4N55/L4 - ISOCOM Limited - Datasheet.Live

Hutton Close, Crowther Ind Est, Dist 3, Washington, Tyne & Wear NE38 0AH, England

Email: isocom@dial.pipex.com - Tel: +44 0191 4166546 - Fax: +44 0191 4155055

4N55, 4N55/L2, L3, L4

Dual Channel High Speed Hermetically

Sealed Optocoupler

Circuit and Package

Features

Description

Absolute Maximum Ratings

Recommended Operating Conditions

Electrical Characteristics

Typical Characteristics

Radiation Effects Data

Reliability and Approvals

Similar Optocouplers

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Circuit and Package

4N55, 4N55/L2, L3, L4: Optocoupler, 16 Pin Dual Channel High Speed Hermetically Sealed (Datasheet)

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Features

Release to BS9400 GO125

Hermetically Sealed

High Speed: Typically 400 kbit/s

1500 Vdc Withstand Test Voltage

High Radiation Immunity

Performance Guaranteed Over -55°C to +125°C Ambient Temperature Range

2 MHz Bandwidth

Description

The 4N55 consists of two independent optocouplers in a hermetically sealed ceramic package. Each

channel has a light emitting diode and an integrated photon detector. Separate connections for the

photodiodes and output transistor collectors improve the speed up to 100 times that of a conventional

phototransistor optocoupler by reducing the base collector capacitance.

The 4N55 is suitable for wide bandwidth analogue applications, as well as for interfacing TTL to LSTTL

or CMOS. The availability of the base lead allows optimised gain/bandwidth adjustment in analog

applications. The shallow depth of the IC photodiode provides better radiation immunity than

conventional phototransistor couplers. Surface Mount Option Available.

Absolute Maximum Ratings

Storage Temperature:

Operating Temperature:

Lead Soldering:

-65°C to +150°C

-55°C to +125°C

260°C for 10s, 1.6mm from case

Input Diode (each channel)

Peak forward current IF:

Average Forward Current IF:

Reverse Voltage VR:

Power Dissipation:

40mA (duration <= 1ms)

20mA

36mW

Output Detector (each channel)

4N55, 4N55/L2, L3, L4: Optocoupler, 16 Pin Dual Channel High Speed Hermetically Sealed (Datasheet)

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Supply Voltage VCC:

Average Current IO:

Peak Current IO:

Voltage VO:

Emitter-Base Reverse Voltage BVEBO:

Base Current IB:

Power Dissipation:

Derate Linearly:

-0.5V to 20V (1 minute max)

8mA

16mA

-0.5V to 20V

5mA

50mW

1.4mW/°C above 100°C

Recommended Operating Conditions

PARAMETER SYMBOL MIN MAX UNIT

Input Current, Low Level (each channel) IFL 250 µA

Supply Voltage, Output VCC 2 18 V

Electrical Characteristics

(Over recommended temperature Ta= -55°C to +125°C u.o.s.; all typical values at Vcc=5V, Ta=25°C

each channel.)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT NOTES

IOH Logic High Output Current IF=0, VO=VCC=18V,

IF(other channel)=20mA 30 100 µA

Output Leakage Current IF=250µA, ... 70 250 µA

ICCL Logic Low Supply Current VCC=18V, IF1,2=20mA 30 200 µA

ICCH Logic High Supply

Current VCC=18V, IF=0mA,

IF(other channel)=20mA 0.4 10 µA

VFInput Forward Voltage IF=20mA 1.45 1.8 V 1

BVRInput Reverse Breakdown

Voltage IR=10µA 3 V

II-O Input-Output Insulation

Leakage Current RH=45%, TA=25°C, t=5s,

VIO=1500Vdc 1.0 µA 3, 9

tPLH Propagation Delay Time to

Logic High at Output RL=8.2kohm, CL=50pF,

IF=16mA, VCC=5V

2.0 6.0 µs 1

tPHL Propagation Delay Time to

Logic Low at Output 0.4 2.0 µs

4N55, 4N55/L2, L3, L4: Optocoupler, 16 Pin Dual Channel High Speed Hermetically Sealed (Datasheet)

