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onsemi MC7812ACD2TG
- Part No.:
- MC7812ACD2TG
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7812ACD2TG.pdf
- Description:
- IC REG LINEAR 12V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,511
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Product details
Overview
MC7812ACD2TG from onsemi is a fixed-output +12 V, 1.0 A linear voltage regulator in D2PAK-3 (TO-263) package, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It delivers stable output under input voltages from 14.8 V to 27 V, supports ≥1.0 A continuous load, and maintains ±2.5% output voltage tolerance over temperature and load - ideal for industrial power supplies and embedded system local regulation.
For engineers reviewing the MC7812ACD2TG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (2.0 V at 1.0 A), ripple rejection (55–60 dB at 120 Hz), quiescent current (≤6.0 mA), and thermal resistance (RθJC = 5.0 °C/W), all critical for thermally constrained 12 V rail designs.
Technical Context
The MC7812ACD2TG implements a monolithic series pass transistor architecture with built-in protection circuitry: thermal overload detection triggers shutdown before junction temperature exceeds +150 °C, while short-circuit current limiting caps peak output at 0.2 A under 35 V input. Safe-area compensation dynamically reduces short-circuit current as VIN–VOUT increases, preventing secondary breakdown.
It operates without external components for basic regulation but requires input bypassing (≥0.33 µF) when located remotely from bulk capacitance. Output stability is independent of output capacitor value, though ≥0.1 µF improves transient response - no ESR constraints apply, unlike LDOs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +12.0 V nominal, ±2.5% tolerance (11.5–12.5 V) across 5 mA–1.0 A load and −40°C to +125°C junction temperature |
| Output Current | 1.0 A continuous (with adequate heatsinking); peak current up to 2.2 A for short durations |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C - mandates minimum 14.0 V input for regulated 12 V output under full load |
| Ripple Rejection | 55 dB min at 120 Hz (15–25 V input range) - suppresses line-frequency noise from unregulated DC supplies |
| Quiescent Current | 3.4–6.0 mA - enables low-noise operation without significant standby power penalty |
| Thermal Resistance | RθJC = 5.0 °C/W - allows direct heatsink mounting to Pin 2 (GND) for efficient power dissipation |
| Protection Features | Internal thermal shutdown, short-circuit current limit (0.2 A), and safe-area compensated pass transistor |
Pinout & Package
MC7812ACD2TG uses the D2PAK-3 (TO-263) surface-mount package (Case 936), with the metal tab (heatsink surface) electrically connected to Pin 2 (Ground). This enables low-thermal-resistance mounting to PCB copper pour or external heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input terminal; must be ≥14.0 V (min) and ≤35 V (absolute max) for safe operation |
| Pin 2 | Ground | Common reference for input and output; also serves as thermal path - must be connected to large copper area or heatsink |
| Pin 3 | Output | Regulated +12 V output; capable of sourcing 1.0 A continuously with proper thermal management |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables drop-in integration into 12 V supply rails without feedback resistors, compensation networks, or sense lines |
| Internal thermal shutdown | Automatically disables output when TJ ≥ +150 °C, preventing permanent damage during overload or poor heatsinking |
| Short-circuit current limiting | Clamps output to ≤0.2 A during hard shorts, limiting power dissipation and enabling safe recovery after fault removal |
| Safe-area compensated pass transistor | Reduces short-circuit current as VIN–VOUT rises - prevents second breakdown in high-differential-voltage faults |
| 1.5% to 4% output tolerance options | MC7812ACD2TG is the ±2.5% grade ('A' suffix), balancing cost and precision for non-critical 12 V applications |
Applications
| Industrial Control Power Supply | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Providing clean +12 V bias to microcontrollers, CAN transceivers, and sensor interfaces in PLC backplanes and motor drive I/O modules. IC Role / Device Role / Timing Role: Primary local regulator converting 24 V bus to stable 12 V for logic and analog subsystems. Use Value: Thermal shutdown and short-circuit protection ensure uninterrupted operation in harsh industrial environments with variable load and fault conditions. |
Use Scenario: Powering MCU, EEPROM, and LIN transceivers in door modules and seat controllers where space and reliability are critical. IC Role / Device Role / Timing Role: Fixed 12 V regulator downstream of automotive battery (12 V nominal, 9–16 V range) with wide-input support. Use Value: RθJC = 5.0 °C/W and GND-tab thermal path enable compact layout without discrete heatsinks - meeting AEC-Q100-relevant robustness. |
| Point-of-Load Regulation for Legacy Equipment | Test & Measurement Instrumentation |
|
Use Scenario: Replacing aging 7812 variants in legacy medical devices and lab equipment requiring field-replaceable, RoHS-compliant regulators. IC Role / Device Role / Timing Role: Direct replacement for through-hole 7812 in SMT-upgraded PCBs, maintaining identical electrical behavior. Use Value: Pb-free D2PAK-3 package and onsemi's automotive-grade process ensure long-term supply continuity and compliance with modern environmental standards. |
