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onsemi MC7924CTG
- Part No.:
- MC7924CTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7924CTG.pdf
- Description:
- IC REG LINEAR -24V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,238
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Product details
Overview
MC7924CTG from onsemi is a fixed-output negative voltage regulator delivering −24 V at up to 1.0 A, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation for rugged operation in industrial power supplies. It requires no external components for basic regulation and maintains stable output across input voltages from −27 V to −38 V with ≤25.2 V deviation under full load.
For engineers reviewing the MC7924CTG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (1.3 V at 1.0 A), ripple rejection (56 dB at 120 Hz), output noise (170 µV RMS), thermal resistance (5.0 °C/W junction-to-case), and TO-220 package compatibility with standard heatsinking.
Technical Context
The MC7924CTG implements a monolithic bipolar pass transistor architecture with integrated protection circuitry. Its safe-area compensation dynamically reduces short-circuit current as the pass transistor's VCE increases, preventing second breakdown during fault conditions.
Thermal overload protection activates at +150 °C junction temperature, and internal current limiting holds peak output current below 1.0 A under sustained overload. The device operates over 0 °C to +125 °C junction temperature range with 2% output voltage tolerance at +25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −24 V nominal; −22.8 V to −25.2 V over full operating range ensures compatibility with −24 V logic and analog rails |
| Output Current | 1.0 A continuous; internally limited to prevent damage during sustained overload or short circuit |
| Dropout Voltage | 1.3 V at 1.0 A; defines minimum input-to-output differential required for regulation |
| Ripple Rejection | 56 dB at 120 Hz; suppresses AC line ripple entering from unregulated DC sources |
| Output Noise | 170 µV RMS (10 Hz–100 kHz); low enough for precision analog subsystems without additional filtering |
| Thermal Resistance | 5.0 °C/W junction-to-case; enables ≥15 W power dissipation with adequate heatsink |
| Line Regulation | 240 mV max over −27 V to −38 V input; critical for stability when input varies due to transformer or rectifier ripple |
Pinout & Package
MC7924CTG uses the TO-220 package (Case 221AB) with heatsink surface electrically connected to Pin 2. Pin 1 is Ground, Pin 2 is Input (VI), and Pin 3 is Output (VO). Mounting the tab to chassis ground provides both thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Ground | Reference node for internal biasing and feedback; must be low-impedance connection to system ground plane |
| Pin 2 | Input | Negative input terminal; connects to unregulated negative supply rail; heatsink tab is electrically tied to this pin |
| Pin 3 | Output | Regulated −24 V output; feeds downstream loads; bypass capacitor (≥1.0 µF) recommended directly at this pin |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables compact, low-BOM-cost power design with only input/output capacitors needed for stability |
| Internal thermal shutdown | Automatically disables output above +150 °C junction temperature, preventing permanent damage during overheating |
| Safe-area compensated pass transistor | Prevents secondary breakdown by reducing short-circuit current as VCE rises-critical for reliability in transient faults |
| Pb-free lead finish (G-suffix) | Complies with RoHS Directive 2011/65/EU; compatible with lead-free reflow soldering profiles |
| 2% output voltage tolerance | Ensures tight regulation for −24 V systems requiring precise biasing of op-amps, ADCs, or RF stages |
Applications
| Industrial Power Supplies | Operational Amplifier Dual Rails |
|---|---|
Use Scenario: Providing regulated −24 V for PLC I/O modules, motor drive control logic, and sensor signal conditioning circuits in factory automation. IC Role / Device Role / Timing Role: Primary negative rail regulator supplying stable bias to isolated gate drivers and analog front-ends. Use Value: Internal short-circuit protection and thermal shutdown ensure uninterrupted operation in harsh environments with variable input ripple and ambient temperature swings. | Use Scenario: Paired with MC7824CTG to generate symmetric ±24 V rails for high-voltage operational amplifiers in test equipment and audio power stages. IC Role / Device Role / Timing Role: Negative complement to positive regulator in dual-supply configuration; shares common ground reference. Use Value: Matched line/load regulation and low output noise (<170 µV RMS) preserve signal integrity and minimize offset drift in precision amplifier circuits. |
| Telecom Line Card Bias | Legacy MECL System Power |
Use Scenario: Delivering −24 V bias to line interface circuits (LICs), SLICs, and ringing generators in telecom central office equipment. IC Role / Device Role / Timing Role: Regulated negative supply for analog voice path components requiring low-noise, high-reliability DC power. Use Value: Ripple rejection of 56 dB at 120 Hz suppresses power supply hum that would otherwise modulate voice signals. | Use Scenario: Supplying −24 V to emitter-coupled logic (ECL) families such as 10K/100K series where precise negative rail stability determines switching speed and noise margin. IC Role / Device Role / Timing Role: Fixed negative voltage source meeting ECL system requirements for VEE rail accuracy and transient response. Use Value: 2% output tolerance and <1.3 V dropout enable reliable operation even with aging or loosely regulated input supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM337T | Adjustable output (−1.25 V to −37 V); requires two external resistors; higher quiescent current (5 mA vs. 4.6 mA typical) | Used where programmable or non-standard negative voltages are needed; less suitable for fixed −24 V due to resistor tolerance sensitivity | Select LM337T only if output voltage adjustment is required; MC7924CTG offers tighter tolerance and simpler layout for fixed −24 V |
| MC7924BTG | Same −24 V output but rated for −40 °C to +125 °C operating range; 4% output tolerance vs. 2% for MC7924CTG | Preferred for extended-temperature industrial or automotive under-hood applications where wide temp range outweighs tighter tolerance needs | Choose MC7924BTG for extreme ambient conditions; MC7924CTG preferred for commercial-grade precision −24 V systems |
Compared with LM337T and MC7924BTG, the MC7924CTG delivers superior output accuracy (2% vs. adjustable or 4%), lower component count, and optimized thermal performance for fixed −24 V use cases-making it ideal for cost-sensitive, high-volume industrial power designs.
