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J310 JFET transistor prototype sample and hold circuit

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j310 jfet equivalent

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J309 MOSFET. Datasheet pdf. Equivalent

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Fortunately it is normally possible to use a replacement transistor type as there is often a considerable degree of overlap between the specifications of different types of transistor, and by looking at the basic specifications it is normally possible to choose the correct transistor replacements.

This explanation is focussed on bipolar transistors, but it is possible to apply similar logic to other electronic components including field effect transistors to ensure that suitable replacements can be found. When looking for suitable transistor replacements it is necessary to look at the main specifications for the transistor. Once the transistor specifications and parameters have been ascertained, it is possible to check for other replacement transistor types with similar parameters that will be able to operate within the circuit in question.

When considering any possible replacement transistors, it is necessary to look at a variety of parameters. These will include the basic parameters of the transistor operation performance. They will also include the environmentally related parameters, and the physical parameters. All these need to be taken into account when choosing a suitable replacement transistor. Fortunately many transistors used in electronic circuit design are general purpose types.

Their specifications are not particularly exacting and a variety of general purpose transistors could be used.

Choosing Transistor Replacements

Today, the performance of even general purpose transistors is exceedingly high and they can be used in a variety of applications. However a much closer look must be taken at transistors that fulfil a more exacting role. Their specifications need to be examined more closely to ensure that any substitutes will have a similar specification.

j310 jfet equivalent

When looking for a suitable transistor replacement some of the basic transistor parameters that need to be considered include the following:.

Other types are normally only used in very specialist applications. It is important to know what type the transistor is because there is a difference in the base emitter forward bias voltage drop. For germanium it is around 0. The circuit will be designed around a particular voltage drop. Possible application types may include: switching, analogue, low power, RF amplifier, low noise, etc. Put in the correct type and it may not perform well. For example a low power general-purpose transistor is unlikely to work well in a switching application even if it has a high ft or frequency limit.The manufacturer can screen them for Idss and give them a separate part number, like the 2N series does--they just take a huge batch and sort them for Idss and then mark them accordingly.

Low current JFETs won't be destroyed by more than several seconds of this; simply monitor until the current is more or less steady. You can measure Idss of most JFETS, but the J, and and U etc family will heat up and destroy itself if you let unrestrained drain current go for more than several seconds; the factory determines Idss for these with a pulse test.

So, that's why a bias adjust is practically mandatory when playing with JFETs in a common source type of configuration. And for my particular whipamp circuit, the JFET bias is adjusted for minimum distortion products when the final whipamp is being adjusted on the bench, using a 2-tone IMD distortion test setup.

First, a word schematic of the JFET circuit. I use a source follower. The gate resistor to ground is 10M it can be most any value from M, the actual input impedance will be quite a bit lower.

Use a nominal 10K pot, with one end to ground, the other end to Vcc. From the pot wiper insert a 2. The wiper can be decoupled to ground with a 0.

The JFET drain needs to be very well decoupled to ground with a 0. The pot can then be set for the desired JFET current, monitored by the voltage across the source.

I forget which position of the pot sets the current to the max, to be safe, set the pot to midposition. J's can have mA drain current as their max current spec known as "Idss", drain current with gate shorted to source --of course normally you never run them at max current.

Parts Information Index. To the Homebrew Pages.Welcome, Guest. Please login or register. Did you miss your activation email? This topic This board Entire forum Google Bing. Print Search. Except, it's obsolete in TO So, do I bodge it into my homebrew projects in SMD form, search for some magical end of rainbow pot of Js somewhere or is there a nice alternative out there that's cheap enough for me to buy a bag of 50 or more?

The following users thanked this post: cdev. Kleinstein Super Contributor Posts: Country:. One might be lucky and get a few old ones from not so suspicious sites, but they are generally already expensive - so not to buy like 50 pieces. I would not expect the SOT23 version to go obsolete to soon. There are several manufacturers for this - some may stop this or just do minute changes to the tapes. For the BF there was quite some confusion on going obsolete.

For manual use this does not matter and for the machines it is just entering the correct tape type. If you can't handle SOT and such, man, Idunno. You're screwing yourself over if you let yourself think that. I find SMT better for everything except breadboarding -- and the solderless breadboard isn't of much use in applications like this RF amps and such, up to 50MHzso you're surely not losing much?

And if you still need to breadboard, breakout boards are easily made -- I have a couple 2N and BSS84 floating around, that are mounted on hunks of FR-4, carved up for the connections, with pigtails soldered on for breadboarding. Ugly but it works. Bringing a project to life? Send me a message! Try a U? Mouser has in the plastic package. Not cheap at 7.Gate Source Cutoff Voltage. Parameters and Characteristics.

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j310 jfet equivalent

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Cross reference J310

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We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies.No more MPFs. Poor Radio Shack! The stores can't stock what they can't buy. Wholesale vendors don't sell the MPF or 2N anymore. Fortunately there are good alternatives, but these require a little hunting and gathering.

What should you do? These parts were available over the Web, with free shipment to your local store.

j310 jfet equivalent

Yet since Radio Shack's reorganization, the Web site can no longer fix you up with these equivalents. I still recommend the parts, though. See below. New-old stock. You can also check eBay for available prices on a new-old stock MPF Some such parts come from China. Amazon now carries Chinese parts, too. I understand that these are Chinese-manufactured parts, not new-old stock.

Parts tolerances might vary quite a bit. If the vendor is over there, standard shipping to the U. The replacement JFETs seem to bias up all right. Of course, I don't know how they'll sound with your guitar or microphone. I think these devices are worth a try. I recommend trying one of the less-expensive parts.

The part numbers and vendor names below are clickable. Click for links to more information. Differences between parts in the table above. For our use in a nine-volt preamp, I don't detect any important difference in the more expensive NTE parts.

If these FETs are available in the corner store, the convenience might be worthwhile. One that I don't recommend: NTE If you can't find the other parts, an NTE will work. Otherwise, it's the least attractive choice. Here are my reasons Be careful! Wire the parts according to the datasheets. This difference might be distinctive and desirable. Or you might not notice any difference. If you have feelings one way or the other, please drop me a line.It offers a large amount of data sheet, You can free PDF files download.

The updated every day, always provide the best quality and speed. J, J Preferred Device. Forward Gate Current. Junction Temperature Range. Storage Temperature Range. Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values not. If these limits are. STYLE 5. AYWW G. Note: Microdot may be in either location. See detailed ordering and shipping information in the package.

Preferred devices are recommended choices for future use. Publication Order Number:. STYLE PIN 1. ON Semiconductor and. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications. This literature is subject to all applicable copyright laws and is not for resale in any manner.

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