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4N25, 4N26, 4N27, 4N28
Optically Coupled Isolators

Circuit
Features
Description
Absolute Maximum Ratings
Electrical Characteristics

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Circuit

Features

2500, 1500 or 500 Volt Isolation.
High DC Current Transfer Ratio.
Low Cost Dual-In-Line Package.

Description

The 4N25, 4N26, 4N27, 4N28 are optically coupled isolators consisting of a Gallium Arsenide infrared emitting diode and an NPN silicon phototransistor mounted in a standard 6-pin dual-in-line package. Surface Mount Option Available.
All electrical parameters are 100% tested by manufacturing. Specifications are guaranteed to a cumulative 0.65% AQL.

Absolute Maximum Ratings: (Ta=25°C)

Storage Temperature:
Operating Temperature:
Lead Soldering:
Input-to-Output Isolation Voltage:
-55°C to +150°C
-55°C to +100°C
260°C for 10s, 1.6mm from case
±2500V (4N25)
±1500V (4N26, 4N27)
±500V (4N28)

Input Diode

Forward DC Current:
Reverse DC Voltage:
Peak Forward Current:
Power Dissipation:
Derate Linearly:
80mA
3V
3A (t p=10µs)
100mW
1.33mW/°C above 25°C

Output Transistor

Collector-Emitter Voltage:
Emitter-Collector Voltage:
Collector-Base Voltage:
Power Dissipation:
Derate Linearly:
30V
7V
70V
150mW
2.00mW/°C above 25°C

Package

Total Power Dissipation:
Derate Linearly:
250mW
3.3mW/°C above 25°C

Electro-optical Characteristics: (Ta=25°C)

INPUT PARAMETER CONDITIONS MIN TYP MAX UNIT
VF Forward Voltage IF=10mA

1.5 V
IR Reverse Current VR=3V

100 µA
VR Reverse Breakdown Voltage IR=10µA 3

V
OUTPUT PARAMETER CONDITIONS MIN TYP MAX UNIT
BVCEO Collector-Emitter Voltage IC=1mA 30

V
BVECO Emitter-Collector Voltage IE=100µA 7

V
BVCBO Collector-Base Voltage IC=100µA 70

V
ICEO Collector-Emitter Dark Current



4N25, 4N26, 4N27 VCE=10V, IB=0

50 nA
4N28

100 nA
ICBO Collector-Base Dark Current VCB=10V, IE=0

20 nA
CCE Collector-Emitter Capacitance VCE=0
10
pF
HFE
VCE=5.0V, IC=100µA
150

COUPLED PARAMETER CONDITIONS MIN TYP MAX UNIT
IC/IF DC Current Transfer Ratio



4N25, 4N26 IF=10mA, VCE=10V 20 50
%
4N27, 4N28 IB=0 10 20
%
RIO Input-to-Output Isolation Resistance VIO=500V, (Note 1) 1E11

ohm
VCE(SAT) Collector-Emitter Saturation Voltage IF=50mA, IC=2mA

0.5 V
CIO Capacitance Input to Output f=1MHz (note 1)
0.6
pf
TR Output Rise Time VCC=10V, IC=2mA, RL=100ohm
2
µs
TF Output fall Time µs

Input-Output Isolation Voltage


V
4N25 (Note 1) 2500


4N26, 4N27 1500


4N28 500


Notes

1. Measured with input leads shorted together and output leads shorted together.

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.

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