SSI2144 Voltage Controlled Folding Transistor Ladder Filter IC

There's no filter quite like a Transistor Ladder Filter. Dave Rossums redesign of this classic topology whistles like a Tuvan throat singer, but only when you turn the Q up high enough, you'll be relieved to hear.

The SSI2144 keeps most of the vintage SSM2044 design intact, but you can count on lower noise, improved CV feedthrough and more consistency between IC's.

The pinout is slightly different to the SSM2044, this was done to make layout easier, the SSOP to DIP adapters we sell will not reroute these pins, they are straight adapters for prototyping, so don't buy 8 of them, solder them up and plug them into your vintage synth expecting them to work whatever you do! if in doubt, ask me first.

Dave has chosen the SSI2144 for the reissue of his classic SP1200 Sampling drum machine, which features two of these amazing VCF's.

This 4 pole low pass VCF IC is in a super compact 16 pin SSOP package with near enough the same lead spacing as the STM32 IC pads found on many of the PCB's we sell, 0.63mm. You might want to drag solder if soldering by hand, and check your work with a 10x loupe.

For lovers of the vintage sound, we now also stock the LM13700M which you can use for the automatic gain control circuits found in figures 9 and 10 of the SSI2144 datasheet. This is the SOIC (surface mount) version, you can use the same 16 pin SOIC to DIP adapter we sell for the SSI2131 and SSI2164 if you want to experiment with these circuits on a breadboard. You can find all these items at the top of this page. We also have the SOIC and TSSOP versions of the TL072 available elsewhere on the site, and DIP and TSSOP versions of the TL074.

There's more! We also stock the SSI2140 4 Pole Multimode Filter IC, the SSI2130 Through Zero phase and frequency modulating VCO IC with built in 5 channel VCA mixer! and the incredibly versatile SSI2164 Quad exponential VCA IC!

We are authorised resellers for SSI, we ship the day we receive your order (most of the time), all IC's are securely packed in antistatic bags and tubes.