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onsemi MC78L12ACDR2
- Part No.:
- MC78L12ACDR2
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC78L12ACDR2.pdf
- Description:
- IC REG LINEAR 12V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,620
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Product details
Overview
MC78L12ACDR2 from onsemi is a 12 V, 100 mA fixed-output 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 for low-power analog and digital subsystems in industrial control panels, sensor signal conditioning circuits, and embedded microcontroller power rails.
For engineers reviewing the MC78L12ACDR2 datasheet, pinout, applications, or equivalent options, key selection criteria include output voltage tolerance (±4.2% at +25°C), dropout voltage (1.7 V typical), thermal resistance (RJA per Figure 8), and SOIC-8 lead-frame thermal enhancement for improved power dissipation.
Technical Context
The MC78L12ACDR2 implements a monolithic series-pass transistor regulator with built-in protection circuitry: thermal overload shutdown activates at ~150°C junction temperature, and internal current limiting restricts output to ≤100 mA under short-circuit conditions. Its architecture eliminates need for external compensation capacitors in most applications.
It operates across 0°C to +125°C junction temperature range with input voltage support up to 35 V (for 12 V output), maintaining regulation as long as input remains ≥13.7 V (12 V + 1.7 V dropout). Ripple rejection is 42 dB typical at 120 Hz with 15–25 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12 V nominal, 11.4–12.6 V over full operating range - ensures compatibility with 12 V logic and analog ICs requiring tight supply tolerance |
| Max Output Current | 100 mA - sufficient for powering small microcontrollers, op-amps, or sensors without external pass devices |
| Dropout Voltage | 1.7 V typical at +25°C - enables operation from 13.7 V minimum input, reducing heat generation vs. higher-dropout regulators |
| Line Regulation | 100 mV max (14.5–27 V input) - limits output variation due to input ripple or supply drift in unregulated DC sources |
| Load Regulation | 10 mV max (1–40 mA load) - maintains stable voltage across varying load currents typical of mixed-signal systems |
| Ripple Rejection | 42 dB typical at 120 Hz - suppresses AC ripple from rectified supplies, critical for noise-sensitive analog stages |
| Quiescent Current | 4.2 mA typical at +25°C - enables low standby power in battery-backed or energy-conscious designs |
Pinout & Package
MC78L12ACDR2 uses an internally modified SOIC-8 (Case 751) package where pins 2, 3, 6, and 7 are electrically common to the die attach flag - this reduces thermal resistance and improves power dissipation when mounted on adequate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated 12 V output node; requires local 0.1 µF ceramic capacitor for transient response improvement |
| 2 | Ground | Common reference for input and output; electrically tied to die flag and pins 3/6/7 for enhanced thermal conduction |
| 3 | Ground | Secondary ground connection sharing same internal node as pin 2 - improves current handling and thermal path |
| 4 | Input | Unregulated DC input (min 13.7 V, max 35 V); requires 0.33 µF bypass capacitor if >10 cm from filter |
| 5 | Ground | Third ground terminal tied to die flag - lowers effective thermal resistance when all ground pins are soldered to large copper pour |
| 6 | Ground | Fourth ground connection, identical to pins 2/3/5 - enables robust grounding in high-noise environments |
| 7 | Ground | Fifth ground terminal, part of shared die-flag node - maximizes heat transfer to PCB when used with thermal pad layout |
| 8 | Ground | Sixth ground pin completing the internal flag connection - supports thermal design targeting <55°C/W RJA |
Key Features
| Feature | Design Value |
|---|---|
| Internal thermal shutdown | Protects against sustained overload by disabling output above ~150°C junction temperature - eliminates need for external thermal monitoring |
| Short-circuit current limiting | Clamps output to ≤100 mA during fault - prevents damage to regulator and upstream supply under wiring faults or board shorts |
| No external compensation required | Stable with only input/output bypass capacitors - simplifies layout and reduces BOM count in space-constrained designs |
| Pb-free SOIC-8 package | RoHS-compliant construction with enhanced thermal performance via internal lead-frame modification - supports automated assembly and thermal reliability |
| Wide input voltage range | Supports 14.5–27 V input for 12 V output - accommodates 15–24 V industrial supplies with margin for ripple and drop |
Applications
| Industrial Sensor Interface | Microcontroller Power Supply |
|---|---|
Use Scenario: Powering 4–20 mA transmitter circuits and precision op-amps in factory-floor temperature/pressure sensors. IC Role / Device Role / Timing Role: Provides clean, low-noise 12 V rail for analog front-end amplification and DAC reference buffers. Use Value: 42 dB ripple rejection and 10 mV load regulation ensure <0.1% output error across sensor load variations and supply ripple. | Use Scenario: Supplying 12 V to 8-bit microcontrollers (e.g., PIC16F, STM8) and associated I/O peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Primary local regulator converting 24 V field bus to MCU core voltage; handles dynamic current bursts during wake-up or communication. Use Value: 100 mA rating and 1.7 V dropout allow direct use of 24 V supply with minimal heat sink - simplifying power tree design. |
| Legacy Equipment Retrofit | Low-Power Analog Instrumentation |
Use Scenario: Replacing aging 78L12 zener-resistor supplies in discontinued test equipment with modern RoHS-compliant solution. IC Role / Device Role / Timing Role: Drop-in functional replacement delivering tighter output tolerance and integrated protection vs. discrete alternatives. Use Value: Identical pinout to legacy TO-92 versions (when using adapter) and guaranteed 11.4–12.6 V output eliminates recalibration of analog circuitry. | Use Scenario: Biasing low-noise instrumentation amplifiers and ADC reference circuits in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Ultra-stable voltage source minimizing offset drift and quantization noise in precision measurement paths. Use Value: 80 µV RMS output noise (10 Hz–100 kHz) and <0.5% line/load regulation preserve measurement accuracy to 12-bit resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78L12ACPREG | TO-92 package, same electrical specs, 0°C to +125°C temp range, 2000/reel tape-and-reel | Lower power dissipation (RJA = 200°C/W vs. SOIC-8's ~100°C/W), suited for <50 mW continuous loads | Select for cost-sensitive, low-power, through-hole assembly where thermal budget allows |
| TL78L12ACDR | Texas Instruments variant: ±5% output tolerance (vs. ±4.2%), 1.8 V dropout, 50 mA max output | Lower current capability and looser voltage spec - suitable only for ultra-low-power analog biasing | Choose only when TI sourcing preference exists and 50 mA/±5% meets system requirements |
Compared with MC78L12ACPREG and TL78L12ACDR, the MC78L12ACDR2 offers superior thermal performance in surface-mount format and tighter output voltage tolerance - making it optimal for higher-current, space-constrained, or precision-regulation applications.
