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onsemi MC79L24ACPRMG
- Part No.:
- MC79L24ACPRMG
- Manufacturer:
- onsemi
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
MC79L24ACPRMG.pdf
- Description:
- IC REG LINEAR -24V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
MC79L24ACPRMG from onsemi is a three-terminal, fixed-output, negative-voltage linear regulator delivering −24 V at up to 100 mA. It features internal short-circuit current limiting, thermal overload protection, and requires no external components for basic operation. It is used in low-power analog circuitry, sensor biasing, and dual-rail op-amp supplies where stable negative rail generation is required.
For engineers reviewing the MC79L24ACPRMG datasheet, pinout, applications, or equivalent options, key selection considerations include dropout voltage (1.7 V at 40 mA), input voltage range (−27 V to −38 V), output voltage tolerance (±4.2% at +25 °C), and TO-92 package thermal performance (RJA = 160 °C/W).
Technical Context
The MC79L24ACPRMG implements a monolithic bipolar linear regulator architecture with built-in foldback current limiting and thermal shutdown. Its design targets cost-sensitive, low-current applications where simplicity and reliability outweigh high-efficiency requirements.
It operates across an ambient temperature range of 0 °C to +125 °C and maintains regulation under load currents from 1.0 mA to 100 mA. Input-to-output differential must remain ≥1.7 V to sustain regulation, and ripple rejection is 31–47 dB at 120 Hz depending on input voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −24 V nominal; −23 V to −25 V over temperature and load (±4.2% tolerance) |
| Max Output Current | 100 mA continuous; internal current limiting prevents damage during overload |
| Dropout Voltage | 1.7 V at 40 mA and +25 °C; minimum headroom needed between input and output |
| Input Voltage Range | −27 V to −38 V DC; supports standard −24 V supply rails with margin for ripple |
| Ripple Rejection | 31 dB min at 120 Hz (−29 V to −35 V input); suppresses AC noise on input supply |
| Thermal Resistance | 160 °C/W junction-to-ambient (TO-92 package); limits power dissipation to ~390 mW at +25 °C ambient |
| Operating Temperature | 0 °C to +125 °C junction; suitable for commercial and industrial environments |
Pinout & Package
MC79L24ACPRMG is housed in a Pb-free TO-92 (Case 29-10) package with bent leads. The package is rated for 1 W maximum power dissipation and features through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Reference node for output voltage; connects to system common ground plane |
| 2 | Input | Negative input terminal; accepts unregulated −27 V to −38 V supply |
| 3 | Output | Regulated −24 V output; supplies downstream analog or logic circuitry |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables minimal BOM count and PCB footprint in space-constrained designs |
| Internal short-circuit current limiting | Prevents destructive current flow during output faults without external sensing |
| Internal thermal overload protection | Shuts down regulator when junction temperature exceeds +150 °C, enabling safe recovery |
| Pb-free TO-92 packaging | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
| Low output noise | 200 µV RMS (10 Hz–100 kHz); suitable for noise-sensitive analog signal chains |
Applications
| Industrial Sensor Signal Conditioning | Audio Pre-amplifier Power Supply |
|---|---|
Use Scenario: Providing clean, stable negative bias for precision instrumentation amplifiers in factory-floor pressure/temperature transmitters. IC Role / Device Role / Timing Role: Negative voltage regulator supplying −24 V rail to op-amps and ADC front-ends. Use Value: Maintains ±0.1% gain stability over temperature by rejecting input ripple and minimizing thermal drift of output voltage. |
Use Scenario: Dual-rail power for discrete transistor-based microphone preamplifiers in broadcast audio interfaces. IC Role / Device Role / Timing Role: Fixed −24 V source for NPN/PNP complementary gain stages requiring symmetrical supply rails. Use Value: Delivers low-noise output (200 µV RMS) that preserves signal-to-noise ratio in high-gain analog paths. |
| Legacy Industrial Control I/O Modules | Test & Measurement Equipment Bias Rails |
Use Scenario: On-card regulation for −24 V logic-level translation and optocoupler LED drivers in PLC backplane modules. IC Role / Device Role / Timing Role: Local negative regulator replacing centralized −24 V distribution to reduce ground loop errors. Use Value: Eliminates need for external capacitors in most configurations, reducing component count and board area. |
Use Scenario: Bias supply for calibrated reference buffers and DAC output stages in benchtop multimeters and waveform analyzers. IC Role / Device Role / Timing Role: Precision −24 V source with tight initial tolerance (±4.2%) and low load regulation (100 mV max). Use Value: Ensures measurement accuracy by minimizing output voltage shift across varying load conditions (1–100 mA). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative-voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC79L24ACPGB | Same electrical specs; TO-92 package in bulk bag (2000 units), not tape-and-ammo box | Identical use case but optimized for manual prototyping or low-volume assembly | Select MC79L24ACPGB for lab evaluation or small-batch builds where reel handling is unnecessary |
| LM7924CT | Higher current rating (1.5 A), larger TO-220 package, higher dropout (2.0 V), different thermal resistance (RJA = 50 °C/W) | Suitable for higher-power systems requiring >100 mA; incompatible pinout and layout | Choose LM7924CT only when load current exceeds 100 mA and board space allows TO-220 footprint |
Compared with MC79L24ACPGB, MC79L24ACPRMG offers identical regulation performance with automated SMT-compatible packaging; compared with LM7924CT, it trades current capacity and thermal headroom for compact size and lower system cost in sub-100 mA applications.
