Optocouplers - analog output
(5 326)Optical couplers combine an optoelectronic element (phototransistor) and a light-emitting element (usually a LED). They are used to isolate circuits, typically in controllers, to avoid interferences in digital circuit operation caused by currents and voltage spikes induced when activating/deactivating large consumers (e.g. inductive loads, such as electromagnetic relays).
Parameters and use of optical couplers with analogue outputs
Optical coupler operation and its implementation in a circuit is simple, as it requires only LED operation. The element leads are connected with a phototransistor emitter and collector. In this set-up, the base current depends on the intensity of light illuminating a photosensitive structure, so the component operation is not binary, but analogue. It enables a designer to take advantage of the basic principles of electronic circuit structure. Therefore, an optical coupler ensures considerable amplification and helps control consumers requiring relatively high-intensity currents for operation. Thus CTR, i.e. Current Transfer Ratio between the component input and output, is one of the key parameters. Selected component models feature the Darlington configuration to additionally improve optical coupler amplification.
Other important optical coupler properties include the actuation speed (time), which determines the delay between voltage application at the optoelectrical input and opening of a channel between the collector input and phototransistor emitter. Similarly, component manufacturers also specify the deactivation time. Such characteristics determine whether a component is suitable for a given application.
Optical couplers come in numerous enclosure formats, i.e. for through-hole assembly (THT) and surface-mounted (SMD), mostly housed in bodies typical for integrated circuits. Note that they are also available in multi-channel versions (2, 3 or 4 mutually separated channels). They frequently come with a separate lead shorted to the phototransistor base to facilitate independent control of the current flow at the output, circuit tuning, etc.
Optical coupler applications
As it has been mentioned above, circuit isolation is the most important feature of optical couplers, which is of vital importance most of their applications. Therefore, they help avoid potential damage caused by ripples and voltage spikes. This also makes them ideal for installation in circuits tasked with change voltage proportionally between the controller and the consumer. This property is used for signal transmission purposes, e.g. in controls for industrial and consumer automation systems, in particular to operate motors, servomotors and actuators. They can also be used for the logical level conversion. Because they can operate at high frequency, they are often used in telecommunications equipment, in particular in situations with a risk of significant interference affecting transmission lines. For example, this applies to state-of-the-art, centralised machinery parks where isolation between communication circuits (RS-232, RS-485, PROFIBUS, PROFINET etc.) and servers supervising certain equipment operation is required. Optical couplers are also similarly applied in Ethernet networks.
The isolating (separating) properties of optical couplers make them a good choice for feedback systems, where a sensitive circuit equipped with an A/C converter controls circuits in which significant interferences may occur, e.g. within analogue sensor lines. To this end, they are used, for example, in power supply modules to adjust the device power through constant voltage and current monitoring. They enable designers to create protective circuits for overcurrent protection, short-circuit protection, etc.
Moreover, it is worth noting here that optical couplers are essential components of numerous medical devices, e.g. vital signs monitors, ECG monitors, etc. In such applications, isolation between the power grid and components coming in contact with the patient is particularly important.
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Optocoupler; SMD; Ch: 1; OUT: transistor; Uinsul: 3.75kV; Uce: 80V
Manufacturer part number: LTV-356T
Manufacturer: LITEON
Net price for quantities from 1 pcs - 0.29 USDGross price for quantities from 1 pcs - 0.29 USD
Net price for quantities from 10 pcs - 0.20 USDGross price for quantities from 10 pcs - 0.20 USD
Net price for quantities from 100 pcs - 0.12 USDGross price for quantities from 100 pcs - 0.12 USD
Net price for quantities from 300 pcs - 0.09 USDGross price for quantities from 300 pcs - 0.09 USD
Net price for quantities from 500 pcs - 0.09 USDGross price for quantities from 500 pcs - 0.09 USD
