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onsemi MC7812CDTG
- Part No.:
- MC7812CDTG
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC7812CDTG.pdf
- Description:
- IC REG LINEAR 12V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,286
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Product details
Overview
MC7812CDTG from onsemi is a fixed +12 V, 1.0 A positive linear voltage regulator in DPAK-3 surface-mount 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, with ±2.5% output tolerance at 25°C and dropout voltage of 2.0 V at 1.0 A - ideal for industrial power rails, embedded control boards, and local regulation in automotive-qualified systems.
For engineers reviewing the MC7812CDTG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, real-world design guidance for input/output capacitance, and validated alternative options for cost, availability, or qualification requirements.
Technical Context
The MC7812CDTG 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 (typ.) during fault conditions. 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 ≥0.33 µF input bypass capacitor when located >2 inches from bulk filter; output capacitance (≥0.1 µF) improves transient response but is not required for stability. Ripple rejection is 55–60 dB at 120 Hz across its valid input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +12.0 V nominal, ±2.5% tolerance at 25°C (11.5–12.5 V), maintained over 5 mA–1.0 A load and 14.8–27 V input |
| Output Current | 1.0 A continuous (with adequate heatsinking); peak 2.2 A for short durations |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C - mandates minimum 14 V input for stable 12 V output |
| Ripple Rejection | 55 dB min at 120 Hz (15–25 V input), critical for reducing AC line noise in analog/RF subsystems |
| Quiescent Current | 3.4 mA typical, ≤6.0 mA max - enables low-noise operation without excessive standby loss |
| Thermal Shutdown | Activates at +150°C junction temperature; auto-recovery after cooldown - prevents permanent damage |
| Short-Circuit Limit | 0.2 A typical (at 35 V input) - protects upstream supply and PCB traces during faults |
Pinout & Package
DPAK-3 (TO-252) surface-mount package with exposed thermal pad connected to Pin 2 (Ground). Compact footprint (6.7 mm × 6.2 mm) supports high-power density layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input (VIN) | Unregulated DC input; must exceed 14 V to sustain 12 V output at full load |
| 2 | Ground (GND) | Common reference for input and output; thermal pad tied to this pin for heatsinking |
| 3 | Output (VOUT) | Regulated +12 V supply; requires low-ESR output capacitor for transient stability |
Key Features
| Feature | Design Value |
|---|---|
| No external components needed | Enables plug-and-play 12 V regulation without feedback resistors or compensation networks |
| Internal thermal shutdown | Prevents catastrophic failure during overload or poor heatsinking - no external sensor required |
| Safe-area compensated pass transistor | Automatically derates short-circuit current as input-output differential rises, avoiding second breakdown |
| 1.5% to 4% output tolerance options | MC7812CDTG uses 2% tolerance binning - balances precision and cost for industrial applications |
| Pb-free and RoHS-compliant | Meets global environmental directives; qualified per J-STD-020 moisture sensitivity level 1 |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Local 12 V rail generation for microcontroller, CAN transceiver, and sensor interfaces on a DIN-rail mounted PLC board. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, protected 12 V from a 24 V intermediate bus. Use Value: Eliminates need for discrete protection circuitry; thermal shutdown ensures reliability during ambient temperature spikes up to 85°C. |
Use Scenario: Powering MCU, LIN transceiver, and LED drivers in a door module exposed to automotive temperature cycling. IC Role / Device Role / Timing Role: Fixed-voltage LDO replacement for legacy discrete regulators in AEC-Q100-compliant designs. Use Value: NCV7812BDTRKG is pin-compatible and AEC-Q100 qualified - enables drop-in upgrade path without layout change. |
| Point-of-Load Regulation | Legacy Equipment Retrofit |
|
Use Scenario: On-board 12 V supply for FPGA I/O banks and ADC reference circuits in test equipment. IC Role / Device Role / Timing Role: Low-noise local regulator minimizing supply-induced jitter in high-resolution data acquisition. Use Value: 10 µV/V output noise and 55 dB ripple rejection suppress switching noise from upstream DC/DC converters. |
Use Scenario: Replacing obsolete 7812 variants in aging medical device power supplies requiring long-term component continuity. IC Role / Device Role / Timing Role: Direct functional replacement maintaining identical pinout, thermal profile, and safety certifications. Use Value: Onsemi's 15+ year product longevity commitment and traceable sourcing ensure BOM stability through 2030+. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed +12 V linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCV7812BDTRKG | AEC-Q100 qualified; tighter 2% tolerance; same DPAK-3 package and pinout | Required for automotive body electronics; supports extended temperature range (−40°C to +125°C) | Select when automotive qualification, enhanced temp range, or PPAP documentation is mandatory |
| LM7812CDT/NOPB | TI part; 2% tolerance; TO-263 (D2PAK) package; higher RJA (65°C/W vs. 92°C/W) | Higher thermal resistance demands larger heatsink area; not automotive-qualified | Choose if TI supply chain preference exists or when D2PAK mechanical fit is required |
Compared with MC7812CDTG, NCV7812BDTRKG adds automotive qualification and wider operating temperature support without layout impact, while LM7812CDT/NOPB offers alternate sourcing with trade-offs in thermal performance and qualification scope.
