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onsemi MC7924CT
- Part No.:
- MC7924CT
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7924CT.pdf
- Description:
- IC REG LINEAR -24V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,969
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Product details
Overview
MC7924CT 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 under load currents from 5 mA to 1.0 A with ≤240 mV load regulation.
For engineers reviewing the MC7924CT datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (−27 V to −38 V), dropout voltage (1.3 V at 1.0 A), ripple rejection (56 dB at 120 Hz), output noise (170 µV RMS), and TO-220 package thermal performance (θJA = 65 °C/W).
Technical Context
The MC7924CT implements a monolithic bipolar linear regulator architecture with an integrated pass transistor, error amplifier, reference, and protection circuitry. Its safe-area compensation dynamically reduces short-circuit current as VIN−VOUT increases, preventing second breakdown during fault conditions.
Thermal shutdown activates at +150 °C junction temperature, and internal current limiting holds peak output current below 1.8 A under sustained overload. The device operates across 0 °C to +125 °C junction temperature with ±1.0 mV/°C average temperature coefficient of output voltage.
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 systems requiring tight rail tolerance. |
| Output Current | 1.0 A continuous - supports medium-power analog circuits, op-amp dual supplies, and industrial control modules without external boosting. |
| Input Voltage Range | −27 V to −38 V - mandates ≥3 V headroom above output for stable regulation, limiting usable input ripple amplitude in unregulated DC sources. |
| Dropout Voltage | 1.3 V at 1.0 A and +25 °C - defines minimum input-to-output differential needed to maintain regulation; impacts heatsink sizing in high-dissipation applications. |
| Ripple Rejection | 56 dB at 120 Hz - attenuates line-frequency ripple by >600×, critical for low-noise analog signal chains powered from rectified AC. |
| Output Noise | 170 µV RMS (10 Hz–100 kHz) - sets baseline noise floor for precision instrumentation and audio preamplifier bias rails. |
| Thermal Resistance | θJA = 65 °C/W (TO-220, no heatsink) - determines maximum ambient temperature for 15 W dissipation before thermal shutdown triggers. |
Pinout & Package
MC7924CT is housed in a TO-220 package (Case 221AB) with heatsink surface electrically connected to Pin 2. The case is designed for vertical mounting with screw-hole attachment and requires thermal interface material for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Ground | Reference node for both input and output; must be low-impedance common return path to avoid regulation error and instability. |
| Pin 2 | Input | Negative input terminal; connects to unregulated negative supply rail; must be bypassed with ≥0.33 µF capacitor if located >5 cm from filter capacitor. |
| Pin 3 | Output | Regulated −24 V output; requires ≥1.0 µF output capacitor for transient stability and ESR < 0.7 Ω for high-frequency noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables compact, low-BOM-cost power solutions - only input/output capacitors needed for standard operation per Figure 12 application circuit. |
| Internal thermal overload protection | Auto-shutdown at +150 °C junction temperature prevents permanent damage during sustained overloads or inadequate heatsinking. |
| Internal short-circuit current limiting | Limits peak output current to ~1.8 A, protecting both regulator and downstream circuitry during output faults without external fusing. |
| Safe-area compensated output transistor | Dynamically scales current limit vs. VCE, eliminating need for external foldback circuitry and enabling robust operation across wide input-output differentials. |
| Pb-free lead finish (G-suffix) | Complies with RoHS Directive 2011/65/EU; compatible with standard SnPb and lead-free reflow profiles per onsemi Soldering Manual SOLDERRM/D. |
Applications
| Industrial Power Supplies | Operational Amplifier Dual Rails |
|---|---|
|
Use Scenario: Providing stable −24 V bias for PLC I/O modules, sensor transmitters, and motor drive control logic. IC Role / Device Role / Timing Role: Primary negative rail regulator in isolated DC-DC derived supplies, referenced to system ground. Use Value: Maintains regulation under 1.0 A load steps and 200 mV line ripple, ensuring consistent ADC reference and digital logic thresholds. |
Use Scenario: Generating matched ±24 V rails for high-voltage op-amps used in precision test equipment and active filters. IC Role / Device Role / Timing Role: Negative complement to MC7824CT in symmetrical dual-supply configurations. Use Value: Delivers identical load/line regulation specs as positive counterpart, minimizing offset drift and common-mode error in differential stages. |
| Test & Measurement Equipment | Legacy Telecom Systems |
|
Use Scenario: Biasing RF mixer LO buffers and analog front-end gain blocks requiring ultra-low noise −24 V supply. IC Role / Device Role / Timing Role: Low-noise local regulator decoupled from noisy system rails using 1 µF tantalum output cap. Use Value: 170 µV RMS noise and 56 dB ripple rejection suppress switching artifacts from adjacent SMPS sections. |
