My Inquiry
My Account
onsemi MC79M15BDT
- Part No.:
- MC79M15BDT
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC79M15BDT.pdf
- Description:
- IC REG LINEAR -15V 500MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,082
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC79M15BDT from onsemi is a fixed-output, 500 mA negative voltage regulator delivering −15 V with ±4.0% output tolerance, thermal shutdown, short-circuit current limiting, and safe-area compensation. It operates across −40 °C to +125 °C and is designed for industrial power supply rails requiring stable low-noise DC bias in analog front-ends and legacy system retrofits.
For engineers reviewing the MC79M15BDT datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (1.1 V), ripple rejection (54–60 dB at 120 Hz), thermal resistance (92 °C/W junction-to-ambient in DPAK), and compatibility with standard −15 V rail designs using minimal external capacitance.
Technical Context
The MC79M15BDT implements a monolithic bipolar linear regulator architecture with internal current limiting, thermal overload protection, and output transistor safe-area compensation. Its design ensures robust operation under sustained load and transient overcurrent without external protection circuitry.
It requires no external components for basic regulation but benefits from input (0.33 μF) and output (1.0 μF) capacitors to improve stability and transient response. Input voltage must remain ≥1.1 V more negative than output even at ripple peaks, enforcing a minimum −16.1 V input for reliable −15 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | −15 V nominal, −14.25 V to −15.75 V over full operating range - defines stable bias point for op-amp supplies and sensor interfaces. |
| Output Current | 500 mA maximum continuous - supports moderate-power analog subsystems without heatsinking below 50 °C ambient. |
| Dropout Voltage | 1.1 V typical at 500 mA - determines minimum input headroom required to maintain regulation under load. |
| Ripple Rejection | 54 dB min at 120 Hz - suppresses rectified AC noise from unregulated DC sources feeding the regulator. |
| Thermal Resistance (J-A) | 92 °C/W in DPAK package - sets power dissipation limit to ~0.55 W at 50 °C ambient before thermal shutdown. |
| Operating Temperature | −40 °C to +125 °C junction - enables use in automotive under-hood and industrial control cabinet environments. |
| Input Voltage Range | −35 V max - allows compatibility with −24 V or −28 V intermediate bus architectures with margin. |
Pinout & Package
DPAK-3 (Case 369C) surface-mount package with 3 terminals: Pin 1 = Ground, Pin 2 = Input (VI), Pin 3 = Output (VO). Thermal pad on underside enhances PCB heat transfer; recommended copper area per Figure 1 improves power handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Common reference node for input and output; must be low-impedance path to minimize noise coupling and ensure regulation accuracy. |
| 2 | Input | Negative input terminal accepting −16.1 V to −35 V; requires local 0.33 μF ceramic capacitor if >5 cm from bulk filter. |
| 3 | Output | Regulated −15 V source; 1.0 μF output capacitor improves transient response and prevents oscillation under dynamic loads. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables compact, low-BOM-cost implementation for basic −15 V regulation without feedback resistors or compensation networks. |
| Internal thermal overload protection | Automatically disables output when junction temperature exceeds safe limit, preventing permanent damage during overload or poor heatsinking. |
| Internal short-circuit current limiting | Clamps output current to ~600 mA during fault, protecting both regulator and downstream circuitry without external fusing. |
| Safe-area compensated output transistor | Prevents secondary breakdown under high-voltage/high-current stress, enabling reliable operation across full VI–VO differential range. |
| Pb-free DPAK-3 package | RoHS-compliant surface-mount footprint compatible with standard reflow profiles and automated assembly lines. |
Applications
| Industrial Power Supply Rails | Analog Signal Conditioning |
|---|---|
Use Scenario: Providing clean −15 V bias to dual-supply op-amps and precision ADC drivers in PLC I/O modules. IC Role / Device Role / Timing Role: Negative voltage regulator establishing stable reference rail for signal chain integrity. Use Value: Maintains PSRR >54 dB against 120 Hz ripple from transformer-rectifier inputs, minimizing offset drift in 16-bit measurement systems. |
Use Scenario: Biasing JFET-input instrumentation amplifiers and voltage-controlled oscillators in test equipment. IC Role / Device Role / Timing Role: Low-noise negative supply generator supporting sub-mV input-referred noise performance. Use Value: Delivers <90 μV RMS output noise (10 Hz–100 kHz), preserving dynamic range in high-gain analog front-ends. |
| Legacy System Retrofits | Embedded Control Subsystems |
Use Scenario: Replacing obsolete TO-220 −15 V regulators in field-deployed telecom line cards with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Drop-in functional replacement offering identical electrical behavior in smaller DPAK footprint. Use Value: Same −15 V output spec and protection features as MC79M15BT, enabling board-level redesign without schematic change. |
Use Scenario: Generating auxiliary −15 V for microcontroller-based motor drive gate bias or isolated interface ICs. IC Role / Device Role / Timing Role: Dedicated negative rail generator supporting isolated level-shifting and gate drive circuits. Use Value: Withstands −35 V input transients and delivers 500 mA continuously, ensuring reliability in noisy industrial EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7915CDT | ±2% output tolerance (tighter), higher dropout (1.3 V), lower ripple rejection (45 dB), −55 °C to +125 °C rating | Better precision for lab-grade instruments; less suitable for high-ripple or high-ambient-temp environments | Select LM7915CDT when tighter output voltage accuracy is critical and input headroom permits higher dropout. |
| MC7915CT | TO-220 through-hole package, same −15 V/500 mA spec, higher thermal resistance (65 °C/W J-A), Pb-free option available | Preferred for prototyping, manual repair, or legacy through-hole production lines | Choose MC7915CT where mechanical mounting, serviceability, or thermal mass outweighs PCB area constraints. |
Compared with LM7915CDT and MC7915CT, the MC79M15BDT offers superior ripple rejection and thermal performance in surface-mount form, making it optimal for space-constrained industrial boards where noise immunity and ambient temperature resilience are prioritized over absolute voltage tolerance.