Availability
MC7812CDTG is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.
Supply support for MC7812CDTG 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The MC7800 series was designed as cost-optimized, robust fixed-voltage linear regulators for local point-of-load regulation in space-constrained, thermally demanding environments.
FAQ
What is the maximum input voltage rating for MC7812CDTG?
The absolute maximum input voltage for MC7812CDTG is 35 V DC, but continuous operation is specified only up to 27 V input for 1.0 A output. Exceeding 27 V risks exceeding power dissipation limits and triggering thermal shutdown - design margin requires keeping VIN ≤ 25 V for full-load reliability.
Does MC7812CDTG require input and output capacitors?
MC7812CDTG does not require output capacitance for stability, but ≥0.1 µF ceramic or tantalum capacitor is recommended to improve transient response. An input bypass capacitor ≥0.33 µF is mandatory if the regulator is more than 2 inches from the bulk filter - low-ESR types minimize high-frequency oscillation risk.
Can MC7812CDTG be used in adjustable configurations?
Yes - MC7812CDTG can be configured as an adjustable regulator using external resistors and a Zener diode per Figure 10 in the datasheet. However, doing so voids the factory-trimmed 12 V accuracy and requires recalculating thermal dissipation, as the internal reference remains fixed at ~12 V.
What is the thermal resistance of MC7812CDTG in DPAK-3 package?
MC7812CDTG in DPAK-3 package has RJA = 92°C/W (no heatsink) and RJC = 5.0°C/W. With a 1-in² copper pour (2 oz), effective RJA drops to ~50°C/W - enabling 1.0 A operation at ambient ≤60°C. Always verify junction temperature using TJ = TA + (PDISS × RJA).
Is MC7812CDTG pin-compatible with older 7812 variants?
Yes - MC7812CDTG uses standard DPAK-3 (TO-252) pinout: Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output. It replaces legacy MC7812CT (TO-220) and MC7812CD2T (D2PAK) in surface-mount designs, though thermal and package footprint differences require layout verification.
MC7812CDTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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):
- 6.5 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:
- DPAK
MC7812CDTG FAQ
1.How can I place an order for MC7812CDTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7812CDTG 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 MC7812CDTG reliable?
The price and inventory of MC7812CDTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7812CDTG is usually 5 days.
3.What payment methods are accepted for MC7812CDTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7812CDTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7812CDTG?
MC7812CDTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7812CDTG 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 MC7812CDTG?
For technical support, including MC7812CDTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7812CDTG requirements.
6.How does Aetrix verify that MC7812CDTG is sourced from the original manufacturer or authorized distributors?
All MC7812CDTG 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 MC7812CDTG meets industry standards.
7.What is the process for return or replacement of MC7812CDTG?
All MC7812CDTG units undergo pre-shipment inspection (PSI). If there is an issue with MC7812CDTG, 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 MC7812CDTG part is unused and in its original packaging.
Return procedure for MC7812CDTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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