Net price for quantities from 1000 pcs - 0.08 USDGross price for quantities from 1000 pcs - 0.08 USD
Net price for quantities from 3000 pcs - 0.08 USDGross price for quantities from 3000 pcs - 0.08 USD
Net price for quantities from 6000 pcs - 0.07 USDGross price for quantities from 6000 pcs - 0.07 USD
31591 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; SMD; Ch: 1; OUT: transistor; Uinsul: 3.75kV; Uce: 35V
Manufacturer part number: LTV-354T
Manufacturer: LITEON
Net price for quantities from 1 pcs - 0.42 USDGross price for quantities from 1 pcs - 0.42 USD
Net price for quantities from 10 pcs - 0.30 USDGross price for quantities from 10 pcs - 0.30 USD
Net price for quantities from 100 pcs - 0.17 USDGross price for quantities from 100 pcs - 0.17 USD
Net price for quantities from 300 pcs - 0.13 USDGross price for quantities from 300 pcs - 0.13 USD
Net price for quantities from 500 pcs - 0.12 USDGross price for quantities from 500 pcs - 0.12 USD
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Net price for quantities from 1000 pcs - 0.11 USDGross price for quantities from 1000 pcs - 0.11 USD
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20881 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; THT; Ch: 1; OUT: transistor; Uinsul: 5kV; Uce: 35V; DIP4
Manufacturer part number: EL817(C)
Manufacturer: EVERLIGHT
Net price for quantities from 5 pcs - 0.19 USDGross price for quantities from 5 pcs - 0.19 USD
Net price for quantities from 25 pcs - 0.10 USDGross price for quantities from 25 pcs - 0.10 USD
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Net price for quantities from 500 pcs - 0.07 USDGross price for quantities from 500 pcs - 0.07 USD
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3553 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; SMD; Ch: 1; OUT: transistor; Uinsul: 5kV; Uce: 80V; PC817
Manufacturer part number: PC817X1NIP1B
Manufacturer: SHARP
Net price for quantities from 1 pcs - 0.57 USDGross price for quantities from 1 pcs - 0.57 USD
Net price for quantities from 10 pcs - 0.29 USDGross price for quantities from 10 pcs - 0.29 USD
Net price for quantities from 50 pcs - 0.25 USDGross price for quantities from 50 pcs - 0.25 USD
Net price for quantities from 100 pcs - 0.22 USDGross price for quantities from 100 pcs - 0.22 USD
Net price for quantities from 250 pcs - 0.21 USDGross price for quantities from 250 pcs - 0.21 USD
Net price for quantities from 500 pcs - 0.20 USDGross price for quantities from 500 pcs - 0.20 USD
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Net price for quantities from 2000 pcs - 0.19 USDGross price for quantities from 2000 pcs - 0.19 USD
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Net price for quantities from 6000 pcs - 0.18 USDGross price for quantities from 6000 pcs - 0.18 USD
6288 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; THT; Ch: 1; OUT: transistor; Uinsul: 5kV; Uce: 35V; DIP4
Manufacturer part number: LTV-814
Manufacturer: LITEON
Net price for quantities from 1 pcs - 0.23 USDGross price for quantities from 1 pcs - 0.23 USD
Net price for quantities from 10 pcs - 0.21 USDGross price for quantities from 10 pcs - 0.21 USD
Net price for quantities from 100 pcs - 0.12 USDGross price for quantities from 100 pcs - 0.12 USD
Net price for quantities from 200 pcs - 0.11 USDGross price for quantities from 200 pcs - 0.11 USD
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Net price for quantities from 500 pcs - 0.09 USDGross price for quantities from 500 pcs - 0.09 USD
14629 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; SMD; Ch: 1; OUT: transistor; Uinsul: 3.75kV; Uce: 35V
Manufacturer part number: LTV-357T
Manufacturer: LITEON
Net price for quantities from 1 pcs - 0.29 USDGross price for quantities from 1 pcs - 0.29 USD
Net price for quantities from 10 pcs - 0.20 USDGross price for quantities from 10 pcs - 0.20 USD
Net price for quantities from 100 pcs - 0.13 USDGross price for quantities from 100 pcs - 0.13 USD
Net price for quantities from 300 pcs - 0.11 USDGross price for quantities from 300 pcs - 0.11 USD
Net price for quantities from 500 pcs - 0.09 USDGross price for quantities from 500 pcs - 0.09 USD
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23013 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; THT; Ch: 4; OUT: transistor; Uinsul: 5kV; Uce: 35V; DIP16
Manufacturer part number: LTV-847
Manufacturer: LITEON
Net price for quantities from 1 pcs - 1.02 USDGross price for quantities from 1 pcs - 1.02 USD
Net price for quantities from 10 pcs - 0.67 USDGross price for quantities from 10 pcs - 0.67 USD
Net price for quantities from 25 pcs - 0.59 USDGross price for quantities from 25 pcs - 0.59 USD
