# Transistors

> Bipolar transistors and MOSFETs (IRF, IRLB, TIP, BC547, 2N3055) plus MOSFET switch modules and assorted kits.

- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Category page: https://sigmanortec.ro/en/transistors
- Category: Electronic components > Transistors
- Prices: RON, VAT included; prices and stock as of 2026-10-22 01:32 (Europe/Bucharest)

## Subcategories

- [MOSFETs](https://sigmanortec.ro/en/llms/c/212.md): MOSFET transistors (IRF540N, IRF3205, IRLB3034, etc.) and power switching modules for motors, 3D printers (18 products)

## Products (24)

### TO-92 transistor set kit, 600 pieces, 15 values
- Page: https://sigmanortec.ro/en/to-92-transistor-set-kit-600-pieces-15-values
- Details: https://sigmanortec.ro/en/llms/p/285.md
- Price: 53.40 RON
- Availability: In stock; 1-2 zile
- Reference: 33202 · EAN: 5949516791482

Set of 600 TO-92 transistors in 15 common NPN and PNP values, 40 pieces each: 2N2222, 2N3904, 2N3906, 2N5401, 2N5551, A1015, C1815, C945, S8050, S8550, S9012, S9013, S9014, S9015, S9018. Sorted by type for quick identification, useful for prototyping, repairs, and switching and amplification circuits.

### MOSFET HEXFET IRLB3034PBF IRLB3034
- Page: https://sigmanortec.ro/en/mosfet-hexfet-irlb3034pbf-irlb3034
- Details: https://sigmanortec.ro/en/llms/p/469.md
- Price: 5.90 RON
- Availability: In stock; 1-2 zile
- Reference: 22060 · EAN: 5945756334472

The HEXFET MOSFET IRLB3034PBF (IRLB3034) is a power transistor for fast switching in DC applications, suited for converters, switching power supplies and motor control. It offers very low Rds(on) for reduced losses, supports high current, has logic-level gate drive for direct operation from drivers or microcontrollers, and comes in a TO-220 package easy to mount on a heatsink.

### Original IRF540N MOSFET
- Page: https://sigmanortec.ro/en/original-irf540n-mosfet
- Details: https://sigmanortec.ro/en/llms/p/470.md
- Price: 7.10 RON
- Availability: In stock; 1-2 zile
- Reference: 33034 · EAN: 5948351367012
- Specifications: Nominal Current: 33 A

Original IRF540N MOSFET manufactured by Infineon Technologies, in a TO-220 package. Drain-source voltage Vds 100V, maximum current Id 33A, continuous drain current 27A, Rds(on) tested at Vgs 10V, typical threshold voltage Vgs 4V. Suitable for fast switching and load control in power supplies, converters and motor drivers.

### MosFet STP55NF06 P55NF06
- Page: https://sigmanortec.ro/en/mosfet-stp55nf06-p55nf06
- Details: https://sigmanortec.ro/en/llms/p/473.md
- Price: 5.87 RON
- Availability: In stock; 1-2 zile
- Reference: 33045 · EAN: 5949392107933
- Specifications: Nominal Current: 50 A

N-channel power MOSFET STP55NF06 (P55NF06) for fast switching in switching power supplies, motor drivers and automotive applications. Supports a voltage of 60V and a rated current of 50A. Features a low Rds(on) resistance, reducing losses and improving efficiency. The TO-220 package allows easy mounting and efficient heat dissipation, suitable for safe control of inductive and resistive loads.

### N-Mosfet LR2905Z, 55V, 42A
- Page: https://sigmanortec.ro/en/n-mosfet-lr2905z-55v-42a
- Details: https://sigmanortec.ro/en/llms/p/493.md
- Price: 3.63 RON
- Availability: In stock; 1-2 zile
- Reference: 33431 · EAN: 5941186191074
- Specifications: Nominal Current: 42 A; Maximum Input Voltage: 55

N-channel MOSFET (LR2905Z / ILRL2905Z) for switching in power supplies, motor drivers and DC converters. Vds voltage 55 V, continuous drain current Id 42 A, power dissipation 110 W, low Rds(on) at Vgs 10 V, threshold voltage Vgs 2 V, maximum operating temperature 175°C. TO-252 package with 3 pins, MSL 1.

