Smd Transistor Codes

There are still lots of options. The first letter B is for silicon, A is for germanium rarely used now. Home Questions Tags Users Unanswered. There are a number of other copies of this codebook on the Net, of varying ages.

Identifying SMD electronic components by their marking codes

Many devices from Rohm Semiconductors which start with G have direct equivalents found in the rest of the code. The quantities shown in the table are explained below.

Most projects will specify a particular transistor, but if necessary you can usually substitute an equivalent transistor from the wide range available. If you're unsure, you will need to search for both. Sometimes a series of devices, derived from the same die, have related type not code numbers. Many manufacturers use an extra letter as their own identification code, or to show the country of manufacture.

Diode & transistor numbering codes

When you have looked up a device, the Base letter will guide you to a pin-out diagram. The letter at the end identifies versions with different voltage ratings. Make sure the measurement is precise, or measure across multiple pins and divide by the number of pins to get the pin pitch. These have been ignored in the alphabetical ordering.

There are many different ways of organising a numbering scheme. For these devices, once they are loose and out of their packaging it is very difficult to tell their value. Identification is usually possible from the code number, but some manufacturers use the same code. Supplier Directory For everything from distribution to test equipment, components and more, our directory covers it. When two resistor values are given, the first is the series base resistor, and the second the resistor between base and emitter.

The guaranteed minimum value is given because the actual value varies from transistor to transistor - even for those of the same type! Using only three figures, the actual characters can be made larger than those of the four figure system that would otherwise be needed.

Transistor codes - Surface Mount PNP NPN Choosing Transistor TIP B AIdentifying SMD electronic components by their marking codes

With some testing, I found my part. In this way there were vast numbers of different numbers for devices many of which were virtually identical.

Other types of transistor may be required for radio frequency applications. If it is an old part, a search through old datasheets or maybe an email to the manufacturer might be the way to clarify the part.

Sometimes minimum and maximum values are given. Would you like to answer one of these unanswered questions instead? Use parametric searches at the manufacturer's website and package information to narrow down the number of parts.

People should be aware that there is no guarantee that you will be able to find your part. Most of the discrepancies are minor, but please consult information from your supplier if you require precise data. Anyone out there who wants to donate up-to-date data books, they would be a most welcome aid to updating the codebook. Where no exact leaded equivalent exists, a brief device description is given, which may be sufficient to allow substitution with another device.

Transistor codes - Surface Mount PNP NPN Choosing Transistor TIP B A

Maximum voltage across the collector-emitter junction. To make selection easier most suppliers group their transistors in categories determined either by their typical use or maximum power rating. What is the concern there? The polarities of the two types are different, so if you are looking for a substitute it must be the same type. Normally, where a voltage, current or power is specified, these will be limiting values.

Package dimensions can also be found at manufactures websites in datasheets or sometimes in files separate from datasheets, it might take some hunting around to find them. First Letter Specifies semiconductor material. Thank you for your interest in this question. However, they may have a different case style so you will need to take care when placing them on the circuit board. If all that doesn't work, and your part is still functional, you might have to do more reverse engineering of the circuit and find the functionality of the part.

They contain a great deal of useful information but they can be difficult to understand if you are not familiar with the abbreviations used. However both of these diode and transistor numbering schemes are widely used and enable the same device types to be made by a number of manufacturers.

Using these diode and transistor numbering schemes it is possible to look at the part number and identify certain properties it will possess and what applications it may be used for. Choosing a transistor Most projects will specify a particular transistor, 5 star tamil movie but if necessary you can usually substitute an equivalent transistor from the wide range available.

To make a final choice you will need to consult the tables of technical data which are normally provided in catalogues. It is one of a whole series of parameters for transistors, each with their own symbol. As there is a vast number of different types of transistor, each type is given a unique code so that it can be identified and identical ones bought. This allows you to pull up a datasheet and check. In these cases, it's a case of looking at the device with a magnifying glass.

Diode & transistor numbering codes

Reverse joggle devices do present a few problems. Transformer Characteristic.

When describing device characteristics, some terms are implied from the type of device. Category This shows the typical use for the transistor, it is a good starting point when looking for a substitute.

There is no obvious logic to the numbering system. Catalogues may have separate tables for different categories. The data in this table was compiled from several sources which are not entirely consistent!

Some are translations with my permission, some are just straight rip-offs. Now look up the code in the alphanumeric listing which forms the main part of this book by clicking on the first character shown in the left-hand frame. These are transistors with similar electrical properties which will be suitable substitutes in most circuits. In the early days of thermionic valve vacuum tube manufacture, each manufacturer gave a number to the types they manufactured.

Pro-Electron Numbering or Coding System

SMD marking codes

This enables equipment manufacturers to buy their semiconductors from a number of different manufactures and know that they are buying devices with the same characteristics. Those intended for domestic use have three numbers, but those intended for commercial or industrial use have letter followed by two numbers, i. You can ignore this rating in low voltage circuits. This smaller letter is merely a month of manufacture code. If you have any extra information to add to what's here, I'd be very grateful.

SMD resistor coding schemes