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onsemi MC7824BT
- Part No.:
- MC7824BT
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7824BT.pdf
- Description:
- IC REG LINEAR 24V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,744
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Product details
Overview
MC7824BT 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, and is used for local regulation in industrial power supplies, motor control logic, and embedded system auxiliary rails.
For engineers reviewing the MC7824BT datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs (VO = 23.2–25.8 V, RR = 45–54 dB, TCVO = −2.0 mV/°C), thermal performance (RθJA = 92 °C/W), package dimensions, real-world design constraints (min input = 27.3 V), and validated alternatives for supply continuity planning.
Technical Context
The MC7824BT implements a monolithic series-pass transistor architecture with built-in protection circuitry: thermal overload detection triggers shutdown above +150°C junction temperature, while short-circuit current limiting holds peak output at 0.2 A under Vin = 35 V fault conditions. Safe-area compensation dynamically reduces short-circuit current as pass transistor VCE increases.
It operates without external components for basic regulation but requires ≥0.33 µF input bypass capacitor when located >10 cm from bulk filter. Output stability is independent of output capacitance, though ≥0.1 µF improves transient response. Ripple rejection is specified at 120 Hz (45–54 dB) and degrades above 1 kHz per Figure 4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 24 V nominal; 23.2–25.8 V over 5 mA–1.0 A load and −40°C to +125°C TJ (ensures ±3.5% tolerance in industrial environments) |
| Output Current | 1.0 A continuous; 2.2 A peak (supports brief inrush during relay or solenoid activation) |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C (requires minimum 27.3 V input for regulated 24 V output) |
| Ripple Rejection | 45–54 dB at 120 Hz (attenuates 120 Hz rectified ripple by ≥177×; insufficient for high-frequency switching noise) |
| Quiescent Current | 3.6–6.0 mA (low standby draw enables use in always-on monitoring circuits) |
| Thermal Resistance | RθJA = 92 °C/W (requires heatsink for >0.5 W dissipation; RθJC = 5.0 °C/W supports direct case-mount cooling) |
| Operating Junction Temp | +150°C max (enables operation in sealed enclosures up to +85°C ambient with adequate heatsinking) |
Pinout & Package
MC7824BT uses TO-220 package (Case 221AB), with metal tab electrically connected to Pin 2 (Ground). Heatsink surface must be isolated or grounded via Pin 2 only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Unregulated DC input; must exceed 27.3 V for full-load 24 V output; bypass with ≥0.33 µF capacitor near pin |
| 2 | Ground | Common reference for input and output; metal tab connection requires isolation unless tied to system ground |
| 3 | Output | Regulated 24 V supply; no output capacitor required for stability, but ≥0.1 µF improves load-step response |
Key Features
| Feature | Design Value |
|---|---|
| Internal Thermal Shutdown | Automatically disables output above +150°C TJ, preventing permanent damage during sustained overload or poor heatsinking |
| Short-Circuit Current Limit | Holds output at ≤0.2 A during output-to-ground faults, limiting power dissipation to safe levels even at 35 V input |
| No External Components Required | Operates as standalone regulator-no feedback resistors, compensation networks, or sense lines needed for basic 24 V supply |
| Safe-Area Compensation | Reduces short-circuit current as pass transistor VCE rises, preventing second breakdown during high-VIN/low-VOUT fault conditions |
| Pb-Free Construction | RoHS-compliant packaging meets industrial environmental compliance requirements without derating or process changes |
Applications
| Industrial PLC I/O Power | Motor Driver Logic Supply |
|---|---|
|
Use Scenario: Powers digital input/output modules in programmable logic controllers where 24 V DC is standard for sensor interfacing and relay actuation. IC Role / Device Role / Timing Role: Primary 24 V local regulator supplying isolated optocoupler bias, level-shifting buffers, and microcontroller I/O rails. Use Value: Maintains tight 24 V regulation (±3.5%) across wide temperature and load swings, ensuring reliable signal detection in noisy factory environments. |
Use Scenario: Supplies gate drivers and logic circuitry for H-bridge motor controllers in automated machinery. IC Role / Device Role / Timing Role: Clean, low-noise 24 V rail for PWM timing ICs, current-sense amplifiers, and isolated communication interfaces (e.g., RS-485 transceivers). Use Value: 45–54 dB ripple rejection suppresses 120 Hz rectifier noise, preventing false triggering of gate drivers during AC line transients. |
| Embedded System Auxiliary Rail | Test Equipment Bench Supply |
|
Use Scenario: Generates secondary 24 V supply for analog front-ends, ADC references, or fan controllers in networked edge devices. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling main SMPS output, reducing noise coupling into sensitive analog sections. Use Value: 1.4 mΩ output impedance at 1 kHz ensures minimal voltage sag during 100 mA step loads, preserving ADC accuracy. |