### IRF3205 transistor
- Page: https://sigmanortec.ro/en/irf3205-transistor
- Details: https://sigmanortec.ro/en/llms/p/777.md
- Price: 4.27 RON
- Availability: In stock; 1-2 zile
- Reference: 33038 · EAN: 5942480842334

IRF3205 transistor, a power MOSFET in a TO-220 package, used for efficient switching of loads in power supplies, converters and motor control. Supports a Drain-Source voltage of 55 V and a continuous current of 98 A, with an Rds(on) of 8 mOhms and a Gate-Source voltage up to 20 V. Reference 33038.

### IRF510 transistor
- Page: https://sigmanortec.ro/en/irf510-transistor
- Details: https://sigmanortec.ro/en/llms/p/778.md
- Price: 3.98 RON
- Availability: In stock; 1-2 zile
- Reference: 33032 · EAN: 5943088321252
- Specifications: Nominal Current: 5.6 A

IRF510 transistor, an N-channel MOSFET in a TO-220 package, rated for 100 V and a nominal current of 5.6 A. It offers fast gate control, low losses and stable operation, suitable for switching loads in power projects and audio applications as well as in amplification circuits.

### IRF520 transistor
- Page: https://sigmanortec.ro/en/irf520-transistor
- Details: https://sigmanortec.ro/en/llms/p/779.md
- Price: 3.63 RON
- Availability: In stock; 1-2 zile
- Reference: 33033 · EAN: 5943366896250
- Specifications: Nominal Current: 9.2 A

IRF520 transistor, a power MOSFET in a TO-220 package, for switching and control on lines up to 100V and 10A. Rated current 9.2 A. The terminals are base (activation trigger), collector (connected to the load) and emitter (connected to ground). Suitable for relays, DC motors and LED strips, easy to mount on a heatsink.

### Transistor IRF640 IRF640N
- Page: https://sigmanortec.ro/en/transistor-irf640-irf640n
- Details: https://sigmanortec.ro/en/llms/p/782.md
- Price: 3.63 RON
- Availability: In stock; 1-2 zile
- Reference: 33035 · EAN: 5944886454906
- Specifications: Nominal Current: 18 A

Power MOSFET transistor IRF640/IRF640N in TO220 package, used for switching and control in switch-mode power supplies, converters and industrial applications. Drain-source voltage Vds 200V, continuous drain current Id 18A, gate threshold Vgs max 4V, gate drive at Vgs 10V for low Rds on.

### IRF740 transistor, compatible
- Page: https://sigmanortec.ro/en/irf740-transistor-compatible
- Details: https://sigmanortec.ro/en/llms/p/784.md
- Price: 4.24 RON
- Availability: In stock; 1-2 zile
- Reference: 33036 · EAN: 5942987511948
- Specifications: Nominal Current: 10 A

MOSFET transistor compatible with IRF740, TO-220 package. Specifications: Vds 400V, continuous drain current Id 10A, Vgs 20V. A cheaper alternative suited for repairs and low budget projects in switching power supplies, inverters or load control.

### Transistor IRF830, N-CH, 500V
- Page: https://sigmanortec.ro/en/transistor-irf830-n-ch-500v
- Details: https://sigmanortec.ro/en/llms/p/785.md
- Price: 3.63 RON
- Availability: In stock; 1-2 zile
- Reference: 33522 · EAN: 5946297247993

IRF830 transistor, N-Channel MOSFET with VDS 500V, in TO-220 package. It is intended for switching in switch-mode power supplies, inverters and industrial applications, offering low losses and fast switching. The TO-220 package allows easy heatsink mounting for efficient heat dissipation. Suitable for power projects and electronics repairs.

### IRF840 transistor
- Page: https://sigmanortec.ro/en/irf840-transistor
- Details: https://sigmanortec.ro/en/llms/p/786.md
- Price: 4.24 RON
- Availability: In stock; 1-2 zile
- Reference: 33037 · EAN: 5941107377273

IRF840 power MOSFET transistor in a TO-220 package, designed for switching and controlling high-voltage loads. It offers 500 V drain-source voltage, a continuous current of 8 A, an Rds(on) resistance of 0.85 ohms (850 mOhms) and a maximum Vgs of 20 V. Suitable for switching power supplies, inverters and converters.

### NPN transistor, 2N3055, bipolar, TO-3, 15A, 60V
- Page: https://sigmanortec.ro/en/npn-transistor-2n3055-bipolar-to-3-15a-60v
- Details: https://sigmanortec.ro/en/llms/p/787.md
- Price: 7.02 RON
- Availability: In stock; 1-2 zile
- Reference: 33386 · EAN: 5945006225796
- Specifications: Nominal Current: 15 A

Bipolar NPN transistor 2N3055 from STMicroelectronics, in a TO-3 package with THT mounting. Collector current up to 15A, maximum voltage 60V and power dissipation of 117W. Mainly used in output stages of audio amplifiers and in power supplies.

