Sencore TF151 - FET Reference Book Section; FET Chart Columns Explained

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4. BASE DIAG

Column

indicates

the

base

diagram

for

that

particular

transistor.

If the

lead

oonfiguration

is

not known,

the

base

diagram

number

listed

in

this

column

should

be

consulted

in

the

back

of the book.

5. GAIN (BETA)

section

is

divided

into

three

sections,

minimum,

average

and

maximum,

showing

the

gain

or

beta

that

should

be

expected

with the

transistor.

The

minimum

and

maximum

figures

are

manufacturers'

limits

.

The

AVE

column

shows

the

average

or

typical

figure

.

All

three

are

listed

when

available

.

Circllit

loading

may

affect

the

indicated

beta

of

the

transistor;

when

a

figure

below

that

listed

is

encountered,

the

transistor

should

be

removed

from

the

circuit

and

rechecked

to

be

sure.

6. LEAKAGE

column

shows

the

maximum

leakage

or

ICBO

of

the

transistor.

Anything

over

this

figure

should

be

considered

bad

and

the

transistor

rejected.

Note:

The

chart

shows

the

maximum

leakage

at

four

volts,

which

is

the

TF151

test

voltage.

111e

manufacturers

published

figure

is

often

given

at

voltages

higher

than

four

volts

.

To

simplify

leakage

testing,

the

published

figure

was

converted

to

that

shown

.

FET

SECTION

OF

REFERENCE

BOOK

The

Field

EffectTransistor

section

of

the

bookis

similar

to the

regular

or

bi-polar

transistor

information.

The

following

section

of the

Field

Effect

Transistor

chart

shown

in

figure

2

shows

how the

chart

can

be

used

to

check

the

FET:

1.

UC807

UC814

UC850

UC851

2.

C

H

A

N

P

P

P

P

3.

B

I

A

S

NORM

NORM

NORM

NORM

4

BASE

DIAG

500

500

500

500

5.

MA

15

1.0

9.0

Figure

2,

s.

MIN.

AVE.

MAX.

2500

25000

800

5000

110

1000

SECTION

OF

FET

CHART

1.

LEAKAGE

IGSS

MAX

uA

.002

.002

.002

.

004

1.

FET

column

lists

the

FET

number

or

manufacturers

number

of

the

device

.

2. CHAN

column

tells

if

the

FET

is

an

N

channel

or

P

channel

transistor

and

the

information

is

used

to

set

the

type

switch

to

the

proper

polarity

of

voltage

in

the

TF1Sl

for

the

tests.

3.

BIAS

column

shows

the BIAS

switch

setting.

NORM

is

for

depletion

type

FETs

that

require

zero

bias,

and

POS

is

for

enhancement

type

FETs,

that

require

positive

bias.

4. BASE DIAG

column

indicates

the

base

diagram

of

the

particular

device

in

question.

If

the

source,

gate,

and

drain

connections

are

not known,

consult

this

drawing

number

in

the

back

of

the

transistor

manual.

7

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