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onsemi MC7812ABTG
- Part No.:
- MC7812ABTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7812ABTG.pdf
- Description:
- IC REG LINEAR 12V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,958
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Product details
Overview
MC7812ABTG from onsemi is a 12 V, 1.0 A fixed-output linear voltage regulator in TO-220 package with internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It delivers stable 12 V output across 5 mA–1.0 A load range with ±2.5% initial tolerance (11.75–12.25 V at 25°C), 2.0 V dropout at 1 A, and 60 dB ripple rejection at 120 Hz - used for local regulation in industrial power supplies, automotive control modules, and embedded system rails.
For engineers reviewing the MC7812ABTG datasheet, pinout, applications, or equivalent options, key selection factors include guaranteed 1.0 A continuous output under thermal management, input voltage range of 14.8–30 V DC, load regulation ≤25 mV (5–1.0 A), and compatibility with standard heatsink mounting via Pin 2 (GND/Heatsink).
Technical Context
The MC7812ABTG 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 caps peak output at 0.2 A during fault conditions. Safe-area compensation dynamically reduces short-circuit current as VCE increases to prevent second breakdown.
It operates without external components for basic regulation but requires ≥0.33 µF input bypass capacitor when located >2 inches from bulk filter. Output stability is maintained without output capacitance, though ≥0.1 µF improves transient response. Quiescent current remains ≤6.0 mA across full operating temperature range (−40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12 V nominal; 11.75–12.25 V at TJ = 25°C ensures tight regulation for logic supply rails |
| Output Current | 1.0 A continuous; supports microcontroller, sensor, and peripheral ICs without derating at 25°C |
| Input Voltage Range | 14.8–30 V DC; accommodates 24 V industrial bus with 2 V dropout margin |
| Dropout Voltage | 2.0 V at 1.0 A; enables operation with minimal headroom over 12 V rail |
| Ripple Rejection | 55–60 dB at 120 Hz; suppresses rectified AC noise in unregulated DC inputs |
| Load Regulation | ≤25 mV (5 mA → 1.0 A); maintains stable voltage across dynamic loads like solenoids or displays |
| Thermal Shutdown | Activates at TJ = +150°C; protects against sustained overload or inadequate heatsinking |
Pinout & Package
MC7812ABTG uses the industry-standard TO-220 package (Case 221AB) with metal tab electrically connected to Pin 2 (Ground). The package supports direct heatsink mounting via the tab and is rated for up to 1.0 A continuous output with appropriate thermal design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated DC input | Accepts 14.8–30 V DC; must be bypassed with ≥0.33 µF capacitor near pin for stability |
| 2 (Ground) | Circuit reference and heatsink connection | Common return for input/output; metal tab is electrically tied to this pin for thermal conduction |
| 3 (Output) | Regulated 12 V DC output | Delivers up to 1.0 A; no output capacitor required for stability, but ≥0.1 µF improves transient response |
Key Features
| Feature | Design Value |
|---|---|
| Internal thermal shutdown | Prevents permanent damage during sustained overload or ambient temperature rise |
| Short-circuit current limiting | Clamps output to ≤0.2 A at VIN = 35 V, enabling safe fault recovery without external fusing |
| Safe-area compensated pass transistor | Reduces short-circuit current as VCE increases, avoiding second breakdown failure mode |
| No external components required | Enables drop-in replacement in legacy 78xx designs without redesigning support circuitry |
| 1.5% output voltage tolerance option (AB grade) | Meets tighter spec for precision analog subsystems requiring stable 12 V reference |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering digital isolators, optocouplers, and level-shifting buffers in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Local 12 V rail generator for isolated signal conditioning circuits with high noise immunity. Use Value: Delivers clean, regulated 12 V at up to 1.0 A without external feedback components, reducing BOM count and layout area. |
Use Scenario: Supplying microcontrollers, CAN transceivers, and window lift motor drivers in vehicle door modules. IC Role / Device Role / Timing Role: Primary 12 V regulator for safety-critical sub-systems requiring AEC-Q100-compliant performance. Use Value: Maintains regulation across wide input range (14.8–30 V) and survives load dump transients due to robust internal protection. |
| Embedded Medical Instrumentation | Point-of-Sale Terminal Power Rails |
|
Use Scenario: Providing isolated 12 V bias for analog front-end amplifiers and ADC reference circuits in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, fixed-voltage source with 10 µV/V output noise ensuring signal integrity in sensitive measurement paths. Use Value: Eliminates need for post-regulation filtering; ±2.5% output tolerance meets Class II medical device power accuracy requirements. |
