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onsemi MC78L15ABDG
- Part No.:
- MC78L15ABDG
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC78L15ABDG.pdf
- Description:
- IC REG LINEAR 15V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,711
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Product details
Overview
MC78L15ABDG from onsemi is a fixed-output +15 V, 100 mA positive linear voltage regulator in SOIC-8 package, featuring internal short-circuit current limiting, thermal shutdown, and no external components required for basic operation. It delivers stable regulation across −40°C to +125°C and is widely used in low-power industrial control, sensor signal conditioning, and microcontroller auxiliary supply rails.
For engineers reviewing the MC78L15ABDG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design implications of dropout voltage (1.7 V), ripple rejection (34–39 dB), output noise (90 µV), thermal resistance (RJA ≈ 120–150°C/W depending on PCB copper), and validated alternative options for automotive-grade or cost-optimized replacements.
Technical Context
The MC78L15ABDG employs a monolithic bipolar pass transistor with built-in bandgap reference, error amplifier, and protection circuitry. Its architecture enables stable regulation without external compensation capacitors in most applications, though input bypassing (≥0.33 µF) is recommended for long trace runs.
It operates with a minimum input-to-output differential of 1.7 V (dropout), supports up to 30 V input (absolute max 35 V), and maintains output accuracy within ±3% over temperature and load (14.4–15.6 V at TJ = 25°C). Thermal shutdown activates at ~150°C junction temperature, and current limiting caps output at ~150 mA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 15 V nominal; ±3% tolerance (14.4–15.6 V) ensures compatibility with 15 V logic and analog subsystems requiring tight DC stability. |
| Maximum Output Current | 100 mA continuous; sufficient for powering small microcontrollers (e.g., PIC12F, STM32L0), op-amps, and digital sensors without derating. |
| Dropout Voltage | 1.7 V typical at 40 mA; dictates minimum input of 16.7 V for full-load 15 V output - critical for battery-powered or low-headroom designs. |
| Ripple Rejection | 34–39 dB at 120 Hz; attenuates line-frequency ripple by ~50×, reducing AC content on regulated rail without additional filtering. |
| Output Noise | 90 µV RMS (10 Hz–100 kHz); low enough for precision analog front-ends (e.g., ADC references, instrumentation amps) without post-regulation filtering. |
| Operating Temperature | −40°C to +125°C junction range; qualified for under-hood automotive, industrial PLCs, and outdoor equipment where ambient extremes occur. |
| Thermal Resistance (RJA) | ~120–150°C/W (SOIC-8, typical PCB layout); requires ≥1 cm² copper pour for full 100 mA operation at 70°C ambient. |
Pinout & Package
MC78L15ABDG uses the SOIC-8 (D Suffix, Case 751) package - an internally modified SO-8 with pins 2, 3, 6, and 7 electrically common to the die attach flag for enhanced thermal performance. Pin 1 is Output, Pin 2 is Ground, Pin 3 is Ground, Pin 4 is Input, Pin 5 is Ground, Pin 6 is Ground, Pin 7 is Ground, Pin 8 is Not Connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output (VOUT) | Regulated +15 V supply node; connects directly to load and output capacitor (0.1 µF recommended). |
| 2, 3, 5, 6, 7 | Ground (GND) | Five ground terminals reduce impedance and improve thermal conduction; must be tied to common system ground plane. |
| 4 | Input (VIN) | Unregulated input (17.5–30 V typical); requires ≥0.33 µF bypass capacitor close to pin for stability under dynamic loads. |
| 8 | No Connect (NC) | Internally unconnected; left floating or tied to ground per layout best practice - no functional impact. |
Key Features
| Feature | Design Value |
|---|---|
| Internal short-circuit current limiting | Protects device and upstream supply during output faults; limits current to ~150 mA, enabling safe operation without external fusing. |
| Thermal overload protection | Shuts down regulator above ~150°C junction temperature; auto-recovery upon cooling avoids latch-up and enables robust field reliability. |
| No external components required | Operates stably with only input/output bypass capacitors - reduces BOM count, board space, and qualification effort in cost-sensitive designs. |
| Pb-free SOIC-8 package | RoHS-compliant D suffix package with enhanced thermal dissipation via internal flag connection; supports automated reflow assembly. |
| AEC-Q100 stress test capability (via NCV variant) | While MC78L15ABDG is not AEC-Q100 certified, its NCV78L15ABDR2G sibling shares identical electrical specs and is PPAP-capable for automotive use. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Powering 4–20 mA transmitter circuits and analog front-end op-amps in factory-floor pressure/temperature transmitters. IC Role / Device Role / Timing Role: Primary 15 V rail generator for signal conditioning stages, isolating sensitive analog circuitry from noisy 24 V plant power. Use Value: 90 µV noise and 34–39 dB ripple rejection preserve 12+ bit ADC accuracy without added LDO filtering or ferrite beads. |
Use Scenario: Supplying 15 V to window lift motor drivers and door lock actuator logic in non-safety-critical body electronics. IC Role / Device Role / Timing Role: Secondary regulated rail derived from vehicle battery (12 V nominal, up to 16 V cranking); handles load dump transients via 35 V abs max rating. Use Value: −40°C to +125°C operation and thermal shutdown ensure reliability across engine bay and cabin environments without derating. |
| Embedded Microcontroller Auxiliary Rail | Legacy Industrial Equipment Retrofit |
|