Availability
MC79L24ACPRMG is available at Aetrix Electronics and suitable for industrial sensor conditioning, audio preamplifier power supplies, and legacy control I/O modules requiring stable component supply and long-term manufacturability.
Supply support for MC79L24ACPRMG 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 supplier focused on energy-efficient electronics, with leadership in power management, analog, and sensor technologies.
The MC79L00A Series was designed specifically for cost-effective, low-current negative voltage regulation in commercial and industrial equipment where reliability, simplicity, and thermal robustness are prioritized over high efficiency or ultra-low quiescent current.
FAQ
What is the maximum input voltage for MC79L24ACPRMG?
The absolute maximum input voltage for MC79L24ACPRMG is −40 V DC. Operation above −38 V is not recommended, as the device is specified for reliable regulation only within −27 V to −38 V. Exceeding −40 V risks permanent damage due to junction breakdown, even with thermal protection active.
Does MC79L24ACPRMG require input and output capacitors?
MC79L24ACPRMG does not require external capacitors for basic regulation, per its datasheet. However, a 0.33 µF input bypass capacitor is recommended when the regulator is located >2 inches from the power supply filter, and a 0.1 µF output capacitor improves transient response. Both improve stability under dynamic loads.
What is the output voltage tolerance of MC79L24ACPRMG over temperature?
MC79L24ACPRMG guarantees −22.8 V to −25.2 V output across its full operating temperature range (0 °C to +125 °C) and load range (1.0 mA to 40 mA), corresponding to ±4.2% tolerance at nominal −24 V. This is tighter than the wider ±5% spec covering 1.0–100 mA at +25 °C only.
Can MC79L24ACPRMG be used in automotive applications?
No - MC79L24ACPRMG is rated for 0 °C to +125 °C junction temperature and is designated for commercial/industrial use. Automotive-grade variants (e.g., MC79L24ABxxx) exist with −40 °C to +125 °C operation and additional AEC-Q100 stress testing, but MC79L24ACPRMG lacks those qualifications.
How does thermal shutdown work in MC79L24ACPRMG?
MC79L24ACPRMG incorporates a thermal shutdown circuit that disables the output when the silicon junction temperature reaches +150 °C. Once the die cools by ~15 °C, regulation automatically resumes. This protects against sustained overload or inadequate heatsinking without requiring external intervention.
MC79L24ACPRMG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- 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):
- 1.7V @ 40mA (Typ)
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 47dB (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-92 (TO-226)
MC79L24ACPRMG FAQ
1.How can I place an order for MC79L24ACPRMG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC79L24ACPRMG 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 MC79L24ACPRMG reliable?
The price and inventory of MC79L24ACPRMG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC79L24ACPRMG is usually 5 days.
3.What payment methods are accepted for MC79L24ACPRMG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC79L24ACPRMG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC79L24ACPRMG?
MC79L24ACPRMG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC79L24ACPRMG 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 MC79L24ACPRMG?
For technical support, including MC79L24ACPRMG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC79L24ACPRMG requirements.
6.How does Aetrix verify that MC79L24ACPRMG is sourced from the original manufacturer or authorized distributors?
All MC79L24ACPRMG 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 MC79L24ACPRMG meets industry standards.
7.What is the process for return or replacement of MC79L24ACPRMG?
All MC79L24ACPRMG units undergo pre-shipment inspection (PSI). If there is an issue with MC79L24ACPRMG, 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 MC79L24ACPRMG part is unused and in its original packaging.
Return procedure for MC79L24ACPRMG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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