SM4186, manufactured by TE Connectivity Ltd and distributed by Worldway Electronics. It’s category belong to Electronic Components ICs.
It is applied to many fields, like Communications equipment Wireless infrastructure Industrial Electronic point of sale (EPOS) Personal electronics PC & notebooks .
Additionally, it is green and compliant to RoHS (Lead free / RoHS Compliant).
For more information about SM-4186, please click here to get the SM-4186 Details PDF as well as its EDA/CAD SM-4186 PCB Footprint and Symbol.
Worldway strictly buy SM-4186 excess stock authorized and source from Franchise, so you can be rest assured order SM-4186 from Worldway. What’s more, Worldway offers 1 Year Worldway Guarantee Learn More to our customers who once purchased this part, to make sure that our customers have a wonderful purchasing experience and are willing to build a long-term relationship with Worldway.
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555 timer IC Overview
The 555 timer IC is an integrated circuit (chip) used in a variety of timer, delay, pulse generation, and oscillator applications. Derivatives provide two or four timing circuits in one package. It was commercialized in 1972 by Signetics and it was reported to still be in wide use as of 2013. Numerous companies have made the original bipolar timers and similar low-power CMOS timers too. In 2017, it was said over a billion 555 timers are produced annually by some estimates, and “probably the most popular integrated circuit ever made.
The timer IC was designed in 1971 by Hans Camenzind under contract to Signetics. In 1968, he was hired by Signetics to develop a phase-locked loop (PLL) IC. He designed an oscillator for PLLs such that the frequency did not depend on the power supply voltage or temperature. Signetics subsequently laid off half of its employees due to the 1970 recession, and development on the PLL was thus frozen.
Camenzind proposed the development of a universal circuit based on the oscillator for PLLs and asked that he develop it alone, borrowing equipment from Signetics instead of having his pay cut in half. Camenzind’s idea was originally rejected, since other engineers argued the product could be built from existing parts sold by the company; however, the marketing manager approved the idea.
The first design for the 555 was reviewed in the summer of 1971. Assessed to be without error, it proceeded to layout design. A few days later, Camenzind got the idea of using a direct resistance instead of a constant current source finding later that it worked. The change decreased the required 9 pins to 8 so the IC could be fit in an 8-pin package instead of a 14-pin package.
This revised design passed a second design review with the prototypes completed in October 1971 as the NE555V (plastic DIP) and SE555T (metal TO-5). The 9-pin copy had been already released by another company founded by an engineer who attended the first review and retired from Signetics; that firm withdrew its version soon after the 555 was released. The 555 timer was manufactured by 12 companies in 1972 and it became a best selling product
Several books report the name 555 comes from the three 5 kilohm resistors inside the chip. However, in a recorded interview with an online transistor museum curator, Hans Camenzind said “It was just arbitrarily chosen. It was Art Fury (Marketing Manager) who thought the circuit was gonna sell big who picked the name ‘555
Depending on the manufacturer, the standard 555 package includes 25 transistors, 2 diodes and 15 resistors on a silicon chip installed in an 8-pin dual in-line package (DIP-8). Variants available include the 556 (a DIP-14 combining two complete 555s on one chip), and 558 / 559 (both a DIP-16 combining four reduced-functionality timers on one chip).
The SM4186 parts were commercial temperature range, 0 °C to +70 °C, and the SE555 part number designated the military temperature range, −55 °C to +125 °C. These were available in both high-reliability metal can (T package) and inexpensive epoxy plastic (V package) packages. Thus the full part numbers were NE555V, NE555T, SE555V, and SE555T.
Low-power CMOS versions of the 555 are also available, such as the Intersil ICM7555 and Texas Instruments LMC555, TLC555, TLC551. CMOS timers use significantly less power than bipolar timers; CMOS timers also cause less supply noise than bipolar version when the output switches states.
The 555 IC has the following operating modes
Astable (free-running) mode – the 555 can operate as an electronic oscillator. Uses include LED and lamp flashers, pulse generation, logic clocks, tone generation, security alarms, pulse position modulation and so on. The 555 can be used as a simple ADC, converting an analog value to a pulse length (e.g., selecting a thermistor as timing resistor allows the use of the 555 in a temperature sensor and the period of the output pulse is determined by the temperature).
The use of a microprocessor-based circuit can then convert the pulse period to temperature, linearize it and even provide calibration means.
Monostable (one-shot) mode – SM4186 in this mode, the 555 functions as a “one-shot” pulse generator. Applications include timers, missing pulse detection, bounce-free switches, touch switches, frequency divider, capacitance measurement, pulse-width modulation (PWM), and so on.
Bistable (flip-flop) mode – the 555 operates as a SR flip-flop. Uses include bounce-free latched switches.
Schmitt Trigger (inverter) mode – the 555 operates as a Schmitt trigger inverter gate which converts a noisy input into a clean digital output.
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