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onsemi MC79M15CDT
- Part No.:
- MC79M15CDT
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC79M15CDT.pdf
- Description:
- IC REG LINEAR -15V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,089
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Product details
Overview
MC79M15CDT from onsemi is a fixed-output negative voltage regulator delivering −15 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 requires no external components for basic regulation.
For engineers reviewing the MC79M15CDT datasheet, pinout, applications, or equivalent options, this page provides verified specifications, DPAK-3 package details, real-world use scenarios, and validated alternative options for negative rail regulation in embedded and industrial systems.
Technical Context
The MC79M15CDT implements a monolithic bipolar linear regulator architecture with built-in protection circuitry including current limiting, thermal overload shutdown, and output transistor safe-area compensation. Its design targets stable DC negative supply generation without external pass elements or feedback networks.
It maintains −15 V output with ±4% tolerance over load (5–500 mA), line (−17.5 V to −30 V input), and temperature (0 °C to +125 °C) variations. Dropout voltage is specified at 1.1 V (IO = 500 mA, TJ = 25 °C), and ripple rejection reaches 60 dB at 120 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −15 V nominal, −14.25 V to −15.75 V over full operating range - ensures compatibility with −15 V logic and analog subsystems. |
| Output Current | 500 mA maximum - supports moderate-power analog circuits, op-amp rails, and legacy TTL/CMOS negative supplies. |
| Input Voltage Range | −17.5 V to −30 V - mandates ≥1.1 V headroom above output for regulation; compatible with unregulated −24 V or −30 V bus designs. |
| Dropout Voltage | 1.1 V at 500 mA - defines minimum input-to-output differential required to sustain regulation under full load. |
| Thermal Resistance (Junction-to-Ambient) | 92 °C/W (DPAK-3, free air) - dictates heatsink requirement: ~25 °C/W needed for 500 mA at TA = 50 °C per Figure 1. |
| Ripple Rejection | 60 dB at 120 Hz - suppresses rectified AC noise from transformer-based supplies before reaching sensitive analog stages. |
| Operating Temperature | 0 °C to +125 °C junction - qualified for commercial and extended-temperature industrial environments without derating. |
Pinout & Package
DPAK-3 (Case 369C) surface-mount package: thermally enhanced plastic outline with exposed drain pad (pin 2) for PCB copper area heat sinking. Dimensions: 6.10 × 6.54 × 2.28 mm, 2.29 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Reference node for output voltage and internal bias; must connect to low-impedance system ground plane. |
| 2 | Input | Negative input terminal; accepts unregulated −17.5 V to −30 V; requires local 0.33 µF ceramic bypass capacitor. |
| 3 | Output | Regulated −15 V source; requires 1.0 µF tantalum or aluminum electrolytic for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Internal feedback network and pass transistor eliminate need for external resistors or capacitors in basic configuration. |
| Internal thermal overload protection | Shuts down output when junction temperature exceeds safe limit; auto-recovers after cooldown - prevents permanent damage during fault conditions. |
| Internal short-circuit current limiting | Clamps output current to ~700 mA typical - protects both regulator and downstream circuitry during output faults. |
| Safe-area compensated output transistor | Prevents second breakdown during high-voltage/high-current transients - enables reliable operation with capacitive loads and line surges. |
| Pb-free DPAK-3 packaging | RoHS-compliant construction with matte tin lead finish - meets global environmental compliance requirements for surface-mount assembly. |
Applications
| Industrial Power Supply | Legacy Analog Instrumentation |
|---|---|
|
Use Scenario: Regulating −24 V unregulated bus to clean −15 V for op-amp biasing and signal conditioning in programmable logic controllers. IC Role / Device Role / Timing Role: Negative linear voltage regulator providing stable reference rail for precision amplifiers and ADC drivers. Use Value: Eliminates need for discrete transistor-based regulators; thermal shutdown ensures reliability during ambient temperature excursions. |
Use Scenario: Powering vintage test equipment requiring dual ±15 V rails where only −24 V or −30 V is available from main supply. IC Role / Device Role / Timing Role: Fixed-output negative regulator generating compliant −15 V rail for operational amplifier front-ends and analog multiplexers. Use Value: ±4% output tolerance and 60 dB ripple rejection preserve signal integrity in low-noise measurement paths. |
| Embedded Control Module | Telecom Line Card Bias |
|
Use Scenario: Providing −15 V bias to RS-232 transceivers and level-shifting interfaces in fanless industrial gateways. IC Role / Device Role / Timing Role: Compact negative rail generator mounted directly on control board with minimal PCB footprint. Use Value: DPAK-3 package enables automated SMT assembly and efficient thermal coupling to 2 oz. copper ground planes. |
Use Scenario: Generating −15 V bias for analog front-end components in telecom line interface cards operating from −48 V central office supply. IC Role / Device Role / Timing Role: Intermediate negative regulator stepping down −48 V to −15 V for analog signal processing ICs. Use Value: 1.1 V dropout allows efficient conversion from −48 V bus while maintaining regulation during input ripple. |
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 |
|---|---|---|---|
| LM7915CDT | Same −15 V output, but higher dropout (1.3 V typ), lower ripple rejection (50 dB), and wider output tolerance (±5%). | Less suitable for low-headroom or high-PSRR applications; acceptable where cost or legacy design reuse is prioritized. | Select LM7915CDT only if existing layout uses TO-220 or if tighter PSRR is not required. |
| MC79M15BDTRKG | Identical electrical specs and DPAK-3 package, but rated for −40 °C to +125 °C instead of 0 °C to +125 °C. | Required for automotive or extended-temperature industrial deployments; otherwise functionally interchangeable. | Choose MC79M15BDTRKG when operation below 0 °C is mandatory; otherwise MC79M15CDT suffices for commercial-grade systems. |
Compared with LM7915CDT, MC79M15CDT delivers superior ripple rejection and lower dropout, enabling cleaner analog rails from noisy inputs. Against MC79M15BDTRKG, it trades extended temperature range for lower cost and same performance within 0–125 °C - ideal for cost-sensitive commercial applications.