Net price for quantities from 100 pcs - 0.49 USDGross price for quantities from 100 pcs - 0.49 USD
Net price for quantities from 500 pcs - 0.39 USDGross price for quantities from 500 pcs - 0.39 USD
Net price for quantities from 1000 pcs - 0.37 USDGross price for quantities from 1000 pcs - 0.37 USD
Net price for quantities from 2500 pcs - 0.34 USDGross price for quantities from 2500 pcs - 0.34 USD
Net price for quantities from 10000 pcs - 0.31 USDGross price for quantities from 10000 pcs - 0.31 USD
5556 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; THT; Ch: 1; OUT: transistor; Uinsul: 5kV; Uce: 80V; DIP4
Manufacturer part number: PC817X3CSZ9F
Manufacturer: SHARP
Net price for quantities from 2 pcs - 0.36 USDGross price for quantities from 2 pcs - 0.36 USD
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0 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; THT; Ch: 1; OUT: transistor; Uinsul: 5kV; Uce: 80V; DIP4
Manufacturer part number: PC817X1NSZ1B
Manufacturer: SHARP
Net price for quantities from 2 pcs - 0.49 USDGross price for quantities from 2 pcs - 0.49 USD
Net price for quantities from 10 pcs - 0.25 USDGross price for quantities from 10 pcs - 0.25 USD
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Net price for quantities from 1000 pcs - 0.17 USDGross price for quantities from 1000 pcs - 0.17 USD
9322 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; THT; Ch: 1; OUT: transistor; Uinsul: 5kV; Uce: 80V; DIP4
Manufacturer part number: LTV-816
Manufacturer: LITEON
Net price for quantities from 1 pcs - 0.26 USDGross price for quantities from 1 pcs - 0.26 USD
Net price for quantities from 100 pcs - 0.12 USDGross price for quantities from 100 pcs - 0.12 USD
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14414 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; THT; Ch: 1; OUT: transistor; Uinsul: 5kV; Uce: 80V; DIP4
Manufacturer part number: PC817X2CSZ9F
Manufacturer: SHARP
Net price for quantities from 2 pcs - 0.36 USDGross price for quantities from 2 pcs - 0.36 USD
Net price for quantities from 10 pcs - 0.14 USDGross price for quantities from 10 pcs - 0.14 USD
Net price for quantities from 50 pcs - 0.12 USDGross price for quantities from 50 pcs - 0.12 USD
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Net price for quantities from 1000 pcs - 0.09 USDGross price for quantities from 1000 pcs - 0.09 USD
7388 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; SMD; Ch: 1; OUT: transistor; Uinsul: 3.75kV; Uce: 80V
Manufacturer part number: ACPL-217-500E
Manufacturer: BROADCOM (AVAGO)
Net price for quantities from 1 pcs - 0.54 USDGross price for quantities from 1 pcs - 0.54 USD
Net price for quantities from 5 pcs - 0.44 USDGross price for quantities from 5 pcs - 0.44 USD
Net price for quantities from 10 pcs - 0.40 USDGross price for quantities from 10 pcs - 0.40 USD
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Net price for quantities from 100 pcs - 0.30 USDGross price for quantities from 100 pcs - 0.30 USD
Net price for quantities from 500 pcs - 0.26 USDGross price for quantities from 500 pcs - 0.26 USD
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26703 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; SMD; Ch: 2; OUT: transistor; Uinsul: 4kV; Uce: 70V; SO8
Manufacturer part number: ILD206T
Manufacturer: VISHAY
Net price for quantities from 1 pcs - 1.12 USDGross price for quantities from 1 pcs - 1.12 USD
Net price for quantities from 10 pcs - 0.88 USDGross price for quantities from 10 pcs - 0.88 USD
Net price for quantities from 25 pcs - 0.79 USDGross price for quantities from 25 pcs - 0.79 USD
Net price for quantities from 50 pcs - 0.72 USDGross price for quantities from 50 pcs - 0.72 USD
Net price for quantities from 100 pcs - 0.65 USDGross price for quantities from 100 pcs - 0.65 USD
Net price for quantities from 500 pcs - 0.48 USDGross price for quantities from 500 pcs - 0.48 USD
Net price for quantities from 1000 pcs - 0.44 USDGross price for quantities from 1000 pcs - 0.44 USD
Net price for quantities from 2000 pcs - 0.42 USDGross price for quantities from 2000 pcs - 0.42 USD
9195 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; THT; Ch: 1; OUT: transistor; Uinsul: 5kV; Uce: 80V; DIP4
Manufacturer part number: PC817X2NSZ1B
Manufacturer: SHARP
Net price for quantities from 1 pcs - 0.58 USDGross price for quantities from 1 pcs - 0.58 USD
Net price for quantities from 10 pcs - 0.30 USDGross price for quantities from 10 pcs - 0.30 USD
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Net price for quantities from 300 pcs - 0.22 USDGross price for quantities from 300 pcs - 0.22 USD
Net price for quantities from 1000 pcs - 0.20 USDGross price for quantities from 1000 pcs - 0.20 USD
