THAT4301 Substitute?

[twebb6778]

I'm currently building a Muzzle with SMD THAT4301, and plan to build more in the future. It's a wicked circuit!

That being said (no pun intended), the THAT4301, particularly in an SMD package, seems to getting harder to find and prices are starting to become silly. In Australia it'll cost close to $40 for a single IC.

With these being discontinued, is there a suitable pin for pin replacement available? Maybe the 4305? Failing that, is there something else I can frankenstein onto my builds?

 

[EGRENIER]

Seems you never got an answer on this topic. I have the same question. According to what I can find the 4305 is the replacement, but I don't know enough (or understand enough) about IC to actually confirm if it would would in the Muzzle circuite.

 

[Robert]

The 4305 isn't a direct replacement for the 4301. It'll involve a modified circuit or an adapter board with an additional opamp.

It's also a completely different package style with much smaller pins.

 

[EGRENIER]

Thanks for the info, so we are in a jam, 4301 can't be replaced and seems almost impossible to procure from trusted source.

Anyone knows of trusted vendors that sill carry some ?

 

[Robert]

Don't risk it with any unreliable sources, I'll work up an adapter board for the 4305.

 

[zgrav]

Don't risk it with any unreliable sources, I'll work up an adapter board for the 4305.

Maybe a modified Muzzle PCB using the 4305.....

 

[twebb6778]

I ended up rolling the dice and buying one from aliexpress that someone else on here mentioned having success with.

Hasn't arrived yet but I'll update once it comes. From memory the 4305 needs a few more external components (2 op amps I think?) but will do the job. An adapter board or new Muzzle to accommodate the 4305 would also be amazing, but I understand you're busy so no sweat.

 

[zipfool]

I ended up rolling the dice and buying one from aliexpress that someone else on here mentioned having success with.

Hasn't arrived yet but I'll update once it comes. From memory the 4305 needs a few more external components (2 op amps I think?) but will do the job. An adapter board or new Muzzle to accommodate the 4305 would also be amazing, but I understand you're busy so no sweat.

Any update on this? I realize it might still be traveling halfway around the world to get to you, but I'm curious what you've found. Otherwise, PCBs like the Muzzle are a bit useless until there's a solution :-(

 

[twebb6778]

Any update on this? I realize it might still be traveling halfway around the world to get to you, but I'm curious what you've found. Otherwise, PCBs like the Muzzle are a bit useless until there's a solution :-(

It worked! No problems at all, it's a nice surprise. I got this one if you're interested:

14.88US $ |100% Original That4301s That4301 Ssop30 Integrated Circuit - Replacement Parts - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

 

[fig]

It worked! No problems at all, it's a nice surprise. I got this one if you're interested:

14.88US $ |100% Original That4301s That4301 Ssop30 Integrated Circuit - Replacement Parts - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

Thanks for that. I just ordered a set.

 

[Dali]

The Muzzle will never leave my board. I'm happy to see "alternative" seems to works so more people can enjoy that one.

 

[Abyssmal]

It worked! No problems at all, it's a nice surprise. I got this one if you're interested:

14.88US $ |100% Original That4301s That4301 Ssop30 Integrated Circuit - Replacement Parts - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

Hey i might buy one of theses, they still works fine in your pedal? Thanks

 

[Abyssmal]

Thanks for that. I just ordered a set.

Did it work in your pedal you too? I ask because they might have different batches...

 

[fig]

Did it work in your pedal you too?

I haven't built it yet. It's in the queue!

 

[MBFX]

Has anyone procured one of these chips recently?

 

[fydo]

Not recently, but 2 years ago I grabbed one of these retrofit boards and it worked perfectly:

THAT4301 RetroFit Module - PedalPCB.com

Dynamics Processor

www.pedalpcb.com

Cheers!

 

[Elijah-Baley]

I got issue with two of them, when I replace the original THAT4301.
In a Muzzle PCB.

 

[gaetano]

I have some THAT4301 DIPs which have been in my drawers for years. I got them direct from THAT Corp, what are these (reasonably) worth now?

I also have a few left of these transistor arrays (and other ICs) which I purchased at about the same time: 300P, 320P, 340P.

Here are some images below:

 

[darwin999]

There's also Small Bear / Synthcube

THAT4301 Replacement PCB Chiclet THAT4305 DIP-20

THAT4301 Replacement PCB Chiclet THAT4305 DIP-20THAT Corp obsoleted the THAT 4301 and published a recommended replacement circuit using their THAT4305 SMT IC. Courtesy of our good friend Pete Hartman we have created a small batch of assembled PCB chiclets that include the THAT4305 and

synthcube.com

 

[Paul.Ruby]

The 4305 works great but requires BJT opamps. You cannot use jfet opamps, like TL072. The chiclet linked above and also available at pedalpcb work fine. They use NJM8080 or NJM8068 opamps. This link describes the difference between them.

https://s44936ecb73249310.jimcontent.com/download/version/1584036360/module/10277934168/name/4301-4305%20transition-guide.pdf

I've made a custom PCB for the muzzle using the SMT components and it works great. The goal of this was to make it as compact as possible for a combo pedal that will be the core of my pedal board (Muzzle, Mini-spark, Prince of Tone, AMT LA2 M2 and C2).


This is what the combo pedal looks like... Muzzle is upper right. Still waiting on a PCB for the channel switching in the middle.