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onsemi MC7824ACT
- Part No.:
- MC7824ACT
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7824ACT.pdf
- Description:
- IC REG LINEAR 24V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,069
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Product details
Overview
MC7824ACT from onsemi is a fixed-output, 24 V, 1.0 A positive linear voltage regulator in TO-220 package with internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It delivers stable 24 V output across 5 mA–1.0 A load range with ≤2.0 V dropout at full load, supporting local regulation in industrial power supplies, motor control logic, and embedded system rails.
For engineers reviewing the MC7824ACT datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, PCB layout guidance for heatsinking, and validated alternative options for cost, availability, or qualification-sensitive designs.
Technical Context
The MC7824ACT employs a monolithic bipolar pass transistor with built-in safe-area compensation to maintain SOA integrity under high VIN–VOUT differentials. Its internal current limit is fixed at 0.2 A (short-circuit) and peak output reaches 2.2 A under pulse conditions.
Thermal protection activates at +150°C junction temperature, and ripple rejection is 54 dB at 120 Hz with 28–38 V input. Output noise is 10 µV/V RMS (10 Hz–100 kHz), and load regulation holds within ±2.1 mV over 5 mA–1.5 A at TJ = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 24 V nominal, ±2% tolerance (23.2–25.8 V over load/temperature) |
| Output Current | 1.0 A continuous, 2.2 A peak - supports motor drivers and PLC I/O modules |
| Dropout Voltage | 2.0 V at 1.0 A - requires minimum 26.0 V input for regulated 24 V output |
| Ripple Rejection | 54 dB at 120 Hz - suppresses rectified AC ripple in unregulated DC inputs |
| Quiescent Current | 3.6–6.0 mA - enables low-standby-power operation in always-on systems |
| Thermal Shutdown | Activates at +150°C junction - prevents catastrophic failure during overload or poor heatsinking |
| Short-Circuit Limit | 0.2 A - protects upstream supply and PCB traces during output faults |
Pinout & Package
MC7824ACT uses the standard TO-220 package (Case 221AB), with the metal tab (heatsink surface) electrically connected to Pin 2 (Ground). Adequate heatsinking is required for >500 mA continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input (27.3–38 V); must exceed 26.0 V to sustain 24 V output at 1.0 A |
| Pin 2 | Ground | Common reference for input and output; also tied to heatsink tab - isolation required if heatsink is chassis-grounded |
| Pin 3 | Output | Regulated +24 V supply; bypass capacitor (≥0.33 µF) recommended at point-of-load |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation - eliminates need for feedback resistors or compensation networks |
| Internal thermal overload protection | Automatic shutdown at +150°C junction; resumes after cooldown - no external thermal sensor needed |
| Safe-area compensated pass transistor | Reduces short-circuit current as VCE increases - prevents second breakdown during fault conditions |
| 1.5% to 4% output tolerance options | MC7824ACT is 2% grade - meets precision requirements for industrial analog front-ends and sensor excitation |
| Pb-free and RoHS-compliant | Meets environmental compliance for global industrial and automotive production |
Applications
| Industrial Power Supply | Motor Control Logic Rail |
|---|---|
|
Use Scenario: Provides clean +24 V bias for PLC digital I/O modules and relay drivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary local regulator converting bulk 32 VDC bus to isolated 24 V logic rail. Use Value: Internal short-circuit protection avoids fuse replacement during field wiring faults; 2.0 V dropout allows use with aging or undersized upstream supplies. |
Use Scenario: Powers microcontroller, gate driver ICs, and position encoder interfaces in servo amplifier boards. IC Role / Device Role / Timing Role: Stable 24 V reference for level-shifting and optocoupler biasing in isolated control domains. Use Value: 54 dB ripple rejection ensures clean logic supply despite switching noise from adjacent PWM stages; TO-220 package enables direct bolt-down heatsinking. |
| Embedded System Main Rail | Test Equipment Auxiliary Supply |
|
Use Scenario: Supplies core logic and communication peripherals (RS-485 transceivers, CAN controllers) in ruggedized edge devices. IC Role / Device Role / Timing Role: Fixed-output LDO delivering 1.0 A at 24 V with minimal board area and BOM count. Use Value: 10 µV/V output noise preserves signal integrity for ADC references and analog sensor conditioning circuits. |
Use Scenario: Generates calibrated +24 V output for powering DUTs (devices under test) in benchtop functional testers. IC Role / Device Role / Timing Role: Precision voltage source with known line/load regulation for calibration traceability. Use Value: ±2% output tolerance and <±2.1 mV load regulation enable repeatable test conditions without external trimming. |
