# Interface and Logic Level Converters

> Modules for logic level shifting, I2C interfacing, current-to-voltage and optocoupled isolation between 3.3V, 5V, 12V

- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Category page: https://sigmanortec.ro/en/interface-and-logic-level-converters
- Category: Mechatronics and IoT > Adapters and Converters > Interface and Logic Level Converters
- Prices: RON, VAT included; prices and stock as of 2026-10-22 01:32 (Europe/Bucharest)

## Products (12)

### Logic level converter module, 3V3 IN, 5V OUT, Common Cathode, PNP
- Page: https://sigmanortec.ro/en/logic-level-converter-module-3v3-in-5v-out-common-cathode-pnp
- Details: https://sigmanortec.ro/en/llms/p/1639.md
- Price: 32.75 RON
- Availability: In stock; 1-2 zile
- Reference: 9524 · EAN: 5949566680071
- Specifications: Input Voltage: 3.3 V; Output Voltage: 5 V; 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.

Logic level converter module (ref. 9524), converts signals from 3.3V to 5V, with common cathode and PNP connection. It has 4 channels, optical isolation and switches up to 10 kHz. Requires a 5VDC supply on VCC/GND and connects via screw terminals. Compatible with Arduino and other development boards.

### Logic level converter module, 3V3 IN, 12V OUT, Common Cathode, PNP
- Page: https://sigmanortec.ro/en/logic-level-converter-module-3v3-in-12v-out-common-cathode-pnp
- Details: https://sigmanortec.ro/en/llms/p/1640.md
- Price: 30.19 RON
- Availability: In stock; 1-2 zile
- Reference: 9525 · EAN: 5949806820649
- Specifications: Input Voltage: 3.3 V; Output Voltage: 12 V; 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.

Logic level converter module with 4 channels, from 3.3V to 12V, optoisolated, PNP input with common cathode. Powered by 12VDC on VCC and GND, connection via screw terminal. Maximum switching frequency 10KHz. A High signal of 3.3V on the input corresponds to 12V on the output, while Low (0V) corresponds to 0V on the output. Compatible with Arduino and other development boards.

### Logic level converter module, 5V IN, 3V3 OUT, Common Cathode, PNP
- Page: https://sigmanortec.ro/en/logic-level-converter-module-5v-in-3v3-out-common-cathode-pnp
- Details: https://sigmanortec.ro/en/llms/p/1641.md
- Price: 30.19 RON
- Availability: In stock; 1-2 zile
- Reference: 9526 · EAN: 5941128083412
- Specifications: Input Voltage: 5 V; Output Voltage: 3.3 V; 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.

4-channel logic level converter module for adapting 5V signals to 3.3V, featuring optical isolation, common cathode PNP scheme and screw terminal connection. Stable switching up to 10kHz. Requires 3.3VDC supply on VCC and GND pins. Compatible with Arduino and other 3.3V development boards.

### Logic level converter module, 5V IN, 12V OUT, Common Cathode, PNP
- Page: https://sigmanortec.ro/en/logic-level-converter-module-5v-in-12v-out-common-cathode-pnp
- Details: https://sigmanortec.ro/en/llms/p/1642.md
- Price: 32.74 RON
- Availability: In stock; 1-2 zile
- Reference: 9527 · EAN: 5941212411008
- Specifications: Input Voltage: 5 V; Output Voltage: 12 V; 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.

Logic level converter module with 4 channels, converts 5V signals to 12V (DC), featuring optoisolation, common cathode PNP connection and screw terminals. Switches up to 10 kHz, requires 12VDC supply on VCC and GND, compatible with Arduino and other development boards. Used to drive relays, solenoid valves or industrial inputs.

### I2C IIC bidirectional logic level translator module 8 channels 3.3V 5V TXS0108E
- Page: https://sigmanortec.ro/en/i2c-iic-bidirectional-logic-level-translator-module-8-channels-33v-5v-txs0108e
- Details: https://sigmanortec.ro/en/llms/p/455.md
- Price: 5.69 RON
- Availability: In stock; 1-2 zile
- Reference: 33138 · EAN: 5945267532138
- Specifications: Supply Voltage: 3.3; Maximum Input Voltage: 5

Bidirectional 8-channel logic level translator module based on the TXS0108E (CJMCU 0108), used to interface boards and sensors with different logic levels over I2C IIC or GPIO lines. Automatically converts the signal between 3.3V and 5V, with no direction control needed. VCCA connects to 3.3V, VCCB to 5V, and GND is shared between the two supplies. Input voltage: 3.3V-5V.

### Logic Level Translator Module, I2C, IIC, bidirectional, 4 channels, 3.3-5V
- Page: https://sigmanortec.ro/en/logic-level-translator-module-i2c-iic-bidirectional-4-channels-33-5v
- Details: https://sigmanortec.ro/en/llms/p/454.md
- Price: 3.11 RON
- Availability: In stock; 1-2 zile
- Reference: 22200 · EAN: 5947638727310
- Specifications: Supply Voltage: 3.3; Maximum Input Voltage: 5

Bidirectional I2C/IIC logic level translator module with 4 channels, operating between 3.3V and 5V. Enables safe communication between devices with different logic levels, providing fast conversion between 5V and 3.3V. Compatible with Arduino and other development boards, compact and easy to integrate on breadboards or in industrial setups.

