIPTION

VALUE

DIMENSIONS

CATALOGUE NO.

C1, C5, C8, C15

multilayer ceramic chip capacitor

(note 1)

390 pF, 500 V

C2, C13

film dielectric trimmer

2 to 9 pF

2222 809 09002

C3

multilayer ceramic chip capacitor

(note 2)

5.6 pF, 500 V

C4

film dielectric trimmer

2 to 18 pF

2222 809 09003

C6, C11

multilayer ceramic chip capacitor

2

× 100 nF in

parallel, 50 V

2222 852 47104

C7, C9

multilayer ceramic chip capacitor

100 nF, 50 V

2222 852 47104

C10

electrolytic capacitor

10

µF, 63 V

2222 030 38109

C12

multilayer ceramic chip capacitor

(note 2)

9.1 pF, 50 V

C14

film dielectric trimmer

1.4 to 5.5 pF

2222 809 09001

L1

stripline (note 3)

83

Ω

20

× 2mm

L2

stripline (note 3)

83

Ω

21

× 2mm

L3

stripline (note 3)

83

Ω

19

× 2mm

L4, L5

stripline (note 3)

67

Ω

12

× 3mm

L6

5 turns enamelled 0.5 mm copper

wire

62 nH

length 3.75 mm

int. dia. 3 mm

leads 2

× 4mm

L7

grade 3B Ferroxcube RF choke

4312 020 36642

L8

stripline (note 3)

83

Ω

18.6

× 2mm

L9

stripline (note 3)

83

Ω

31.6

× 2mm

L10

stripline (note 3)

83

Ω

2

× 2mm

R1

0.4 W metal film resistor

274

Ω

2322 151 72741

R2

0.4 W metal film resistor

1.96 k

Ω

2322 151 71962

R3

0.4 W metal film resistor

1 M

Ω

2322 151 71005

R4

cermet potentiometer

5 k

Ω

R5

0.4 W metal film resistor

7.5 k

Ω

2322 151 77502

R6

1 W metal film resistor

10

Ω

2322 153 51009