Availability
MC7924CTG is available at Aetrix Electronics and suitable for industrial power supplies, operational amplifier dual-rail systems, telecom line card biasing, and legacy MECL system power requiring stable component supply and long-term manufacturability.
Supply support for MC7924CTG 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 manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC7900 Series-including MC7924CTG-is designed specifically for robust, fixed-output negative voltage regulation in industrial control, instrumentation, and legacy logic systems where reliability, thermal resilience, and minimal external components are essential.
FAQ
What is the maximum input voltage rating for MC7924CTG?
The MC7924CTG supports a maximum input voltage of −40 V DC under all operating conditions. This rating applies across its full junction temperature range (0 °C to +125 °C) and ensures safe operation when used with transformer-rectified supplies exhibiting significant ripple or transient overshoot. Exceeding −40 V risks permanent damage to the internal pass transistor and protection circuitry.
Does MC7924CTG require input and output capacitors for stable operation?
Yes, MC7924CTG requires an input bypass capacitor (≥0.33 µF tantalum or low-ESR ceramic) and an output capacitor (≥1.0 µF) for stable regulation. These capacitors suppress high-frequency noise, improve transient response, and prevent oscillation-especially when the regulator is located more than a few centimeters from the main filter capacitor. The datasheet specifies 0.33 µF input and 1.0 µF output as minimum values.
Can MC7924CTG be used in parallel to increase output current?
No, MC7924CTG is not designed for parallel operation. Its output voltage tolerance (±2%) and lack of current-sharing features mean paralleling units will cause unequal current distribution, thermal runaway, and potential failure. For higher current, use a single higher-rated regulator or implement an external pass transistor boost configuration as shown in Figure 9 of the MC7900 Series datasheet.
What is the thermal resistance and maximum power dissipation of MC7924CTG?
MC7924CTG has a junction-to-case thermal resistance (θJC) of 5.0 °C/W and a junction-to-ambient resistance (θJA) of 65 °C/W in free air. With adequate heatsinking, it can dissipate up to 15 W continuously. At 1.0 A output and 1.3 V dropout, power dissipation is 1.3 W-well within limits-but total dissipation must stay below 15 W to avoid thermal shutdown.
Is MC7924CTG RoHS-compliant and lead-free?
Yes, MC7924CTG is RoHS-compliant and features a Pb-free lead finish, indicated by the "G" suffix in the part number. It meets EU Directive 2011/65/EU and is compatible with standard lead-free reflow soldering processes. The device marking includes "G" to confirm compliance, and packaging documentation confirms Pb-free status per onsemi's environmental policy.
MC7924CTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -40V
- Voltage - Output (Min/Fixed):
- -24V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 56dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
MC7924CTG FAQ
1.How can I place an order for MC7924CTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7924CTG 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 MC7924CTG reliable?
The price and inventory of MC7924CTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7924CTG is usually 5 days.
3.What payment methods are accepted for MC7924CTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7924CTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7924CTG?
MC7924CTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7924CTG 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 MC7924CTG?
For technical support, including MC7924CTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7924CTG requirements.
6.How does Aetrix verify that MC7924CTG is sourced from the original manufacturer or authorized distributors?
All MC7924CTG 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 MC7924CTG meets industry standards.
7.What is the process for return or replacement of MC7924CTG?
All MC7924CTG units undergo pre-shipment inspection (PSI). If there is an issue with MC7924CTG, 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 MC7924CTG part is unused and in its original packaging.
Return procedure for MC7924CTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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