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onsemi MC7812ABD2TR4
- Part No.:
- MC7812ABD2TR4
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7812ABD2TR4.pdf
- Description:
- IC REG LINEAR 12V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,121
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Product details
Overview
MC7812ABD2TR4 from onsemi is a fixed-output +12 V, 1.0 A linear voltage regulator in D2PAK-3 surface-mount package, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation for robust local regulation. It delivers stable 12 V output with ±2.5% tolerance (11.5–12.5 V) across 5 mA to 1.0 A load, 14.8–27 V input, and −40°C to +125°C operating junction temperature - widely used in industrial power supplies and embedded control boards.
For engineers reviewing the MC7812ABD2TR4 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), output noise (10 µV/V), thermal resistance (RθJC = 5.0 °C/W), and compliance with automotive-grade NCV78xx family design heritage.
Technical Context
The MC7812ABD2TR4 implements a monolithic series-pass transistor architecture with built-in current-limiting circuitry that reduces short-circuit current as pass-device VCE increases, preventing secondary breakdown. Its internal safe-area compensation dynamically adjusts current limit versus voltage stress, enabling reliable operation under transient overload without external foldback components.
Thermal protection activates at +150°C junction temperature, latching off until cooldown, while quiescent current remains tightly controlled (3.4–6.0 mA) across full input range (14.8–30 V) and load (5 mA–1.0 A). Ripple rejection is optimized for 120 Hz line-frequency harmonics, with typical 60 dB attenuation at 15–25 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12.0 V nominal, 11.5–12.5 V over full load/temperature (±2.5% tolerance ensures compatibility with 12 V logic and analog rails) |
| Output Current | 1.0 A continuous (with adequate heatsinking); peak 2.2 A enables brief motor/startup surge support |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C (requires ≥14 V input for stable 12 V output under full load) |
| Ripple Rejection | 55–60 dB at 120 Hz (rejects >99.7% of AC ripple from unregulated DC supplies) |
| Quiescent Current | 3.4–6.0 mA (low standby draw preserves efficiency in always-on systems) |
| Thermal Resistance | RθJC = 5.0 °C/W (enables precise junction-temp estimation when heatsink RθSA is known) |
| Operating Temperature | Junction range −40°C to +150°C (supports industrial and automotive under-hood environments) |
Pinout & Package
D2PAK-3 (TO-263-3) thermally enhanced surface-mount package with exposed metal tab electrically connected to Pin 2 (Ground); heatsink surface must be tied to system ground for optimal thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input (14.8–27 V); requires ≥0.33 µF low-ESR bypass capacitor mounted directly at pin |
| Pin 2 | Ground | Common reference for input, output, and internal protection circuits; also connects to heatsink tab |
| Pin 3 | Output | Regulated +12 V supply; optional 0.1–1.0 µF output capacitor improves transient response (not required for stability) |
Key Features
| Feature | Design Value |
|---|---|
| Internal thermal shutdown | Activates at +150°C junction temperature and holds off until thermal recovery - eliminates need for external thermal cutoff |
| Short-circuit current limiting | Self-adjusting limit (~0.2 A) reduces with increasing VCE, preventing destructive SOA violations during sustained fault |
| Safe-area compensation | Dynamic current foldback prevents second breakdown of output transistor under high-voltage/low-current stress |
| No external components required | Stable operation with only input bypass cap (0.33 µF); no feedback resistors, compensation networks, or startup sequencing needed |
| 1.5% to 4% output tolerance options | MC7812AB variant offers ±2.5% (11.5–12.5 V) tolerance - tighter than standard C-grade (±5%) for precision 12 V rail applications |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Local 12 V regulation for microcontroller, CAN transceiver, and sensor interface ICs on a DIN-rail mounted PLC backplane. IC Role / Device Role / Timing Role: Primary post-filter regulator delivering clean, protected 12 V to mixed-signal subsystems. Use Value: Internal short-circuit and thermal protection eliminate need for fuse coordination or discrete crowbar circuits, reducing BOM count and board area. |
Use Scenario: Powering door module MCU and window motor driver ICs in 12 V vehicle electrical architecture. IC Role / Device Role / Timing Role: Fixed-voltage LDO replacement for legacy discrete regulators in AEC-Q100-compliant designs. Use Value: D2PAK-3 package provides low RθJC (5.0 °C/W) and robust thermal coupling to chassis ground - critical for under-dash temperature cycling. |
| Test Equipment Front-End Supply | Legacy Industrial Instrumentation |
|
Use Scenario: Providing stable 12 V bias to op-amps and ADC drivers in portable multimeters and signal analyzers. IC Role / Device Role / Timing Role: Low-noise (10 µV/V), low-drift (−0.8 mV/°C) voltage source for analog signal conditioning stages. Use Value: Ripple rejection ≥55 dB at 120 Hz suppresses mains-borne noise before sensitive measurement circuitry, improving ENOB. |
