1998 Feb 09

2

Philips Semiconductors

Product specification

UHF linear push-pull power transistor

BLV57

FEATURES

• internally matched input for wideband operation and

high power gain

• internal midpoint (r.f. ground) reduces negative

feedback and improves power gain

• increased input and output impedances (compared with

single-ended transistors) simplify wideband matching

• length of the external emitter leads is not critical

• diffused emitter ballasting resistors for an optimum

temperature profile

• gold metallization ensures excellent reliability.

DESCRIPTION

Two n-p-n silicon planar epitaxial transistor sections in one

package to be used as push-pull amplifier, primarily

intended for use in linear u.h.f. television transmitters and

transposers.

The package is an 8-lead flange type with a ceramic cap.

All leads are isolated from the flange.

PINNING - SOT161A

PIN

SYMBOL

DESCRIPTION

1

e

emitter

2

e

emitter

3

c2

collector 2

4

b2

base 2

5

c1

collector 1

6

b1

base 1

7

e

emitter

8

e

emitter

Fig.1 Simplified outline and symbol.

handbook, halfpage

MBC826

1

3

5

78

6

4

2

Top view

QUICK REFERENCE DATA

R.F. performance in linear amplifier

Notes

1. Three-tone test method (vision carrier

−8 dB, sound carrier −7 dB, sideband signal −16 dB), zero dB corresponds to

peak sync level.

2. Power gain compression is 1 dB.

MODE OF

OPERATION

MHz

V

A

A

°C

dB

W

W

dB

class-A

860

25

0,85

−

70

25

−60

−55

〉

typ.

6

12

−

〉

typ.

8,0

9,0

class-AB

860

25

1,25

2

× 0,1

25

−−

typ.

WARNING

Product and environmental safety - toxic materials

This product contains beryllium oxide. The product is entirely safe provided that the BeO disc is not damaged.

All persons who handle, use or dispose of this product should be aware of its nature and of the necessary safety

precautions. After use, dispose of as chemical or special waste according to the regulations applying at the location of

the user. It must never be thrown out with the general or domestic waste.