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Low Current Opto-Coupler

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Quoting product code: CY94C


About this product


  • A transistor optocoupler in a DIP-4 package with a low current input
  • Very high coupling transfer ratio (CT)
  • Can be end stacked if necessary

Product overview

A transistor optocoupler in a DIP-4 package with a low current input and a very high coupling transfer ratio (CTR), typically 120%. The device has good CTR linearity relative to forward current and a high VCEO of 55Vdc. The device can be ‘end stacked’ if necessary (2.54mm spacing).


Emitter – maximum ratings
Reverse voltage: 6V
DC forward current: 50mA
Surge forward current (10µS): 2.5A
Total power dissipation: 70mW
Detector maximum ratings
Collector current 50mA
Surge collector current (1mS): 100mA
Total power dissipation: 150mW
Coupling capacitance: 0.25pF
IF = 1mA, VCE = 0·5V: 63% to 125%
IF = 0·5mA, VCE = 1·5V: 75% ( 32%)

As soon as I connect both wires of a door buzzer to the COLLECTOR and EMITTER, the door buzzes, even if I have the ANODE and CATHODE powered/unpowered. When using a simple LED instead, the optocoupler works as expected. What am I missing?

Asked by: Dan1
As much as we would love to be able to help here, we cannot offer design project advice or assistance
Answered by: Billy
Date published: 2017-04-12

Is there a data sheet for this IC , thanks..//

Asked by: Fuji
A datasheet can be viewed and downloaded from the following link;
Answered by: Gareth
Date published: 2016-06-13

Is there any datasheet for the IC? 

Asked by: Giz1007
Yes i have emailed you one to your email address.
Answered by: Darren
Date published: 2016-06-04

Same question as everybody else: What is the manufacturer's part number? I can't find  "download tab on the products webpage"

Asked by: Paul
The link can be found here
Answered by: Billy
Date published: 2017-04-12

What is this opto-coupler's part number?

Asked by: Sean
This information is best detailled in the user manual / datasheet which is available from the download tab on the products webpage, if you do need any in-depth Technical support please feel free to give us a call on 0333 400 9500 or email us on
Answered by: Dominic
Date published: 2017-04-12

Is this opto coupler a suitable replacement for a Sharp PC817?

Asked by: Aristokat
Please be assured, if you have any queries with regards to specific products from our stock, we will be more than happy to assist. However, it is important to note that as a retail only company we are unable to assist with any design projects or queries, or advise on specific products that may be required for your purpose if you do not currently have the design/circuit information detailing the value of the components needed.
Answered by: Neil G
Date published: 2016-04-30
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