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onsemi NCP7812TG
- Part No.:
- NCP7812TG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
NCP7812TG.pdf
- Description:
- IC REG LINEAR 12V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,700
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Product details
Overview
NCP7812TG from onsemi is a 3-pin, fixed-output, positive linear voltage regulator delivering 12 V ±4% at up to 1.0 A continuous output current. It features internal thermal shutdown, short-circuit current limiting, safe-area compensation, and enhanced ESD protection (3 kV HBM). It is used in industrial power supplies, embedded control modules, and legacy analog systems requiring stable 12 V rail generation.
For engineers reviewing the NCP7812TG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (2.0 V at 1.0 A), line/load regulation (2.7 mV / 5.5 mV), ripple rejection (55 dB at 120 Hz), junction temperature range (0°C to 125°C), and TO-220-3 package thermal resistance (RθJC = 7.5°C/W).
Technical Context
The NCP7812TG implements a monolithic series pass transistor with integrated protection circuitry including thermal overload shutdown and foldback current limiting. Its safe-area compensation dynamically reduces short-circuit current as input-output differential increases, preventing second breakdown during fault conditions.
It operates within an input voltage range of 14.5 V to 35 V (minimum 14.5 V for 12 V output), requires no external components for basic operation, and maintains regulation across 0°C to 125°C junction temperature with typical quiescent current of 3.0–8.0 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12 V ±4% (11.52–12.48 V at 25°C; 11.40–12.60 V over full load/temperature) |
| Max Output Current | 1.0 A continuous (2.4 A peak, limited by thermal design and heatsinking) |
| Dropout Voltage | 2.0 V at 1.0 A (requires ≥14 V input minimum under full load) |
| Ripple Rejection | 55 dB min at 120 Hz (suppresses AC ripple from unregulated DC inputs) |
| Line Regulation | 2.7 mV max over 14.5–30 V input (ensures stable output despite input variation) |
| Load Regulation | 5.5 mV max over 5 mA–1.5 A load (maintains accuracy across wide current range) |
| ESD Rating | 3 kV HBM (Human Body Model), 400 V MM (Machine Model) - exceeds standard industrial requirements |
| Thermal Resistance | RθJC = 7.5°C/W - enables high-power dissipation with minimal heatsink interface resistance |
Pinout & Package
Package: TO-220-3 (Case 221AB), Pb-free, through-hole mounting. Heatsink surface electrically connected to Pin 2 (GND). Requires mechanical mounting to heatsink via Pin 2 tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive power supply input; must be ≥14.5 V for reliable 12 V regulation at full load |
| 2 | GND | Power ground and device substrate; serves as thermal path to heatsink and reference for all voltages |
| 3 | Vout | Regulated +12 V output; low-noise (6.8 µV/V), low-impedance (3.6 mΩ at 1 kHz) source |
Key Features
| Feature | Design Value |
|---|---|
| Internal thermal shutdown | Activates at 150°C junction temperature, protecting against sustained overload or inadequate heatsinking |
| Safe-area compensated pass transistor | Prevents second breakdown by reducing short-circuit current as Vin−Vout increases - critical for reliability under transient faults |
| No external components required | Stable operation with only optional input bypass (0.33 µF) and output capacitor - simplifies BOM and layout |
| Enhanced ESD tolerance | 3 kV HBM rating for 12 V variant - improves robustness in handling and board assembly environments |
| Pb-free TO-220 package | RoHS-compliant construction with industry-standard footprint and thermal performance (RθJA = 65°C/W) |
Applications
| Industrial Power Supply | Embedded Control Module |
|---|---|
Use Scenario: Providing regulated 12 V rail for PLC I/O modules, sensor interfaces, and relay drivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary linear regulator converting unregulated 24 VDC bus to clean, protected 12 V for analog front-ends and logic. Use Value: Internal short-circuit and thermal protection eliminate need for external fusing or thermal sensors in space-constrained enclosures. | Use Scenario: Powering microcontroller peripherals (ADCs, op-amps, CAN transceivers) in automotive body control units and HVAC controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring noise-sensitive analog circuits operate within 12 V ±5% tolerance. Use Value: 55 dB ripple rejection suppresses switching noise from upstream DC/DC converters, preserving signal integrity. |
| Legacy Analog Instrumentation | Test & Measurement Equipment |
Use Scenario: Replacing obsolete MC7812CT in calibrated benchtop multimeters, oscilloscope auxiliary rails, and signal generators. IC Role / Device Role / Timing Role: Drop-in functional replacement for MC78xx family with improved ESD immunity and tighter thermal specs. Use Value: Same pinout and electrical behavior as MC7812, enabling direct retrofit without PCB redesign or firmware changes. | Use Scenario: Generating stable 12 V bias for precision op-amp stages, reference buffers, and DAC output drivers in calibration-grade equipment. IC Role / Device Role / Timing Role: Low-noise (6.8 µV/V), low-drift (0.47 mV/°C) voltage source supporting sub-mV accuracy requirements. Use Value: Temperature coefficient and load regulation ensure output stays within ±10 mV over full operating range - critical for metrology-grade stability. |
