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onsemi MC78L24ACPRP
- Part No.:
- MC78L24ACPRP
- Manufacturer:
- onsemi
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
MC78L24ACPRP.pdf
- Description:
- IC REG LINEAR 24V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,576
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Product details
Overview
MC78L24ACPRP from onsemi is a 100 mA, fixed +24 V positive linear voltage regulator in TO-92 package with internal short-circuit and thermal overload protection. It delivers stable output under input voltages up to 38 V, requires no external components for basic operation, and is rated for 0°C to +125°C junction temperature - commonly used in industrial power supplies and sensor interface circuits.
For engineers reviewing the MC78L24ACPRP datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (1.7 V typ), load regulation (20 mV max at ≤40 mA), ripple rejection (45 dB typ), thermal resistance (200°C/W), and TO-92 mechanical compatibility in space-constrained PCB layouts.
Technical Context
The MC78L24ACPRP implements a monolithic series-pass transistor regulator architecture with built-in current limiting and thermal shutdown circuitry. Its feedback network is trimmed internally to deliver a nominal 24 V output with ±4.2% tolerance over temperature and load.
It operates without external compensation capacitors in most low-current applications but benefits from 0.33 µF input and 0.1 µF output bypass capacitors when mounted remotely from bulk filtering or driving dynamic loads. Dropout is defined at 2% VO deviation, with VI − VO = 1.7 V typical at TJ = +25°C and IO = 40 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 24 V nominal, 22.8–25.2 V over line/load/temperature (ensures stable rail for 24 V logic or analog stages) |
| Max Output Current | 100 mA continuous (supports low-power microcontrollers, op-amps, or sensors) |
| Dropout Voltage | 1.7 V typical at 40 mA (requires ≥25.7 V input for regulated 24 V output) |
| Ripple Rejection | 45 dB typical at 120 Hz (attenuates transformer-rectifier ripple by ~178×) |
| Load Regulation | 20 mV max (0–40 mA load change), 100 mV max (0–100 mA) - critical for precision biasing |
| Thermal Resistance | 200°C/W junction-to-ambient (TO-92, no heatsink) - limits power dissipation to ~312 mW at TA = 25°C |
| Operating Temp | 0°C to +125°C junction - suitable for non-automotive industrial environments |
Pinout & Package
MC78L24ACPRP uses the standard TO-92 (Case 029) plastic package with 3 leads and Pb-free finish. Pin 1 is Output, Pin 2 is Ground, Pin 3 is Input - verified per datasheet Figure 1 and ordering table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Left, when flat side faces viewer) | Output (VOUT) | Regulated +24 V supply node; connects directly to load and local decoupling capacitor |
| 2 (Center) | Ground (GND) | Common reference for input and output; must be low-impedance path to minimize noise and regulation error |
| 3 (Right) | Input (VIN) | Unregulated DC input; must exceed 25.7 V minimum under worst-case load and ripple conditions |
Key Features
| Feature | Design Value |
|---|---|
| Internal short-circuit current limiting | Prevents destructive fault currents during output shorts - no external fuse required |
| Thermal overload protection | Shuts down regulator above ~150°C junction temperature - enables safe recovery after transient overloads |
| No external components needed | Enables minimal BOM count and compact layout for point-of-load regulation |
| Pb-free TO-92 packaging | Complies with RoHS; compatible with standard through-hole reflow or hand-solder processes |
| Low quiescent current | Typical 3.1 mA at 25°C - improves efficiency in battery-backed or standby systems |
Applications
| Industrial Sensor Power | Legacy Control System Rail |
|---|---|
Use Scenario: Powering 4–20 mA current-loop transmitters and analog front-end ICs in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 24 V supply regulator delivering clean, stable voltage to signal conditioning circuitry. Use Value: Maintains 24 V within ±2.2% across 1–100 mA load and 0–125°C ambient - ensures transmitter accuracy and ADC reference stability. | Use Scenario: Replacing aging 7824 regulators in PLC I/O modules and motor drive control boards. IC Role / Device Role / Timing Role: Fixed-voltage linear regulator providing isolated 24 V logic and relay coil supply. Use Value: Drop-in replacement with identical TO-92 footprint and pinout; same thermal derating behavior simplifies legacy redesign. |
| Low-Power Microcontroller Supply | Test Equipment Bias Source |
Use Scenario: Supplying 24 V to ultra-low-power MCU-based data loggers operating from unregulated wall adapters. IC Role / Device Role / Timing Role: Local regulation stage converting noisy 28–32 V adapter output to clean 24 V system rail. Use Value: 45 dB ripple rejection suppresses switching noise from upstream AC/DC converters - prevents MCU reset glitches. | Use Scenario: Generating precise 24 V bias for calibration references and op-amp test fixtures in bench instrumentation. IC Role / Device Role / Timing Role: Stable DC source with low output noise (200 µV RMS) for sensitive measurement circuits. Use Value: 200 µV output noise (10 Hz–100 kHz) avoids introducing error into µV-level measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78L24ACP | Same electrical specs and TO-92 package; differs only in packaging format (bulk vs. tape-and-reel) | No functional difference; MC78L24ACP is bag-packed, while MC78L24ACPRP is tape-and-reel - identical for prototyping or production | Select MC78L24ACPRP for automated SMT placement; choose MC78L24ACP for manual assembly or small-batch builds |
| LM78L24ACZ | Pin-compatible TO-92 device; wider output tolerance (±5%), higher dropout (2.0 V min), lower ripple rejection (35 dB) | Suitable for less demanding applications where tighter regulation or noise performance is not required | Use LM78L24ACZ only if cost sensitivity outweighs need for 24 V accuracy and noise immunity |
Compared with MC78L24ACP, MC78L24ACPRP offers identical performance in tape-and-reel form factor for pick-and-place manufacturing; versus LM78L24ACZ, it provides tighter output tolerance, lower dropout, and superior ripple rejection - making it preferable for precision industrial power rails.
