My Inquiry
My Account
onsemi MC7924CD2TG
- Part No.:
- MC7924CD2TG
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7924CD2TG.pdf
- Description:
- IC REG LINEAR -24V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:146
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC7924CD2TG 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 ≤2% output voltage tolerance.
For engineers reviewing the MC7924CD2TG datasheet, pinout, applications, or equivalent options, key selection considerations 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 D2PAK package thermal performance (θJA = 70 °C/W).
Technical Context
The MC7924CD2TG 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.
It operates across an input differential of 3.0 V to 15 V (e.g., −33 V input → −24 V output), supports junction temperatures from 0°C to +125°C, and delivers specified performance with input bypass capacitance ≥0.33 µF and output capacitance ≥1.0 µF - critical for stability in dual-rail op-amp supplies and MECL logic systems.
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 - sufficient for powering operational amplifiers, analog front-ends, and legacy industrial controllers. |
| Input Voltage Range | −27 V to −38 V - accommodates unregulated transformer-rectifier inputs with ±10% line variation and ripple. |
| Dropout Voltage | 1.3 V at 1.0 A and +25°C - defines minimum headroom needed between input and regulated output. |
| Ripple Rejection | 56 dB at 120 Hz - suppresses AC line ripple in linear power supply designs without additional filtering stages. |
| Output Noise | 170 µV RMS (10 Hz–100 kHz) - low enough for precision analog signal chains requiring clean negative bias. |
| Thermal Resistance | θJA = 70 °C/W (D2PAK, PCB-mounted) - determines heatsink requirement for 15 W max dissipation at +50°C ambient. |
Pinout & Package
D2PAK (TO-263) package with exposed thermal pad connected to Pin 2 (Input). Heatsink surface must be electrically tied to input potential. Standard 3-pin configuration optimized for high-current PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Ground | Reference node for output voltage; connects to system common ground plane - no sensing or feedback function. |
| Pin 2 | Input | Negative input supply terminal; also serves as thermal pad connection - must be soldered to large copper area for thermal management. |
| Pin 3 | Output | Regulated −24 V output; drives load directly - requires ≥1.0 µF output capacitor for transient stability per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables compact, low-BOM-cost power solutions - only input/output capacitors needed for stability. |
| Internal thermal overload protection | Shuts down regulator at +150°C junction temperature - prevents permanent damage during sustained overload or poor heatsinking. |
| Internal short-circuit current limiting | Limits peak output current to ~1.8 A - protects both IC and upstream supply during output faults. |
| Safe-area compensated pass transistor | Prevents secondary breakdown by reducing short-circuit current as VCE rises - critical for reliability in variable-load applications. |
| Pb-free D2PAK package | RoHS-compliant construction with G-suffix marking - meets environmental compliance requirements for industrial and telecom equipment. |
Applications
| Industrial Dual-Rail Op-Amp Supply | Legacy MECL Logic Power |
|---|---|
|
Use Scenario: Providing symmetric ±15 V or ±12 V rails for precision instrumentation amplifiers and ADC drivers. IC Role / Device Role / Timing Role: Negative rail regulator in split-supply configuration, paired with MC7815/MC7812. Use Value: Delivers low-noise −24 V for biasing op-amp input stages, enabling >100 dB PSRR and minimal offset drift. |
Use Scenario: Powering ECL/MECL digital logic families requiring tightly regulated negative supply voltages. IC Role / Device Role / Timing Role: Primary −24 V source for gate arrays and high-speed comparators in telecom timing circuits. Use Value: Maintains <±2.5% output accuracy across temperature and load, ensuring consistent logic threshold margins and propagation delay. |
| Programmable Logic Controller (PLC) Analog I/O | Test Equipment Bias Supply |
|
Use Scenario: Generating isolated −24 V for analog input conditioning circuits in modular PLC backplanes. IC Role / Device Role / Timing Role: Local regulation stage downstream of DC-DC converter, decoupling analog section from digital noise. Use Value: Ripple rejection of 56 dB eliminates 120 Hz hum in 4–20 mA loop receivers, improving measurement resolution by ≥12 bits. |
Use Scenario: Supplying calibrated negative bias to DUT interfaces in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Precision voltage source for DAC reference buffers and sensor excitation circuits. Use Value: 2% initial tolerance and −1.0 mV/°C tempco enable traceable calibration without post-manufacture trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7924CT | Same −24 V output, TO-220 package, 4% tolerance, higher θJA (65 °C/W), no Pb-free option standard. | Lower cost for non-RoHS projects; requires larger heatsink due to higher thermal resistance. | Select when board space allows TO-220 mounting and RoHS compliance is not required. |
| MC7924BD2TG | Same D2PAK package and −24 V output, but −40°C to +125°C extended temperature grade and 4% tolerance. | Suitable for automotive or outdoor industrial environments where cold-start operation below 0°C is mandatory. | Select when operation below 0°C is required and tighter 2% tolerance is not critical. |
Compared with LM7924CT and MC7924BD2TG, the MC7924CD2TG offers superior output accuracy (2% vs. 4%), Pb-free compliance, and optimized thermal performance for high-density PCB layouts - making it preferred for modern industrial control and test equipment where precision and regulatory compliance are prioritized.