Availability
MC79M15CDT is available at Aetrix Electronics and suitable for industrial power supplies, embedded control modules, legacy analog instrumentation, and telecom line card biasing requiring stable component supply and long-term manufacturability.
Supply support for MC79M15CDT 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 sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC79M00 series was designed specifically to provide robust, drop-in complementary negative regulators for the widely adopted MC78M00 positive regulator family - targeting cost-effective, space-constrained industrial and embedded power systems.
FAQ
What is the maximum input voltage rating for the MC79M15CDT?
The MC79M15CDT has an absolute maximum input voltage rating of −35 Vdc. Operation beyond this value risks permanent device damage. For reliable regulation, the input must remain at least 1.1 V more negative than the output (i.e., ≤ −16.1 V) even at the peak of input ripple - typically −17.5 V to −30 V is recommended per datasheet test conditions.
Does the MC79M15CDT require external capacitors, and if so, what values are recommended?
Yes, the MC79M15CDT requires external capacitors for stability and performance. A 0.33 µF ceramic capacitor is recommended at the input (close to pins 1 and 2), and a 1.0 µF tantalum or aluminum electrolytic capacitor at the output (pins 1 and 3). These values improve transient response and prevent oscillation - especially critical when the regulator is located remotely from bulk filtering.
Is the MC79M15CDT pin-compatible with the LM7915 series?
No, the MC79M15CDT is not pin-compatible with the LM7915 series. While both are −15 V negative regulators, the MC79M15CDT uses the DPAK-3 (Case 369C) package with pin 1 = Ground, pin 2 = Input, pin 3 = Output, whereas standard LM7915 variants use TO-220 (Case 221AB) with pin 1 = Output, pin 2 = Ground, pin 3 = Input. Layout redesign is required for substitution.
What thermal management is required for the MC79M15CDT at full 500 mA load?
At 500 mA continuous load with TA = 50 °C, the MC79M15CDT dissipates approximately 5.5 W (VI ≈ −23 V, VO = −15 V → ΔV = 8 V × 0.5 A = 4 W, plus quiescent loss). With θJA = 92 °C/W in free air, a heatsink or PCB copper area reducing thermal resistance to ≤25 °C/W is required to keep TJ ≤125 °C. Refer to Figure 1 in the datasheet for DPAK-3 copper length vs. thermal resistance curves.
Can the MC79M15CDT be used in automotive applications?
The MC79M15CDT is rated for 0 °C to +125 °C junction temperature, making it suitable for under-hood automotive applications only if ambient temperature and power dissipation are tightly controlled to ensure TJ remains within spec. For guaranteed −40 °C startup and full-temperature-range reliability, the MC79M15BDTRKG (−40 °C to +125 °C) is the qualified automotive-grade variant.
MC79M15CDT 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):
- -15V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.1V @ 500mA (Typ)
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 60dB (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
MC79M15CDT FAQ
1.How can I place an order for MC79M15CDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC79M15CDT 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 MC79M15CDT reliable?
The price and inventory of MC79M15CDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC79M15CDT is usually 5 days.
3.What payment methods are accepted for MC79M15CDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC79M15CDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC79M15CDT?
MC79M15CDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC79M15CDT 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 MC79M15CDT?
For technical support, including MC79M15CDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC79M15CDT requirements.
6.How does Aetrix verify that MC79M15CDT is sourced from the original manufacturer or authorized distributors?
All MC79M15CDT 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 MC79M15CDT meets industry standards.
7.What is the process for return or replacement of MC79M15CDT?
All MC79M15CDT units undergo pre-shipment inspection (PSI). If there is an issue with MC79M15CDT, 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 MC79M15CDT part is unused and in its original packaging.
Return procedure for MC79M15CDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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