Availability
MC78L12ACDR2 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller power supplies, and legacy equipment retrofits requiring stable component supply, RoHS compliance, and SOIC-8 thermal performance.
Supply support for MC78L12ACDR2 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 as a cost-effective, rugged fixed-voltage linear regulator family for general-purpose analog and digital power needs - emphasizing simplicity, reliability, and broad temperature operation without external components.
FAQ
What is the maximum input voltage for MC78L12ACDR2?
The absolute maximum input voltage for MC78L12ACDR2 is 35 V DC, as specified in the Absolute Maximum Ratings table for 12 V output variants. Operation above this level risks permanent damage. For reliable regulation, input must remain ≥13.7 V (12 V + 1.7 V dropout) and within 14.5–27 V for tested line regulation performance. Always observe derating curves in Figure 7 for ambient temperature effects on safe operating area.
Does MC78L12ACDR2 require input and output capacitors?
MC78L12ACDR2 does not require external capacitors for stability, but input bypass (0.33 µF tantalum or ceramic) is recommended when traces exceed 10 cm from the power filter, and output capacitance (0.1 µF ceramic) improves transient response. These values are validated in the datasheet's standard application circuit (Figure 2) and do not affect regulation integrity - omission may degrade ripple rejection and load-step recovery in noisy or dynamic systems.
What is the thermal resistance (RJA) of MC78L12ACDR2 in SOIC-8 package?
The thermal resistance RJA for MC78L12ACDR2 is not a fixed value but depends on PCB copper area - Figure 8 shows RJA ranging from ~100°C/W (with 30 mm × 30 mm 2-oz copper) down to ~55°C/W (with optimized thermal pad layout). Unlike TO-92 (RJA = 200°C/W), the SOIC-8's internal lead-frame modification ties pins 2/3/6/7 to the die flag, enabling significantly better heat transfer when all ground pins connect to a large copper pour.
Is MC78L12ACDR2 pin-compatible with older 78L12 variants?
MC78L12ACDR2 is not pin-compatible with TO-92-packaged 78L12 variants (e.g., MC78L12ACPG) due to its 8-pin SOIC footprint. However, it shares identical pin functions (Input, Output, Ground) mapped to pins 4, 1, and 2/3/5/6/7 respectively - enabling adapter-based drop-in replacement in legacy designs. The SOIC-8's multi-ground configuration improves thermal and EMI performance but requires PCB layout revision for direct substitution.
What protection features does MC78L12ACDR2 include?
MC78L12ACDR2 integrates two key protection features: (1) internal short-circuit current limiting that caps output at ~100 mA during faults, and (2) thermal shutdown that disables regulation when junction temperature exceeds ~150°C. Both functions are fully self-contained - no external components needed. These protections are characterized across the full 0°C to +125°C operating range and restore automatically upon fault removal and cooldown.
MC78L12ACDR2 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):
- 35V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 6.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 42dB (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
MC78L12ACDR2 FAQ
1.How can I place an order for MC78L12ACDR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78L12ACDR2 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 MC78L12ACDR2 reliable?
The price and inventory of MC78L12ACDR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78L12ACDR2 is usually 5 days.
3.What payment methods are accepted for MC78L12ACDR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78L12ACDR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78L12ACDR2?
MC78L12ACDR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78L12ACDR2 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 MC78L12ACDR2?
For technical support, including MC78L12ACDR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78L12ACDR2 requirements.
6.How does Aetrix verify that MC78L12ACDR2 is sourced from the original manufacturer or authorized distributors?
All MC78L12ACDR2 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 MC78L12ACDR2 meets industry standards.
7.What is the process for return or replacement of MC78L12ACDR2?
All MC78L12ACDR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC78L12ACDR2, 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 MC78L12ACDR2 part is unused and in its original packaging.
Return procedure for MC78L12ACDR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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