Product Overview
Motorola MC79L15CP - Negative 15V 100mA Regulator, TO-92
Condition
Used. The photo shows a representative unit from our stock.
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Product Overview
The MC79L15CP is a three-terminal fixed negative 15 V regulator from the 100 mA 79L family, the low-current relative of the 1.0 A MC7900 parts.
We are shipping these out of a bin of 294, sold each. The representative unit photographed is a small black TO-92 lettered in three lines across the flat face: MC79L on the top line, 15CP under it, A147 at the bottom. Its rounded rear face carries nothing but a small circled mold mark, and no Motorola batwing is visible on this package style in these photos, so the MC79L prefix is the brand evidence the body itself gives. All three leads are full length, straight and bright, untrimmed and never cut down to a board. We do not decode A147: no Motorola-published marking guide sits behind the data we work from, so we read no date out of that string and quote none. A 79L15 bought new today comes from onsemi, the successor to Motorola's semiconductor business, which is why a Motorola-lettered MC79L 15CP body is worth saying out loud rather than glossing over.
Key Features
- Fixed negative 15 V output
- 100 mA low-current family; the "L" designates the 100 mA series, a separate datasheet from the 1.0 A parts (per onsemi's published MC79L00A series data)
- Internal short-circuit current limiting and thermal overload protection (per onsemi)
- Typical dropout 1.7 V at IO = 40 mA (per onsemi)
- TO-92 (TO-226) plastic package, CASE 29-10, indicated by the "P" suffix (per onsemi)
- Through-hole mount, three straight leads
- "C" suffix: commercial junction-temperature grade, TJ = 0 degC to +125 degC (per onsemi)
- Complementary positive series is the MC78L00 (per onsemi)
- Verify against onsemi's published MC79L00A series data before designing in.
Applications
- Negative rail for op-amp and analog front-end supplies
- Split-supply instrument boards needing a low-current -15 V
- Repair and restoration of legacy gear built around 79L regulators
- Prototyping and classroom supplies on standard TO-92 footprints
Frequently Asked Questions
How many should I order?
Order the count your build actually needs, plus a spare or two for the ones that go missing on the bench. With 294 in the bin, quantity is not the constraint here, and a handful for a repair run leaves the bin barely dented. Shipping is $8 flat rate and free on orders over $28, so small parts like this ship smartest as part of a larger order.
Will it drop into a footprint wired for a 78xx part?
Treat that as a no. This is a negative regulator, and the positive 78xx and negative 79xx families do not share a pin assignment. We are not quoting a TO-92 pin order for this part, because we do not have one from published data to quote. Confirm the pin assignment against onsemi's published MC79L00A series data before you power the board. The leads on these ship full length and unbent, so there is room to form them once you have that answer in front of you.
Small enough to lose in a shirt pocket, and content to hold a negative rail steady on somebody's bench for another thirty years.
