2sc5200 Transistor Price In Bangladesh

[Jovanna Ponder]

Inthe past, there was a huge variety of great transistors on the market which are perfectly suitable for analog audio applications. The situation has changed dramatically and in year 2021 there only a few transistors suitable for linear audio left. Furthermore, all kinds of electronic components have become more difficult and expensive to procure.

I have a small stock of old transistors for my projects so I'm currently not affected too badly by obsolete and out of stock components. However, I need to manage my small stock wisely and think of suitable substitutes early to save the good parts for applications where they perform best and investigate where lesser grade part are applicable.

I try to maintain an overview here about transistors that are still on the market and some obsolete ones that I have on stock for finding substitutes more easily. This overview may be helpful to quickly identify a transistor to fit a given pin-out.

Complimentary small signal transistors with high VCE of 150V. Compared to low voltage transistors like BC547 / BC557, base is in the center and just emitter and collector are swapped, so they can be swapped on the same PCB footprint with a 180 rotation. I bought some of them long time ago, but rarely used them for anything yet.

In general, such high voltage transistors like 2N5551 / 2N5401 or MPSA42 / MPSA92 should only be used in case high VCE is a requirement because a lot of transistor parameters are compromised for high VCE.

Low voltage (VCE = 45V), high current (IC max. 800mA) transistors with reasonable fT of 100MHz to 200MHz (depends on manufacturer and measurement method) that are available in selected hFE groups. The "-40" hFE group ranges from 250 to 630. They should be especially suitable for applications that require low saturation voltage. Some time ago I bought ones from Diotec because the price was attractive, but the ones from Diotec appear to have lower fT specified than most competitors. Diotec specifies only 100MHz fT, while apparently all other manufacturers specify around 200MHz or more. CDIL specifies different fT for NPN and PNP type.

Applications: Current mirrors, general low VCE applications where a fast transistor is beneficial. Best characteristics between roughly 10mA and a few hundred mA IC. There is a large deviation between BC327 and BC337 in hFE as function of IC.

Transistors in this group differ from each other in maximum VCE and the series features some low noise types. The whole series has high fT of minimum 150MHz to 300MHz typical as expected from a small signal transistor.

Low noise types BC549 / BC559 and BC550 / BC560 availability has become more sparse, especially in high hFE. I was lucky to grab some of the last BC559C as complement to the old BC550C I had in stock. Not a perfect match, but close enough.

In year 2021 I bough large bags of BC547C and BC557C for roughly five cents per transistor as general purpose transistors with VCE up to 45V for applications where low noise is not important. The "C" grade has high hFE of 400 minimum to 800 maximum (600 typ.).

This pair of low noise transistors offers higher VCE of 120V at rather low IC of 50mA maximum with mediocre speed of fT 50MHz to 100MHz. Those transistors come in selected current gain groups, with rather high hFE groups available in the past.

SMT packaged components are not very DIY friendly and I have long avoided them. Meanwhile I often design dual footprints for THT and SMT in case there would be a benefit from matched transistors or thermal coupling. While matched transistors in THT package are extremely expensive, matched SMT package transistors are very affordable.

The SMD equivalent of the BC337 is the BC817; likewise the BC807 is the SMD equivalent of the BC327. Like with other small signal transistors in SMD package, there are dual NPN or PNP and dual mixed polarity available, which may be more or less matched and thermally coupled. It seems that there are no precisely matched pairs available. I wonder why fT of the BC817 and BC807 transistors I have seen so far often may be as low as roughly half of the THT package variant.

The specification of those transistors in most manufacturers datasheets is omitting many important aspects. Expect substantial variation between manufacturers. The old BD139 / BD140 from Philips were just BC639 / BC640 put into TO-126 package. The different package slightly alters the electrical parameters. The newer BD139 / BD140 from different manufacturers are not made this way, but have a bigger die with different characteristic.