Availability
MC78L24ACPRP is available at Aetrix Electronics and suitable for industrial sensor power, legacy control system rail generation, and low-power microcontroller supply requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MC78L24ACPRP 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The MC78LxxA series was designed specifically for cost-sensitive, low-power linear regulation in industrial and consumer equipment - emphasizing ruggedness, simplicity, and wide temperature operation without external components.
FAQ
What is the maximum input voltage for MC78L24ACPRP?
The absolute maximum input voltage for MC78L24ACPRP is 40 V DC, as specified in the Absolute Maximum Ratings table. For reliable operation within specifications, the recommended maximum continuous input is 38 V - exceeding this risks thermal overload or reduced lifetime, especially at high ambient temperatures or load currents.
Does MC78L24ACPRP require input and output capacitors?
MC78L24ACPRP does not require external capacitors for basic stability, but a 0.33 µF input capacitor is recommended when the regulator is located more than a few inches from the main filter capacitor, and a 0.1 µF output capacitor improves transient response. These values are confirmed in the Standard Application schematic (Figure 2) and Applications Information section.
What is the thermal resistance of MC78L24ACPRP in its TO-92 package?
The thermal resistance, junction-to-ambient (RJA), for MC78L24ACPRP in the TO-92 package is 200°C/W under standard mounting conditions with no heatsink. This value is explicitly listed in the Thermal Characteristics table on page 2 of the datasheet and defines safe power dissipation limits across ambient temperature ranges.
Is MC78L24ACPRP suitable for automotive applications?
MC78L24ACPRP is not qualified for automotive use. It is rated for 0°C to +125°C junction temperature, whereas automotive-grade variants like NCV78L24ABPRPG carry AEC-Q100 qualification and extended −40°C to +125°C operation. The "C" suffix in MC78L24ACPRP denotes commercial temperature grade, not automotive.
What is the output voltage tolerance of MC78L24ACPRP at room temperature?
At TJ = +25°C, the output voltage of MC78L24ACPRP is specified as 23 V minimum to 25 V maximum - a ±4.2% tolerance around the nominal 24 V. This is confirmed in the Electrical Characteristics table for MC78L24AC on page 6 of the datasheet, under "Output Voltage (TJ = +25°C)".
MC78L24ACPRP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 24V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 45dB (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 (TO-226)
MC78L24ACPRP FAQ
1.How can I place an order for MC78L24ACPRP through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L24ACPRP 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 MC78L24ACPRP reliable?
The price and inventory of MC78L24ACPRP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L24ACPRP is usually 5 days.
3.What payment methods are accepted for MC78L24ACPRP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L24ACPRP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L24ACPRP?
MC78L24ACPRP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L24ACPRP 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 MC78L24ACPRP?
For technical support, including MC78L24ACPRP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L24ACPRP requirements.
6.How does Aetrix verify that MC78L24ACPRP is sourced from the original manufacturer or authorized distributors?
All MC78L24ACPRP 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 MC78L24ACPRP meets industry standards.
7.What is the process for return or replacement of MC78L24ACPRP?
All MC78L24ACPRP units undergo pre-shipment inspection (PSI). If there is an issue with MC78L24ACPRP, 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 MC78L24ACPRP part is unused and in its original packaging.
Return procedure for MC78L24ACPRP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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