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onsemi MC79M05CDT
- Part No.:
- MC79M05CDT
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC79M05CDT.pdf
- Description:
- IC REG LINEAR -5V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,179
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Product details
Overview
MC79M05CDT from onsemi is a fixed-output negative voltage regulator delivering −5.0 V at up to 500 mA, featuring internal thermal overload protection, short-circuit current limiting, and safe-area compensation in a DPAK-3 surface-mount package. It operates across 0 °C to +125 °C and requires no external components for basic regulation, commonly used in industrial power supplies and analog circuit biasing.
For engineers reviewing the MC79M05CDT datasheet, pinout, applications, or equivalent options, key selection considerations include its −5.0 V output tolerance (±4.0%), dropout voltage of 1.1 V at 500 mA, ripple rejection of 54–66 dB at 120 Hz, and thermal resistance (θJA = 92 °C/W) in the DPAK-3 package.
Technical Context
The MC79M05CDT implements a monolithic bipolar linear regulator architecture with integrated pass transistor, error amplifier, reference, and protection circuitry. Its design ensures stable operation under load transients and input ripple without external compensation.
It functions as a three-terminal negative voltage source where input (VI) must be ≥1.1 V more negative than output (VO) under full load, and shares common ground between input and output. The device is optimized for fixed-voltage applications requiring ruggedness over wide temperature and line/load variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −5.0 V ±4.0% (−4.8 V to −5.2 V at TJ = 25 °C), enabling precise biasing of op-amps and sensors in negative-rail systems |
| Maximum Output Current | 500 mA continuous, supporting moderate-power analog subsystems without external boost stages |
| Dropout Voltage | 1.1 V at 500 mA and TJ = 25 °C, defining minimum input-to-output differential needed for regulation |
| Ripple Rejection | 54–66 dB at 120 Hz, suppressing AC line noise in unregulated DC inputs before regulation |
| Thermal Resistance (Junction-to-Ambient) | 92 °C/W in DPAK-3 package on standard PCB, guiding heatsink requirements for sustained 500 mA loads |
| Operating Junction Temperature | 0 °C to +125 °C, validated for industrial ambient environments without derating below 500 mA |
| Input Voltage Range | −35 V maximum, allowing use with rectified −24 V or −28 V supplies while maintaining safety margin |
Pinout & Package
DPAK-3 (Case 369C) surface-mount package with exposed drain pad for thermal conduction; dimensions 6.10 × 6.54 × 2.28 mm, pitch 2.29 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Common reference node for input and output; connects internally to substrate and exposed thermal pad |
| 2 | Input | Negative input terminal accepting unregulated −5.0 V to −35 V supply; must be ≥1.1 V more negative than output |
| 3 | Output | Regulated −5.0 V output; requires 1.0 µF capacitor for stability and transient response per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables compact, low-BOM designs for point-of-load negative rail generation without feedback resistors or compensation networks |
| Internal thermal overload protection | Shuts down regulator when junction temperature exceeds safe limit, preventing permanent damage during sustained overload or poor heatsinking |
| Internal short-circuit current limiting | Clamps output current to ~500 mA during output-to-ground faults, protecting both IC and upstream supply |
| Safe-area compensated output transistor | Prevents secondary breakdown under simultaneous high voltage and high current stress, enhancing reliability in industrial transients |
| Pb-free DPAK-3 packaging | Meets RoHS compliance requirements and supports reflow soldering with standard lead-free profiles |
Applications
| Industrial Power Supplies | Analog Signal Conditioning |
|---|---|
Use Scenario: Providing stable −5.0 V bias for dual-supply op-amps and ADC drivers in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Negative voltage regulator establishing reference rail for precision analog front-ends. Use Value: Maintains −5.0 V output within ±4.0% across 0 °C to +125 °C, ensuring consistent offset and gain calibration in sensor interfaces. |
Use Scenario: Biasing JFET-input instrumentation amplifiers in data acquisition modules. IC Role / Device Role / Timing Role: Fixed negative rail generator isolating sensitive analog circuitry from noisy digital domains. Use Value: Delivers 54–66 dB ripple rejection at 120 Hz, reducing mains-borne noise coupling into low-level signal paths. |
| Legacy System Replacement | Embedded Control Subsystems |
Use Scenario: Direct replacement for obsolete TO-220 negative regulators in field-deployed equipment with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Pin-compatible DPAK-3 drop-in alternative to through-hole MC79M05CT variants where board real estate is limited. Use Value: Same electrical performance and thermal characteristics as legacy versions but with surface-mount assembly compatibility and reduced footprint. |
Use Scenario: Generating −5.0 V for microcontroller I/O buffers and level-shifting circuits in motor control gate drivers. IC Role / Device Role / Timing Role: Local negative supply for interface ICs requiring split-rail operation in compact embedded controllers. Use Value: Supports 500 mA peak current with 1.1 V dropout, enabling robust operation during gate-drive switching transients without rail collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative fixed-voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM79M05CDT | Same −5.0 V output, 500 mA rating, and DPAK-3 package; wider input voltage range (−35 V max vs. −35 V), identical dropout and thermal specs | Validated for automotive-grade temperature range (−40 °C to +125 °C) versus MC79M05CDT's 0 °C to +125 °C | Select LM79M05CDT when extended low-temperature operation or AEC-Q200 alignment is required |
| MC79M05BDTRKG | Identical electrical specs and DPAK-3 package; differs only in temperature grade (−40 °C to +125 °C) and Pb-free tape-and-reel packaging (2500 pcs) | Qualified for extended industrial and outdoor deployment where sub-zero startup is critical | Choose MC79M05BDTRKG when full industrial temperature range and automated assembly compatibility are mandatory |
Compared with MC79M05CDT, LM79M05CDT adds −40 °C capability at no cost to regulation accuracy or thermal performance, while MC79M05BDTRKG offers identical ruggedness with broader temperature coverage and volume-friendly packaging-both require no PCB layout changes but differ in qualification scope and logistics format.