Use Scenario: Generating 12 V for receipt printers, magnetic stripe readers, and display backlight drivers in retail terminals. IC Role / Device Role / Timing Role: Cost-optimized main power regulator supporting mixed-signal peripherals with burst-mode current demands. Use Value: Handles 2.2 A peak current for printer motor startup while maintaining regulation via internal safe-area compensation. |
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 (up to 8.0 mA), lower ripple rejection (50 dB) | Less stringent regulation and noise performance; suitable for non-critical digital logic rails only | Select when cost is primary concern and thermal margin exceeds 10°C; verify heatsink sizing for 1 A operation |
| NCV7812BD2TR4G | AEC-Q100 qualified, −40°C to +150°C operating range, same 12 V/1 A rating and TO-220 package | Designed for automotive under-hood use with extended temperature and qualification requirements | Choose for automotive OEM designs requiring PPAP documentation and zero-defect reliability validation |
Compared with LM7812CD2T and NCV7812BD2TR4G, the MC7812ABTG offers tighter initial tolerance (±2.08% vs ±2%), superior ripple rejection (60 dB vs 50 dB), and lower quiescent current (6.0 mA max vs 8.0 mA), making it optimal for industrial and medical applications where regulation accuracy and noise immunity are critical.
Availability
MC7812ABTG is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MC7812ABTG 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 manufacturer specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The MC7800 series - including MC7812ABTG - was designed as a robust, drop-in-compatible upgrade to legacy 78xx regulators, targeting applications needing enhanced thermal protection, tighter tolerances, and AEC-Q100 compliance for automotive use cases.
FAQ
What is the maximum input voltage for MC7812ABTG?
The absolute maximum input voltage for MC7812ABTG is 35 V DC, but the recommended operating range is 14.8 V to 30 V DC to ensure reliable regulation and thermal performance. Exceeding 30 V increases power dissipation and risks triggering thermal shutdown under full load.
Does MC7812ABTG require an input capacitor?
Yes - MC7812ABTG requires a minimum 0.33 µF input bypass capacitor mounted directly across Pins 1 and 2, especially when located more than 2 inches from the bulk filter. This prevents oscillation and ensures stability under fast load transients, per onsemi's application guidance.
Can MC7812ABTG be used without an output capacitor?
Yes - MC7812ABTG 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 during step-load changes, particularly in microcontroller or display applications.
What is the thermal resistance of MC7812ABTG in TO-220 package?
The MC7812ABTG in TO-220 (Case 221AB) has a junction-to-case thermal resistance (RθJC) of 5.0°C/W and junction-to-ambient (RθJA) of 92°C/W with no heatsink. With a typical 1.5°C/W heatsink, total RθJA drops to ~20°C/W, enabling 1.0 A continuous operation at ambient temperatures up to +70°C.
Is MC7812ABTG pin-compatible with older 7812 variants?
Yes - MC7812ABTG uses the standard TO-220 pinout (Pin 1: Input, Pin 2: Ground/Heatsink, Pin 3: Output) and is functionally and physically compatible with legacy 7812 regulators such as LM7812 and UA7812, enabling direct replacement without PCB modification.
MC7812ABTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- TO-220
MC7812ABTG FAQ
1.How can I place an order for MC7812ABTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7812ABTG 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 MC7812ABTG reliable?
The price and inventory of MC7812ABTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7812ABTG is usually 5 days.
3.What payment methods are accepted for MC7812ABTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7812ABTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7812ABTG?
MC7812ABTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7812ABTG 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 MC7812ABTG?
For technical support, including MC7812ABTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7812ABTG requirements.
6.How does Aetrix verify that MC7812ABTG is sourced from the original manufacturer or authorized distributors?
All MC7812ABTG 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 MC7812ABTG meets industry standards.
7.What is the process for return or replacement of MC7812ABTG?
All MC7812ABTG units undergo pre-shipment inspection (PSI). If there is an issue with MC7812ABTG, 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 MC7812ABTG part is unused and in its original packaging.
Return procedure for MC7812ABTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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