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onsemi MC78L05ACDX
- Part No.:
- MC78L05ACDX
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC78L05ACDX.pdf
- Description:
- IC REG LINEAR 5V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,647
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Product details
Overview
MC78L05ACDX from ON Semiconductor is a fixed-output +5 V, 100 mA positive linear voltage regulator in an 8-pin SOIC package with ±5% output tolerance, thermal overload protection, and short-circuit current limiting-used for local regulation in microcontroller peripherals, sensor interfaces, and low-power logic supplies.
For engineers reviewing the MC78L05ACDX datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (1.7 V), ripple rejection (41–80 dB), load regulation (5–60 mV), and operating temperature range (−40°C to +125°C) under 40 mA load conditions.
Technical Context
This device implements a monolithic series-pass regulator architecture with internal reference, error amplifier, short-circuit foldback, and thermal shutdown circuitry. It requires no external components for basic operation but benefits from input (0.33 µF) and output (0.1 µF) ceramic capacitors for stability and transient response.
Designed for fixed-voltage regulation only, it lacks adjustable feedback or enable functionality. Its 8-SOIC package supports surface-mount assembly and provides lower thermal resistance (RθJA = 160°C/W) than TO-92 or SOT-89 variants, enabling higher ambient temperature operation at rated current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +5.0 V ±5% (4.75–5.25 V across full temp/load range) |
| Max Output Current | 100 mA (continuous; derated above 25°C ambient per RθJA) |
| Dropout Voltage | 1.7 V at 25°C (minimum headroom needed between input and output) |
| Ripple Rejection | 41–80 dB at 120 Hz (attenuates AC line noise on input supply) |
| Line Regulation | 6–150 mV (output change over 7–20 V input variation) |
| Load Regulation | 5–60 mV (output change from 1 mA to 40 mA load) |
| Quiescent Current | 2.0–5.5 mA (supply current consumed when regulating, impacts light-load efficiency) |
| Operating Temp | −40°C to +125°C (supports industrial and automotive under-hood environments) |
Pinout & Package
The MC78L05ACDX uses an 8-pin SOIC (Small Outline Integrated Circuit) package with exposed pad for thermal enhancement. Pin 1 is Output, Pin 2 is Ground, Pins 3–4 and 5–6 are No Connect (NC), Pin 7 is Ground, and Pin 8 is Input.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated +5 V supply rail; must be decoupled with 0.1 µF capacitor near load |
| 2 | GND | Analog ground reference for internal error amplifier and reference |
| 3, 4 | NC | No internal connection; electrically isolated; may be left floating or tied to GND for mechanical stability |
| 5, 6 | NC | No internal connection; electrically isolated; not used in regulator function |
| 7 | GND | Second ground terminal-improves thermal conduction and reduces ground impedance |
| 8 | Input | Unregulated DC input (7–30 V); requires 0.33 µF bypass capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Thermal Overload Protection | Shuts down output when junction temperature exceeds ~150°C, preventing permanent damage during sustained overload or poor heatsinking |
| Short-Circuit Current Limiting | Folds back output current to ~100 mA during output-to-ground fault, limiting power dissipation and enabling safe recovery |
| ±5% Output Tolerance | Guaranteed initial accuracy enables direct replacement of legacy 78L05 designs without recalibration of downstream analog circuitry |
| Low Quiescent Current | 2.0–5.5 mA operation allows use in battery-backed or always-on subsystems where standby power matters |
| High Ripple Rejection | Up to 80 dB attenuation at 120 Hz permits clean regulation from rectified AC supplies without additional filtering stages |
Applications
| Industrial Sensor Node | Microcontroller I/O Supply |
|---|---|
Use Scenario: Powering analog temperature/humidity sensors and signal-conditioning op-amps in factory-floor monitoring nodes. IC Role / Device Role / Timing Role: Local +5 V regulator delivering stable bias to precision ADC references and sensor excitation circuits. Use Value: Maintains <±10 mV output deviation across −40°C to +85°C ambient and 1–40 mA load swing, ensuring sensor measurement repeatability. | Use Scenario: Supplying GPIO, UART, and SPI interface logic in ARM Cortex-M0+ based edge controllers. IC Role / Device Role / Timing Role: Dedicated low-noise +5 V rail isolating digital I/O from noisy main system supply. Use Value: 40 µV/VO output noise and 80 dB ripple rejection prevent bit errors in level-shifted communication lines. |
| Legacy Equipment Retrofit | Automotive Body Control Module |
Use Scenario: Replacing obsolete 78L05 variants in aging test equipment requiring RoHS-compliant, drop-in SOIC replacements. IC Role / Device Role / Timing Role: Pin-compatible upgrade path for through-hole TO-92 designs using adapter PCBs or rework. Use Value: Identical electrical specs and ±5% tolerance ensure functional equivalence without firmware or layout changes. | Use Scenario: Regulating +5 V for LIN transceivers, LED drivers, and window motor control logic in non-safety-critical body modules. IC Role / Device Role / Timing Role: Secondary regulator fed from vehicle's 12 V battery rail, handling load dumps up to 35 V input. Use Value: Absolute maximum input rating of 35 V (for 12 V systems) and −40°C to +125°C operation meet AEC-Q100 Grade 2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM78L05ACDX | Same electrical specs and pinout; manufactured by TI (not ON Semi); slightly higher typical quiescent current (2.5–6.0 mA) | Identical use cases; validated in TI reference designs for industrial PLC I/O modules | Select LM78L05ACDX if dual-sourcing or TI-design ecosystem alignment is required |
| MC78L05ABD | Same family, tighter ±2% output tolerance; same 8-SOIC package; identical thermal and protection specs | Better suited for precision analog front-ends where initial accuracy affects calibration validity | Choose MC78L05ABD when system-level accuracy budget demands <±25 mV output deviation at 25°C |
Compared with LM78L05ACDX and MC78L05ABD, the MC78L05ACDX offers the best balance of cost, availability, and ±5% tolerance for general-purpose embedded regulation-making it ideal for cost-sensitive industrial and consumer applications where moderate accuracy suffices.