Use Scenario: Generating low-noise 12 V for op-amp rails, ADC references, and signal conditioning stages in portable analyzers. IC Role / Device Role / Timing Role: Low-output-impedance (1.1 mΩ at 1 kHz) regulator minimizing supply-induced distortion in precision analog paths. Use Value: 10 µV/V output noise and 55+ dB ripple rejection preserve SNR in sensitive measurement front-ends without additional filtering. |
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 |
|---|---|---|---|
| LM7812CD2T | Same 12 V/1 A spec, but TI part has higher quiescent current (up to 8.0 mA) and lower ripple rejection (50 dB typ) | Less suitable for battery-powered or low-noise systems due to higher ground current and reduced AC rejection | Select LM7812CD2T only if TI supply chain alignment or legacy design reuse is prioritized over noise/efficiency |
| NCV7812BD2TR4G | Automotive-grade variant (AEC-Q100 qualified), tighter ±2% tolerance, same D2PAK-3 package and pinout | Required for automotive safety-critical modules; includes extended temp range (−40°C to +150°C) and PPAP support | Choose NCV7812BD2TR4G when automotive qualification, enhanced tolerance, or extended temperature operation is mandatory |
Compared with LM7812CD2T, MC7812ACD2TG offers lower quiescent current and superior ripple rejection; versus NCV7812BD2TR4G, it trades automotive qualification and tighter tolerance for cost-sensitive industrial use - all share identical D2PAK-3 footprint and thermal interface.
Availability
MC7812ACD2TG is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and test instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MC7812ACD2TG 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, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC7800 series - including MC7812ACD2TG - was designed for rugged, cost-effective fixed-voltage regulation in space-constrained, thermally demanding applications where simplicity, reliability, and protection integrity are paramount.
FAQ
What is the maximum input voltage rating for MC7812ACD2TG?
The absolute maximum input voltage for MC7812ACD2TG is 35 V DC, as specified in the Maximum Ratings table. Operation above this level risks permanent device failure. For reliable 12 V regulation, the recommended input range is 14.8 V to 27 V - ensuring sufficient headroom for dropout while staying within safe operating area limits.
Does MC7812ACD2TG require an input bypass capacitor?
Yes - MC7812ACD2TG requires a minimum 0.33 µF input bypass capacitor (tantalum, ceramic, or film) placed directly across Pins 1 and 2. This is essential when the regulator is located more than ~2 inches from bulk input capacitance, as it suppresses high-frequency noise and prevents oscillation under dynamic load conditions.
Can MC7812ACD2TG be used in parallel for higher current?
No - MC7812ACD2TG is not designed for parallel operation. Its output voltage tolerance (±2.5%) and lack of current-sharing circuitry mean mismatched units will cause one device to hog most of the load, leading to thermal runaway. For >1.0 A, use a single higher-current regulator or switch-mode solution instead.
What is the thermal resistance from junction to case (RθJC) for MC7812ACD2TG?
The junction-to-case thermal resistance (RθJC) for MC7812ACD2TG is 5.0 °C/W, measured from the silicon die to the metal tab (Pin 2/Ground). This value assumes direct, low-thermal-resistance contact between the tab and a heatsink or large PCB copper area - critical for sustaining 1.0 A output at elevated ambient temperatures.
Is MC7812ACD2TG compatible with lead-free reflow soldering processes?
Yes - MC7812ACD2TG is a Pb-free device rated for standard lead-free reflow profiles (JEDEC J-STD-020). Its D2PAK-3 package supports peak reflow temperatures up to 260 °C for 30 seconds, making it fully compatible with modern RoHS-compliant manufacturing lines without derating or special handling.
MC7812ACD2TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- 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):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (1kHz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-3
MC7812ACD2TG FAQ
1.How can I place an order for MC7812ACD2TG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7812ACD2TG 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 MC7812ACD2TG reliable?
The price and inventory of MC7812ACD2TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7812ACD2TG is usually 5 days.
3.What payment methods are accepted for MC7812ACD2TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7812ACD2TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7812ACD2TG?
MC7812ACD2TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7812ACD2TG 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 MC7812ACD2TG?
For technical support, including MC7812ACD2TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7812ACD2TG requirements.
6.How does Aetrix verify that MC7812ACD2TG is sourced from the original manufacturer or authorized distributors?
All MC7812ACD2TG 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 MC7812ACD2TG meets industry standards.
7.What is the process for return or replacement of MC7812ACD2TG?
All MC7812ACD2TG units undergo pre-shipment inspection (PSI). If there is an issue with MC7812ACD2TG, 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 MC7812ACD2TG part is unused and in its original packaging.
Return procedure for MC7812ACD2TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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