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onsemi MC78L05ABD
- Part No.:
- MC78L05ABD
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC78L05ABD.pdf
- Description:
- IC REG LINEAR 5V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,407
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Product details
Overview
MC78L05ABD from onsemi is a 5.0 V, 100 mA fixed-output linear voltage regulator in SOIC-8 package, featuring internal short-circuit current limiting, thermal shutdown, and ±2% output voltage tolerance at +25°C. It operates across −40°C to +125°C and requires no external components for basic regulation in low-power embedded power rails, sensor interfaces, and microcontroller auxiliary supplies.
For engineers reviewing the MC78L05ABD datasheet, pinout, applications, or equivalent options, this device serves as a cost-effective, AEC-Q100-capable (via NCV variant) drop-in replacement for legacy 78L05 regulators where extended temperature range, Pb-free compliance, and SOIC-8 thermal performance are required.
Technical Context
The MC78L05ABD implements a monolithic series-pass transistor architecture with bandgap reference, error amplifier, and protection circuitry integrated into a single die. Its dropout voltage is fixed at 1.7 V (typ) at +25°C, enabling stable regulation when input exceeds 6.7 V under full load.
It delivers 5.0 V output with line regulation of ≤45 mV (8–20 V input) and load regulation of ≤5.0 mV (1–40 mA), while maintaining 49 dB ripple rejection at 120 Hz - confirming suitability for noisy DC-DC post-regulation and automotive subsystems with high conducted EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2% at +25°C - ensures compatibility with 5 V logic families and ADC reference inputs without trimming. |
| Max Output Current | 100 mA - supports low-power MCU cores, I²C peripherals, and analog front-ends without external pass devices. |
| Input Voltage Range | 7.0–20 V DC - accommodates 9 V/12 V battery or rail inputs with ≥2 V headroom for dropout margin. |
| Dropout Voltage | 1.7 V (typ) at +25°C - enables operation from 6.7 V min input, critical for brown-out resilience in automotive cold-crank conditions. |
| Ripple Rejection | 49 dB at 120 Hz - suppresses switching noise from upstream DC-DC converters feeding sensitive analog circuits. |
| Thermal Resistance | RJA = Refer to Figure 8 - SOIC-8 package achieves lower θJA than TO-92 when mounted on ≥30 mm² copper, enabling higher ambient operation. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive, industrial control, and outdoor IoT node applications. |
Pinout & Package
MC78L05ABD uses the SOIC-8 (Case 751) package with internally modified lead frame: pins 2, 3, 6, and 7 are electrically common to the die attach flag, reducing thermal resistance and improving power dissipation capability when PCB copper area is optimized.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOUT | Regulated 5.0 V output - connects directly to load; requires 0.1 µF ceramic capacitor to ground for transient response. |
| 2 | GND | Ground reference for both input and output - electrically tied to die flag; must be low-impedance connection to PCB ground plane. |
| 3 | GND | Second ground terminal - shares internal node with Pin 2; improves thermal conduction and reduces ground loop inductance. |
| 4 | VIN | Unregulated input supply - must exceed 6.7 V; bypassed with 0.33 µF capacitor close to pin for stability. |
| 5 | GND | Third ground terminal - enhances thermal path and current return symmetry for noise-sensitive loads. |
| 6 | GND | Fourth ground terminal - tied to die flag; critical for achieving specified RJA in thermal design. |
| 7 | GND | Fifth ground terminal - completes low-inductance ground network for EMI suppression. |
| 8 | NC | No connect - not bonded; left floating per design; no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Internal thermal shutdown | Activates at TJ ≈ 150°C - prevents permanent damage during sustained overload or poor heatsinking. |
| Short-circuit current limiting | Clamps output current to safe level (~120 mA typ) - avoids fuse blowing or trace burnout in fault conditions. |
| Pb-free SOIC-8 packaging | RoHS-compliant with enhanced thermal performance vs. TO-92 - supports automated SMT assembly and higher power density layouts. |
| No external compensation required | Stable with only input/output bypass capacitors - eliminates tuning effort and component count in space-constrained designs. |
| AEC-Q100 qualification path | NCV78L05A variant is AEC-Q100 Grade 1 qualified - MC78L05ABD shares identical SOIC-8 construction and process, enabling automotive-grade sourcing. |
Applications
| Automotive Body Control Module | Industrial Sensor Node |
|---|---|
Use Scenario: Powering LIN transceivers, door lock actuators, and ambient light sensors in vehicle body electronics. IC Role / Device Role / Timing Role: Primary 5 V rail regulator supplying mixed-signal ASICs and discrete drivers. Use Value: −40°C to +125°C operation and thermal shutdown ensure reliability during engine-off hot soak and cold cranking. | Use Scenario: Providing clean 5 V bias to MEMS accelerometers, RTD signal conditioners, and LoRaWAN transceivers in factory-floor monitoring nodes. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling noisy 12 V field bus inputs. Use Value: 49 dB ripple rejection maintains ADC SNR >70 dB despite 120 Hz harmonics from nearby motor drives. |
| Medical Patient Monitor Front-End | Consumer Smart Home Hub |