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 |
|---|---|---|---|
| MC7812CT | Same 12 V output, but lower ESD rating (2 kV HBM), no safe-area compensation, wider output tolerance (±5%) | Lacks thermal foldback and enhanced ESD - less robust in harsh industrial environments | Acceptable for cost-sensitive, non-critical legacy replacements where qualification testing is complete |
| LM7812CD2T | 12 V output, ±2% tolerance, higher quiescent current (6–8 mA), no specified safe-area compensation | Better initial accuracy but lower fault resilience; TO-263 package limits thermal performance vs. TO-220 | Preferred when tighter output tolerance is prioritized over thermal survivability and ruggedness |
Compared with MC7812CT and LM7812CD2T, the NCP7812TG offers superior fault protection (safe-area compensation, 3 kV HBM), identical TO-220-3 footprint, and optimized thermal resistance - making it the most robust choice for new designs requiring long-term reliability in variable thermal conditions.
Availability
NCP7812TG is available at Aetrix Electronics and suitable for industrial power supplies, embedded control modules, and test & measurement equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for NCP7812TG 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 (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The NCP7800 series was designed as a rugged, drop-in upgrade to the MC7800 family - targeting industrial and embedded applications where thermal resilience, ESD robustness, and long-term supply stability are essential.
FAQ
What is the minimum input voltage required for stable operation of the NCP7812TG?
The NCP7812TG requires a minimum input voltage of 14.5 V under full 1.0 A load (Vout + VDO = 12 V + 2.0 V). At lighter loads, the dropout voltage decreases, but design margin should maintain ≥14.5 V to ensure regulation across temperature and line variations. Input below this threshold causes output collapse or unregulated behavior.
Does the NCP7812TG require external capacitors for stability?
No, the NCP7812TG is internally compensated and stable without external capacitors. However, a 0.33 µF input bypass capacitor is recommended if the regulator is located >2 inches from the bulk filter, and an output capacitor (≥0.1 µF) improves transient response - though not required for stability per the datasheet.
How does the safe-area compensation in the NCP7812TG improve reliability?
The NCP7812TG's safe-area compensation reduces short-circuit current as the input-output differential voltage increases - preventing second breakdown of the pass transistor during fault conditions. This feature allows the device to survive sustained shorts at high input differentials where conventional regulators would fail catastrophically.
Can the NCP7812TG be used in adjustable-voltage configurations?
Yes, the NCP7812TG can be configured as an adjustable regulator using an external op-amp feedback network (e.g., MC34072V), as shown in Figure 10 of the datasheet. The minimum output is 2.0 V above the internal 12 V reference, enabling outputs from 14 V upward while retaining regulation characteristics.
What thermal considerations apply when using the NCP7812TG at 1.0 A output current?
At 1.0 A with 14.5 V input, power dissipation is ~2.5 W. With RθJC = 7.5°C/W and RθCA ≈ 57.5°C/W (65 − 7.5), junction temperature rise is ~144°C above ambient - exceeding the 125°C max operating limit. A heatsink with ≤15°C/W thermal resistance is required to maintain safe operation at full load and 25°C ambient.
NCP7812TG 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):
- 8 mA
- Current - Supply (Max):
- -
- PSRR:
- 71dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
NCP7812TG FAQ
1.How can I place an order for NCP7812TG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP7812TG 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 NCP7812TG reliable?
The price and inventory of NCP7812TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP7812TG is usually 5 days.
3.What payment methods are accepted for NCP7812TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP7812TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP7812TG?
NCP7812TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP7812TG 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 NCP7812TG?
For technical support, including NCP7812TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP7812TG requirements.
6.How does Aetrix verify that NCP7812TG is sourced from the original manufacturer or authorized distributors?
All NCP7812TG 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 NCP7812TG meets industry standards.
7.What is the process for return or replacement of NCP7812TG?
All NCP7812TG units undergo pre-shipment inspection (PSI). If there is an issue with NCP7812TG, 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 NCP7812TG part is unused and in its original packaging.
Return procedure for NCP7812TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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