BD675 BD675A BD677 BD677A BD679 BD679A BD681

2

Motorola Bipolar Power Transistor Device Data

Characteristic

Symbol

Min

Max

Unit

OFF CHARACTERISTICS

Collector–Emitter Breakdown Voltage(1)

BD675, 675A

(IC = 50 mAdc, IB = 0)

BD677, 677A

BD679, 679A

BD681

BVCEO

45

60

80

100

—

—

—

—

Vdc

Collector Cutoff Current (VCE = Half Rated VCEO, IB = 0)

ICEO

—

500

µAdc

Collector Cutoff Current

(VCB = Rated BVCEO, IE = 0)

(VCB = Rated BVCEO, IE = 0, TC = 100’C)

ICBO

—

—

0.2

2.0

mAdc

Emitter Cutoff Current (VBE = 5.0 Vdc, IC = 0)

IEBO

—

2.0

mAdc

ON CHARACTERISTICS

DC Currert Gain(1)

(IC = 1.5 Adc,VCE = 3.0 Vdc)

BD675, 677, 679, 681

(IC = 2.0 Adc, VCE = 3.0 Vdc)

BD675A, 677A, 679A

hFE

750

750

—

—

—

Collector–Emitter Saturation Voltage(1)

(IC = 1.5 Adc, IB = 30 mAdc)

BD677, 679, 681

(IC = 2.0 Adc, IB = 40 mAdc)

BD675A, 677A, 679A

VCE(sat)

—

—

2.5

2.8

Vdc

Base–Emitter On Voltage(1)

(IC = 1.5 Adc, VCE = 3.0 Vdc)

BD677, 679, 681

(IC = 2.0 Adc, VCE = 3 0 Vdc)

BD675A, 677A, 679A

VBE(on)

—

—

2.5

2.5

Vdc

DYNAMIC CHARACTERISTICS

Small Signal Current Gain (IC = 1.5 Adc, VCE = 3.0 Vdc, f = 1.0 MHz)

hfe

1.0

—

—

(1) Pulse Test: Pulse Width

v 300 µs, Duty Cycle v 2.0%.

Figure 2. DC Safe Operating Area

5.0

1.0

VCE, COLLECTOR–EMITTER VOLTAGE (VOLTS)

2.0

1.0

0.5

0.05

2.0

5.0

10

50

100

BONDING WIRE LIMIT

THERMALLY LIMIT at TC = 25°C

SECONDARY BREAKDOWN LIMIT

0.2

0.1

TC = 25°C

BD675, 675A

BD677, 677A

BD679, 679A

BD681

20

There are two limitations on the power handling ability of a

transistor average junction temperature and secondary

breakdown. Safe operating area curves indicate IC – VCE lim-

its of the transistor that must be observed for reliable opera-

tion; e.g., the transistor must not be subjected to greater

dissipation than the curves indicate.

At high case temperatures, thermal limitations will reduce

the power that can be handled to values less than the limita-

tions imposed by secondary breakdown.

Figure 3. Darlington Circuit Schematic

BASE

NPN

BD675, 675A

BD677, 677A

BD679, 679A

BD681

COLLECTOR

EMITTER

[ 8.0 k

[ 120