Document Number: 83717 www.vishay.com
Revision 17-August-01

2–53

DESCRIPTION

This data sheet presents five families of Vishay Industry Standard
Single Channel Phototransistor Couplers. These families include the
4N25/26/27/28 types, the 4N35/36/37/38 couplers, the H11A1/A2/
A3/A4/A5, the MCT2/2E, and MCT270/271/272/273/274/275/276/
277 devices.Each optocoupler consists of Gallium Arsenide infra-
red LED and a silicon NPN phototransistor.
These couplers are Underwriters Laboratories (UL) listed to comply
with a 5300 V

RMS



Isolation Test Voltage. This isolation performance
is accomplished through Vishay double molding isolation manufac-
turing process. Compliance to VDE 0884 partial discharge isolation
specification is available for these families by ordering option 1.
Phototransistor gain stability, in the presence of high isolation volt-
ages, is insured by incorporating a TRansparent lOn Shield
(TRIOS)

®

on the phototransistor substrate. These isolation pro-
cesses and the Vishay IS09001 Quality program results in the high-
est isolation performance available for a commercial plastic
phototransistor optocoupler.
The devices are available in lead formed configuration suitable for
surface mounting and are available either on tape and reel, or in
standard tube shipping containers.
.010 (.25)
typ.
.114 (2.90)
.130 (3.0)
.130 (3.30)
.150 (3.81)
.031 (0.80) min.
.300 (7.62)
typ.
.031 (0.80)
.035 (0.90)
.100 (2.54) typ.
.039
(1.00)
Min.
.018 (0.45)
.022 (0.55)
.048 (0.45)
.022 (0.55)
.248 (6.30)
.256 (6.50)
.335 (8.50)
.343 (8.70)
pin one ID
654
123
18°
3°–9°
.300–.347
(7.62–8.81)
4°
typ.
1
2
3
6
5
4
Base
Collector
Emitter
Anode
Cathode
NC
Dimensions in Inches (mm)

DEVICE TYPES

Part No. CTR % Min. Part No. CTR % Min.

4N25 20 MCT2 20
4N26 20 MCT2E 20
4N27 10 MCT270 50
4N28 10 MCT271 45–90
4N35 100 MCT272 75–150
4N36 100 MCT273 125–250
4N37 100 MCT274 225–400
4N38 10 MCT275 70–90
H11A1 50 MCT276 15–60
H11A2 20 MCT277 100
H11A3 20
H11A4 10
H11A5 30

FEATURES
• Interfaces with Common Logic Families
• Input-output Coupling Capacitance < 0.5 pF
• Industry Standard Dual-in-line 6-pin Package
• Field Effect Stable by TRIOS

®

• 5300 V

RMS

Isolation Test Voltage
• Underwriters Laboratory File #E52744
• VDE #0884 Approval Available with Option 1
APPLICATIONS
• AC Mains Detection
• Reed Relay Driving
• Switch Mode Power Supply Feedback
• Telephone Ring Detection
• Logic Ground Isolation
• Logic Coupling with High Frequency Noise
Rejection

Notes:

Designing with data sheet is covered in Application Note 45.
V
DE

Phototransistor

Industry Standard Single Channel 6 Pin DIP Optocoupler