Description
xThe FANUC A20B-3900-0182 is a memory module used in industrial FANUC CNC controller systems. It combines Flash ROM (FROM) for firmware/program storage and SRAM for parameter/runtime data needed by the controller electronics.
📌 What It Is
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Part Number: A20B-3900-0182
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Type: FROM + SRAM memory module (printed circuit board)
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Memory Configuration:
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32 MB Flash ROM (FROM) — holds the CNC controller’s core firmware and system programs.
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256 KB SRAM — battery-backed memory used for storing runtime data, machine parameters, and settings.
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🧠 Function in FANUC CNC Controllers
This module sits inside the controller’s electronics alongside CPU boards and other control modules. Its role is critical because:
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FROM stores the firmware and control software that the CNC needs to boot and operate.
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SRAM retains configuration data, parameters, and runtime variables, often backed by a battery so this information isn’t lost when the machine is powered off.
If this memory module fails or is missing, the CNC controller may fail to initialize, lose saved machine parameters, or throw memory-related alarms at startup.
⚙️ Installation & Notes
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When replacing the A20B-3900-0182 module, all FROM files, parameters, and programs must generally be reloaded from backups after installation to restore the controller to correct operation.
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It’s part of the broader A20B-3900 series of FANUC memory modules, which come in various combinations of FROM and SRAM sizes for different controller models.
Additional Information
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Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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