General Semiconductor AS4028, AS4024 Datasheet

AVALANCHE ALTERNATOR RECTIFIER AS4024 AND AS4028

PASSIVATED ANISOTROPIC RECTIFIER TECHNOLOGY

Mean Breakdown Voltage - 24 and 28 volts Peak Pulse Current - 80 Amperes

FEATURES

¨ Plastic package has Underwriters Laboratory

Flammability Classification 94V-0

¨ High temperature stability due to unique oxide

passivation

¨ Patented Passivated Anisotropic Rectifier

(PAR) construction

¨ Integrally molded heatsink provides

a very low thermal resistance for
maximum heat dissipation

¨ Low leakage current at TJ=175¡C
¨ Low forward voltage drop
¨ Ideally suited for alternator rectification and load dump

protection

¨ High temperature soldering guaranteed:

260¡C for 10 seconds at terminals

MECHANICAL DATA

Case: Molded plastic body, surface mount with heatsink

integrally mounted in the encapsulation
Terminals: Plated, solderable per MIL-STD-750,
Method 2026

Polarity: Unidirectional as marked
Mounting Position: Any
Weight: 0.095 ounces, 2.68 grams

MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS

Ratings at 25¡C ambient temperature unless otherwise specified.

SYMBOLS AS4024 AS4028 UNITS

Maximum working peak standoff voltage V

WM

18.0 20.0 Volts

Minimum reverse breakdown voltage at 100mA V

(BR)

20.0 24.0 Volts

Maximum reverse breakdown voltage at 100mA V

(BR)

28.0 32.0 Volts

Maximum clamping voltage for 10ms/10ms exponentially
decaying waveform at I

PP

=80A

V

C

38.0 40.0 Volts

Maximum average rectified forward current at T

C

=150

¡C I

(AV)

40.0 Amps

Peak forward surge current, 8.3ms single half sine-wave I

FSM

700.0 Amps

Maximum instantaneous forward voltage at 100A

(NOTE 1)

V

F

0.99 Volts

Non- repetitive peak reverse surge current for 10ms/10ms
exponentially decaying waveform

I

RSM

75.0 Amps

Maximum reverse leakage current at rated V

WMTJ

=25¡C 1.0

T

J

=175¡C

I

R

50.0

mA

Maximum thermal resistance junction to case

(NOTE 2)

R

QJC

0.9 ¡C/W

Operating junction and storage temperature range T

J

, T

STG

-55 to +200 ¡C

NOTE:

(1) Measured on a 300ms square pulse width
(2) Mounted on alternator heat sink

NOTICE: Advanced product information is subject to change without notice.

12/98

PATENTED*

Dimensions in inches and (millimeters)

*Patent #Õs 4,980,315

5,166,769

5,278,094

For positive polarity use ÒPÓ.suffix, for negative polarity use ÒNÓ suffix

(Polarity refers to lead #1)

NEW PRODUCT NEW PRODUCT NEW PRODUCT

CASE STYLE ASC

0.953(24.2)

0.937(23.8)

0.224(5.7)

0.208(4.3)

0.205(5.2)

0.188(4.8)

0.185(4.7)

0.169(4.3)

0.110(2.8)

0.094(2.4)

0.366(9.3)

0.343(8.7)

0.406(10.3)

0.382(9.7)

0.390(9.9)

0.374(9.5)

0.024(5.2)

0.023(.59)

0.205(5.2)

0.188(4.8)

0.087(2.2)

0.071(1.8)

0.342(8.7)

0.327(8.3)

0.098
(2.5)

MIN.

0.539(13.7)

0.524(13.3)

LEAD 2/METAL HEATSINK

LEAD 1



0.413(10.5)

0.374(9.5)

0.197(5.0)

0.185(4.7)

0.028(0.7)

0.012(0.3)

FORWARD CURRENT,

AMPERES

CASE TEMPERATURE, ¡C

FIG. 2 - TYPICAL INSTANTANEOUS FORWARD

CHARACTERISTICS

INSTANTANEOUS FORWARD CUR-

RENT, AMPERES

FORWARD VOLTAGE, VOLTS

175¡C

200¡C

I

PPM

PEAK PULSE CURRENT %

t, TIME, ms

tr=10ms

PEAK VALUE I

PPM

10/10000ms

TA=25¡C
PULSE WIDTH (t

d

) is
DEFINED as the POINT
WHERE the PEAK CURRENT
DECAYS to 50% of I

PP

FIG. 4. - REVERSE POWER CAPABILITY

REVERSE SURGE POWER, WATTS

PULSE WIDTH (ms) - 1/2 IPPEXPONENTIAL WAVEFORM

FIG. 6 - TYPICAL REVERSE CHARACTERISTICS

FIG. 7 - TYPICAL TRANSIENT THERMAL IMPEDANCE

PERCENTAGE OF V

(BR)

, %

PULSE WIDTH, sec.

200¡C

175¡C

FIG. 5 - LOAD DUMP POWER CHARACTERISTICS

(10ms EXPODENTIAL WAVEFORM)

LOAD DUMP POWER, WATTS

TRANSIENT THERMAL IMPEDANCE, ¡C/W

TEMPERATURE, ¡C

RQJC

25¡C

25¡C

RATING AND CHARACTERISTIC CURVES AVALANCHE ALTERNATOR RECTIFIER - AS4024 AND AS4028

FIG. 1 - FORWARD CURRENT DERATING CURVE

FIG. 3 - PULSE WAVEFORM

t

d

HALF VALUE -

I

PP

2

INSTANTANEOUS REVERS CUR-

RENT, MICRO AMPERES

50

45

40

35

30

25

20

15

10

5.0

0

0 20 40 60 80 100 120 140 160 180 200

150

100

50

0

0 5 10 15 20 25 30 35 40

100

10

0.1

0.01

1

0.25

0.35

0.45

0.55

0.75

0.65

10,000

1,000

1

10

0.85

0.95

100

3,500

3,000

2,500

2,000

1,500

1,000

500

0

25

75

50

100

125

100

10

1

0.1

100

10

1

0.1

0.01

0.001

150

175

200

0.0001

5.0

20

95

80

65

50

35

0.01

0.01

0.1

1

10

100