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onsemi MC78L15ACP
- Part No.:
- MC78L15ACP
- Manufacturer:
- onsemi
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
MC78L15ACP.pdf
- Description:
- IC REG LINEAR 15V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,222
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Product details
Overview
MC78L15ACP from ON Semiconductor is a fixed-output, 3-terminal positive linear voltage regulator delivering 15 V ±5% at up to 100 mA, featuring thermal overload protection and short-circuit current limiting in a TO-92 package. It operates across –40°C to +125°C and maintains stable regulation with ≤1.7 V dropout voltage, commonly used in low-power analog sensor interfaces and microcontroller power rails.
For engineers reviewing the MC78L15ACP datasheet, pinout, applications, or equivalent options, key selection considerations include output tolerance (±5%), thermal resistance (RθJA = 150°C/W), quiescent current (2.1–6.0 mA), and ripple rejection (34–60 dB at 120 Hz).
Technical Context
The MC78L15ACP integrates a bandgap reference, error amplifier, series pass transistor, and protection circuitry-including thermal shutdown and current limiting-within a monolithic IC. Its internal architecture ensures stable DC output without external compensation components.
It requires only two external bypass capacitors: 0.33 μF input (CI) and 0.1 μF output (CO). The device exhibits a temperature coefficient of –1.3 mV/°C and output noise of 90 μV/VO (10 Hz–100 kHz), making it suitable for noise-sensitive analog subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 15.0 V ±5% (14.25–15.75 V over full load/line/temp range) |
| Max Output Current | 100 mA continuous (limited by thermal dissipation in TO-92) |
| Dropout Voltage | 1.7 V at 25°C (minimum VI = 16.7 V for regulated 15 V output) |
| Ripple Rejection | 34–60 dB at 120 Hz (reduces AC ripple on DC supply rail) |
| Quiescent Current | 2.1–6.0 mA (low standby draw enables battery-backed operation) |
| Operating Temp | –40°C to +125°C (supports industrial and automotive under-hood environments) |
| Thermal Resistance | RθJA = 150°C/W (limits max power dissipation to ~0.75 W at TA = 25°C) |
Pinout & Package
MC78L15ACP uses the standard TO-92 through-hole package with three leads. Pin 1 is Output, Pin 2 is Ground, and Pin 3 is Input - consistent with industry-standard 78Lxx regulator pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated +15 V supply node; connects to load and output capacitor (0.1 μF) |
| 2 | GND | Common reference and return path; must be low-impedance for stability |
| 3 | Input | Unregulated DC input (≥16.7 V); connects to input capacitor (0.33 μF) |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 15 V output | Eliminates need for external feedback resistors; simplifies design and reduces BOM count |
| Thermal overload protection | Shuts down output when junction temperature exceeds 150°C, preventing permanent damage |
| Short-circuit current limiting | Clamps output current to safe level (~100–150 mA) during fault conditions |
| ±5% output tolerance | Meets industrial-grade accuracy requirements without post-production trimming |
| Low quiescent current | Enables use in always-on systems where standby power budget is constrained |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller Power Supply |
|---|---|
Use Scenario: Powering analog front-end circuits for RTD, thermocouple, or pressure sensors in PLC modules. IC Role / Device Role / Timing Role: Provides clean, stable +15 V bias for op-amps and ADC references. Use Value: ±5% output tolerance and –1.3 mV/°C tempco ensure measurement accuracy across –40°C to +85°C operating range. |
Use Scenario: Supplying core logic voltage to 8-bit MCUs (e.g., PIC16F, STM8) in embedded control units. IC Role / Device Role / Timing Role: Delivers regulated 15 V to MCU's VDD or external peripheral interface (e.g., DAC, LCD driver). Use Value: 100 mA capability supports multiple peripherals; thermal shutdown prevents latch-up during transient overloads. |
| Legacy Analog Instrumentation | Low-Power Industrial I/O Modules |
Use Scenario: Replacing aging discrete regulators in panel meters and analog chart recorders. IC Role / Device Role / Timing Role: Direct drop-in replacement for obsolete 78L15 variants in through-hole designs. Use Value: TO-92 footprint and identical pinout enable zero-layout change upgrade; RθJA = 150°C/W supports convection-cooled enclosures. |
Use Scenario: Powering isolated digital I/O channels (opto-coupled inputs/outputs) in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Supplies +15 V to optocoupler LED drivers and level-shifting buffers. Use Value: Ripple rejection ≥34 dB suppresses switching noise from adjacent DC-DC converters; 125°C max operating temp suits enclosed industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar positive linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM78L15ACZ | Same electrical specs and TO-92 package; manufactured by Texas Instruments (not ON Semi) | No functional difference; validated for same industrial temperature range and load profiles | Preferred where TI-sourced parts are required for supply chain diversification |
| MC78L15ACD | Same 15 V output but in 8-SOIC package; RθJA = 160°C/W; higher quiescent current (up to 6.5 mA) | Suitable for surface-mount designs requiring automated assembly; lower thermal margin than TO-92 | Select when board space is constrained and reflow compatibility is mandatory |
Compared with LM78L15ACZ, MC78L15ACP offers identical performance with ON Semiconductor's lifecycle support and qualification; compared with MC78L15ACD, it trades SOIC assembly convenience for better thermal performance and legacy through-hole compatibility.