### NPN transistor BC547 TO-92
- Page: https://sigmanortec.ro/en/npn-transistor-bc547-to-92
- Details: https://sigmanortec.ro/en/llms/p/788.md
- Price: 1.21 RON
- Availability: In stock; 1-2 zile
- Reference: 22201 · EAN: 5941268246197

NPN transistor BC547 in TO-92 package, used for amplification and switching in electronic circuits. Collector current up to 100 mA, maximum voltage 45 V, good gain for small signals and low consumption. Suitable for power supplies, preamplifiers, oscillators and relay control with small loads.

### NPN transistor, TIP31, TO220
- Page: https://sigmanortec.ro/en/npn-transistor-tip31-to220
- Details: https://sigmanortec.ro/en/llms/p/789.md
- Price: 2.42 RON
- Availability: In stock; 1-2 zile
- Reference: 22141 · EAN: 5946634444382

NPN power transistor TIP31 (TIP31C), in TO220 package for easy mounting and good heat dissipation. Supports a maximum Collector-Emitter voltage of 100V and a maximum Collector current of 3A DC. The base acts as an activation trigger, with a maximum voltage of 5V and maximum current of 1A DC. Used for switching loads, power supplies, relays, motors and simple amplification.

### PNP transistor, TIP32C, TO-220, 100V, 3A
- Page: https://sigmanortec.ro/en/pnp-transistor-tip32c-to-220-100v-3a
- Details: https://sigmanortec.ro/en/llms/p/955.md
- Price: 2.52 RON
- Availability: In stock; 1-2 zile
- Reference: 9144 · EAN: 5945346317014

PNP transistor TIP32C in a TO-220 package, with a maximum voltage of 100V and a current of 3A. Suitable for switching and amplification in power supplies, converters and audio output stages. The TO-220 package allows efficient heat dissipation and easy mounting on a heatsink, providing good stability in power applications.

### Power MOSFET, STP110N8F6, 80V, 110A, TO-220
- Page: https://sigmanortec.ro/en/power-mosfet-stp110n8f6-80v-110a-to-220
- Details: https://sigmanortec.ro/en/llms/p/1400.md
- Price: 8.25 RON
- Availability: In stock; 1-2 zile
- Reference: 9294 · EAN: 5942807348389
- Condition: Refurbished
- Specifications: Nominal Current: 110 A

N-channel power MOSFET, STP110N8F6, manufactured by STMicroelectronics, in a TO-220 package. Supports a Vdss of 80V and a maximum current of 110A (Tc), with a maximum power dissipation of 200W. Intended for fast, efficient switching in switching power supplies, DC-DC converters and motor control; the TO-220 package allows easy heatsink mounting.

### SMD Transistors Book Set, SOT-23, 1500 pieces, 60 values
- Page: https://sigmanortec.ro/en/smd-transistors-book-set-sot-23-1500-pieces-60-values
- Details: https://sigmanortec.ro/en/llms/p/2097.md
- Price: 253.97 RON
- Availability: In stock; 1-2 zile
- Reference: 9929 · EAN: 5946965569150

Set of 1500 SMD components in SOT-23 package, organized in a folder with 60 different types, 25 pieces each. Includes NPN and PNP bipolar transistors (e.g. MMBT3904, MMBT3906, S9012, S9013, 2SC1815, 2SA1015), MOSFETs (2N7002, SI2301, SI2302), Schottky diodes (BAS16, BAT54) and the TL431 voltage regulator. Each compartment is labeled. Folder dimensions: 190 x 135 x 35mm.

### High-power MOSFET switch module, 100V 300A, 5–18V control
- Page: https://sigmanortec.ro/en/high-power-mosfet-switch-module-100v-300a-518v-control
- Details: https://sigmanortec.ro/en/llms/p/2451.md
- Price: 10.78 RON
- Availability: In stock; 1-2 zile
- Reference: 88273 · EAN: 5943419070842
- Specifications: Maximum Input Voltage: 100 V; Maximum Output Current: 300 A; Control voltage: 5 - 18 V

Switch high-power DC loads quickly and directly from a logic or PWM signal, without mechanical relays, supporting up to 100V and 300A peaks. Based on the AOTL66912 MOSFET with very low on-resistance for reduced losses, it is driven at 5–18V, ideally 10–12V at high currents, low-side, on an ultra-compact 14x15mm board.
The MOSFET power transistor switch module is a compact solution for controlling high-current DC loads. It is intended for electronics enthusiasts and engineers who want to turn motors, LED strips, and other power consumers on, off, or adjust them directly from a microcontroller, without mechanical relays and without moving parts.

