BC557 SOT 23 PDF

Product data sheet. Supersedes data of Apr Oct DISCRETE SEMICONDUCTORS. BC; BC PNP general purpose. PNP general-purpose transistors in a small SOT23 (TOAB) Surface-Mounted Device. (SMD) plastic package. Table 1. Product overview. Low noise input stages of audio frequency equipment. DESCRIPTION. PNP transistor in a SOT23 plastic package. NPN complements: BC

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Simplified cross section of a planar NPN bipolar junction transistor.

For example, in the typical grounded-emitter configuration of an NPN BJT used as a pulldown switch in digital logic, the “off” state never involves a reverse-biased junction because the base voltage never goes below ground; nevertheless the forward bias is close enough to zero that essentially no current flows, so this end of the forward active region can be regarded as the cutoff region.

The germanium transistor was more common in the s and s, and while it exhibits a lower “cut-off” voltage, typically around 0. This section may be too technical for most readers to understand.

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NESG is another nice device in this respect. Working on bcc557 table for our book, soliciting your opinions, info and advice. The hybrid-pi model is a popular circuit model used for analyzing the small signal behavior of bipolar junction and field effect transistors. As shown, the h-parameters have lower-case subscripts and hence signify AC conditions or skt. After that, you can post your question and our members will help you out. In general, transistor-level circuit design is performed using SPICE or a comparable analog-circuit simulator, so model complexity is usually not of much concern to the designer.

Wikimedia Commons has media related to Bipolar junction transistors. Darlington transistor Sziklai pair Cascode Long-tailed pair. The collector—emitter current can be viewed as being controlled by the base—emitter current current controlor by the base—emitter voltage voltage control. In particular, the thickness of the base must be much less than the diffusion length of the electrons.


The electrons in the base are called minority carriers because the so is doped p-type, which makes holes the majority carrier in the base. Detailed transistor models of transistor action, such as the Gummel—Poon modelaccount for the distribution of this charge explicitly to explain transistor behaviour more exactly. Another model commonly used to analyze BJT circuits is the h-parameter model, closely related to the hybrid-pi model bc557 the y-parameter two-portbut using input current and output voltage as independent variables, rather than input and output voltages.

The bc55 of symmetry is primarily due to the doping ratios of the emitter and the collector.

Here’s what I have so far in the condensed table: This section’s use of external links may not follow Wikipedia’s policies or guidelines. In terms of junction biasing: From Wikipedia, the free encyclopedia.

St improve this article by removing excessive or inappropriate external links, and converting useful links where appropriate into footnote references. The diagram shows a schematic representation of an NPN transistor connected to two voltage sources.

BC sot datasheet & applicatoin notes – Datasheet Archive

The junction version known as the bipolar junction transistor BJTinvented by Shockley in[11] was for three decades the device of choice in the design of discrete and integrated circuits. This gain is usually or more, but robust circuit designs do not depend on the exact value for example see op-amp.

The device b557 loses all gain when in this state. For their operation, BJTs use two junctions between two semiconductor types, n-type and p-type.

BC smd sot23 datasheet & applicatoin notes – Datasheet Archive

F is from forward current amplification also called the current gain. The collector diode is reverse-biased so I CD is virtually zero. This allows BJTs to be used as amplifiers or switches, giving them wide applicability in electronic equipment, including computers, televisions, mobile phones, audio amplifiers, industrial control, and radio transmitters.


When a transistor is used at higher frequencies, the fundamental limitation is the time it takes the carriers to diffuse across the base region In addition, higher doping in the base can improve figures of merit like the Early voltage by lessening base narrowing.

A significant minority are also now made from gallium arsenideespecially for very high speed applications see HBT, below. Semiconductor Device Modeling with Spice. In contrast, unipolar transistors, such as field-effect transistorsonly use one kind of charge carrier. Compact Models of Bipolar Junction Transistors, pp. Small changes in the voltage applied across the base—emitter terminals cause the current between the emitter and the collector to change significantly.

The DC emitter and collector currents in active mode are well modeled by an approximation to the Ebers—Moll model:.

A bipolar junction transistor bipolar transistor or BJT is a type of transistor that uses both electron and hole charge carriers. Connecting two diodes with wires will not make a transistor, since minority carriers will not be able to get from one P—N junction to the other through the wire.

BC857 – (SMD SOT-23 Package) – PNP General Purpose Transistor – 5 Pieces Pack

Although these regions are well defined for sufficiently large applied voltage, they overlap somewhat for small less than a few hundred millivolts biases.

July Learn how and when to remove this template message. In active mode, the electric field existing between base and collector caused by V CE will cause the majority of these electrons to cross the upper P-N junction into the collector to form the collector current I C.

Each semiconductor region is connected to a terminal, appropriately labeled: Jan 31, 7.