SMD equivalent would be the BCP53 / BCP56 in SOT-223 package. ON Semiconductor specifies 50 to 130 MHz fT for theirs. Nexperia also offers them and claims an fT of 100 to 180 MHz. Both manufacturers offer selected hFE groups.

Medium VCE and rather high current transistors with good SOA, but hFE seems to be a gamble and fT is as bad as a high power transistor. Yet I haven't found application for those and this is why I did not buy any. I doubt they are any useful for audio applications.

High VCE transistors with impressive SOA for such a small package. Specification in the datasheet is omitting many important parameters like fT. Those transistors may have substantial deviations between manufacturers. Pierre Lacombe measured fT of roughly 20MHz for MJE340 and 10MHz for MJE350.

Good as powerful high voltage general purpose transistors, but not directly in the signal path. Can be used as cascode transistors, but they likely have rather high capacitance, which compromises performance in this application.

The SC3503 and SA1381 are complimentary to each other and are excellent transistors for linear audio applications. Low Cob, high FT and high VCE with good SOA make them a very good choice in the VAS and as low power drivers. Unfortunately the high beta selected ones are no longer available. I have some old "F" grade with hFE of around 200 and no good idea for good substitute parts once I run out of stock.

This is a very special pair of transistors, which features rather low VCE, very high IC, high and linear hFE from 10mA to 2A and very high fT from roughly 1A on. This makes them especially suitable for low voltage class A operation emitter follower applications or being bootstrapped in high power amplifier output stages.

Power transistors in TO-3P package for driver or power output stages. They are roughly half as powerful as the MJL3281 / MJL1302 for roughly half the cost (at time of writing). In emitter follower stages, distortion is a function of the transistor count: Distortion of [n] parallel transistors is 1/n of a single transistor pair. This makes the idea to parallel several less powerful transistors appealing. Also, overall thermal resistance is lower with several packages in parallel.

The ON Semi datasheet is a bit ambiguous regarding the package. The package is referred to as TO-3P or TO-264 in different parts of the document. The transistors I bought are from Toshiba and came in TO-3P package.

The thermal resistance for the larger TO-264 package is the same RΘJC=0.83 like for the TO-3P package. SOA is better for the larger package. However, I do not find the more expensive package worth twice the cost. In this package size, I would rather chose MJL3281 / MJL1302, which appear to have slightly better SOA and slightly lower RΘJC of 0.625 only.

Excellent power transistor for power output stages. They are very robust. I used them in a power amplifier output stage with 100VPP power supply and due to a mistake, the bias current instantly went so high that four of them in parallel blew a pair of 4A slow blow fuses.

There are more such comparison tables on the internet. Greg Erskine has made some tables, which seem no longer maintained and contain mostly obsolete transistors. Those tables may be most helpful finding substitutes for old transistors.

There is an interesting discussion about the 5200 / 1943 transistors on the DIY Audio forum. This helps to better understand all the confusion around the various shades of 2SC5200 / 2SA1943 transistors made by different companies to slightly different specs.

The old Motorola small signal transistor data books provide a good reference for historic transistors, including some transistors still in production. Good copies can be found on archive.org. For example the 1983 Motorola small signal transistors data book.

In power, transistors are faster, and with a higher voltage ratio are the two types of transistors. On the other hand, the cheaper options of trans Historors are those that require more current and power from the original ones.

These transistors offer high-power circuits with tiny and easy to operate. In addition, the 2sc5200 trans Histor is a large group of transistors that handle high-power circuits are tiny and easy to maintain. On the other side of the 2sc5200 transistor, the 2sc5200 transistor is the more common type of transist as, it only allows for electronic components to operate in a certain way, such as a voltage transist.

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BC547 transistor has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 100mA, hence we cannot connect loads that consume more than 100mA using this transistor. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA.

When this transistor is fully biased then it can allow a maximum of 100mA to flow across the collector and emitter. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (VCE) or Base-Emitter (VBE) could be 200 and 900 mV respectively. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 660 mV.

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