Newark provider notified me of this information and the manufacturer Onsemi, I confirm that all models have been discontinued. Although more questions Onsemi did not want to give more information.
Besides the option of Sanken: Does anyone know what other option is there with this technology?
Or does anyone know if this product was purchased by another brand?
Besides the option of Sanken: Does anyone know what other option is there with this technology?
Or does anyone know if this product was purchased by another brand?
Last edited:
Good riddance. As I've said idealy the output devices should have another transistor on the same substrate that can then be used in a bias multiplier. Incorporating diodes instead was suboptimal.
I'm not surprised. The TT devices were difficult to apply, as the TC of the diode WRT the tranny were far from matched. Actually, it was a botch job.
Cheers, E.
Here are some,
15 A, 260 V NPN ThermalTrak Audio Bipolar Power Transistor / Diode
Still available and in plentiful supply if one needs any.
15 A, 260 V NPN ThermalTrak Audio Bipolar Power Transistor / Diode
Still available and in plentiful supply if one needs any.
Great news, botched products always bite the dust. Finger crossed for a Sanken products second (more affordable) source.
I remember Charles Hansen getting mightily pissed off with me for making a business statement about these devices about 3 years ago. I don't know the root cause for ON stopping these devices. Could be a fab closure or transfer, and re-developing an re-qualing are not justified from the business point of view. Or, they just don't sell in high enough volumes - so you prune them from your portfolio. And, if they need lots of tech support or have quality problems . . . kill 'em! How do I know? I was a product line GM for 10 years and part of that time was managing bipolar devices 
Temp comp on EF2s is easy, triples are difficult. In this latter case, may I respectfully offer the Bonsai 2 point method here Ovation e-Amp see page 37
Of course, if you want dynamic bias compensation - so bias adjusted with the short term music signal behavior - then you will have to look elsewhere. However, the Thermaltrak devices never offered that anyway so no great loss: class AB is ALIVE AND WELL!!!!!
Nevertheless, RIP Thermaltrak
Temp comp on EF2s is easy, triples are difficult. In this latter case, may I respectfully offer the Bonsai 2 point method here Ovation e-Amp see page 37
Of course, if you want dynamic bias compensation - so bias adjusted with the short term music signal behavior - then you will have to look elsewhere. However, the Thermaltrak devices never offered that anyway so no great loss: class AB is ALIVE AND WELL!!!!!
Nevertheless, RIP Thermaltrak
Last edited:
OK I didnt realise they had issues. I still doubt any mainstream manufacturer will be developing complementary power devices for audio. Happy to be proved wrong... especially if they are V-Fets
For On semi, yes. The Sankens have excellent matching of tempco between the diode (strings) and the power dies. I believe these still are available, e.g. from Profusion. STD03N & P. But they are Darlingtons...
jan
