THAT4301 Analog Engine End of Life. Last Time Buy May 1, 2019

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mediatechnology
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THAT4301 Analog Engine End of Life. Last Time Buy May 1, 2019

Post by mediatechnology » Fri Jan 18, 2019 1:14 pm

MEMORANDUM

To: All 4301 Customers
From: THAT IC Marketing and Sales
Re: 4301AP20-U, 4301P20-U & 4301W20-U End of Life (EOL)
Date: January 16, 2019

As one of the customers currently purchasing the 4301 part, we are very sorry to tell you that we
must cease production of the 4301 later this year. This applies to the 4301AP20-U, 4301P20-U
and the 4301W20-U.

Why are we discontinuing the 4301?
Our foundry supplier is discontinuing the process in which these products are manufactured.

Will there be a "last time buy" opportunity?
Yes, we will accept new (last-time buy) purchase orders up until May 1, 2019.

All shipments must be taken by May 1, 2020. And, once accepted by us, last-time buy orders
cannot be cancelled, or returned for any reason except those relating to quality.

What alternatives are there to the 4301?
We offer four other Analog Engines: the 4305, 4315, 4316, and 4320. All these are currently in
production and available for immediate shipment. Three of them (the 4305, 4315, and 4320) are
made in our own fab. These products offer a range of price and performance options. The 4305,
in particular, runs from similar power supply voltages as the 4301 and provides the critical VCA
and RMS level detector function of the 4301. It lacks the opamps, but of course there are many
opamps available in the market. We recommend that you consider the 4305 in any redesigns.

In addition, THAT Application Support can offer assistance in adapting one of our other Analog
Engines to fill your requirements.

Where do I go to ask questions?
If you have any questions or concerns regarding the last time buy, please contact Tom Ryan,
Customer Service Supervisor, at 508-478-9200 x138, or via email at sales@thatcorp.com.
Applications Support can be reached at apps_support@thatcorp.com.
pdf here: http://proaudiodesignforum.com/images/p ... Notice.pdf
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emrr
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Re: THAT4301 Analog Engine End of Life. Last Time Buy May 1, 2019

Post by emrr » Wed Feb 06, 2019 11:45 am

I see my inventory are all the 'A' version, and that was discontinued 4-5 years ago. I hardly see a difference, and maybe the current version had improvements that obsoleted the need for two versions. All the relevant project discussions are long gone from here and the other place, remind me again why the 'A' was specified, and does it matter now?
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Doug Williams
Electromagnetic Radiation Recorders

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JR.
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Re: THAT4301 Analog Engine End of Life. Last Time Buy May 1, 2019

Post by JR. » Wed Feb 06, 2019 12:16 pm

from looking at the data sheet the 4301A appears to deliver slightly lower THD+N
THAT wrote: In the 4301A, the VCA is selected for low THD at extremely high levels.
So better part for hot levels. Looking at distortion plots, there appears to be a small increase of THD at lower level for selected A parts, but unlikely to be audible or significant.

JR
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Re: THAT4301 Analog Engine End of Life. Last Time Buy May 1, 2019

Post by emrr » Wed Feb 06, 2019 1:21 pm

Ah yes, I see it now. Thanks.
Best,

Doug Williams
Electromagnetic Radiation Recorders

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mediatechnology
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Re: THAT4301 Analog Engine End of Life. Last Time Buy May 1, 2019

Post by mediatechnology » Wed Feb 06, 2019 2:06 pm

I still have a few 4301A that I used in my Pico.
There really isn't much difference in 4301/4301A THD other than at high input levels.

I would definitely score some regular 4301 while you can.
The good news is that there are now 18/tube versus 20 so you don't have to spend quite as much.
The 20 pin DIP over-mold got a little bigger a couple of years ago and tubes shrank by 2 units.
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