Datasheet MCT4 Datasheet (Fairchild Semiconductor)

0.048 (1.22)

0.028 (0.71)

45°

0.046 (1.16)

0.036 (0.92)

42

0.195 (4.96)

0.178 (4.52)

0.230 (5.84)

0.209 (5.31)

0.560 (14.22)

0.500 (12.70)

0.210 (5.34)

0.170 (4.32)

3

0.100 (2.54) DIA.

1

0.019 (0.48)

0.016 (0.41)

Ø4X

PACKAGE DIMENSIONS

FEATURES

• Hermetically package

• High current transfer ratio; typically 35%

• High isolation resistance; 10

11

ohms at 500 volts

• High voltage isolation emitter to detector

NOTES:

1. Dimensions for all drawings are in inches (mm).

2. Tolerance of ± .010 (.25) on all non-nominal dimensions
unless otherwise specified.

DESCRIPTION

The MCT4 is a standard four-lead, TO-18 package containing a GaAs infrared emitting diode optically coupled to an NPN silicon
planar phototransistor.



2001 Fairchild Semiconductor Corporation

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SCHEMATIC

PHOTOTRANSISTOR OPTOCOUPLER

MCT4

ANODE

CATHODE

1

3

2

COLLECTOR

4 EMITTER

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Parameter Symbol Rating Unit

Operating Temperature

T

OPR -55 to +125 °C

Storage Temperature T

STG

-65 to +150 °C

Soldering Temperature (Flow) T

SOL-F

260 for 10 sec °C

EMITTER

P

D

Power Dissipation at 25°C Ambient

(1)

90 mW

Continuous Forward Current I

F

40 mA

Reverse Voltage V

R

3V

Forward Current - Peak (1 µs pulse, 300 pps) IF(pk) 3.0 A

DETECTOR

P

D

Power Dissipation

25°C Ambient

(2)

200 mW

Collector to Emitter Voltage

V

CEO

30 V

Emitter to Collector Voltage V

ECO

7V

COUPLER

Total Power Dissipation

(3)

P

D

250 mW

Isolation Voltage 1000 VDC

ABSOLUTE MAXIMUM RATINGS

(TA= 25°C unless otherwise specified)

ELECTRICAL / OPTICAL CHARACTERISTICS (T

A

=25°C)

PHOTOTRANSISTOR OPTOCOUPLER

MCT4

Parameters Test Conditions Symbol Min Typ Max Units

EMITTER

Forward Voltage

I

F

= 40 mA V

F

1.30 1.50 V

Reverse Current

V

R

= 3.0 V

I

R

0.15 10 µA

Capacitance

V = 0 V

C

150

pF

DETECTOR

Breakdown Voltage

Collector to Emitter

I

C

= 1.0 mA, IF= 0 BV

CEO

30 V

Emitter to Collector IE= 100 µA, IF= 0 BV

ECO

712 V

Leakage Current

Collector to Emitter

V

CE

= 10 V, IF= 0 I

CEO

550nA

Capacitance

pF

Collector to Emitter

V

CE

= 0 C

CE

2

INDIVIDUAL COMPONENT CHARACTERISTICS

NOTE:

1. Derate power linearly 1.2 mW/°C above 25°C

2. Derate power linearly 2.67 mW/°C above 25°C

3. Derate power linearly 3.3 mW/°C above 25°C

DC Characteristics Test Conditions Symbol Min Typ Max Units

COUPLED

CTR

DC current Transfer Ratio (note 1)

VCE= 10 V , IF= 10 mA 15 35 %

Saturation Voltage

I

C

= 500 µA, IF= 10 mA

V

CE(SAT)

0.1
V

I

C

= 2 mA, IF= 50 mA

0.2 0.5

AC Characteristics Test Conditions Symbol Min Typ Max Units

Capacitance LED to Detector 1.8 pF
Bandwidth (Fig. 5)

Note 2 300 kHz

Rise Time and Fall Time (see operating schematic)

I

C

= 2 mA, VCE= 10 V , Note 3

2 µs

TRANSFER CHARACTERISTICS

(TA= 25°C Unless otherwise specified.)

