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onsemi MC79M08CDTRK
- Part No.:
- MC79M08CDTRK
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC79M08CDTRK.pdf
- Description:
- IC REG LINEAR -8V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,669
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Product details
Overview
MC79M08CDTRK from onsemi is a fixed-output, negative-voltage linear regulator delivering −8.0 V at up to 500 mA, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation for rugged operation in industrial power supplies. It operates across 0 °C to +125 °C and uses a DPAK-3 surface-mount package with ground-input-output pinout.
For engineers reviewing the MC79M08CDTRK datasheet, pinout, applications, or equivalent options, key selection criteria include output voltage tolerance (±4.0%), dropout voltage (1.1 V), ripple rejection (63 dB at 120 Hz), thermal resistance (θJA = 92 °C/W), and Pb-free DPAK-3 packaging compatibility with automated SMT assembly.
Technical Context
The MC79M08CDTRK implements a monolithic bipolar linear regulator architecture with built-in protection circuitry including foldback current limiting and thermal foldback. Its internal safe-area compensated output transistor enables stable 500 mA delivery without external components under transient load conditions.
Designed as a complementary negative counterpart to the MC78M00 series, it requires no external capacitors for basic regulation but benefits from 0.33 μF input and 1.0 μF output capacitance for optimal stability and transient response-especially when located remotely from bulk filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −8.0 V nominal, −7.6 V to −8.4 V over full operating range - ensures stable biasing for op-amps and analog circuits requiring precise negative rails. |
| Output Current | 500 mA maximum - supports mid-power analog subsystems such as sensor signal conditioning and audio preamplifiers. |
| Dropout Voltage | 1.1 V typical at 500 mA - allows operation with input as low as −9.1 V while maintaining regulation, reducing heat dissipation vs. higher-dropout alternatives. |
| Ripple Rejection | 63 dB typical at 120 Hz - suppresses rectified AC noise in unregulated DC inputs, critical for low-noise instrumentation applications. |
| Thermal Resistance θJA | 92 °C/W - defines junction-to-ambient rise per watt; requires ≥25 mm² of 2 oz copper pad for full 500 mA capability at TA = 50 °C. |
| Operating Temperature | 0 °C to +125 °C - qualified for commercial/industrial environments excluding extended automotive or military ranges. |
| Protection Features | Internal thermal shutdown and short-circuit current limiting - eliminates need for external foldback or thermal sensors in most embedded designs. |
Pinout & Package
DPAK-3 (Case 369C) surface-mount package: 6.10 mm × 6.54 mm × 2.28 mm body, 2.29 mm lead pitch, thermally enhanced exposed drain tab (pin 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Reference node for regulation; must be low-impedance connection to system ground plane to maintain stability and noise immunity. |
| 2 | Input | Negative input terminal; accepts −9.1 V to −35 V DC; requires local 0.33 μF ceramic capacitor if >5 cm from bulk filter. |
| 3 | Output | Regulated −8.0 V output; connects to 1.0 μF tantalum or ceramic capacitor to improve transient response and reduce output noise. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation with integrated pass transistor and error amplifier - reduces BOM count and PCB area in space-constrained designs. |
| Internal thermal overload protection | Automatic shutdown below 150 °C junction temperature - prevents permanent damage during sustained overload or poor heatsinking. |
| Safe-area compensated output transistor | Enables reliable 500 mA delivery without secondary SOA derating calculations - simplifies thermal design for continuous-duty applications. |
| Pb-free DPAK-3 package | RoHS-compliant surface-mount footprint compatible with standard reflow profiles - supports automated manufacturing and environmental compliance. |
| Output noise voltage | 60 μV RMS (10 Hz–100 kHz) - suitable for low-noise analog stages where reference rail purity affects ADC SNR or op-amp THD. |
Applications
| Industrial Power Supply | Audio Signal Conditioning |
|---|---|
Use Scenario: Providing regulated −8 V rail for dual-supply op-amps in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Negative voltage regulator supplying bias to precision instrumentation amplifiers and analog multiplexers. Use Value: Maintains ±0.1% output stability over temperature and line variations, ensuring consistent gain calibration and offset nulling accuracy. |
Use Scenario: Generating clean negative supply for headphone amplifier ICs in portable audio DAC systems. IC Role / Device Role / Timing Role: Low-noise negative rail generator decoupled from noisy digital domains via separate LDO stage. Use Value: 60 μV RMS noise and 63 dB ripple rejection preserve dynamic range and prevent audible hum in 24-bit audio paths. |
| Sensor Interface Circuit | Legacy System Retrofit |
Use Scenario: Biasing bridge-based pressure transducers and strain gauges in HVAC control panels. IC Role / Device Role / Timing Role: Stable negative reference source for Wheatstone bridge excitation and differential amplifier front-ends. Use Value: ±4.0% output tolerance and 0.4 mV/°C tempco ensure measurement repeatability across 0–70 °C ambient operating range. |
Use Scenario: Replacing obsolete TO-220 regulators in aging medical device power boards with modern SMT-compatible solution. IC Role / Device Role / Timing Role: Drop-in functional replacement for legacy negative regulators using same schematic topology and footprint adaptation. Use Value: Identical electrical behavior and DPAK-3 thermal profile enable direct PCB redesign without layout revalidation or thermal modeling changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7908CDT | Same −8 V output, but higher dropout (2.0 V typ), lower ripple rejection (55 dB), and TO-220 package only. | Requires larger heatsink and cannot support same input voltage headroom; unsuitable for compact SMT-only designs. | Select LM7908CDT only when TO-220 mounting and legacy compatibility outweigh efficiency and footprint advantages. |
| MC79M08BDTRKG | Identical DPAK-3 package and electrical specs, but rated for −40 °C to +125 °C industrial temperature range. | Valid for extended ambient environments (e.g., outdoor enclosures, motor drives); not required for indoor commercial use. | Choose MC79M08BDTRKG when operating below 0 °C or above 85 °C is expected; otherwise MC79M08CDTRK offers cost and qualification advantage. |
Compared with LM7908CDT, MC79M08CDTRK delivers 0.9 V lower dropout and 8 dB better ripple rejection in a smaller, RoHS-compliant DPAK-3 package-reducing thermal overhead and board area. Against MC79M08BDTRKG, it trades extended temperature rating for tighter cost control and simplified qualification in commercial-grade applications.
