Product Overview
Three-Terminal -15V Fixed Power Supply Regulator, Case 29 TO-92
Condition
New old stock (NOS). Unused surplus component with straight, untrimmed through-hole wire leads free of solder. Markings legible across three lines on the flat face: MC79L, 15CP, and Motorola logo with date code 147. Rear face features a circular mold mark with embossed X.
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Product Overview
Motorola MC79L15CP is a three-terminal fixed negative linear voltage regulator designed to deliver -15 V at load currents up to 100 mA. Housed in a standard TO-92 plastic package, it provides local on-card regulation for analog circuitry, dual-rail operational amplifier supplies, and instrumentation systems requiring a stable negative reference.
Key Features
- Fixed negative output: -15 V (±10% tolerance)
- Output current capability: up to 100 mA
- Input voltage operating range: -17.5 V to -35 V
- Package: 3-lead TO-92 through-hole (Case 29)
- Pinout configuration: Pin 1 Ground, Pin 2 Input, Pin 3 Output
- Internal thermal overload protection and short-circuit current limiting
Applications
- Biasing dual-rail op-amp circuits and audio preamplifiers requiring a dedicated -15V rail alongside a positive regulator
- Replacing degraded negative regulators on legacy test equipment and industrial control boards
- Regulating negative supply rails on DIY modular synthesizer modules, analog filters, and Eurorack sub-circuits
Frequently Asked Questions
What is the pinout for the Motorola MC79L15CP in the TO-92 package?
Looking at the flat face of the package with the leads pointing downward, Pin 1 (left) is Ground, Pin 2 (center) is Input, and Pin 3 (right) is Output. This layout differs from positive regulators like the 78L series, so verify circuit connections before soldering.
Does the MC79L15CP require an external heat sink?
No external heat sink is required when operating within its 100 mA rating under normal ambient conditions. Built-in thermal overload and short-circuit protection circuits automatically limit current if internal junction temperatures rise too high.
Can I purchase just the exact quantity of regulators needed for my project?
Yes. These regulators are sold individually so you can order precisely what your repair or build requires without paying for excess components. For larger projects, more pieces cost less each, and the price-break table on this page shows what each quantity costs. Orders ship for an $8 flat rate, ship free at $28 or more, and leave our Idaho warehouse the same or next business day.
Every clean audio signal and balanced op-amp rail depends on quiet negative voltage doing its job in the background. Solder it in, fire up the bench supply, and let the circuit do the talking.