Availability
MC78L05ACDX is available at Aetrix Electronics and suitable for industrial sensor nodes, microcontroller I/O supplies, and legacy equipment retrofits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MC78L05ACDX 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The MC78LXXA series was designed as a modern, high-reliability replacement for legacy 78Lxx regulators-targeting space-constrained, thermally demanding applications in industrial automation and automotive body electronics.
FAQ
What is the maximum input voltage for MC78L05ACDX?
The MC78L05ACDX supports a maximum input voltage of 30 V for 5 V output versions. This rating applies across the full operating temperature range and ensures safe operation with standard 24 V industrial rails or rectified AC inputs. Exceeding this voltage risks permanent damage due to internal junction breakdown, even with thermal protection active.
Does MC78L05ACDX require external capacitors to operate?
Yes, MC78L05ACDX requires a 0.33 µF input capacitor and recommends a 0.1 µF output capacitor for stable regulation. These values are specified in the datasheet for all operating conditions; omitting them may cause oscillation or poor transient response. Ceramic capacitors placed within 5 mm of their respective pins are strongly recommended.
Is MC78L05ACDX pin-compatible with TO-92 versions like LM78L05ACZ?
No, MC78L05ACDX is not pin-compatible with TO-92 versions such as LM78L05ACZ. The MC78L05ACDX uses an 8-pin SOIC package with dedicated Input (Pin 8), Output (Pin 1), and dual Ground (Pins 2 & 7) terminals, whereas TO-92 variants use a 3-pin configuration (Input–GND–Output). PCB redesign is required for migration.
What is the thermal resistance of MC78L05ACDX in its 8-SOIC package?
The MC78L05ACDX has a junction-to-air thermal resistance (RθJA) of 160°C/W in the 8-SOIC package. This value assumes standard JEDEC 2-layer board layout with 1 in² copper pour. With proper PCB copper area and thermal vias, actual thermal performance improves significantly-enabling 100 mA continuous output up to +85°C ambient.
Can MC78L05ACDX be used in automotive applications?
Yes, MC78L05ACDX is qualified for automotive body electronics applications. Its −40°C to +125°C operating temperature range, 35 V absolute maximum input rating (for 12 V systems), and built-in thermal shutdown meet core requirements for non-safety-critical modules such as door control units and lighting drivers-though it is not AEC-Q100 certified out-of-box and requires system-level validation.
MC78L05ACDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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):
- 5.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB (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
MC78L05ACDX FAQ
1.How can I place an order for MC78L05ACDX through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L05ACDX 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 MC78L05ACDX reliable?
The price and inventory of MC78L05ACDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L05ACDX is usually 5 days.
3.What payment methods are accepted for MC78L05ACDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L05ACDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L05ACDX?
MC78L05ACDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L05ACDX 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 MC78L05ACDX?
For technical support, including MC78L05ACDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L05ACDX requirements.
6.How does Aetrix verify that MC78L05ACDX is sourced from the original manufacturer or authorized distributors?
All MC78L05ACDX 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 MC78L05ACDX meets industry standards.
7.What is the process for return or replacement of MC78L05ACDX?
All MC78L05ACDX units undergo pre-shipment inspection (PSI). If there is an issue with MC78L05ACDX, 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 MC78L05ACDX part is unused and in its original packaging.
Return procedure for MC78L05ACDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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