BLF248 datasheet(8/13 Pages) PHILIPS

8 / 13 page

September 1992

Philips Semiconductors

Product speciﬁcation

VHF push-pull power MOS transistor

BLF248

List of components (class-AB test circuit)

COMPONENT

DESCRIPTION

VALUE

DIMENSIONS

CATALOGUE NO.

C1, C2

multilayer ceramic chip capacitor

(note 1)

× 56 pF

+ 18 pF in parallel,

500 V

ﬁlm dielectric trimmer

2 to 9 pF

2222 809 09005

multilayer ceramic chip capacitor

(note 1)

47 pF, 500 V

ﬁlm dielectric trimmer

5 to 60 pF

2222 809 08003

C6, C7, C9,

C10, C12, C15,

C31, C34

multilayer ceramic chip capacitor

(note 1)

1 nF, 500 V

C8, C11, C16,

C21, C32

multilayer ceramic chip capacitor

100 nF, 50 V

2222 852 47104

C13, C14, C18,

C19

multilayer ceramic chip capacitor

(note 1)

510 pF, 500 V

C17, C20, C33

electrolytic capacitor

µF, 63 V

C22

multilayer ceramic chip capacitor

(note 1)

82 pF, 500 V

C23

multilayer ceramic chip capacitor

(note 1)

10 pF

+ 30 pF

in parallel, 500 V

C24, C28

ﬁlm dielectric trimmer

2 to 18 pF

2222 809 09006

C25, C26

multilayer ceramic chip capacitor

(note 1)

39 pF

+ 47 pF

in parallel, 500 V

C27

multilayer ceramic chip capacitor

(note 1)

18 pF, 500 V

C29, C30

multilayer ceramic chip capacitor

(note 1)

× 100 pF

in parallel, 500 V

L1, L3, L22, L24

stripline (note 2)

Ω

4.8

× 80 mm

L2, L23

semi-rigid cable (note 3)

Ω

ext. dia. 3.6 mm

ext. conductor

length 80 mm

L4, L5

stripline (note 2)

Ω

× 32.5 mm

L6, L7, L10, L11

stripline (note 2)

Ω

× 10.5 mm

L8, L9

stripline (note 2)

Ω

× 3 mm

L12, L15

grade 3B Ferroxcube wide-band

HF choke

2 in parallel

4312 020 36642

L13, L14

2 turns enamelled 1.6 mm copper

wire

25 nH

int. dia. 5 mm

leads 2

× 7 mm

space 2.5 mm

L16, L17

stripline (notes 2 and 4)

Ω

× 3 mm

L18, L19

stripline (notes 2 and 4)

Ω

× 35 mm

L20, L21

stripline (notes 2 and 4)

Ω

× 9 mm

R1, R6

10 turns potentiometer

50 k

Ω

R2, R5

0.4 W metal ﬁlm resistor

1 k

Ω

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