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Converters, Drivers and Others
98 results
Control and conversion integrated circuits: NE555 timers, ULN2003 Darlington drivers, IR2110 MOSFET drivers, UC384x and TL494 PWM controllers, A/D converters and serial interfaces.
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Choosing the right driver or controller
This family covers chips that control power or translate a signal. Start with the function: a timer such as the NE555 generates pulses and timing delays; a Darlington driver ULN2003 or ULN2803 drives relays, small motors or a stepper motor from a logic output; a MOSFET driver IR2110 or IR2111 drives the gate of a MOSFET or an IGBT, including the high side of a half-bridge; a PWM controller UC3842, UC3843, SG3525A or TL494 forms the core of a switch-mode power supply.
- Number of channels and current: ULN2003 with 7 channels versus ULN2803 with 8, with 500 mA or 700 mA versions depending on the reference.
- Operating voltage: a high-voltage half-bridge driver such as the IR21571 or L6386 does not have the same field of use as a low-voltage TC426.
- Package: DIP (through-hole) for breadboard prototyping and socket replacement, SOIC or SSOP (SMD) for a repaired board or manufacturing.
- Interface: MAX232 and ST485/MAX485 for RS-232 and RS-485, PCF8574 to expand inputs/outputs over I2C, ENC28J60 for Ethernet over SPI.
For display, TM1637, MAX7219 and LM3914 drive LEDs and 7-segment displays; HX711 and MAX6675 respectively convert a load cell and a type K thermocouple. The power components they control are found elsewhere; the rest of the chips are listed under Integrated circuits.
Frequently asked questions
What is the difference between ULN2003 and ULN2803 ?
The ULN2003 has 7 Darlington channels, the ULN2803 has 8, in a longer package. Also check the current rating given by the exact reference, 500 mA or 700 mA depending on the version, and the pinout, which differs between the two families.
Can a MOSFET be driven directly from an Arduino ?
For a power MOSFET switching fast or on the high side, no: a microcontroller output does not supply the current or gate voltage needed. A driver such as the IR2110 or TC426 charges and discharges the gate properly and prevents the transistor from overheating.
Which PWM controller to repair a switch-mode power supply ?
Replace with the same reference as the original: UC3842, UC3843, UC3844 and UC3845 look alike but differ in maximum duty cycle and start-up thresholds. TL494 and SG3525A are two-output controllers, used in other topologies.
Should the DIP or SMD version be chosen ?
DIP (through-hole) for a breadboard, a socket, or a perforated board. SOIC, SSOP or VQFN for soldering onto an existing board during a repair: match the original package so the pinout corresponds.
Why does the price vary so much from one chip to another ?
It depends on the function, the voltage and current handled, the manufacturer (Texas Instruments, Infineon, ONSEMI, STMicroelectronics…) and the package. A common interface chip and a high-voltage three-phase bridge driver are not in the same category.