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onsemi MC78L08ACDR2
- Part No.:
- MC78L08ACDR2
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC78L08ACDR2.pdf
- Description:
- IC REG LINEAR 8V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,829
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Product details
Overview
MC78L08ACDR2 from onsemi is a fixed-output +8.0 V, 100 mA positive linear voltage regulator in SOIC-8 package with internal short-circuit and thermal overload protection. It operates over 0°C to +125°C junction temperature, requires no external components for basic regulation, and delivers stable output with 7.7–8.3 V tolerance at +25°C. It is widely used in low-power industrial control, sensor signal conditioning, and embedded microcontroller power rails.
For engineers reviewing the MC78L08ACDR2 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (1.7 V typ), load regulation (8.0 mV max at ≤40 mA), ripple rejection (57 dB typ), thermal resistance (RJA per PCB copper area), and SOIC-8 lead-frame thermal enhancement for improved power dissipation.
Technical Context
The MC78L08ACDR2 implements a monolithic series-pass transistor architecture with built-in current limiting and thermal shutdown circuitry. Its internal reference and error amplifier maintain output regulation across line (10.5–23 V input) and load (1–100 mA) variations without requiring external compensation.
It features a fixed 8.0 V output set by internal resistor networks, with dropout defined as the minimum VI–VO differential (1.7 V typ) required to sustain regulation. Input bias current remains stable across temperature (3.0–6.0 mA) and exhibits minimal change (<1.5 mA) over input voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 7.7–8.3 V at +25°C; ensures ±3.75% accuracy for 8 V rail integrity in noise-sensitive analog circuits |
| Max Output Current | 100 mA; supports low-power MCU cores, op-amps, and digital logic without external pass devices |
| Dropout Voltage | 1.7 V typical; enables operation from 9.7 V min input, reducing heat dissipation vs. higher-dropout regulators |
| Ripple Rejection | 57 dB typical at 120 Hz; suppresses AC ripple from unregulated DC supplies feeding sensitive analog stages |
| Load Regulation | 8.0 mV max (1–40 mA); maintains tight voltage stability under dynamic load changes in sensor interfaces |
| Thermal Resistance | RJA varies with PCB copper area (see Fig. 8); SOIC-8 package achieves lower θJA than TO-92 when mounted on ≥3 mm copper traces |
| Operating Temp | 0°C to +125°C junction; suitable for non-automotive industrial environments without derating |
Pinout & Package
MC78L08ACDR2 uses an SOIC-8 (Case 751) package with internally modified lead frame: pins 2, 3, 6, and 7 are electrically common to the die attach flag, lowering thermal resistance and enabling higher power dissipation on properly designed PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOUT | Regulated +8.0 V output; connects directly to load and local bypass capacitor (0.1 µF) |
| 2 | GND | Common ground reference; tied to die flag for enhanced thermal conduction in SOIC-8 |
| 3 | GND | Second ground terminal; electrically common with pin 2 and die flag for low-impedance return path |
| 4 | VIN | Unregulated input (min 9.7 V); requires 0.33 µF input bypass capacitor if >5 cm from filter |
| 5 | GND | Third ground terminal; provides additional ground routing flexibility and reduces ground loop impedance |
| 6 | GND | Fourth ground terminal; shares die flag connection to maximize thermal and electrical grounding |
| 7 | NC | No connect; not bonded internally; must remain unconnected per design |
| 8 | NC | No connect; not bonded internally; must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +8.0 V output | Eliminates external resistor network, reducing BOM count and layout complexity in space-constrained designs |
| Internal thermal shutdown | Prevents catastrophic failure during sustained overload or poor heatsinking-no external thermal sensor needed |
| SOIC-8 thermal enhancement | Pins 2/3/6/7 tied to die flag reduce RJA significantly vs. standard SOIC-8, enabling higher continuous current at ambient temp |
| No external capacitors required | Stable operation without compensation components simplifies design for cost-sensitive consumer and industrial applications |
| Pb-free, RoHS-compliant | Meets global environmental compliance requirements without impacting thermal or electrical performance |
Applications
| Industrial Sensor Interface | Microcontroller Power Supply |
|---|---|
Use Scenario: Powering analog-output temperature/humidity sensors in factory automation nodes. IC Role / Device Role / Timing Role: Provides clean, stable +8.0 V bias for sensor excitation and ADC reference scaling. Use Value: Low output noise (60 µV RMS) and high ripple rejection (57 dB) prevent measurement drift caused by supply coupling. | Use Scenario: Supplying 8 V rail to legacy 8-bit microcontrollers with integrated 8 V I/O buffers. IC Role / Device Role / Timing Role: Delivers regulated voltage to MCU VDD and peripheral I/O banks with minimal external parts. Use Value: 100 mA output and 8.0 mV load regulation ensure stable operation during GPIO switching transients. |
| Low-Power Analog Front-End | Legacy Industrial Control Module |
Use Scenario: Biasing op-amps and precision voltage references in battery-backed data loggers. IC Role / Device Role / Timing Role: Serves as primary analog supply rail decoupled from noisy digital domains. Use Value: Fixed 8 V output eliminates need for trimming; 1.7 V dropout extends usable battery life in 9–12 V systems. | Use Scenario: Replacing aging discrete Zener-resistor regulators in PLC I/O modules. IC Role / Device Role / Timing Role: Direct drop-in replacement for obsolete 8 V linear regulators with identical pin-compatible SOIC-8 footprint. Use Value: Internal current limiting and thermal protection improve field reliability vs. passive solutions. |
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 |
|---|---|---|---|
| MC78L08ACPG | TO-92 package; higher RJA (200°C/W); 2000-unit bag packaging | Suitable for prototyping or low-volume through-hole assembly; limited power dissipation at elevated ambient temps | Select when manual soldering, breadboarding, or legacy through-hole PCBs require compatibility |
| MC78L08ACPRAG | TO-92 in tape-and-reel; same thermal specs as MC78L08ACPG | Enables automated pick-and-place for TO-92; lacks SOIC-8's thermal advantage but offers reel-based SMT handling | Choose for high-mix SMT lines needing TO-92 form factor with automated feeding |
Compared with MC78L08ACPG and MC78L08ACPRAG, the MC78L08ACDR2 offers superior thermal performance via SOIC-8's die-flag grounding, enabling higher continuous current in compact industrial PCBs-critical where board space and thermal management are constrained.
