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Hutton Close, Crowther Ind Est, Washington, Tyne & Wear NE38 0AH, England
Email: enquiry@isocomoptocouplers.com - Tel: +44 (0)191 4166546 - Fax: +44 (0)191 4155055
Hutton Close, Crowther Ind Est, Washington, Tyne & Wear NE38 0AH, England
Email: enquiry@isocomoptocouplers.com
- Tel: +44 (0)191 4166546 - Fax: +44 (0)191 4155055
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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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
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 5V 36mW |
Output Detector (each channel) | |
| 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 3V 5mA 50mW 1.4mW/°C above 100°C |
| 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 | 1 | |
| 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 | ||
| VF | Input Forward Voltage | IF=20mA | 1.45 | 1.8 | V | 1 | |
| BVR | Input 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 | |||
| 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/dTA | Temperature Coefficient of Forward Voltage | IF=20mA | -1.9 | mV/°C | 1 | ||
| 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/dIF | Small 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 | ||
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).
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.
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
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.