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onsemi MC7812CD2TR4
- Part No.:
- MC7812CD2TR4
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7812CD2TR4.pdf
- Description:
- IC REG LINEAR 12V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,512
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Product details
Overview
MC7812CD2TR4 from onsemi is a fixed +12 V, 1.0 A positive linear voltage regulator in D2PAK-3 surface-mount package. It features internal thermal shutdown, short-circuit current limiting, safe-area compensation, ±4% output voltage tolerance at 25°C, and 2.0 V dropout at 1.0 A - designed for local on-card regulation in industrial power supplies and embedded control systems.
For engineers reviewing the MC7812CD2TR4 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal performance data, real-world design constraints (e.g., minimum 14.5 V input for stable 12 V output), and validated alternative parts with documented functional trade-offs.
Technical Context
The MC7812CD2TR4 implements a monolithic series pass transistor architecture with built-in protection circuitry: thermal overload detection triggers shutdown above +150°C junction temperature, while short-circuit current limiting holds peak output at 0.2 A under 35 V input. Safe-area compensation dynamically reduces short-circuit current as VCE increases, preventing second breakdown.
It operates without external components for basic regulation but requires ≥0.33 µF input bypass capacitor when located >5 cm from bulk filter. Output stability is independent of output capacitance, though ≥0.1 µF improves transient response. Ripple rejection is 60 dB at 120 Hz with 15 V input and 500 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +12.0 V nominal, ±4% tolerance at 25°C - ensures compatibility with 12 V logic and analog rails requiring ±0.48 V margin |
| Output Current | 1.0 A continuous, 2.2 A peak - supports moderate-power microcontrollers, sensors, and interface ICs without heatsink below 5 W dissipation |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C - mandates minimum 14.5 V input under full load to sustain regulated 12 V output |
| Ripple Rejection | 60 dB at 120 Hz, 15 V input, 500 mA load - suppresses line-frequency noise from unregulated DC supplies |
| Quiescent Current | 3.4–6.0 mA - contributes <0.1 W loss at 12 V output, critical for low-standby-power designs |
| Thermal Shutdown | Activates at +150°C junction temperature - protects against sustained overloads or inadequate heatsinking |
| Short-Circuit Limit | 0.2 A at 35 V input - limits fault energy during output shorts, enabling safe auto-recovery after fault removal |
Pinout & Package
D2PAK-3 (TO-263-3) thermally enhanced surface-mount package with exposed metal tab electrically connected to Pin 2 (Ground). Requires solder pad thermal relief and ≥1 in² copper area for 65°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Unregulated DC input; must exceed 14.5 V under 1.0 A load to maintain regulation |
| 2 | Ground | Common reference for input, output, and heatsink; connects to exposed tab for thermal conduction |
| 3 | Output | Stable +12 V supply; no output capacitor required for stability, but ≥0.1 µF improves load transients |
Key Features
| Feature | Design Value |
|---|---|
| No external components needed | Enables single-chip 12 V regulation - eliminates BOM cost and layout space for feedback resistors or compensation networks |
| Internal thermal shutdown | Prevents permanent damage during sustained overloads or ambient temperature excursions beyond design limits |
| Safe-area compensated output transistor | Automatically derates short-circuit current as VCE rises - avoids destructive second breakdown during fault conditions |
| 1.0 A continuous output current | Supports direct powering of multiple peripherals (e.g., RS-485 transceivers, op-amps, small solenoids) without external pass devices |
| ±4% output voltage tolerance | Meets industrial-grade accuracy requirements for non-critical 12 V rails where tight regulation is not mandatory |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering digital isolators, optocouplers, and level-shifting buffers in 24 V-powered programmable logic controller backplanes. IC Role / Device Role / Timing Role: Local +12 V rail generator for signal conditioning circuitry, decoupling noise from main 24 V bus. Use Value: Eliminates need for isolated DC-DC converters; leverages inherent ripple rejection (60 dB @ 120 Hz) to suppress switching noise from upstream SMPS. |
Use Scenario: Supplying microcontroller peripherals (CAN transceivers, LIN drivers, sensor interfaces) in body electronics modules. IC Role / Device Role / Timing Role: Secondary regulated rail derived from vehicle battery (9–16 V), providing stable 12 V despite cold-crank dips. Use Value: Internal short-circuit protection (0.2 A limit) prevents fuse blowing during wiring faults; thermal shutdown avoids latch-up in sealed enclosures. |
| Point-of-Sale Terminal Power | Test & Measurement Equipment |
|
Use Scenario: Generating clean +12 V for thermal print head drivers and barcode scanner lasers in retail kiosks. IC Role / Device Role / Timing Role: Low-noise analog/actuator supply isolated from noisy digital processor rails via separate LDO stage. Use Value: 10 µV/V output noise (10 Hz–100 kHz) minimizes laser current ripple; 1.1 mΩ output impedance ensures stable voltage under pulsed loads. |
