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onsemi MC7812BD2TR4
- Part No.:
- MC7812BD2TR4
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7812BD2TR4.pdf
- Description:
- IC REG LINEAR 12V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,055
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Product details
Overview
MC7812BD2TR4 from onsemi is a fixed +12 V, 1.0 A positive linear voltage regulator in D2PAK-3 surface-mount package, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It delivers stable output under input voltages up to 35 V and supports local on-card regulation in industrial power supplies and embedded control systems.
For engineers reviewing the MC7812BD2TR4 datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal behavior, PCB layout guidance for heatsinking, and validated alternative parts for design continuity and supply chain resilience.
Technical Context
The MC7812BD2TR4 employs a monolithic bipolar pass transistor with integrated protection circuitry, including foldback current limiting that reduces short-circuit current as pass-device voltage increases. Its dropout voltage remains fixed at 2.0 V (at 1.0 A, TJ = 25°C), enabling reliable operation with ≥14.8 V minimum input across temperature.
Designed for fixed-output use without external components, it achieves ±1.5% output voltage tolerance at 25°C (11.75–12.25 V), with line regulation ≤3.8 mV and load regulation ≤25 mV over full operating conditions. Ripple rejection reaches 55 dB at 120 Hz, supporting clean DC in noisy AC/DC front-end environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +12.0 V nominal, 11.75–12.25 V at TJ = 25°C (±1.5% tolerance) |
| Output Current | 1.0 A continuous, 2.2 A peak - sufficient for powering microcontrollers, sensors, and analog circuitry |
| Input Voltage Range | 14.8 V to 30 V DC - requires ≥2.0 V headroom above output for regulation |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C - determines minimum viable input for stable 12 V output |
| Ripple Rejection | 55 dB at 120 Hz - suppresses rectified AC ripple in unregulated DC bus applications |
| Thermal Resistance | Junction-to-case: 5.0 °C/W - mandates direct heatsink contact via Pin 2 (GND) for >0.5 A operation |
| Quiescent Current | 3.4–6.0 mA - low standby draw suitable for always-on industrial modules |
Pinout & Package
D2PAK-3 (Case 936) surface-mount package with exposed metal tab thermally and electrically connected to Pin 2 (Ground). Requires solderable heatsink pad or mechanical heatsink attachment for thermal management above 0.5 A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input (14.8–30 V); must be bypassed with ≥0.33 µF capacitor near device |
| Pin 2 | Ground | Common reference for input/output; heatsink surface is internally tied to this pin |
| Pin 3 | Output | Regulated +12 V output; optional 0.1–1.0 µF output capacitor improves transient response |
Key Features
| Feature | Design Value |
|---|---|
| Internal Thermal Shutdown | Activates at TJ ≈ +150°C, halting output until junction cools - prevents permanent damage during overload |
| Short-Circuit Current Limit | 0.2 A typical (Vin = 35 V) - limits fault energy and enables safe auto-recovery after overload removal |
| Safe-Area Compensation | Reduces short-circuit current as VI–VO increases - protects pass transistor during high-differential faults |
| No External Components Required | Operates stably with only input/output capacitors - simplifies BOM and reduces PCB footprint vs. adjustable regulators |
| Pb-Free & RoHS Compliant | Meets J-STD-609 Category 3 moisture sensitivity; qualified per AEC-Q100 for automotive-grade reliability |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powers digital isolators, optocouplers, and level-shifting logic in 24 V rail-based PLC backplanes. IC Role / Device Role / Timing Role: Primary 12 V local regulator supplying isolated communication interfaces and sensor signal conditioning stages. Use Value: Stable 12 V output maintains logic-level integrity across wide ambient temperature (−40°C to +125°C) and input ripple (≤55 dB rejection). |
Use Scenario: Supplies 12 V to microcontroller peripherals, CAN transceivers, and window motor drivers in BCMs. IC Role / Device Role / Timing Role: Fixed-voltage post-regulator downstream of buck converter, ensuring noise-immune MCU core voltage. Use Value: AEC-Q100 qualification and thermal shutdown enable robust operation in engine-bay-adjacent mounting locations. |
| Medical Infusion Pump Controller | Point-of-Sale Terminal Power |
|
Use Scenario: Provides clean 12 V for stepper motor drivers and touch-screen controller ICs in battery-backed medical devices. IC Role / Device Role / Timing Role: Safety-critical local regulator with fail-safe thermal protection to prevent overheating in sealed enclosures. Use Value: Safe-area compensation and 2.2 A peak current support enable brief motor surge loads without latch-up or voltage droop. |
Use Scenario: Delivers regulated 12 V to thermal print heads, EMV card readers, and display backlight drivers. IC Role / Device Role / Timing Role: Cost-optimized fixed-output regulator replacing switching solutions where EMI sensitivity prohibits inductors. Use Value: Low quiescent current (≤6.0 mA) extends battery backup runtime; D2PAK package allows manual rework if needed. |
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 | ±2% output tolerance (11.76–12.24 V), higher quiescent current (4.5–8.0 mA), RJA = 65°C/W (D2PAK) | Lacks AEC-Q100 qualification; not recommended for automotive safety-critical functions | Select when cost sensitivity outweighs automotive compliance; verify thermal margin with lower RJA |
| NCV7812BD2TR4 | Identical electrical specs and package; automotive-grade variant with PPAP capability and extended temp range (−40°C to +150°C) | Qualified for ASIL-B systems; required for OEM automotive designs with traceability requirements | Direct drop-in replacement where automotive qualification is mandatory; same footprint and thermal profile |
Compared with LM7812CD2T, MC7812BD2TR4 offers tighter tolerance and lower quiescent current, while NCV7812BD2TR4 adds automotive qualification without sacrificing performance-making the latter ideal for Tier 1 supply chains requiring PPAP documentation.
