High Idss 2SK170GR?

Sweetsweetback · 31st October 2010, 08:25 PM

I measured a bunch of 2SK170GR for Idss this afternoon and am a little puzzled. First, I am an electronics novice, so please forgive my ignorance.

My milliammeter has blown its fuse and I do not have a replacement in stock yet. So I decided to measure the voltage across a 100R resistor between the positive terminal of a 9V battery and the drain. I shorted the gate and source and connected them to the negative battery terminal.

My voltage readings across the resistor were in the 0.3 - 1.3V range, suggesting an IDss of 3 - 13 mA, with most clustering around 12-13 mA. This is pretty out of range for GR parts. Is there something wrong with my technique, my parts, or does Toshiba play a little fast and loose with their parts labeling?

Thanks!
(my first post)

Piersma · 31st October 2010, 08:50 PM

Are you sure that the SK170GR are genuine Toshiba parts?
Genuine Toshiba parts are within specs, no doubt.

There are a lot of counterfeiting parts supplied these days.....

Sweetsweetback · 31st October 2010, 11:40 PM

I have no certainty that these parts are genuine toshiba. I bought them from futurlec a few months ago. They look like any other 2sk170 I have used in the past, but who knows. It may be worth following up with futurlec Thanks for your response.

Sean

31st October 2010, 08:25 PM	#1
Sweetsweetback diyAudio Member Join Date: Dec 2004 Location: Cambridge, MA	High Idss 2SK170GR? I measured a bunch of 2SK170GR for Idss this afternoon and am a little puzzled. First, I am an electronics novice, so please forgive my ignorance. My milliammeter has blown its fuse and I do not have a replacement in stock yet. So I decided to measure the voltage across a 100R resistor between the positive terminal of a 9V battery and the drain. I shorted the gate and source and connected them to the negative battery terminal. My voltage readings across the resistor were in the 0.3 - 1.3V range, suggesting an IDss of 3 - 13 mA, with most clustering around 12-13 mA. This is pretty out of range for GR parts. Is there something wrong with my technique, my parts, or does Toshiba play a little fast and loose with their parts labeling? Thanks! (my first post)

31st October 2010, 08:50 PM	#2
Piersma diyAudio Member Join Date: Jan 2003 Location: Netherlands	Counterfeit Are you sure that the SK170GR are genuine Toshiba parts? Genuine Toshiba parts are within specs, no doubt. There are a lot of counterfeiting parts supplied these days.....

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31st October 2010, 11:40 PM	#3
Sweetsweetback diyAudio Member Join Date: Dec 2004 Location: Cambridge, MA	I have no certainty that these parts are genuine toshiba. I bought them from futurlec a few months ago. They look like any other 2sk170 I have used in the past, but who knows. It may be worth following up with futurlec Thanks for your response. Sean

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