Use Scenario: Retrofitting obsolete 7812-style regulators in aging factory-floor controllers and HMI panels. IC Role / Device Role / Timing Role: Direct drop-in replacement for through-hole TO-220 7812 variants using adapter footprint or rework. Use Value: Same electrical specs and pinout (Input-GND-Output) as legacy parts - enables field upgrades without PCB redesign. |
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/NOPB (TI) | ±2% output tolerance (11.76–12.24 V); higher quiescent current (4.2–8.0 mA); RθJC = 3.5 °C/W | Preferred where tighter initial accuracy is critical; lower thermal resistance supports higher ambient temps without heatsink | Select when absolute output accuracy and minimal thermal margin dominate over cost and legacy compatibility |
| NCV7812BD2TR4G (onsemi) | Automotive-grade AEC-Q100 qualified; same electrical specs but enhanced process control and PPAP documentation | Required for OEM automotive body electronics; supports extended temperature (−40°C to +150°C) and zero-defect manufacturing requirements | Choose for new automotive designs or where long-term supply assurance and qualification traceability are mandatory |
Compared with LM7812CD2T/NOPB, MC7812ABD2TR4 offers wider tolerance but lower quiescent current and proven industrial reliability; versus NCV7812BD2TR4G, it lacks AEC-Q100 certification but shares identical electrical behavior and pinout - ideal for cost-sensitive non-automotive applications.
Availability
MC7812ABD2TR4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MC7812ABD2TR4 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications - focused on enabling sustainable technology.
The MC7800 series was designed as a rugged, drop-in fixed-voltage regulator family for local board-level power conversion, emphasizing thermal resilience, fault tolerance, and broad input-range operation in harsh environments.
FAQ
What is the maximum input voltage rating for MC7812ABD2TR4?
The absolute maximum input voltage for MC7812ABD2TR4 is 35 V DC, per the datasheet's "Maximum Ratings" table. However, for reliable continuous operation, input should remain within 14.8–27 V to maintain regulation and avoid excessive power dissipation - exceeding 27 V significantly increases thermal stress even at light loads.
Does MC7812ABD2TR4 require an input bypass capacitor?
Yes, MC7812ABD2TR4 requires a minimum 0.33 µF low-ESR capacitor (e.g., tantalum or ceramic) placed directly across Pins 1 and 2. This stabilizes high-frequency impedance and prevents oscillation when input traces are long or source impedance is high - omission risks instability and output ripple amplification.
Can MC7812ABD2TR4 be used in parallel for higher current?
No, MC7812ABD2TR4 is not designed for direct parallel operation due to mismatched output voltages causing current hogging. For >1.0 A, use a single higher-current regulator (e.g., MC7812ACT) or implement external current-sharing circuitry - paralleling without ballasting resistors risks thermal runaway.
What is the thermal shutdown behavior of MC7812ABD2TR4?
MC7812ABD2TR4 features latch-off thermal shutdown: when junction temperature reaches +150°C, the output disables completely and remains off until junction cools below ~135°C. This protects against sustained overloads but requires thermal design to ensure sufficient cooldown time between faults.
Is MC7812ABD2TR4 pin-compatible with older TO-220 7812 regulators?
Yes, MC7812ABD2TR4 uses the same Input-Ground-Output pinout as TO-220 7812 devices (e.g., MC7812CT), enabling direct replacement on adapter boards or with footprint conversion. The D2PAK-3 package has identical terminal numbering and functional mapping - only mechanical mounting differs.
MC7812ABD2TR4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- 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):
- 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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-3
MC7812ABD2TR4 FAQ
1.How can I place an order for MC7812ABD2TR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7812ABD2TR4 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 MC7812ABD2TR4 reliable?
The price and inventory of MC7812ABD2TR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7812ABD2TR4 is usually 5 days.
3.What payment methods are accepted for MC7812ABD2TR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7812ABD2TR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7812ABD2TR4?
MC7812ABD2TR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7812ABD2TR4 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 MC7812ABD2TR4?
For technical support, including MC7812ABD2TR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7812ABD2TR4 requirements.
6.How does Aetrix verify that MC7812ABD2TR4 is sourced from the original manufacturer or authorized distributors?
All MC7812ABD2TR4 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 MC7812ABD2TR4 meets industry standards.
7.What is the process for return or replacement of MC7812ABD2TR4?
All MC7812ABD2TR4 units undergo pre-shipment inspection (PSI). If there is an issue with MC7812ABD2TR4, 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 MC7812ABD2TR4 part is unused and in its original packaging.
Return procedure for MC7812ABD2TR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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