The TL494 device incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application. The TL494 device contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.The TL494C device is characterized for operation from 0C to 70C. The TL494I device is characterized for operation from 40C to 85C.

ULN2004 Features

• Output current (single output): 500mA (MAX.)
• High sustaining voltage output: 50V (MIN.)
• Output clamp diodes
• Inputs compatible with various types of logic

• Wide supply voltage range 3.0V to 15V
• Low power 10 nW (typ.)
• High noise immunity 0.45 VDD (typ.)
• Buffered Inputs and Outputs
• Standard Symmetrical Output Characteristics
• 100% Tested for Maximum Quiescent Current at 20V
• 5V, 10V and 15V Parametric Ratings
• Maximum Input Current of 1A at 18V Over Full Package-Temperature Range; 100nA at 18V and +25oC

• Supply voltage ranges from 3v to 18v
• Set-up-time is 150, 70, and 40ns at 5v, 10v, and 15v respectively
• Strobe pulse width is 400, 160, and 100ns at 5v, 10v, and 15v respectively
• Hold time is zero
• 100% tested for quiescent current at 20v
• Having high input current of 1uA (max.) at 18v
• Maximum output current sourcing of 25mA
• Operating temperature ranges from -40 C to 85 C
• Storage temperature ranges from -65 C to 150 C

The Exclusive OR gates are monolithic complementary MOS (CMOS) integrated circuits constructed with N-Channel and P-Channel enhancement mode transistors. All inputs are protected against static discharge with diodes to VDD and VSS.

• Wide supply voltage range: 3V to 15V
• Low power: 100 nW (typ.)
• High noise immunity: 0.45 VDD (typ.)
• Separate SET and RESET inputs for each latch
• NOR and NAND configuration
• 3-STATE output with common output enable

The 4077 is a quad 2-input EXCLUSIVE-NOR gate. The outputs are fully buffered for the highest noise immunity and pattern insensitivity to output impedance. The 4077 operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually ground). Unused inputs must be connected to VDD, VSS, or another input.

The BT139 is a TRIAC thyristor, which is a type of semiconductor device that can use to control alternating current (AC) power. TRIAC thyristor BT139 is a four-quadrant device, meaning that it can conduct current in either direction. The BT139 has a peak inverse voltage (PIV) of 800 volts and a current rating of 16 amperes. It is a sensitive gate triac, meaning that it can be triggered with a low gate current. The on-state voltage drop of the BT139 is 1.2 volts. Here are some of the key features of the BT139-800E 4 Quadrant TRIAC:

• Peak inverse voltage (PIV): 800 V
• RMS current: 16 A
• Gate trigger current: 2.5 mA
• Gate trigger voltage: 1.4 V
• On-state voltage drop: 1.2 V
• Thermal resistance: 1.2 K/W (junction to mounting base)
• Operating temperature range: -40 to 125 °C

74HC540 is a 20 Pin Octal 3-state Inverting Buffer IC having 2V to 6V Operating Voltage range with 6mA output current. The 3-STATE buffers utilize advanced silicon-gate CMOS technology. They possess high drive current outputs which enable high speed operation even when driving large bus capacitances.

• Inverting IC that can convert High logic level to Low level
• High source and Sink Current as it has the capability of driving 2 TTL Loads at 5V over full temperature range.
• 100% Tested for Quiescent Current at 20 V
• Maximum Input Current of 1A at 18 V Over Full Package Temperature Range; 100 nA at 18 V and 25C
• 5-V, 10-V, and 15-V Parametric Ratings
• It is available in 16 pin packages of PDIP, SOIC, TSSOP, SO.
• Special input protection to protect inputs against static discharges.

• CD4027 Dual JK Flip Flop Package IC which operates at medium speed of 16 MHz typically with 10V supply
• Voltage range of 3.0V to 15V
• Static Flip-Flop Operation
• High noise immunity of 0.45 VDD(typ.)
• Set and Reset capability
• TTL compatible
• Low power of 50 nW (typ.)
• Input Rise/Fall time at 5V: 45us
• Maximum and minimum Input Voltage is 2 V and 0.8 V

The CD4081 quad gate is a monolithic complementary MOS (CMOS) integrated circuit constructed with N- and P-channel enhancement mode transistors. They have equal source and sink current capabilities and conform to standard B series output drive. The devices also have buffered outputs which improve transfer characteristics by providing very high gain. All inputs protected against static discharge with diodes to VDD and VSS.

• Dual Input IC with 4 OR Gates with an operating voltage range from 3V to 18V
• Fully Static and Medium Speed Operation: with tPHL, tPLH = 60ns (typ) at 10V
• DC input current: 10mA
• High-Voltage Type (20V Rating)
• Power Dissipation: 500mW
• Maximum propagation delay is 250ns.
• Standard symmetric output
• Minimum logic Low and High voltage @+5V is1.5V and 3.5V
• Maximum Transition Time is 200ns