Product Overview
Motorola MC79L05ACP - Negative 5V 100mA Regulator, TO-92
Condition
Used. The photo shows a representative unit from our stock.
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Product Overview
The MC79L05ACP is a three-terminal fixed negative 5 V regulator from the 100 mA 79L family rather than the 1.0 A MC7900 parts.
Fifteen of these are on the shelf, sold each. The representative unit photographed is a black TO-92 lettered in three lines on the flat face: MC79L on the top line, 05ACP under it, M649 at the bottom. The rounded rear face shows only a small circled mold mark, and no Motorola batwing is visible on this package style in these photos, so the MC79L prefix and that A ahead of the grade letter are what the body itself tells you about what you are buying. The leads are long, straight and bright, untrimmed and unbent. We put no date behind M649: there is no Motorola-published marking guide in the data we work from, so that string stays a string. Buy a 79L05A new now and it arrives from onsemi, the successor to Motorola's semiconductor business; these are the Motorola-era bodies instead, and fifteen is what there is of them.
Key Features
- Fixed negative 5 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)
- "A" ahead of the grade letter denotes the tighter-tolerance version (per onsemi)
- 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" grade letter: commercial junction-temperature grade, TJ = 0 degC to +125 degC (per onsemi)
- Verify against onsemi's published MC79L00A series data before designing in.
Applications
- Low-current -5 V rail alongside a positive 5 V supply
- Analog front ends and op-amp sections needing a modest negative supply
- Repair of legacy boards built around 79L regulators
- Breadboard and prototype supplies on TO-92 footprints
Frequently Asked Questions
How many should I order?
Order the count the build needs. Fifteen is the whole shelf here rather than a deep bin, so the listed count is the real one; put any spares on the same order instead of splitting them across two. Shipping is $8 flat rate and free on orders over $28, so small parts like this ship smartest as part of a larger order.
What does the A in MC79L05ACP mean?
Per onsemi's published data, an "A" ahead of the grade letter denotes the tighter-tolerance version of the part, and the "C" that follows is the commercial junction-temperature grade, TJ = 0 degC to +125 degC. The final "P" is the TO-92 package. That A is printed on the body of the unit photographed, in the 05ACP line, so you are not taking the suffix on our word alone. One thing to keep separate from all that: this is a negative regulator, and the positive and negative 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, so check onsemi's published MC79L00A series data against your board before wiring it in.
Three leads and a grain of black plastic, doing the negative side of the job for less than the cost of the coffee you drank while soldering it.
