Product Overview
Motorola MC7812CT - Fixed Positive 12V Regulator, TO-220
Condition
Used. Excellent condition with nothing out of the ordinary observed during visual inspection. Acquired from an impressive private collection built over decades. No signs of damage or modification noted. The photo shows a representative unit from our stock.
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Product Overview
The MC7812CT is a monolithic fixed positive 12 V regulator in the three-lead TO-220 package, from the MC7800 series.
Twenty-one of them came out of that collection and are sold each. The representative unit photographed carries the Motorola batwing beside a round factory stamp, with MC on the first line, 7812CT on the second and QWW116 on the third, the white lettering still sharp against the black body. Its three leads are full length, straight and bright, and the tab is bare metal with a clear mounting hole in these photos. QWW116 stays a marking and not a date in our copy, because no Motorola-published marking guide sits behind the data we work from. What a new part will not give you is that batwing: a 7812CT from current production comes from onsemi, the successor to Motorola's semiconductor business.
Key Features
- Fixed positive 12 V output
- Output current in excess of 1.0 A with adequate heatsinking; peak output current typ 2.2 A at TJ = 25 degC (per onsemi's published MC7800 series data)
- Ripple rejection rated 60dB at 1kHz
- No external components required; internal thermal overload protection, short-circuit current limiting and safe-area compensation (per onsemi)
- Output voltage offered in 1.5%, 2% and 4% tolerance grades across the series (per onsemi)
- TO-220 package, CASE 221AB, indicated by the "T" suffix (per onsemi)
- Through-hole mount, three leads, metal tab with mounting hole
- "C" suffix: commercial junction-temperature grade, TJ = 0 degC to +125 degC (per onsemi)
- Verify against onsemi's published MC7800 series data before designing in.
Applications
- 12 V regulated rails in industrial control panels
- Linear bench power supply builds
- Repair or restoration of legacy electronics using a 7812
- Audio and signal sections needing a fixed 12 V supply
Frequently Asked Questions
How many should I order?
Order the count the build needs. There are 21 here, all out of the same collection, so if a repair run or a batch of boards calls for several, take them on one order while they are together. Shipping is $8 flat rate and free on orders over $28, so small parts like this ship smartest as part of a larger order.
How much input voltage will it take?
onsemi's published MC7800 series data gives a maximum input voltage of 35 V for the 5 V through 18 V devices, which covers the 12 V part, and a maximum junction temperature of +150 degC with a storage range of -65 to +150 degC. That is the headroom ceiling, not a recommendation: the wider the gap between input and the 12 V output, the more heat the package has to shed. Verify the limits against onsemi's published MC7800 series data for your operating conditions. The tab on the unit photographed is bare metal with a clear mounting hole, ready for an ordinary TO-220 insulator kit; what ships is the regulator alone, with no mounting hardware or insulator included.
Pulled from a collection somebody spent decades building, still lettered clean, still ready to hold twelve volts steady in a cabinet nobody opens.
