Product Overview
SGS 12020-E in a TO-3 Metal Can - Unused Stock, Every Marking Photographed
Condition
New, unused. The can is a diamond-flange TO-3 (TO-204AA) metal package. The top of the can is stamped with the interlocking SGS logo over "12020-E" and, below that, "48540". The strike is shallow and low in contrast - the "-E" suffix is only partially struck and the "48540" line is faint, so read the photos closely rather than take our word for it. On the pin side, the two leads are straight and bright, seated in intact glass-to-metal seals, with no solder on them and no bends. The bare bright metal flange shows only the light mottling and faint surface marks normal for factory handling of unused stock, and both mounting holes are clean and unmarked. No corrosion, no heatsink compound, no mounting scratches. 16 pieces available.
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Product Overview
This is an SGS-marked device in a TO-3 metal can, carrying the number 12020-E with a secondary marking of 48540. SGS is SGS-ATES, the Italian semiconductor maker that merged with Thomson in 1987 to become SGS-Thomson and is known today as STMicroelectronics, so the marking places this can firmly in the pre-1987 SGS era. What we cannot tell you is what is inside it. The 12020-E number does not match a standard catalog designation we can confirm, and numbers like it were often assigned for a specific customer or production line rather than a published part. The package gives no answer either: two pins plus the case as a third terminal is the arrangement used by three-terminal regulators and by classic power transistors alike, so the pin count does not settle the question. This listing has carried a question mark on the device type for years and we are keeping it honest rather than guessing. Device type and all electrical ratings are not confirmed - verify by datasheet or bench identification before designing it into anything.
Key Features
- Marking on can top: SGS logo, "12020-E", "48540"
- Package: TO-3 / TO-204AA diamond-flange metal can
- Terminals: two pins in glass-to-metal seals, plus the metal case
- Mounting: two flange holes on the standard TO-3 pattern, fits common TO-3 sockets and heatsinks
- Manufacturer: SGS (SGS-ATES, Italy, pre-1987 marking style)
- Condition: new, unused stock, not electrically tested
- Quantity available: 16 pieces
- Device type, voltage, current, and pinout: not confirmed - verify against a datasheet or bench test before use
Applications
- Restorer rebuilding a vintage Italian-built amplifier or power supply who needs an original SGS-marked TO-3 for a visually correct repair
- Bench technician with a curve tracer who is willing to identify an unknown TO-3 device and put a solved mystery on the shelf
- Collector of SGS-ATES silicon who is buying the marking and the era rather than a datasheet
- Instructor or display builder who needs an authentic SGS-marked TO-3 metal can for teaching package styles and mounting hardware
Frequently Asked Questions
What exactly is a 12020-E?
We do not know, and we will not guess. The can is marked SGS 12020-E 48540 and that is the whole of the documented evidence. We could not tie the number to a published SGS catalog part. If you can identify it, you will know more about it than we do.
Is it a voltage regulator?
It has been cataloged here as a possible voltage regulator, with a question mark, since it was first listed. Nothing in the photos confirms that. A TO-3 can with two pins and a case terminal is equally consistent with a three-terminal regulator and with a power transistor. Treat the device type as unverified until you test it.
What does the 48540 marking mean?
Unknown. It is a second line stamped below the part number, faintly struck and only partially legible in the photo. It is most likely a lot or trace code, but we have not confirmed that, so take it as a marking rather than a specification.
Has it been tested?
No. It is being sold as unused stock based on its physical condition, not on any electrical measurement. There is no test data on this part. Buy it to identify and evaluate, not to drop into a critical circuit sight unseen.
Why buy one or two of these instead of a bulk lot on eBay or Amazon?
Because an unknown TO-3 is exactly the kind of part you want one or two of, not fifty. PartsMine ships the exact quantity you ask for. Shipping is $8 flat rate and free over $28, so a couple of pieces for a bench identification or a single repair usually costs less delivered than a forced-quantity lot. Same or next business day shipping from Idaho.
SGS stamped its name on this can, added a number and a lot code, and sealed the rest inside. Decades later it is still unopened and still unexplained, waiting on someone with a curve tracer and a free afternoon to finally say what it is.