Availability
MC78L08ACDR2 is available at Aetrix Electronics and suitable for industrial sensor interface, microcontroller power supply, low-power analog front-end, and legacy industrial control module applications requiring stable component supply and long-term manufacturability.
Supply support for MC78L08ACDR2 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 replace inefficient Zener-diode/resistor regulators in cost-sensitive, low-current applications-delivering tighter regulation, lower quiescent current, and integrated protection in standardized packages.
FAQ
What is the maximum input voltage rating for MC78L08ACDR2?
The absolute maximum input voltage for MC78L08ACDR2 is 35 Vdc for 12–18 V-rated variants. Per the datasheet's Absolute Maximum Ratings table, it supports up to 35 Vdc input when specified for 12–18 V operation-ensuring safe operation in transient-prone industrial 24 V systems where input spikes may exceed nominal rails.
Does MC78L08ACDR2 require input and output capacitors for stability?
MC78L08ACDR2 does not require external capacitors for basic stability, but the datasheet recommends a 0.33 µF input capacitor if the regulator is located >5 cm from the power supply filter, and a 0.1 µF output capacitor to improve transient response. These values are validated in the Standard Application schematic (Figure 2) and do not affect inherent stability.
What is the thermal resistance (RJA) of MC78L08ACDR2 in SOIC-8 package?
MC78L08ACDR2's RJA is not fixed-it depends on PCB copper area per Figure 8. With 3 mm × 3 mm copper pad, RJA drops to ~120°C/W; with 10 mm × 10 mm, it reaches ~60°C/W. The SOIC-8's internal lead-frame modification (pins 2/3/6/7 tied to die flag) enables this scalable thermal performance, unlike standard SOIC-8 packages.
Can MC78L08ACDR2 be used as a current source?
Yes-MC78L08ACDR2 can be configured as a constant-current source per Figure 9 in the datasheet. By connecting the output to a grounded load through a series resistor (R), current equals (8.0 V + IIB)/R. For example, R = 80 Ω yields ~100 mA, leveraging the regulator's internal current limit and thermal protection for robust operation.
Is MC78L08ACDR2 pin-compatible with other MC78L00A Series SOIC-8 variants?
Yes-MC78L08ACDR2 shares identical SOIC-8 pinout (D Suffix, Case 751) and pin function mapping with all MC78LxxACDR2G variants (e.g., MC78L05ACDR2G, MC78L12ACDR2G). Pin 1 = VOUT, pins 2/3/5/6 = GND, pin 4 = VIN, pins 7/8 = NC-enabling direct substitution within the same output voltage family when board layout permits.
MC78L08ACDR2 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):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 57dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MC78L08ACDR2 FAQ
1.How can I place an order for MC78L08ACDR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L08ACDR2 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 MC78L08ACDR2 reliable?
The price and inventory of MC78L08ACDR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L08ACDR2 is usually 5 days.
3.What payment methods are accepted for MC78L08ACDR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L08ACDR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L08ACDR2?
MC78L08ACDR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L08ACDR2 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 MC78L08ACDR2?
For technical support, including MC78L08ACDR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L08ACDR2 requirements.
6.How does Aetrix verify that MC78L08ACDR2 is sourced from the original manufacturer or authorized distributors?
All MC78L08ACDR2 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 MC78L08ACDR2 meets industry standards.
7.What is the process for return or replacement of MC78L08ACDR2?
All MC78L08ACDR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC78L08ACDR2, 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 MC78L08ACDR2 part is unused and in its original packaging.
Return procedure for MC78L08ACDR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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