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onsemi MC78L05ACHX
- Part No.:
- MC78L05ACHX
- Manufacturer:
- onsemi
- Package:
- TO-243AA
- Datasheet:
-
MC78L05ACHX.pdf
- Description:
- IC REG LINEAR 5V 100MA SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,341
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Product details
Overview
MC78L05ACHX from ON Semiconductor is a fixed-output +5 V, 100 mA positive linear voltage regulator in SOT-89 package, featuring thermal shutdown and short-circuit current limiting. It delivers stable 5 V output across -40°C to +125°C with ±5% tolerance and supports low-noise analog subsystems in space-constrained industrial control modules.
For engineers reviewing the MC78L05ACHX datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (1.7 V), ripple rejection (41–80 dB), load regulation (≤60 mV), and SOT-89 thermal resistance (225°C/W) for board-level thermal design validation.
Technical Context
This device implements a monolithic series-pass regulator with internal reference, error amplifier, current-limiting transistor, and thermal protection circuitry. Its architecture provides fixed 5 V output without external components, relying on input-to-output differential ≥2 V for regulation.
It operates within 7–20 V input range at 40 mA load and maintains output stability with 0.33 μF input and 0.1 μF output capacitors. The SOT-89 package enables higher power dissipation than TO-92 while retaining surface-mount compatibility for compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±5% (4.75–5.25 V over full temp/load range - ensures logic-level compatibility with 5 V TTL/CMOS) |
| Max Output Current | 100 mA (supports microcontroller peripherals, sensors, and small-signal analog stages without external boost) |
| Dropout Voltage | 1.7 V at 25°C (requires minimum 6.7 V input to sustain 5 V output under full load - constrains low-voltage battery designs) |
| Ripple Rejection | 41–80 dB at 120 Hz (attenuates rectified AC noise by >100× - critical for clean supply to ADCs and op-amps) |
| Line Regulation | 6–150 mV (input variation from 7–20 V causes ≤150 mV output shift - suitable for unregulated wall adapters) |
| Load Regulation | 5–60 mV (output shifts ≤60 mV when load changes 1–100 mA - adequate for dynamic sensor biasing) |
| Quiescent Current | 2.0–5.5 mA (low standby draw enables use in always-on monitoring nodes with minimal battery drain) |
Pinout & Package
SOT-89 package with 3-pin configuration: molded plastic body, exposed thermal pad (pin 2), and standard JEDEC TO-243 AA footprint. Pin 1 = Output, Pin 2 = Ground (thermal tab), Pin 3 = Input.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated +5 V supply node - must be decoupled with 0.1 μF capacitor placed adjacent to pin for transient response |
| 2 | Ground / Thermal Pad | Common return path and primary heat dissipation route - requires soldered thermal land area ≥25 mm² for safe 0.75 W operation |
| 3 | Input | Unregulated DC input (7–20 V) - requires 0.33 μF bypass capacitor near pin to prevent instability from source impedance |
Key Features
| Feature | Design Value |
|---|---|
| Thermal Overload Protection | Shuts down output above 150°C junction temperature - prevents permanent damage during sustained overload or poor heatsinking |
| Short-Circuit Current Limiting | Clamps output current to ~150 mA during fault - enables safe recovery after wiring errors or downstream shorts |
| ±5% Output Tolerance | Guaranteed 4.75–5.25 V at 25°C and full load - eliminates need for post-regulation trimming in cost-sensitive consumer electronics |
| Low Output Noise | 40 μV/VO (10 Hz–100 kHz) - supports noise-sensitive analog circuits like precision references and audio preamps |
| Wide Operating Temperature | -40°C to +125°C ambient range - qualified for under-hood automotive modules and industrial PLC I/O cards |
Applications
| Industrial Sensor Interface | Embedded Microcontroller Power |
|---|---|
|
Use Scenario: Powering analog-output temperature/humidity sensors in factory-floor data loggers. IC Role / Device Role / Timing Role: Provides clean, stable 5 V bias for sensor excitation and ADC reference. Use Value: 40 μV/VO noise and ±5% tolerance ensure <1 LSB error in 10-bit sensor digitization without calibration. |
Use Scenario: Supplying core logic voltage to 8-bit microcontrollers (e.g., PIC16F, ATmega328P) in remote telemetry units. IC Role / Device Role / Timing Role: Delivers regulated 5 V to MCU VDD, enabling reliable clock generation and I/O operation. Use Value: 100 mA capacity supports MCU + UART + 2x GPIO peripherals; thermal shutdown prevents latch-up during brown-out events. |
| Consumer Audio Front-End | Automotive Body Control Module |
|
Use Scenario: Biasing electret microphone preamplifiers and line-driver op-amps in portable speakers. IC Role / Device Role / Timing Role: Low-noise 5 V rail for analog signal chain - no switching artifacts corrupting audio bandwidth. Use Value: 41–80 dB ripple rejection suppresses power-supply hum; SOT-89 footprint saves board space vs. TO-92. |
