NE555 SMD Precision Timing Circuit

Precision timing circuit for accurate time delays or oscillation.

• Timing: From microseconds to hours
• Operation Modes: A stable or monostable
• Duty Cycle: Adjustable
• Output: TTL compatible, can source or sink up to 200 mA

The NE555 SMD devices are precision timing circuits capable of producing accurate time delays or oscillation. In the time delay or monostable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the a stable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor. The threshold and trigger levels normally are two-thirds and one-third, respectively, of VCC. These levels can be altered by use of the control-voltage terminal. When the trigger input falls below the trigger level, the flip-flop is set, and the output goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level, the flip-flop is reset and the output is low. The reset (RESET) input can override all other inputs and can be used to initiate a new timing cycle. When RESET goes low, the flip-flop is reset, and the output goes low. When the output is low, a low impedance path is provided between discharge (DISCH) and ground. The output circuit is capable of sinking or sourcing current up to 200 mA. Operation is specified for supplies of 5V to 15V. With a 5-V supply, output levels are compatible with TTL inputs.

• Supply Voltage: 18V
• Input Voltage: VCC
• Output Current: 225mA
• Package Thermal Resistance Junction-to-Ambient: 130C/W
• Package Thermal Resistance Junction-to-Case: 15C/W
• Junction Temperature: 150C
• Storage Temperature: -65 to 150C

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*Images are for illustration only; actual product may vary.