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Gearmotors: What They Are and How to Size a Replacement
Many industrial loads need torque an electric motor can’t deliver on its own, at a
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8 MB FROM flash ROM module in DIMM form, Fanuc Program Memory C, for Series 16i, 18i and 21i CNC master boards and R-J3 robot controllers. Module only.
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| MFR / Brand | FANUC |
|---|---|
| MPN | A20B-3900-0072 |
| Model | A20B39000072 |
| Base Number | A20B-3900 |
|---|---|
| Industry Terms | FROM module; flash ROM module; Fanuc memory module; Program Memory C; CNC DIMM; i-series memory board; system software module |
| Application Types | Fanuc i-series CNC system software storage; R-J3 robot controller memory option; CNC control repair and memory expansion |
| Connector Style | DIMM edge connector |
| Controller Platform | Fanuc Series 16i / 18i / 21i CNC; Fanuc R-J3 robot controller |
| Mpn Variants | A20B-3900-0072; A20B39000072; A20B 3900 0072; A20B-39000072; A20B3900-0072 |
| Manufacturer Status | Legacy but well supported by the aftermarket. Fanuc Corporation remains in business and Fanuc America supports the i-series range; a very large 16i/18i/21i installed base is still in production. |
| Compatible With Replaces | Fanuc Series 16i, 18i and 21i CNC master boards (listed specifically for the larger 16i / 18i Model A controls); Fanuc R-J3 robot controllers as an option module |
| Part Number | A20B-3900-0072 |
| Mounting Type | DIMM socket on the CNC master board / motherboard; horizontal option position on R-J3 main PCB |
| Common Misspellings | Fanuc A20B-3900-072, Fanuc A20B 3900 0072, A20B-3900-0027, Fanac A20B-3900-0072 |
| Cross Reference 1 | A20B-3900-0012 - alternative Fanuc number |
|---|
Fanuc A20B-3900-0072 is an 8 MB FROM (flash ROM) memory module in DIMM form, designated Program Memory C. It plugs onto the main system board of a Fanuc i-series CNC control, listed for the larger 16i / 18i Model A controls, and is catalogued as an option module on Fanuc R-J3 robot controllers (A16B-3200-0330 or A16B-3200-0331 main PCB). Contents when programmed: NC basic files and other system files. Unit Quantity: 1 Pc. Module only. Country of Origin: Japan.
A20B-3900-0072 — Fanuc part number for the 8 MB FROM DIMM module.
FROM — flash ROM. It holds the CNC system software: the NC basic package, servo and spindle control software and option software. Non-volatile, no battery.
Memory Type: FROM (flash ROM), DIMM form factor. Memory Capacity: 8 MB. Fanuc Designation: Program Memory C. Connector Style: DIMM edge connector. Unit Quantity: 1 Pc.
Form Factor: DIMM with edge connector. Mounting: DIMM socket on the CNC master board or motherboard; horizontal option position on the R-J3 main PCB.
CNC platforms: Fanuc Series 16i, 18i and 21i (i-series master board / motherboard), listed specifically for the larger 16i / 18i Model A controls. Robot platform: Fanuc R-J3 controllers, option module on the A16B-3200-0330 / A16B-3200-0331 main PCB. Alternative Fanuc part number: A20B-3900-0012. Search forms: A20B-3900-0072, A20B39000072, A20B 3900 0072.
An 8 MB FROM (flash ROM) module in DIMM form, Fanuc Program Memory C. FROM holds CNC system software; SRAM modules, which hold user data and are battery-backed, are a separate part with the same DIMM form factor.
Fanuc Series 16i, 18i and 21i CNC master boards, listed for the larger 16i / 18i Model A controls, and Fanuc R-J3 robot controllers as an option module.
A20B-3900-0012.
$119.99
1 in stock
$71.99
1 in stock
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Our team can locate, cross-reference, and source all parts.
Our team can locate, cross-reference, and source all parts.
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