Availability
MC79M15BDT is available at Aetrix Electronics and suitable for industrial power supply rails, analog signal conditioning, legacy system retrofits, and embedded control subsystems requiring stable component supply with long-term lifecycle support.
Supply support for MC79M15BDT 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 rugged, fixed-output negative voltage regulation for legacy and new industrial systems needing simple, reliable, and thermally robust DC-DC conversion without switching noise.
FAQ
What is the maximum input voltage rating for the MC79M15BDT?
The MC79M15BDT has a maximum input voltage rating of −35 V DC. Exceeding this value risks permanent device damage due to junction breakdown. This rating allows safe operation from −24 V or −28 V intermediate buses with sufficient margin for ripple and transients, and is explicitly defined in the Absolute Maximum Ratings table of the official datasheet.
Does the MC79M15BDT require external capacitors to function properly?
Yes, the MC79M15BDT requires an input capacitor (0.33 μF) if located appreciable distance (>5 cm) from the main filter, and an output capacitor (1.0 μF) to ensure stability and improve transient response. These values are specified in the Standard Application diagram and confirmed in the datasheet notes - omitting them may cause oscillation or poor regulation under dynamic load conditions.
What protection features does the MC79M15BDT include?
The MC79M15BDT integrates three core protection features: internal thermal overload protection that disables output above safe junction temperature, internal short-circuit current limiting that caps output current to ~600 mA, and output transistor safe-area compensation to prevent secondary breakdown. These functions operate autonomously without external components, as verified in the Features and Electrical Characteristics sections of the datasheet.
Is the MC79M15BDT pin-compatible with the TO-220 version MC79M15BT?
No, the MC79M15BDT (DPAK-3) and MC79M15BT (TO-220-3) share identical electrical functionality and pin numbering (1 = GND, 2 = IN, 3 = OUT), but differ physically in footprint, thermal characteristics, and mounting method. They are not mechanically interchangeable - PCB layout revision is required to switch between packages, though schematic connectivity remains unchanged.
What is the typical dropout voltage of the MC79M15BDT at full load?
The typical dropout voltage of the MC79M15BDT is 1.1 V at 500 mA output current and 25 °C junction temperature. This means the input must be at least −16.1 V to sustain −15 V output under full load, as confirmed in the "Dropout Voltage" row of the MC79M15B/C Electrical Characteristics table on page 4 of the datasheet.
MC79M15BDT 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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
MC79M15BDT FAQ
1.How can I place an order for MC79M15BDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC79M15BDT 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 MC79M15BDT reliable?
The price and inventory of MC79M15BDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC79M15BDT is usually 5 days.
3.What payment methods are accepted for MC79M15BDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC79M15BDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC79M15BDT?
MC79M15BDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC79M15BDT 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 MC79M15BDT?
For technical support, including MC79M15BDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC79M15BDT requirements.
6.How does Aetrix verify that MC79M15BDT is sourced from the original manufacturer or authorized distributors?
All MC79M15BDT 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 MC79M15BDT meets industry standards.
7.What is the process for return or replacement of MC79M15BDT?
All MC79M15BDT units undergo pre-shipment inspection (PSI). If there is an issue with MC79M15BDT, 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 MC79M15BDT part is unused and in its original packaging.
Return procedure for MC79M15BDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC79M15BDT 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…
