Over 15 years

professional experience

Easy returns

up to 30 days

Over 1 000 000

shipped orders

Fast shipping

all across the EU

Next shipment on Monday

Wishlist

0,8mm nozzle for Elegoo Neptune 4 Plus/4 Max 3D printers - 1,75mm filament - brass

Index: ELG-26889

Forest animal repeller - wild boars, deer, birds - IP44 - Viano

Index: VIA-27229

Battery-powered carbon monoxide detector - Zamel CTW-07

Index: ZML-27589

Bondhus Allen Key Set - 1,5-10mm - 9 pcs.

Index: LUK-27629

Module with recessed USB Type-C socket - connector for contact plate - Adafruit 6050

Index: ADA-26728

LV electrolytic capacitor set - justPi - 120 pcs.

Index: JUS-24681

Pakiet filamentów ze szpulami Bambu Lab - StartPack Premium PLA - 4szt.

Index: BML-27762

New
Reduced price
Pack
Sale

Limit switch 50mm - Pololu 1403

Index: PLL-00017

All new products

Traffic HAT - shield with diodes for Raspberry Pi

Traffic HAT - LED module with for Raspberry Pi

Index: SUP-13471

Sale
Sale

Universal stand for Elbert v2

Index: FOR-10271

Sale
Sale

Step-Down Voltage Regulator D24V6F5 - 5V 0,6A - Pololu 2107

Index: PLL-01349

Intelligent PIR motion and light intensity sensor LoRaWAN - Milesight WS202

Index: STV-27006

Reduced price
Sale

Rebel RB-1002 20V 2A Impact Driver with accessories

Index: LEC-18021

Sale
Sale

Laser Engraving Kit - kit for UltraArm P340 - Elephant Robotics

Index: ELP-22782

Sale
Sale

Circuit Playground, Express - Base KIT compatible with Arduino and Code.org - Adafruit...

Index: ADA-10000

Sale
Sale

Genibot - Pre-school education with Genibot - part I - Anna Świć

Index: OZB-18694

Reduced price
Sale

AVR microcontroller - ATmega88PA-AU SMD

Index: UCC-01053

Sale
Sale

Photon Phrase Set - basic

Index: MBE-19533

Sale
Sale

Adafruit Trinket M0 Microcontroller - CircuitPython and Arduino IDE

Trinket M0 Microcontroller - CircuitPython and Arduino IDE - Adafruit 3500

Index: ADA-10873

Reduced price
Sale

All promotion products

Fototranzystory - Elementy optoelektroniczne

Semiconductor elements have played a huge role in shaping modern electronic systems. First bipolar transistor was invented in the first half of the 20th century. The bipolar transistor is made of three semiconductor layers with different types of conductivity (p-n-p or n-p-n), which results in two types of bipolar transistors - PNP and NPN. The individual layers have their names: E - emitter, B - base, C - collector. The basis of the use of the transistor is the dependence of the value of the greater current flowing between the emitter-collector junction, on the changes in the value of the lower current flowing in the base-emitter junction.

Expand... Collapse...

Sort by:

Quantity:

Products: 4

Phototransistor 940nm - L-53P3C

Phototransistor in the case of 5 mm. Maximum sensitivity for the wave with the length of 940 nm. The reading angle is 30 °. Transparent lens.

5.0 (4)

Index: UCC-00271

Index: UCC-00271

Phototransistor TEPT4400 3mm 570nm

Phototransistor in the case of 3 mm. Maximum sensitivity for the wave with the length of 570 nm. The reading angle is 60 °. T ransparent lens.

5.0 (4)

Index: UCC-03866

Index: UCC-03866

Phototransistor TEFT4300 3mm 925nm

Phototransistor in the case of 3 mm. Maximum sensitivity for the wave with the length of 925 nm. The reading angle is 30 °. Darkened lens.

5.0 (1)

Index: UCC-00446

Index: UCC-00446

Discontinued product

Phototransistor SFH-313FA 5mm 870nm - 5 pcs

Phototransistor in the case of 5 mm. Maximum sensitivity for the wave with the length of 870 nm. Darkened lens. 5 pcs.

5.0 (2)

Index: UCC-04245

Index: UCC-04245

Phototransistors

Phototransistor in theory

Using the photoelectric properties of semiconductors, a modified version of transistors was invented - phototransistors. In phototransistors, the value of the current in the emitter-collector junction is controlled not by the base-emitter current, but by the intensity of light falling on this junction. Photons falling on the base-emitter junction polarize it in the forward direction, thus causing a current to flow in the emitter-collector junction, the value of which depends on the illumination intensity. In the off-light state, the transistor does not conduct current through the emitter-collector junction, which is equivalent to the off state. Due to the fact that there is no need to supply the base-emitter junction with electricity, phototransistors usually have only two terminals - the emitter and the collector. There are also phototransistors available where the base is connected and can be controlled like a regular bipolar transistor. The advantage of phototransistors over other photoelectric elements, such as photoresistors, is a much shorter switching/response time and much greater sensitivity.

Phototransistor parameters

If you want to correctly select phototransistors for your applications, use the manufacturer's current-voltage characteristics to determine the operating point of the phototransistor appropriate to your needs. An important parameter is the wavelength at which the phototransistor achieves maximum sensitivity. At Botland you will find phototransistors with maximum sensitivities for wavelengths of 570 nm, 870 nm, 925 nm, 940 nm, which covers visible and infrared radiation.

Application

Due to their very high sensitivity and speed of operation, phototransistors are used in radiation detection, where high dynamics of the system is required, therefore in high-speed measurement systems, as analog-to-digital converters, the systems are connected optoelectronically. You can use them as an optocoupler to exchange signals between two electronic systems. Check out the Botland offer and discover the possibilities of phototransistors!

Phototransistors - FAQ

What is a phototransistor used for?

A phototransistor is an optoelectronic element - the current value at the emitter-collector junction is controlled by the intensity of light that falls on the junction. These types of elements are used, for example, as optoisolators, thanks to which the signal is transmitted via light.

What do we call Phototransistor?

A phototransistor is a transistor that responds to changes in light intensity, which results in changes in current at the emitter-collector junction. In an ordinary transistor, such changes are influenced by the current at the base-emitter junction. In a phototransistor, photons that land on the base-emitter junction polarize it in the forward direction, thus allowing current to flow through the emitter-collector junction.

What are optoelectronic elements?

Optoelectronics are electronic components that use light - for example, they actively respond to light or can emit it themselves. Optoelectronic elements include, for example, displays and LEDs, photoresistors , phototransistors and photodiodes.