Use Scenario: Used in benchtop power supply modules requiring stable, adjustable 24 V output with built-in protection. IC Role / Device Role / Timing Role: Core regulation element in linear lab supplies, often paired with external pass transistors for higher current. Use Value: Peak 2.2 A capability allows brief overloads during equipment startup; thermal shutdown prevents damage during user misconfiguration. |
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 |
|---|---|---|---|
| LM7824CT | Same 24 V output, 1.0 A rating, TO-220 package; ±4% output tolerance vs. MC7824BT's ±3.5%; lower ripple rejection (40 dB typical) | Less stringent regulation stability; suitable for non-critical 24 V loads like indicator LEDs or fans | Select LM7824CT only if ±4% VO tolerance and reduced PSRR are acceptable; verify thermal margin with same heatsink. |
| NCV7824BD2T | Automotive-grade variant (AEC-Q100 qualified); identical electrical specs but enhanced ESD (2 kV HBM) and extended temp range (−40°C to +150°C) | Required for automotive body control modules, infotainment power rails, or harsh-environment industrial deployments | Choose NCV7824BD2T when automotive qualification, extended temperature operation, or higher ESD immunity is mandatory. |
Compared with LM7824CT and NCV7824BD2T, the MC7824BT offers tighter output tolerance and higher ripple rejection for industrial control applications, while avoiding automotive cost premiums unless AEC-Q100 compliance is required.
Availability
MC7824BT is available at Aetrix Electronics and suitable for industrial PLC power, motor driver logic supplies, and embedded auxiliary rails requiring stable component supply with long-term lifecycle support.
Supply support for MC7824BT 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 supplier specializing in energy-efficient power management, analog, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
The MC7800 series-including MC7824BT-is designed for robust local regulation in cost-sensitive industrial and embedded systems, emphasizing reliability, integrated protection, and ease of implementation without external compensation.
FAQ
What is the minimum input voltage required for MC7824BT to maintain regulation at full 1.0 A load?
The MC7824BT requires a minimum input voltage of 27.3 V DC to sustain 24 V output at 1.0 A load, based on its 2.0 V dropout specification and worst-case output tolerance (23.2 V). Input below this threshold causes output collapse or unregulated behavior. Always include 0.5–1.0 V margin for ripple and line drop.
Does MC7824BT require an output capacitor for stability?
No, the MC7824BT is internally compensated and does not require an output capacitor for stability. However, adding ≥0.1 µF ceramic or tantalum capacitor at the output significantly improves transient response to load steps-especially critical in digital I/O or motor driver applications where fast current surges occur.
Can MC7824BT be used in parallel to increase output current?
No, the MC7824BT is not designed for parallel operation. Its output voltage tolerance (±3.5%) and lack of current-sharing features mean paralleling units will cause unequal current distribution and potential thermal runaway. For >1.0 A, use a single higher-current regulator or external pass transistor configured per Figure 11 in the datasheet.
What thermal management is required for MC7824BT at 1.0 A output with 33 V input?
At 33 V input and 24 V/1.0 A output, power dissipation is (33 − 24) × 1.0 = 9 W. With RθJA = 92 °C/W, junction rise would exceed 828°C-impossible without heatsinking. A heatsink with RθSA ≤ 5.0 °C/W (plus thermal interface) is mandatory to keep TJ ≤ 150°C. Use RθJC = 5.0 °C/W to size mounting interface.
Is MC7824BT compatible with lead-free PCB assembly processes?
Yes, MC7824BT is Pb-free and RoHS-compliant, qualified for standard lead-free reflow profiles (JEDEC J-STD-020). Its TO-220 package withstands peak temperatures up to 260°C for 20–40 seconds. No special soldering precautions beyond standard lead-free guidelines are required.
MC7824BT 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):
- 8 mA
- Current - Supply (Max):
- -
- PSRR:
- 61dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
MC7824BT FAQ
1.How can I place an order for MC7824BT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7824BT 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 MC7824BT reliable?
The price and inventory of MC7824BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7824BT is usually 5 days.
3.What payment methods are accepted for MC7824BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7824BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7824BT?
MC7824BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7824BT 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 MC7824BT?
For technical support, including MC7824BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7824BT requirements.
6.How does Aetrix verify that MC7824BT is sourced from the original manufacturer or authorized distributors?
All MC7824BT 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 MC7824BT meets industry standards.
7.What is the process for return or replacement of MC7824BT?
All MC7824BT units undergo pre-shipment inspection (PSI). If there is an issue with MC7824BT, 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 MC7824BT part is unused and in its original packaging.
Return procedure for MC7824BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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