PHOTOTRANSISTOR OPTOCOUPLER

MCT4

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NOTE:

1. The current transfer ratio (IC/IF) is the ratio of the detector collector current to the LED input current with VCEat 10 volts.

2. The frequency at which i

c

is 3 dB down from the 1 kHz value.

3. Rise time (t

r

) is the time required for the collector current to increase from 10% of its final value, to 90%. Fall time (tf) is the time required

for the collector current to decrease from 90% of its initial value to 10%.

Characteristic Test Conditions Symbol Min Typ Max Units

Isolation Resistance

V

= 500 VDC

R

ISO

10

11

10

12

!

Breakdown Voltage Time = 1 sec

1000

1500

VDC

ISOLATION CHARACTERISTICS

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PHOTOTRANSISTOR OPTOCOUPLER

MCT4

Figure 1. Detector Output Characteristics

20

25

20

15

10

5

, COLLECTOR CURRENT DETECTOR (mA)

C

I

Figure 3. Dark Current vs. Temperature

-4

10

-5

10

-6

10

-7

10

-8

10

-9

DARK CURRENT (A)

10

CEO,

I

-10

10

-11

10

-12

10

IF = 60 mA

IF = 40 mA

5

10 15 20 25 30

V

, COLLECTOR VOLTAGE DETECTOR (V)

CE

V

= 10 VOLTS

CE

-40-60

-20 0 20 40 60 80 100 120 140
T

, AMBIENT TEMPERATURE (

A

IF = 20 mA

IF = 10 mA

°C)

Figure 2. Input Current vs. Output Current

20

25

V

= 10 VOLTS

20

CE

15

10

5

, COLLECTOR CURRENT DETECTOR (mA)

C

I

0

20 30 40 50 60

100

, INPUT CURRENT LED (mA)

I

F

Figure 4. Current Output vs. Temperature

110

100

90

80
70

NORMALIZED (%)

60

,

CTR

50

40

30

-40-60
T

LED CURRENT - 10 mA
V

= 10 VOLTS

CE

FREE STANDING DEVICE

-20 0 20 40 60 80 100
, AMBIENT TEMPERATURE (

A

°C)

2.0

Figure 5. Output vs. Frequency

Figure 6. Switching Time vs. Collector Current

1.8

1.6
V

= 10 VOLTS

CE

1.4

1.2

1.0

0.8

COLLECTOR CURRENT (mA)

0.6

0.4

0.2

1K 110K 100K

FREQUENCY (Hz)

L

R

R

L

= 470 Ω

= 1000 Ω

R

L

= 100 Ω

V

= 10 VOLTS

CE

12

10

= 1000 Ω

R

L

8

6

SWITCHING TIME (µs)

= 470 Ω

R

L

4

= 100 Ω

R

2

0.3 0.4 0.6 0.8 1 2 3 4 5 6 7 8 10

0.20.1

, COLLECTOR CURRENT (mA

I

C

L

)

PHOTOTRANSISTOR OPTOCOUPLER

MCT4

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MODULATION
INPUT

1 µF

LED

I

F

47 Ω

CONSTANT
CURRENT
INPUT

I

C

V

DETECTOR

CC

RL = 100 Ω

Figure 7. Modulation Circuit Used to Obtain Output vs.

Frequency Plot

= 10 VOLTS

OUTPUT

I

C

PULSE
INPUT

LED

47 Ω

I

F

λλ

VCC = 10 VOLTS

DETECTOR

RL = 100 Ω

Figure 8. Circuit Used to Obtain Switching Time vs.

Collector Current Plot

PULSE
OUTPUT

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED
HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF
OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or
systems which, (a) are intended for surgical
implant into the body,or (b) support or sustain life,
and (c) whose failure to perform when properly
used in accordance with instructions for use provided
in labeling, can be reasonably expected to result in a
significant injury of the user.

2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.

PHOTOTRANSISTOR OPTOCOUPLER

MCT4

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