Siemens IL256A Datasheet

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IL256A

AC INPUT PHOTOTRANSISTOR

SMALL OUTLINE

SURFACE MOUNT OPTOCOUPLER

NE

FEATURES

• Guranteed CTR Symmetry, 2:1 Maximum

• Bidirectional AC Input
Industry Standard SOIC-8 Surface

• Mountable Package

• Standard Lead Spacing, .05"

• Available in Tape and Reel Option
(Conforms to EIA Standard RS481A)

DESCRIPTION

The IL256A is an AC input phototransistor optocou­pler. The device consists of two infrared emitters
connected in anti-parallel and coupled to a silicon
NPN phototransistor detector.

These circuit elements are constructed with a stan­dard SOIC-8 foot print.

The product is well suited for telecom applications
such as ring detection or off/on hook status, given
its bidirectional LED input and guaranteed current
transfer ratio (CTR) minimum of 20% at I

= 10 mA.

F

Maximum Ratings
Emitter

Continuous Forward Current.........................60 mA

Power Dissipation at 25 °
Derate Linearly from 25 °

C...........................90 mW

C..................... 0.8 mW/ ° C

Detector

Collector-Emitter Breakdown Voltage.............. 30 V

Emitter-Collector Breakdown Voltage................ 5 V

Collector-Base Breakdown Voltage................. 70 V

Power Dissipation ..................................... 150 mW

Derate Linearly from 25 °

C..................... 2.0 mW/ ° C

Package

Total Package Dissipation at 25 ° C Ambient

(LED + Detector)....................................240 mW

Derate Linearly from 25 °

Storage Temperature .................. –55 °

Operating Temperature ............... –55 °

Soldering Time at 260 °

C..................... 3.1 mW/ ° C

C to +150 ° C
C to +100 ° C

C..............................10 sec.

Dimensions in inches (mm)

.120±.005

(3.05±.13)

.240

6.10)

Pin One ID

.192±.005
(4.88±.13)

.004 (.10)
.008 (.20)

.021 (.53)

Characteristics (T

Emitter

Forward Voltage V

Detector

Breakdown Voltage
Collector-Emitter
Emitter-Collector
Collector Base

Leakage Current,
Collector-Emitter

Package

DC Current Transfer
Ratio

Symmetry
CTR at +10mA

=25 ° C)

A

CTR at –10 mA

Anode/

Anode

NC
NC

1

2

3

4

40°

5° max.

R.010
(.25) max.

Cathode

.154±.005

C

L

(3.91±.13)

.016 (.41)

.050 (1.27)

typ.

Sym­bol

BV
BV
BV

I

CTR 20 % I

Min. Typ. Max. Unit Condition

F

30

CEO

5

ECO

70

CBO

CEO

0.5 1.0 2.0

Cathode/

.015±.002

(.38±.05)

.008 (.20)

.020±.004

(.15±.10)

2 plcs.

1.2 1.5 V I

50
10
90

550nA V

7°

.058±.005

(1.49±.13)

V
V
V

8

NC

7

Base

6

Collector

5

Emitter

.125±.005

(3.18±.13)

Lead
Coplanarity
±.0015 (.04)
max.

= ± 10 mA

F

I

=1 mA

C

I

=100 µ A

E

I

=100 µ A

C

=10 V

CE

= ± 10 mA,

F

V

=5 V

CE

Saturation Voltage,
Collector-Emitter

Isolation Voltage,
Input to Output

5–1

V

V

CEsat

2500 VAC

IO

0.4 I

RMS

= ± 16 mA,

F

I

=2 mA

C

Figure 1. LED forward current versus forward voltage

60
40

85°C

20

25°C

0

-55°C

-20

-40

-60

-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5

IF - LED Forward Current - mA

VF - LED Forward Voltage - V

Figure 2. Forward voltage versus forward current

1.4

1.3

1.2

1.1

1.0

0.9

Vf-Forward Voltage - V

0.8

0.7
.1 1 10 100

Ta = -55°C

Ta = 25°C

Ta = 100°C

If - Forward Current - mA

Figure 5. Normalized saturated CTR

1.0

0.8

Ta = 25°C
Ta = 50°C

Ta = 70°C

Vce(sat) = 0.4V

Ta = 100°C

0.6

0.4

Normalized CTR

0.2

Normalized to:
If = 10 mA. Vce =10V

Ta = 25°C

0.0
.1 1 10 100

If - LED Current - mA

Figure 6. Normalized CTRcb

1.5
Normalized to:
If=10mA, Ta=25°C

1.0

0.5

Normalized CTRcb

0.0

.1 1 10 100

If - LED Current -mA

25°C
50°C
70°C

Figure 3. Peak LED current versus duty factor, Tau

10000

Duty Factor

.005

1000

If(pk) - Peak LED Current - mA

.01
.02

.05

.1

.2

.5

100

10

10-610-510-410-310-210-110010

t - LED Pulse Duration - s

τ

t

τ

DF = /t

1

Figure 4. Normalized CTR versus If and Ta

2.0

Ta = 25°C

1.5

Ta = 50°C
Ta = 70°C
Ta = 100°C

1.0

Normalized CTR

0.5

0.0
.1 1 10 100

If - LED Current - mA

Normalized to :

If = 10 mA, Vce =10V

Ta = 25°C

Figure 7. Photocurrent versus LED current

1000

100

10

25°C
70°C

1

Icb - Photocurrent - µA

.1

.1 1 10 100

If - LED Current - mA

Figure 8. Base current versus If and HFE

700

Vce=0.4V, Ta=25°C

600

500

400

300

HFE - Transistor Gain

200

100

1 10 100 1000

Ib - Base Current - µA

100

10

1

If- LED Current-mA

.1

5–2

IL256A