Use Scenario: Replacing obsolete −24 V regulators in legacy PBX line cards and channel bank analog interfaces. IC Role / Device Role / Timing Role: Direct drop-in replacement for MC7924C in existing TO-220 footprints with identical pinout and thermal profile. Use Value: Same 2% output tolerance, thermal shutdown threshold, and safe-area compensation ensure field-replaceable reliability without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7924CT | ±2% output tolerance (vs. MC7924CT's ±2.5% typical), higher quiescent current (6.5 mA vs. 4.6 mA), lower ripple rejection (50 dB @ 120 Hz). | Preferred where tighter initial accuracy is prioritized over efficiency and noise performance. | Select LM7924CT only when traceability to National Semiconductor legacy designs is required; otherwise MC7924CT offers superior noise and thermal robustness. |
| MC7924CD2TR4G | D2PAK package (Case 936), same electrical specs, θJA = 70 °C/W, surface-mount compatible, heatsink terminal on Pin 2. | Suitable for automated assembly and space-constrained PCBs where through-hole TO-220 is impractical. | Choose MC7924CD2TR4G for new SMT designs; MC7924CT remains optimal for manual assembly, prototyping, and thermal testing with screw-mounted heatsinks. |
Compared with LM7924CT and MC7924CD2TR4G, the MC7924CT delivers best-in-class noise (170 µV vs. 220 µV) and ripple rejection (56 dB vs. 50 dB) in a proven through-hole package ideal for industrial serviceability and thermal validation.
Availability
MC7924CT is available at Aetrix Electronics and suitable for industrial power supplies, operational amplifier dual-rail generation, and test equipment requiring stable component supply with long lifecycle support and RoHS-compliant sourcing.
Supply support for MC7924CT 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, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC7900 Series, including MC7924CT, was engineered as a rugged, drop-in negative complement to the MC7800 family for dual-rail analog systems, industrial controls, and legacy telecom equipment requiring reliable linear regulation.
FAQ
What is the maximum input voltage rating for MC7924CT?
The MC7924CT has a maximum input voltage rating of −40 V DC, as specified in the Absolute Maximum Ratings table. Operation beyond this limit risks permanent damage. For reliable long-term use, the recommended maximum input is −38 V DC under all operating conditions, maintaining at least 14 V differential headroom above the −24 V output.
Does MC7924CT require input and output capacitors for stable operation?
Yes, MC7924CT requires both input and output capacitors. A minimum 0.33 µF input capacitor (tantalum or low-ESR film) is mandatory if the regulator is located more than 5 cm from the main filter capacitor. A 1.0 µF output capacitor with ESR < 0.7 Ω is required for transient stability and noise suppression, per the Standard Application schematic on page 1 of the datasheet.
What is the thermal resistance and power dissipation capability of MC7924CT in TO-220 package?
In the TO-220 package (Case 221AB), MC7924CT has θJA = 65 °C/W (no heatsink) and θJC = 5.0 °C/W. With adequate heatsinking, it can dissipate up to 15 W continuously. At 1.0 A output and 10 V input-output differential, power dissipation is 10 W - requiring a heatsink with θSA ≤ 5.0 °C/W to maintain TJ < +125 °C at +50 °C ambient.
How does MC7924CT handle short-circuit conditions?
MC7924CT employs internal short-circuit current limiting that holds peak output current to approximately 1.8 A, independent of input voltage. Combined with safe-area compensation, this limits power dissipation in the pass transistor during output faults, preventing second breakdown. Thermal shutdown engages if junction temperature exceeds +150 °C, providing redundant protection.
Is MC7924CT pin-compatible with other MC7900 series regulators?
Yes, all MC7900 series regulators-including MC7924CT-share identical TO-220 pinout (Pin 1: Ground, Pin 2: Input, Pin 3: Output) and mechanical footprint. This allows direct substitution across the family (e.g., MC7912CT, MC7915CT) in existing designs, provided input voltage, output current, and thermal requirements are verified for the specific variant.
MC7924CT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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
MC7924CT FAQ
1.How can I place an order for MC7924CT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7924CT 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 MC7924CT reliable?
The price and inventory of MC7924CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7924CT is usually 5 days.
3.What payment methods are accepted for MC7924CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7924CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7924CT?
MC7924CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7924CT 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 MC7924CT?
For technical support, including MC7924CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7924CT requirements.
6.How does Aetrix verify that MC7924CT is sourced from the original manufacturer or authorized distributors?
All MC7924CT 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 MC7924CT meets industry standards.
7.What is the process for return or replacement of MC7924CT?
All MC7924CT units undergo pre-shipment inspection (PSI). If there is an issue with MC7924CT, 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 MC7924CT part is unused and in its original packaging.
Return procedure for MC7924CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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