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RP-SM304A FAQ

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(Hardware Products)

RP-SM304A

The Parastream RP-SM304A is a replacement part for the Siemens SM304A integrated circuit used in the Korg BX-3 and CX-3 combo organs, circa 1980. The Siemens SM304A is a keyboard encoder that converts 32 parallel keyboard inputs into a serial stream. These original Siemens parts were very difficult to find.

The RP-SM304A is a small printed circuit board that plugs directly into the 40-pin socket of the BX-3/CX-3 KLM-244 board. It utilizes surface-mount CMOS technology to realize its small size and low power consumption.

The Korg CX-3 uses two SM304A parts on one KLM-244 board. The BX-3 uses four SM304A parts on two KLM-244 boards. An adapter socket (23-00040615) is included with each RP-SM304A to facilitate mounting of the RP-SM304A in some circuit boards.

You may view or download the RP-SM304A datasheet and the RP-SM304A installation instructions. There is also a FAQ page for Frequently Asked Questions.

Key Benefits

  1. Functional replacement for the original Siemens SM304A part in most applications.
  2. Plugs directly into the IC socket on the PC board.
  3. SM304As may be replaced one at a time — Some other solutions require both to be replaced at the same time.

RoHS Compliance

The Parastream RP-SM304A is categorized as “Spare parts for equipment in service,” and is exempt from the RoHS (Lead-free) directive. The Parastream RP-SM304A is manufactured using non-RoHS compliant components and solder.

Pricing and Ordering

These parts are out of stock and we do not have plans to replace our inventory in the near future. Please order the original Siemens SM304A IC as an alternative.

RP-SM304A, Parastream Technologies and the Parastream Logo are trademarks of Parastream Technologies, Inc. Parastream is a registered trademark of Parastream Technologies, Inc. Korg is a registered trademark of Korg, Inc.


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