Availability
MC79M05CDT is available at Aetrix Electronics and suitable for industrial power supplies, analog signal conditioning, legacy system replacement, and embedded control subsystems requiring stable component supply with verified long-term sourcing.
Supply support for MC79M05CDT 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 specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC79M05CDT belongs to the MC79M00 series of negative voltage regulators, designed specifically for rugged, low-component-count DC power conversion in harsh industrial environments where thermal resilience and fault tolerance are essential.
FAQ
What is the output voltage tolerance of the MC79M05CDT?
The MC79M05CDT has a nominal output voltage of −5.0 V with a tolerance of ±4.0%, meaning the actual output falls between −4.8 V and −5.2 V at TJ = 25 °C. This specification is guaranteed across its operating temperature range of 0 °C to +125 °C and load conditions from 5 mA to 500 mA, as confirmed in the onsemi datasheet revision 16.
Can the MC79M05CDT replace a TO-220 negative regulator on an existing PCB?
The MC79M05CDT uses a DPAK-3 surface-mount package and cannot be directly soldered onto a TO-220 footprint. However, it provides identical electrical performance to TO-220 variants like MC79M05CT, making it suitable for new designs or redesigns where board space is constrained. A dedicated adapter or layout revision is required for retrofitting.
What is the minimum input voltage required for the MC79M05CDT to maintain regulation?
The MC79M05CDT requires the input voltage to be at least 1.1 V more negative than the output voltage under full 500 mA load - i.e., VI ≤ −6.1 V. For reliable operation with input ripple, the datasheet recommends maintaining VI ≤ −7.0 V minimum to ensure regulation across line and load variations.
Does the MC79M05CDT require external capacitors for stability?
Yes - the MC79M05CDT requires a 1.0 µF output capacitor (CO) for stability and improved transient response. An input capacitor (CIN) of 0.33 µF is recommended if the regulator is located appreciably far from the main power supply filter. These values are specified in the standard application circuit on page 1 of the onsemi datasheet.
Is the MC79M05CDT RoHS compliant and lead-free?
Yes - the MC79M05CDT is offered in a Pb-free DPAK-3 package, as indicated by the "G" suffix in ordering codes like MC79M05CDTG and MC79M05CDTRKG. The device complies with RoHS Directive 2011/65/EU and supports standard lead-free reflow soldering profiles.
MC79M05CDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -35V
- Voltage - Output (Min/Fixed):
- -5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.1V @ 500mA (Typ)
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 66dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MC79M05CDT FAQ
1.How can I place an order for MC79M05CDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC79M05CDT 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 MC79M05CDT reliable?
The price and inventory of MC79M05CDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC79M05CDT is usually 5 days.
3.What payment methods are accepted for MC79M05CDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC79M05CDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC79M05CDT?
MC79M05CDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC79M05CDT 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 MC79M05CDT?
For technical support, including MC79M05CDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC79M05CDT requirements.
6.How does Aetrix verify that MC79M05CDT is sourced from the original manufacturer or authorized distributors?
All MC79M05CDT 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 MC79M05CDT meets industry standards.
7.What is the process for return or replacement of MC79M05CDT?
All MC79M05CDT units undergo pre-shipment inspection (PSI). If there is an issue with MC79M05CDT, 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 MC79M05CDT part is unused and in its original packaging.
Return procedure for MC79M05CDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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