Use Scenario: Supplying analog front-end (AFE) ICs and optical pulse oximeter LEDs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-noise 5 V source for precision op-amps and 16-bit SAR ADC references. Use Value: 40 µV RMS output noise (10 Hz–100 kHz) avoids introducing quantization error in sub-mV biomedical signals. | Use Scenario: Regulating power for Wi-Fi SoC, touch controller, and RGB LED driver in voice-controlled home automation hubs. IC Role / Device Role / Timing Role: Secondary regulator downstream of buck converter, cleaning residual switching artifacts. Use Value: SOIC-8 thermal design allows continuous 80 mA output at 60°C ambient without derating - fits compact enclosure constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCV78L05ABDR2G | Identical SOIC-8 package and electrical specs; AEC-Q100 Grade 1 qualified and PPAP capable. | Required for automotive production programs needing certified qualification evidence and change control. | Select NCV78L05ABDR2G when automotive OEM compliance documentation (PPAP, test reports) is mandatory. |
| MC78L05ACDR2G | Same SOIC-8 footprint but rated for 0°C to +125°C (not −40°C); slightly higher output tolerance (±3%) at extremes. | Suitable for commercial/industrial indoor applications where extended low-temp operation is unnecessary. | Choose MC78L05ACDR2G for cost-sensitive non-automotive designs with ambient >0°C. |
Compared with MC78L05ABD, NCV78L05ABDR2G adds formal automotive qualification without altering pinout or thermal behavior, while MC78L05ACDR2G trades low-temperature capability for lower unit cost in benign environments - enabling precise BOM optimization based on end-equipment requirements.
Availability
MC78L05ABD is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, medical front-ends, and consumer smart home hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC78L05ABD 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 manufacturer specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC78L00A Series was designed to deliver rugged, low-cost linear regulation for cost-sensitive, space-constrained applications where simplicity, reliability, and wide operating temperature range outweigh efficiency concerns.
FAQ
What is the maximum input voltage rating for MC78L05ABD?
The absolute maximum input voltage for MC78L05ABD is 35 V for 12–18 V nominal input variants. This rating ensures safe operation during load dump transients in 12 V automotive systems. Exceeding 35 V risks permanent damage due to junction breakdown, even briefly. Always verify input filtering and clamping in high-voltage surge environments before deploying MC78L05ABD.
Does MC78L05ABD require input and output capacitors for stable operation?
Yes - MC78L05ABD requires a 0.33 µF input capacitor (tantalum, ceramic, or mylar) placed directly across pins 4 (VIN) and 2/3/5/6/7 (GND), and a 0.1 µF output capacitor (ceramic preferred) from pin 1 (VOUT) to GND. These capacitors stabilize the control loop, improve transient response, and suppress high-frequency noise; omitting them may cause oscillation or poor regulation under dynamic load changes.
Can MC78L05ABD be used as a current source?
Yes - MC78L05ABD can be configured as a constant-current sink by connecting its output (pin 1) to the load's high side and returning the load's low side to ground, with a sense resistor between pin 4 (VIN) and pin 1 (VOUT). The current equals 5.0 V / R, where R is the sense resistor value; for example, R = 50 Ω yields ~100 mA. Dissipation in MC78L05ABD must remain within SOIC-8 thermal limits.
What is the thermal resistance (RJA) of MC78L05ABD in SOIC-8 package?
MC78L05ABD's RJA is not a fixed value - it depends on PCB copper area. Per Figure 8 in the datasheet, RJA drops from ~120°C/W (no copper) to ~50°C/W with ≥30 mm² of 2 oz. copper connected to pins 2/3/6/7. For 100 mA at 12 V input, power dissipation is ~0.7 W; with 50°C/W, junction rise is ~35°C - keeping TJ well below 150°C at 60°C ambient.
Is MC78L05ABD pin-compatible with older 78L05 variants in SOIC-8?
Yes - MC78L05ABD uses the same SOIC-8 pinout (D suffix, Case 751) as legacy MC78L05CDG and MC78L05BDG parts. Pin 1 = VOUT, Pins 2/3/5/6/7 = GND, Pin 4 = VIN, Pin 8 = NC. No PCB layout changes are needed when upgrading to MC78L05ABD, provided the thermal design accounts for identical package dimensions and internal grounding structure.
MC78L05ABD 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):
- 30V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 49dB (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
MC78L05ABD FAQ
1.How can I place an order for MC78L05ABD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L05ABD 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 MC78L05ABD reliable?
The price and inventory of MC78L05ABD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L05ABD is usually 5 days.
3.What payment methods are accepted for MC78L05ABD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L05ABD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L05ABD?
MC78L05ABD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L05ABD 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 MC78L05ABD?
For technical support, including MC78L05ABD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L05ABD requirements.
6.How does Aetrix verify that MC78L05ABD is sourced from the original manufacturer or authorized distributors?
All MC78L05ABD 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 MC78L05ABD meets industry standards.
7.What is the process for return or replacement of MC78L05ABD?
All MC78L05ABD units undergo pre-shipment inspection (PSI). If there is an issue with MC78L05ABD, 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 MC78L05ABD part is unused and in its original packaging.
Return procedure for MC78L05ABD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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