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 |
|---|---|---|---|
| LM7824CDT/NOPB (TI) | Same 24 V/1.0 A spec, but 2.5 V dropout and 45 dB ripple rejection; TO-220 package with isolated tab | Lower ripple rejection limits use in noisy switcher-derived inputs; higher dropout reduces usable input range | Select when TI qualification or dual-sourcing is required; verify heatsink isolation due to non-grounded tab |
| NCV7824BD2T (onsemi) | Automotive-grade variant (AEC-Q100 qualified), same 2.0 V dropout and 54 dB ripple rejection, D2PAK-3 package | D2PAK enables automated SMT assembly and higher thermal conductivity via PCB copper; rated for -40°C to +150°C | Choose for automotive or extended-temperature industrial designs where reflow compatibility and qualification are mandatory |
Compared with LM7824CDT/NOPB, MC7824ACT offers superior ripple suppression and lower dropout for tighter input margins; versus NCV7824BD2T, it provides through-hole assembly flexibility and identical thermal protection behavior but lacks AEC-Q100 certification.
Availability
MC7824ACT is available at Aetrix Electronics and suitable for industrial power supplies, motor control logic rails, and embedded system main rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MC7824ACT 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 is a global semiconductor manufacturer specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The MC7800 series - including MC7824ACT - was designed for robust, drop-in local regulation in harsh environments, emphasizing thermal resilience, fault tolerance, and minimal external component count.
FAQ
What is the minimum input voltage required for MC7824ACT to regulate 24 V at 1.0 A?
The MC7824ACT requires a minimum input voltage of 26.0 V to maintain 24 V output at 1.0 A load, based on its guaranteed 2.0 V dropout specification at TJ = 25°C. At elevated temperatures or higher current transients, design margin should include ≥27.3 V input per datasheet conditions.
Does MC7824ACT require an input bypass capacitor?
Yes - MC7824ACT requires a minimum 0.33 µF input bypass capacitor (tantalum, mylar, or low-ESR ceramic) placed directly across Pins 1 and 2. This stabilizes operation under high-frequency noise and long-trace input conditions, preventing oscillation or line-transient-induced dropout.
Can MC7824ACT be used in parallel for higher current?
No - MC7824ACT is not designed for parallel operation. Its output voltage tolerance (±2%) and lack of current-sharing circuitry make load imbalance likely, risking thermal runaway. For >1.0 A, use a single higher-current regulator or a switching solution instead.
What is the thermal resistance junction-to-case (RJC) for MC7824ACT?
The thermal resistance junction-to-case (RJC) for MC7824ACT in TO-220 package is 5.0°C/W, as specified in the Absolute Maximum Ratings table. This value assumes proper mechanical mounting to a heatsink with thermal interface material; actual thermal performance depends on heatsink size and airflow.
Is MC7824ACT compatible with lead-free soldering processes?
Yes - MC7824ACT is Pb-free and RoHS-compliant, qualified for standard lead-free reflow profiles (JEDEC J-STD-020). The TO-220 package withstands peak temperatures up to 260°C for 20–40 seconds, matching typical Pb-free process requirements.
MC7824ACT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 61dB (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-220
MC7824ACT FAQ
1.How can I place an order for MC7824ACT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7824ACT 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 MC7824ACT reliable?
The price and inventory of MC7824ACT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7824ACT is usually 5 days.
3.What payment methods are accepted for MC7824ACT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7824ACT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7824ACT?
MC7824ACT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7824ACT 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 MC7824ACT?
For technical support, including MC7824ACT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7824ACT requirements.
6.How does Aetrix verify that MC7824ACT is sourced from the original manufacturer or authorized distributors?
All MC7824ACT 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 MC7824ACT meets industry standards.
7.What is the process for return or replacement of MC7824ACT?
All MC7824ACT units undergo pre-shipment inspection (PSI). If there is an issue with MC7824ACT, 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 MC7824ACT part is unused and in its original packaging.
Return procedure for MC7824ACT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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