Availability
MC7924CD2TG is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy logic power applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC7924CD2TG 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 sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC7900 series - including MC7924CD2TG - was designed as a robust, drop-in complement to the MC7800 positive regulators, targeting high-reliability linear power supplies in harsh industrial and telecom environments.
FAQ
What is the maximum input voltage for MC7924CD2TG?
The MC7924CD2TG supports a maximum input voltage of −40 V DC under rated conditions. This rating applies when the output is loaded and ambient temperature is maintained within specifications. Exceeding −40 V risks permanent damage due to junction breakdown, even with thermal protection active. Always ensure input ripple remains within the −27 V to −38 V operating window for reliable regulation.
Does MC7924CD2TG require input and output capacitors?
Yes, the MC7924CD2TG requires both input and output capacitors for stable operation. A minimum 0.33 µF input capacitor (tantalum or low-ESR ceramic) is recommended when traces exceed 2 inches, and a 1.0 µF output capacitor is mandatory to prevent oscillation and ensure transient response. The datasheet specifies these values for all operating conditions - omitting them risks instability or regulator failure.
Can MC7924CD2TG be used in parallel for higher current?
No, the MC7924CD2TG 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 premature failure. For >1.0 A loads, use a single higher-current regulator or implement an external pass transistor boost circuit as shown in Figure 9 of the datasheet.
What is the thermal resistance of MC7924CD2TG in typical PCB layout?
The MC7924CD2TG has a junction-to-ambient thermal resistance (θJA) of 70 °C/W when mounted on a standard FR-4 PCB with 1 in² of 2 oz. copper connected to Pin 2 (input/thermal pad). Performance improves to ~35 °C/W with a dedicated heatsink. This value assumes free-air convection - forced airflow or copper fill optimization can further reduce thermal impedance.
Is MC7924CD2TG compatible with MC7824CT for dual-rail designs?
Yes, the MC7924CD2TG is functionally complementary to the MC7824CT positive regulator, enabling symmetric ±24 V dual-rail supplies. Both share identical thermal protection, current limiting, and package footprints (D2PAK for MC7924CD2TG, TO-220 for MC7824CT). However, direct pin-for-pin pairing requires mechanical adaptation - consider MC7824CD2TG for matched D2PAK layout.
MC7924CD2TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- 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:
- Surface Mount
- Supplier Device Package:
- D2PAK-3
MC7924CD2TG FAQ
1.How can I place an order for MC7924CD2TG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7924CD2TG 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 MC7924CD2TG reliable?
The price and inventory of MC7924CD2TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7924CD2TG is usually 5 days.
3.What payment methods are accepted for MC7924CD2TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7924CD2TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7924CD2TG?
MC7924CD2TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7924CD2TG 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 MC7924CD2TG?
For technical support, including MC7924CD2TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7924CD2TG requirements.
6.How does Aetrix verify that MC7924CD2TG is sourced from the original manufacturer or authorized distributors?
All MC7924CD2TG 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 MC7924CD2TG meets industry standards.
7.What is the process for return or replacement of MC7924CD2TG?
All MC7924CD2TG units undergo pre-shipment inspection (PSI). If there is an issue with MC7924CD2TG, 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 MC7924CD2TG part is unused and in its original packaging.
Return procedure for MC7924CD2TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC7924CD2TG Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