Use Scenario: Providing clean 15 V bias to external DACs, level shifters, or RS-485 transceivers interfacing with low-power Cortex-M0+ MCUs. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling MCU core I/O from shared 24 V backplane, minimizing ground bounce. Use Value: Five ground pins lower impedance path to PCB ground plane, improving EMI immunity and transient response during digital switching events. |
Use Scenario: Replacing obsolete 7815 TO-220 regulators in aging PLC I/O modules where board space and thermal mass are constrained. IC Role / Device Role / Timing Role: Drop-in functional replacement offering same 15 V output but in compact SOIC-8 with superior thermal coupling to PCB copper. Use Value: RJA ≈ 120°C/W (vs. 65°C/W for TO-220 with heatsink) enables retrofit without mechanical redesign - only solder rework required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCV78L15ABDR2G | Identical electrical specs; AEC-Q100 qualified, PPAP-capable, and rated for automotive temperature range (−40°C to +125°C). | Required for automotive OEM production; supports PPAP documentation and extended reliability testing not needed in industrial prototypes. | Select when automotive qualification, change control, or site-specific manufacturing traceability is mandated. |
| LM78L15ACM/NOPB | Same 15 V/100 mA output but wider initial tolerance (±5% vs. ±3%), higher dropout (2.0 V typ), and SOIC-8 package with standard pinout (no multi-ground flag). | Suitable for cost-sensitive consumer or lab equipment where tighter regulation and thermal performance are non-critical. | Choose for legacy design continuity or dual-sourcing where TI's LM78L15ACM meets spec margin without thermal derating. |
Compared with MC78L15ABDG, NCV78L15ABDR2G adds automotive qualification overhead but identical performance, while LM78L15ACM trades regulation accuracy and thermal efficiency for broader vendor availability and lower unit cost in non-automotive contexts.
Availability
MC78L15ABDG is available at Aetrix Electronics and suitable for industrial sensor interface, embedded microcontroller auxiliary rail, and legacy industrial equipment retrofit applications requiring stable component supply, RoHS compliance, and SOIC-8 surface-mount compatibility.
Supply support for MC78L15ABDG 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, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC78L00A Series was designed to deliver reliable, low-cost fixed-voltage regulation for cost-sensitive embedded systems where simplicity, ruggedness, and wide temperature operation outweigh ultra-low noise or high PSRR requirements.
FAQ
What is the maximum input voltage for MC78L15ABDG?
The absolute maximum input voltage for MC78L15ABDG is 35 V DC for 12–18 V output variants (per datasheet Absolute Maximum Ratings table). For sustained operation, the recommended maximum is 30 V to maintain regulation margin and avoid excessive power dissipation. Exceeding 35 V risks permanent damage even with brief transients.
Does MC78L15ABDG require external capacitors to operate?
MC78L15ABDG does not require external capacitors for basic regulation stability, but a 0.33 µF input bypass capacitor is strongly recommended if the regulator is located >2 inches from the power supply filter, and a 0.1 µF output capacitor improves transient response. These values are specified in Figure 2 and Applications Information section of the datasheet.
What is the thermal resistance (RJA) of MC78L15ABDG in SOIC-8 package?
The thermal resistance junction-to-ambient (RJA) for MC78L15ABDG in SOIC-8 is not fixed - it depends on PCB copper area. Per Figure 8, RJA ranges from ~120°C/W (with 30 mm × 30 mm 2-oz copper) to ~150°C/W (minimal copper). The SOIC-8's internal flag connection lowers RJA versus standard SO-8 packages.
Can MC78L15ABDG be used as a current source?
Yes - MC78L15ABDG can be configured as a constant-current source using the circuit in Figure 9 of the datasheet. With a resistor between output and ground, output current approximates IO ≈ 15 V / R. However, power dissipation must be calculated as P = (VIN − 15 V) × IO, and thermal limits apply.
Is MC78L15ABDG pin-compatible with other MC78LxxA SOIC-8 variants?
Yes - all MC78LxxA SOIC-8 devices (e.g., MC78L05ABDG, MC78L12ABDG) share identical pinout: Pin 1 = VOUT, Pins 2/3/5/6/7 = GND, Pin 4 = VIN, Pin 8 = NC. This allows footprint reuse across output voltages in multi-rail designs, simplifying PCB layout and inventory management for MC78L15ABDG and siblings.
MC78L15ABDG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 15V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 39dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC78L15ABDG FAQ
1.How can I place an order for MC78L15ABDG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L15ABDG 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 MC78L15ABDG reliable?
The price and inventory of MC78L15ABDG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L15ABDG is usually 5 days.
3.What payment methods are accepted for MC78L15ABDG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L15ABDG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L15ABDG?
MC78L15ABDG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L15ABDG 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 MC78L15ABDG?
For technical support, including MC78L15ABDG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L15ABDG requirements.
6.How does Aetrix verify that MC78L15ABDG is sourced from the original manufacturer or authorized distributors?
All MC78L15ABDG 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 MC78L15ABDG meets industry standards.
7.What is the process for return or replacement of MC78L15ABDG?
All MC78L15ABDG units undergo pre-shipment inspection (PSI). If there is an issue with MC78L15ABDG, 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 MC78L15ABDG part is unused and in its original packaging.
Return procedure for MC78L15ABDG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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