### Current to voltage converter module, 0-20mA to 0-10V
- Page: https://sigmanortec.ro/en/current-to-voltage-converter-module-0-20ma-to-0-10v
- Details: https://sigmanortec.ro/en/llms/p/2041.md
- Price: 12.75 RON
- Availability: In stock; 1-2 zile
- Reference: 9843 · EAN: 5943253369775
- Specifications: Minimum Output Voltage: 0; Maximum Output Voltage: 10; Output Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

Converts 0-20mA or 4-20mA current signal into selectable 0-3.3V, 0-5V or 0-10V voltage, ideal for industrial sensors and integration with Arduino or STM. Offers stable transmission over long distances, high-precision sampling resistor with low drift, fine calibration via ZERO and SPAN potentiometers, wide 7-36V power supply and reverse polarity protection.
Current-voltage conversion module, designed to convert the current signal of 0-20mA or 4-20mA into a variable voltage signal between 0-3.3V, 0-5V or 0-10V.

### Current to voltage converter module, 0-20mA to 0-5V, LM358
- Page: https://sigmanortec.ro/en/current-to-voltage-converter-module-0-20ma-to-0-5v-lm358
- Details: https://sigmanortec.ro/en/llms/p/974.md
- Price: 13.15 RON
- Availability: Out of stock
- Reference: 9163 · EAN: 5941154040731
- Specifications: Minimum Output Voltage: 0; Maximum Output Voltage: 5

Converts 0-20mA current signal into a proportional voltage 0-5V, ideal for interfacing industrial sensors with ADC inputs or microcontrollers. Uses LM358 for stable conversion, operates at 10-30V, includes potentiometer for precise output calibration, operates between -25 and 85C.
The module for converting current (IV) between 0 and 20mA to voltage between 0 and 5V. It converts a current into a proportional voltage.
For example, applying a current of 20mAh to the input will produce a voltage of 5VDC at the output, applying a current of 4mA will produce an output voltage of 1V. The potentiometer is used to adjust the output voltage.
Specifications:
Integrated: LM358
Supply voltage: 0-30V …

### TLP281 optocoupler module, 4 channels
- Page: https://sigmanortec.ro/en/tlp281-optocoupler-module-4-channels
- Details: https://sigmanortec.ro/en/llms/p/975.md
- Price: 9.11 RON
- Availability: In stock; 1-2 zile
- Reference: 9164 · EAN: 5947155375377

4-channel optocoupler module based on TLP281 (Toshiba), providing galvanic isolation between INPUT and OUTPUT. INPUT voltage 3V/5V, maximum HVCC voltage 24VDC, maximum current draw 500mAh, output current equal to HVCC/5.1K. Compatible with Arduino and other development boards, suitable for safely controlling motors, relays or servomotors. Dimensions 25 x 24mm, weight 5g.

### Logic level converter module, with optocoupler, 4 channels, PC817, 3.3-30V
- Page: https://sigmanortec.ro/en/logic-level-converter-module-with-optocoupler-4-channels-pc817-33-30v
- Details: https://sigmanortec.ro/en/llms/p/1679.md
- Price: 10.85 RON
- Availability: In stock; 1-2 zile
- Reference: 9566 · EAN: 5940106562659
- Specifications: Supply Voltage: 3.3 VDC; Maximum Input Voltage: 30 VDC; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

Logic level converter module with PC817 optocoupler, 4 independent channels, each with status LED and jumper for common ground or full isolation. Input voltage 3.3-24VDC, controlled output voltage 3.3-30VDC, maximum frequency 4KHz per channel, maximum current 50mA. Dimensions 48 x 38mm. Compatible with Arduino and other development boards, used for isolated control of relays and digital inputs.

### Signal converter 2IN, 4OUT, 4-20mA Input, 4-20mA Output, 24VDC
- Page: https://sigmanortec.ro/en/signal-converter-2in-4out-4-20ma-input-4-20ma-output-24vdc
- Details: https://sigmanortec.ro/en/llms/p/1975.md
- Price: 261.90 RON
- Availability: In stock; 1-2 zile
- Reference: 88012 · EAN: 5947531137094
- Specifications: Input Voltage: 24VDC; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

Industrial signal converter (ref. 88012) that distributes two analog 4-20mA signals to four isolated 4-20mA outputs (grouped in pairs). Powered by 24VDC, with galvanic isolation between input and output, accuracy 0.1% FS, response time 

### Adapter module for ESP-01, ESP8266, 5V/3.3V
- Page: https://sigmanortec.ro/en/adapter-module-for-esp-01-esp8266-5v-33v
- Details: https://sigmanortec.ro/en/llms/p/322.md
- Price: 10.14 RON
- Availability: In stock; 1-2 zile
- Reference: 33508 · EAN: 5940986046218

Allows quick connection of an ESP-01 ESP8266 to Arduino and other 5V logic boards, providing stable power supply through integrated 3.3V regulator and logic level conversion on the board. Operates at 4.5–5.5V DC input, supports current up to 240mA, ensures increased compatibility in IoT projects and prototyping through simple module assembly.
Adapter module for the ESP-01 WiFi board, ESP8266, with 5V power supply thanks to the presence on the board of a 3.3V voltage regulator (the operating voltage of the ESP-01), compatible with Arduino and other development boards.