Availability
MC79M08CDTRK is available at Aetrix Electronics and suitable for industrial power supplies, audio signal conditioning, sensor interface circuits, and legacy system retrofits requiring stable component supply with full traceability and lifecycle management.
Supply support for MC79M08CDTRK 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 MC79M00 series was designed specifically to provide robust, low-cost negative voltage regulation for commercial and industrial equipment-complementing the MC78M00 positive regulators with matched protection features and thermal performance.
FAQ
What is the maximum input voltage rating for MC79M08CDTRK?
The MC79M08CDTRK has an absolute maximum input voltage rating of −35 V DC. Operation beyond this limit risks permanent damage due to junction breakdown. For reliable long-term use, keep input within −9.1 V to −25 V to maintain regulation margin and minimize power dissipation-especially at elevated ambient temperatures.
Does MC79M08CDTRK require external capacitors for stable operation?
MC79M08CDTRK does not require external capacitors for basic regulation, but a 0.33 μF ceramic capacitor at the input and 1.0 μF tantalum or ceramic capacitor at the output are strongly recommended. These improve transient response, suppress high-frequency noise, and ensure stability when the regulator is placed more than 5 cm from bulk filtering-per onsemi's standard application guidance.
What is the thermal resistance and how does it affect MC79M08CDTRK performance?
MC79M08CDTRK has a junction-to-ambient thermal resistance (θJA) of 92 °C/W in the DPAK-3 package. At 500 mA output and 1.1 V dropout, power dissipation is ~0.55 W-resulting in ~51 °C junction rise above ambient. With a 50 °C ambient, junction temperature reaches ~101 °C, well within the 125 °C max rating. Adequate copper area (≥25 mm² of 2 oz) is essential to achieve this θJA.
Is MC79M08CDTRK pin-compatible with other MC79Mxx regulators?
Yes-MC79M08CDTRK shares identical DPAK-3 pinout (ground-input-output) and electrical interface with all MC79Mxx variants (e.g., MC79M05CDTRK, MC79M12CDTRK). This allows direct substitution in designs where output voltage is adjusted via feedback or external circuitry, provided input voltage headroom and thermal limits are verified for the new output level.
What protection features are built into MC79M08CDTRK?
MC79M08CDTRK integrates three core protection functions: (1) internal short-circuit current limiting with foldback behavior, (2) thermal shutdown that activates near 150 °C junction temperature, and (3) safe-area compensation for the output transistor. These eliminate the need for external current-sense resistors, thermal cutoffs, or SOA protection networks in most standard applications.
MC79M08CDTRK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -35V
- Voltage - Output (Min/Fixed):
- -8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.1V @ 500mA (Typ)
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 63dB (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
MC79M08CDTRK FAQ
1.How can I place an order for MC79M08CDTRK through Aetrix?
Please submit a Request for Quotation (RFQ) for MC79M08CDTRK 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 MC79M08CDTRK reliable?
The price and inventory of MC79M08CDTRK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC79M08CDTRK is usually 5 days.
3.What payment methods are accepted for MC79M08CDTRK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC79M08CDTRK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC79M08CDTRK?
MC79M08CDTRK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC79M08CDTRK 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 MC79M08CDTRK?
For technical support, including MC79M08CDTRK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC79M08CDTRK requirements.
6.How does Aetrix verify that MC79M08CDTRK is sourced from the original manufacturer or authorized distributors?
All MC79M08CDTRK 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 MC79M08CDTRK meets industry standards.
7.What is the process for return or replacement of MC79M08CDTRK?
All MC79M08CDTRK units undergo pre-shipment inspection (PSI). If there is an issue with MC79M08CDTRK, 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 MC79M08CDTRK part is unused and in its original packaging.
Return procedure for MC79M08CDTRK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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