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CTR Current Transfer Ratio VO=0.4V, IF=16mA,

VCC=4.5V 9 20 % 1, 2

Typical Characteristics

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT NOTES

dVF/dTATemperature Coefficient

of Forward Voltage IF=20mA -1.9 mV/°C

CIN Input Capacitance VF=0, f=1MHz 125 pF

RI-O Resistance (Input-Output) VI-O=500Vdc 1E12 ohm

CI-O Capacitance

(Input-Output) f=1MHz 1.0 pF 1, 4

II-I Input-Input Insulation

Leakage Current RH=45%, VH=500Vdc,

t=5s 1 pA 5

CI-I Capacitance (Input-Input) f=1MHz 0.6 pF

hFE Transistor DC Current

Gain VO=5V, IO=3mA 130 1

dIO/dIFSmall Signal Current

Transfer Ratio VCC=5V, VO=2V 20 %

CMH

Common Mode Transient

Immunity at Logic High

Level Output

VCM=10Vp-p,

RL=8.2kohm, IF=0,

VO(min)=2.0V 1000 V/µs 1, 6

CML

Common Mode Transient

Immunity at Logic Low

Level Output

VCM=10Vp-p,

RL=8.2kohm, IF=16,

VO(max)=0.8V -1000 V/µs 1, 7

BW Bandwidth RL=100ohm 2 MHz 8

Notes

1. Each channel.

2. Current Transfer Ratio is defined as the ratio of output collector current Io to the forward LED input

current If, times 100%. CTR is known to degrade slightly over the unit's lifetime as a function of input

current, temperature, signal duty cycle and system on-time. It is recommended that designers allow at

least 20-25% guardband for CTR degradation.

3. Measured between pins 1 through 8 shorted together and pins 9 through 16 shorted together.

4. Measured between each input pair shorted together and the output pins for that channel shorted

together.

5. Measured between pins 3 and 4 shorted together, and pins 7 and 8 shorted together.

6. CMh is the steepest slope (dV/dt) on the leading edge of the common mode pulse Vcm for which the

output will remain in the logic high state (Vo>2.0V).

4N55, 4N55/L2, L3, L4: Optocoupler, 16 Pin Dual Channel High Speed Hermetically Sealed (Datasheet)

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8. CMl is the steepest slope (dV/dt) on the trailing edge of the common mode pulse Vcm for which the

output will remain in the logic low state (Vo<0.8V).

9. This is a momentary withstand test, not an operation condition.

Radiation Effects Data

Neutron Fluence: Hard to > 3E12n/cm2

Total Dose: Hard to 1 Mrad (Si)

Dose Rate: Hard to 6E9 rad (Si)/sec

Vcc photocurrent up to 1.6A; up to 5µs output transient upset

Reliability and Approvals

Isocom Ltd supplies high reliability devices for applications requiring an operating temperature range of

-55°C to +125°C (e.g. military applications).

Devices supplied have completed rigorous testing, and various high reliability test options are offered.

The Company is developing a suitable specification to permit release to CECC 20000.

As a manufacturer of high reliability optocouplers Isocom Ltd's manufacturing plant in North East

England, has site approval to BS9000 (registered number 1294/M) issued by the British Standards

Institution. Together with CECC, BS9000 is a preferred standard for use in European military projects.

Consequently, Isocom Ltd's approved devices are listed in the CECC "MUAHAG" preferred products

list.

The BS9000 approval is also recognised as meeting the equivalent criteria to those required by

BS5750/ISO9000/EN29000.

The Company's customers can be assured of our commitment to stringent quality, reliability and

inspection standards, as demonstrated by our existing approvals. Other customer-specific options can

also be offered.

Isocom takes great effort to ensure accurate data, but regrettably cannot be held liable for any error on its

website. Visit File Lists to confirm old printouts are up-to-date.

Contents

4N55, 4N55/L2, L3, L4: Optocoupler, 16 Pin Dual Channel High Speed Hermetically Sealed (Datasheet)

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