Use Scenario: Powering window lift controllers and door lock actuators in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Regulates 5 V for MCU and CAN transceiver logic from noisy 12 V battery bus. Use Value: -40°C to +125°C rating meets automotive AEC-Q100 ambient requirements; 1.7 V dropout accommodates cold-cranking dips. |
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 |
|---|---|---|---|
| LM78L05ACZ | TO-92 package, RθJA = 150°C/W, same electrical specs but lower power handling (0.5 W max) | Used in through-hole prototyping or low-power legacy designs where thermal mass is sufficient | Select LM78L05ACZ only if board layout allows TO-92 mounting and peak dissipation stays below 0.5 W |
| MC78L05ACD | 8-SOIC package, RθJA = 160°C/W, identical regulation specs but different footprint and thermal path | Fits automated SMT assembly lines requiring gull-wing leads and tighter pitch than SOT-89 | Choose MC78L05ACD when leveraging existing SOIC reflow profiles and needing better lead-to-lead isolation than SOT-89 |
Compared with LM78L05ACZ and MC78L05ACD, the MC78L05ACHX offers superior thermal performance in surface-mount applications due to its exposed thermal pad - enabling 0.75 W continuous dissipation where TO-92 and SOIC variants are limited to 0.5 W and 0.6 W respectively.
Availability
MC78L05ACHX is available at Aetrix Electronics and suitable for industrial sensor interfaces, embedded microcontroller power supplies, consumer audio front-ends, and automotive body control modules requiring stable component supply with full lifecycle traceability.
Supply support for MC78L05ACHX 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, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC78LXXA series was designed as a drop-in replacement for legacy 78Lxx regulators, delivering enhanced thermal robustness and extended temperature operation for modern industrial and automotive electronics.
FAQ
What is the maximum input voltage for MC78L05ACHX?
The MC78L05ACHX supports up to 30 V input when regulating 5 V output, per absolute maximum ratings. However, for reliable operation with 100 mA load, input should not exceed 20 V to maintain safe junction temperature - exceeding this risks thermal shutdown due to 225°C/W junction-to-air resistance in SOT-89.
Does MC78L05ACHX require external capacitors?
Yes, MC78L05ACHX requires a 0.33 μF input capacitor and a 0.1 μF output capacitor for stability and transient response, as specified in the typical application circuit. Omitting either capacitor may cause oscillation or excessive output ripple, especially under dynamic load conditions.
Is MC78L05ACHX pin-compatible with LM78L05ACZ?
No, MC78L05ACHX (SOT-89) and LM78L05ACZ (TO-92) have different pinouts and packages: MC78L05ACHX uses Pin 1=Output, Pin 2=GND/Tab, Pin 3=Input; LM78L05ACZ uses Pin 1=Output, Pin 2=GND, Pin 3=Input. PCB redesign is required for substitution.
What is the thermal resistance of MC78L05ACHX?
The MC78L05ACHX has RθJA = 225°C/W (junction-to-air) and RθJC = not specified in datasheet - only RθJA is provided. This value assumes standard JEDEC test board conditions; actual performance improves with copper pour under the thermal pad.
Can MC78L05ACHX be used in automotive applications?
Yes, MC78L05ACHX is rated for -40°C to +125°C operating temperature and features thermal shutdown and short-circuit protection - making it suitable for non-safety-critical automotive body electronics such as mirror controls and interior lighting modules, though not for ASIL-B/C systems.
MC78L05ACHX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-243AA
- 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:
- SOT-89-3
MC78L05ACHX FAQ
1.How can I place an order for MC78L05ACHX through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L05ACHX 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 MC78L05ACHX reliable?
The price and inventory of MC78L05ACHX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L05ACHX is usually 5 days.
3.What payment methods are accepted for MC78L05ACHX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L05ACHX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L05ACHX?
MC78L05ACHX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L05ACHX 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 MC78L05ACHX?
For technical support, including MC78L05ACHX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L05ACHX requirements.
6.How does Aetrix verify that MC78L05ACHX is sourced from the original manufacturer or authorized distributors?
All MC78L05ACHX 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 MC78L05ACHX meets industry standards.
7.What is the process for return or replacement of MC78L05ACHX?
All MC78L05ACHX units undergo pre-shipment inspection (PSI). If there is an issue with MC78L05ACHX, 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 MC78L05ACHX part is unused and in its original packaging.
Return procedure for MC78L05ACHX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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