Availability
MC78L15ACP is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller power rails, and legacy analog instrumentation requiring stable component supply and long-term manufacturability.
Supply support for MC78L15ACP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC78LXXA series was designed as a cost-effective, robust 100 mA linear regulator family for general-purpose analog and digital system power, emphasizing reliability, wide temperature operation, and ease of use in legacy and new designs.
FAQ
What is the maximum input voltage for MC78L15ACP?
The absolute maximum input voltage for MC78L15ACP is 35 V when the output voltage is 12 V to 15 V. For reliable operation, the recommended maximum continuous input is 30 V under typical thermal conditions. Exceeding this risks exceeding the 0.75 W power dissipation limit in the TO-92 package, especially at elevated ambient temperatures.
Does MC78L15ACP require external capacitors?
Yes, MC78L15ACP requires a 0.33 μF input capacitor (CI) and a 0.1 μF output capacitor (CO) for stability and transient response. These values are specified in the datasheet and validated across –40°C to +125°C. Omitting either capacitor may cause oscillation or poor line/load regulation in the MC78L15ACP circuit.
Is MC78L15ACP pin-compatible with older 78L15 variants?
Yes, MC78L15ACP uses the standard TO-92 pinout: Pin 1 = Output, Pin 2 = GND, Pin 3 = Input - matching LM78L15ACZ, KA78L15A, and other legacy 78L15 devices. This allows direct substitution in existing through-hole PCB layouts without modification.
What is the dropout voltage specification for MC78L15ACP?
The dropout voltage for MC78L15ACP is 1.7 V at 25°C and 40 mA load, meaning the input must be at least 16.7 V to maintain regulated 15 V output. This value remains stable across temperature and load, enabling predictable minimum input design margins in the MC78L15ACP application.
How does thermal protection work in MC78L15ACP?
MC78L15ACP incorporates an internal thermal shutdown circuit that disables the output when junction temperature reaches approximately 150°C. Once the die cools by ~20°C, the regulator automatically resumes operation. This protects the MC78L15ACP from permanent damage during sustained overload or inadequate heatsinking.
MC78L15ACP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 15V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
MC78L15ACP FAQ
1.How can I place an order for MC78L15ACP through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L15ACP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC78L15ACP reliable?
The price and inventory of MC78L15ACP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L15ACP is usually 5 days.
3.What payment methods are accepted for MC78L15ACP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L15ACP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L15ACP?
MC78L15ACP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L15ACP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC78L15ACP?
For technical support, including MC78L15ACP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L15ACP requirements.
6.How does Aetrix verify that MC78L15ACP is sourced from the original manufacturer or authorized distributors?
All MC78L15ACP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC78L15ACP meets industry standards.
7.What is the process for return or replacement of MC78L15ACP?
All MC78L15ACP units undergo pre-shipment inspection (PSI). If there is an issue with MC78L15ACP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC78L15ACP part is unused and in its original packaging.
Return procedure for MC78L15ACP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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