### IRF540N module, 4 channels, 5V
- Page: https://sigmanortec.ro/en/irf540n-module-4-channels-5v
- Details: https://sigmanortec.ro/en/llms/p/2253.md
- Price: 23.80 RON
- Availability: In stock; 1-2 zile
- Reference: 88090 · EAN: 5943387389915
- Specifications: Input Voltage: 5 V; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

4-channel IRF540N MOSFET module for switching DC loads (LED strips, motors, electronic modules), compatible with Arduino and other boards. Supply 5VDC, logic signal 3.3-5V, activated on HIGH. Optical isolation PS2801-4 with common GND, status LED per channel. Supports up to 100V and 10A per channel. Dimensions 66 x 66mm. Not suitable for AC circuits.

### E-Switch mosfet module, 3-12V control, 5-36V output, with optoisolator
- Page: https://sigmanortec.ro/en/e-switch-mosfet-module-3-12v-control-5-36v-output-with-optoisolator
- Details: https://sigmanortec.ro/en/llms/p/1628.md
- Price: 20.58 RON
- Availability: In stock; 1-2 zile
- Reference: 9513 · EAN: 5940572857129
- Specifications: Supply Voltage: 3; Maximum Input Voltage: 12; Minimum Output Voltage: 5; Maximum Output Voltage: 36; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.; Output Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

E-Switch MOSFET module with optoisolator for PWM control of LED strips, DC motors and other loads via Arduino or other microcontrollers. Control voltage 3-12VDC, output voltage 5-36VDC, maximum current 5A standard, 22A with active cooling. 2.54mm pins compatible with DuPont connectors. Dimensions 42 x 26mm. Reference 9513.

### Power Mosfet Module, 3D Printers, 12-24V, 25A
- Page: https://sigmanortec.ro/en/power-mosfet-module-3d-printers-12-24v-25a
- Details: https://sigmanortec.ro/en/llms/p/940.md
- Price: 19.07 RON
- Availability: In stock; 1-2 zile
- Reference: 9129 · EAN: 5940092130757
- Specifications: Supply Voltage: 12; Maximum Input Voltage: 24; Maximum Output Current: 25; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

Allows control of the 3D printer heated bed from the motherboard signal, but with a stronger external power supply, reducing the stress and temperature of the board and extending its lifespan. Operates at 12-24VDC, supports up to 25A, is compatible with PID control, compact dimensions 50x60 mm for easy installation.
External power mosfet for 3D printers, 12VDC or 24VDC voltage, 25A maximum.
This transistor module is specially used for the heated bed of the 3D printer to power it from a more powerful external source. In this way, the bed will still receive a signal from the printer's motherboard, but it will be powered externally.

### IRF520 module
- Page: https://sigmanortec.ro/en/irf520-module
- Details: https://sigmanortec.ro/en/llms/p/400.md
- Price: 7.97 RON
- Availability: In stock; 1-2 zile
- Reference: 33264 · EAN: 5940242137438

IRF520 module with MOSFET, compatible with Arduino and other development boards. Allows PWM control of DC loads such as LED strips, power LEDs or motors. Control signal 3.3-5VDC, load voltage 0-24VDC, current under 5A; above 1A a heatsink is required for the mosfet.

### Dual power MOSFET module, 15A, 400W
- Page: https://sigmanortec.ro/en/dual-power-mosfet-module-15a-400w
- Details: https://sigmanortec.ro/en/llms/p/373.md
- Price: 2.83 RON
- Availability: In stock; 1-2 zile
- Reference: 33540 · EAN: 5949619964035
- Specifications: Power: Over 20W; Maximum Output Current: 15 A; Maximum Controlled Power: 400 W

Dual power MOSFET module (33540) with FDD8782 N-Channel transistors, RDS(on) 14.0mΩ at Vgs=4.5V, max VDS 25V. Supports 15A continuous, peaks up to 30A, dissipation up to 400W with adequate cooling. Digital or PWM control 3.3-20V, frequency 0-20kHz. Recommended for applications up to 24VDC: DC motors, LED strips, electromagnets. Dimensions: 34 x 17 x 12 mm.