0 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; SMD; Ch: 4; OUT: transistor; Uinsul: 8kV; Uce: 70V; SO16
Manufacturer part number: TCMT4100
Manufacturer: VISHAY
Net price for quantities from 1 pcs - 1.54 USDGross price for quantities from 1 pcs - 1.54 USD
Net price for quantities from 5 pcs - 0.99 USDGross price for quantities from 5 pcs - 0.99 USD
Net price for quantities from 10 pcs - 0.93 USDGross price for quantities from 10 pcs - 0.93 USD
Net price for quantities from 25 pcs - 0.87 USDGross price for quantities from 25 pcs - 0.87 USD
Net price for quantities from 50 pcs - 0.83 USDGross price for quantities from 50 pcs - 0.83 USD
Net price for quantities from 100 pcs - 0.78 USDGross price for quantities from 100 pcs - 0.78 USD
Net price for quantities from 500 pcs - 0.71 USDGross price for quantities from 500 pcs - 0.71 USD
10085 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; SMD; Ch: 1; OUT: transistor; Uinsul: 5kV; Uce: 35V; reel
Manufacturer part number: LTV-817S-TA1-C
Manufacturer: LITEON
Net price for quantities from 1 pcs - 0.38 USDGross price for quantities from 1 pcs - 0.38 USD
Net price for quantities from 10 pcs - 0.25 USDGross price for quantities from 10 pcs - 0.25 USD
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Net price for quantities from 300 pcs - 0.11 USDGross price for quantities from 300 pcs - 0.11 USD
Net price for quantities from 500 pcs - 0.09 USDGross price for quantities from 500 pcs - 0.09 USD
Net price for quantities from 1000 pcs - 0.08 USDGross price for quantities from 1000 pcs - 0.08 USD
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0 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; THT; Ch: 1; OUT: transistor; Uinsul: 3.55kV; Uce: 30V
Manufacturer part number: 4N35
Manufacturer: LITEON
Net price for quantities from 1 pcs - 0.36 USDGross price for quantities from 1 pcs - 0.36 USD
Net price for quantities from 10 pcs - 0.14 USDGross price for quantities from 10 pcs - 0.14 USD
Net price for quantities from 25 pcs - 0.12 USDGross price for quantities from 25 pcs - 0.12 USD
Net price for quantities from 65 pcs - 0.11 USDGross price for quantities from 65 pcs - 0.11 USD
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0 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; SMD; Ch: 4; OUT: transistor; Uinsul: 3.75kV; Uce: 80V
Manufacturer part number: LTV-247
Manufacturer: LITEON
Net price for quantities from 1 pcs - 1.04 USDGross price for quantities from 1 pcs - 1.04 USD
Net price for quantities from 10 pcs - 0.73 USDGross price for quantities from 10 pcs - 0.73 USD
Net price for quantities from 100 pcs - 0.55 USDGross price for quantities from 100 pcs - 0.55 USD
Net price for quantities from 500 pcs - 0.43 USDGross price for quantities from 500 pcs - 0.43 USD
Net price for quantities from 750 pcs - 0.40 USDGross price for quantities from 750 pcs - 0.40 USD
Net price for quantities from 1000 pcs - 0.38 USDGross price for quantities from 1000 pcs - 0.38 USD
Net price for quantities from 1500 pcs - 0.36 USDGross price for quantities from 1500 pcs - 0.36 USD
Net price for quantities from 2000 pcs - 0.36 USDGross price for quantities from 2000 pcs - 0.36 USD
9254 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; SMD; Ch: 1; OUT: Darlington; Uinsul: 5kV; Uce: 35V
Manufacturer part number: LTV-815S-TA1
Manufacturer: LITEON
Net price for quantities from 1 pcs - 0.44 USDGross price for quantities from 1 pcs - 0.44 USD
Net price for quantities from 10 pcs - 0.32 USDGross price for quantities from 10 pcs - 0.32 USD
Net price for quantities from 100 pcs - 0.22 USDGross price for quantities from 100 pcs - 0.22 USD
Net price for quantities from 500 pcs - 0.16 USDGross price for quantities from 500 pcs - 0.16 USD
Net price for quantities from 1000 pcs - 0.14 USDGross price for quantities from 1000 pcs - 0.14 USD
Net price for quantities from 2000 pcs - 0.11 USDGross price for quantities from 2000 pcs - 0.11 USD
Net price for quantities from 3000 pcs - 0.11 USDGross price for quantities from 3000 pcs - 0.11 USD
4965 in TME stock
No. of pieces (Multiplicity: 1)
Optocoupler; SMD; Ch: 1; OUT: transistor; Uinsul: 5kV; Uce: 35V; reel
Manufacturer part number: LTV-817S-TA1
Manufacturer: LITEON
Net price for quantities from 1 pcs - 0.26 USDGross price for quantities from 1 pcs - 0.26 USD
Net price for quantities from 100 pcs - 0.08 USDGross price for quantities from 100 pcs - 0.08 USD
Net price for quantities from 500 pcs - 0.08 USDGross price for quantities from 500 pcs - 0.08 USD
Net price for quantities from 1000 pcs - 0.07 USDGross price for quantities from 1000 pcs - 0.07 USD
18536 in TME stock
No. of pieces (Multiplicity: 1)