Availability
MC7812BD2TR4 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical device power subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC7812BD2TR4 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 designed as a family of rugged, fixed-output linear regulators for local on-card regulation in harsh environments-emphasizing thermal robustness, fault protection, and minimal external component count.
FAQ
What is the maximum input voltage for MC7812BD2TR4?
The absolute maximum input voltage for MC7812BD2TR4 is 35 V DC, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable regulation, input must remain ≥14.8 V (to maintain dropout margin) and ≤30 V (per recommended operating conditions in the datasheet). Sustained operation near 35 V requires aggressive heatsinking due to power dissipation.
Does MC7812BD2TR4 require input and output capacitors?
Yes - MC7812BD2TR4 requires a minimum 0.33 µF input capacitor (tantalum or ceramic) placed directly across Pins 1 and 2 to ensure stability, especially with long input traces. An output capacitor (0.1–1.0 µF) is not mandatory for stability but significantly improves transient response to load steps. The datasheet explicitly warns that values below 0.1 µF may cause instability.
How is thermal management handled on MC7812BD2TR4?
MC7812BD2TR4 uses the D2PAK-3 package with its metal tab (heatsink surface) internally connected to Pin 2 (Ground). Effective thermal management requires soldering the tab to a large copper pour or attaching an external heatsink - both electrically tied to system ground. With RJC = 5.0°C/W, a 1.0 A load at 20 V input dissipates ~20 W; proper heatsinking keeps junction temperature within the +150°C limit.
Is MC7812BD2TR4 pin-compatible with older TO-220 versions?
No - MC7812BD2TR4 uses the D2PAK-3 (Case 936) surface-mount package with Pin 1/Input, Pin 2/Ground (tab), Pin 3/Output. Standard TO-220 (Case 221AB) has identical pin order but different mechanical footprint, thermal path, and soldering requirements. PCB layout and thermal design must be revised; it is not a drop-in replacement without board modification.
What protection features does MC7812BD2TR4 include?
MC7812BD2TR4 integrates three key protection features: (1) Internal thermal shutdown activates at ~+150°C junction temperature, (2) Short-circuit current limiting holds output current to ~0.2 A during faults, and (3) Safe-area compensation dynamically reduces short-circuit current as input-output differential rises - collectively preventing destructive failure under overload, overtemperature, or output short conditions.
MC7812BD2TR4 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):
- 8 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
MC7812BD2TR4 FAQ
1.How can I place an order for MC7812BD2TR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7812BD2TR4 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 MC7812BD2TR4 reliable?
The price and inventory of MC7812BD2TR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7812BD2TR4 is usually 5 days.
3.What payment methods are accepted for MC7812BD2TR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7812BD2TR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7812BD2TR4?
MC7812BD2TR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7812BD2TR4 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 MC7812BD2TR4?
For technical support, including MC7812BD2TR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7812BD2TR4 requirements.
6.How does Aetrix verify that MC7812BD2TR4 is sourced from the original manufacturer or authorized distributors?
All MC7812BD2TR4 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 MC7812BD2TR4 meets industry standards.
7.What is the process for return or replacement of MC7812BD2TR4?
All MC7812BD2TR4 units undergo pre-shipment inspection (PSI). If there is an issue with MC7812BD2TR4, 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 MC7812BD2TR4 part is unused and in its original packaging.
Return procedure for MC7812BD2TR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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