Use Scenario: Biasing precision op-amps and ADC reference buffers in benchtop multimeters and signal analyzers. IC Role / Device Role / Timing Role: Low-drift auxiliary supply for analog front-end circuitry requiring stable headroom above ground. Use Value: −0.8 mV/°C temperature coefficient maintains <±5 mV drift over 0–70°C operating range; no external trimming required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-voltage linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7812CD2T | Same +12 V output, 1.0 A rating, TO-263 package; ±2% tolerance (tighter than MC7812CD2TR4's ±4%), higher quiescent current (4.5–8.0 mA) | Better initial accuracy suits precision analog rails; higher IB increases standby power in battery-backed systems | Select LM7812CD2T when ±2% output tolerance is mandatory and thermal margin allows higher IB |
| NCV7812BD2TR4 | Automotive-grade variant: AEC-Q100 qualified, −40°C to +125°C operation, ±2% tolerance, same D2PAK-3 package | Required for automotive body electronics; wider temp range and tighter tolerance increase cost vs. industrial MC7812CD2TR4 | Choose NCV7812BD2TR4 for automotive OEM designs needing PPAP support and extended temperature compliance |
Compared with LM7812CD2T and NCV7812BD2TR4, the MC7812CD2TR4 offers lower cost and adequate ±4% tolerance for non-automotive industrial use, while retaining identical D2PAK-3 footprint and thermal performance - making it optimal for cost-sensitive, non-automotive 12 V regulation where tighter accuracy isn't required.
Availability
MC7812CD2TR4 is available at Aetrix Electronics and suitable for industrial control systems, test equipment power supplies, and embedded computing platforms requiring stable component supply and long-term manufacturability.
Supply support for MC7812CD2TR4 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.
The MC7800 series was engineered as cost-optimized, robust fixed-output linear regulators for local on-card power conversion - prioritizing reliability, integrated protection, and ease of use over ultra-low quiescent current or adjustable functionality.
FAQ
What is the minimum input voltage required for MC7812CD2TR4 to maintain regulation at full 1.0 A load?
The MC7812CD2TR4 requires a minimum input voltage of 14.5 V under 1.0 A load and 25°C junction temperature to sustain regulated +12 V output, based on its 2.0 V dropout specification. At higher temperatures or with reduced load, the required headroom decreases slightly due to lower dropout voltage drift.
Does MC7812CD2TR4 require an output capacitor for stability?
No, the MC7812CD2TR4 is internally compensated and does not require an output capacitor for stability. However, adding ≥0.1 µF ceramic or tantalum capacitor at the output significantly improves transient response to step-load changes, especially in systems with high di/dt loads like digital ICs.
Can MC7812CD2TR4 be used in automotive applications?
The standard MC7812CD2TR4 is rated for 0°C to +125°C operation and meets industrial requirements, but it is not AEC-Q100 qualified. For automotive applications, use the NCV7812BD2TR4 - the automotive-grade variant with PPAP capability, −40°C to +125°C range, and tighter ±2% output tolerance.
How does thermal shutdown work in MC7812CD2TR4?
The MC7812CD2TR4 integrates a thermal sensing circuit that disables the pass transistor when junction temperature exceeds +150°C. Operation resumes automatically once the die cools below the hysteresis threshold (~140°C), providing self-protecting behavior during sustained overloads or insufficient heatsinking.
What is the maximum power dissipation capability of MC7812CD2TR4 in D2PAK-3 package?
With proper PCB copper area (≥1 in²), the MC7812CD2TR4 achieves a junction-to-ambient thermal resistance of 65°C/W. At 25°C ambient, this allows ~1.9 W continuous dissipation before reaching +150°C junction limit - corresponding to ~158 mA at 12 V output with 24 V input (12 V differential).
MC7812CD2TR4 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):
- 6.5 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
MC7812CD2TR4 FAQ
1.How can I place an order for MC7812CD2TR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7812CD2TR4 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 MC7812CD2TR4 reliable?
The price and inventory of MC7812CD2TR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7812CD2TR4 is usually 5 days.
3.What payment methods are accepted for MC7812CD2TR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7812CD2TR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7812CD2TR4?
MC7812CD2TR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7812CD2TR4 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 MC7812CD2TR4?
For technical support, including MC7812CD2TR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7812CD2TR4 requirements.
6.How does Aetrix verify that MC7812CD2TR4 is sourced from the original manufacturer or authorized distributors?
All MC7812CD2TR4 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 MC7812CD2TR4 meets industry standards.
7.What is the process for return or replacement of MC7812CD2TR4?
All MC7812CD2TR4 units undergo pre-shipment inspection (PSI). If there is an issue with MC7812CD2TR4, 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 MC7812CD2TR4 part is unused and in its original packaging.
Return procedure for MC7812CD2TR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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