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STMicroelectronics L7812ACD2T-TR
- Part No.:
- L7812ACD2T-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
L7812ACD2T-TR.pdf
- Description:
- IC REG LINEAR 12V 1.5A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,005
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Product details
Overview
L7812ACD2T-TR from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 12 V output with up to 1.5 A continuous current, ±2 % output voltage tolerance (A-grade), thermal overload protection, short-circuit protection, and safe operating area (SOA) protection. It operates over 0 to 125 °C junction temperature and is commonly used for local regulation in industrial power supplies, embedded control boards, and automotive body electronics.
For engineers reviewing the L7812ACD2T-TR datasheet, L7812ACD2T-TR pinout, L7812ACD2T-TR application, or L7812ACD2T-TR equivalent, key selection criteria include dropout voltage (2 V at 1 A), load regulation (≤100 mV over 5 mA–1.5 A), supply voltage rejection (60 dB at 120 Hz), quiescent current (4.4–6 mA), and thermal resistance (RthJC = 3 °C/W in D²PAK).
Technical Context
This device implements a monolithic series-pass linear regulator architecture with internal current limiting, thermal shutdown, and SOA protection-enabling robust operation without external protection circuitry. Its fixed 12 V output is trimmed during final test to meet ±2 % tolerance across temperature and load.
Designed for use with minimal external components (input/output capacitors only), it supports stable regulation under varying line (VI = 14.5–30 V) and load (IO = 5 mA–1.5 A) conditions, with guaranteed performance across 0–125 °C junction temperature range per the "C" grade designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12 V ±2 % (guaranteed over 0–125 °C, 5 mA–1 A load) |
| Max Output Current | 1.5 A continuous (requires adequate heatsinking; limited by thermal design) |
| Dropout Voltage | 2 V at 1 A, 25 °C (minimum input = 14 V for stable 12 V output) |
| Line Regulation | ≤120 mV (VI = 14.5–30 V, IO = 500 mA, TJ = 25 °C) |
| Load Regulation | ≤100 mV (IO = 5 mA to 1.5 A, TJ = 25 °C) |
| Supply Rejection | 60 dB at 120 Hz (VI = 15–25 V, IO = 500 mA) |
| Quiescent Current | 4.4–6 mA (low standby loss; enables efficient light-load operation) |
| Thermal Resistance | RthJC = 3 °C/W (D²PAK package; critical for thermal design margin) |
Pinout & Package
The L7812ACD2T-TR is housed in a surface-mount D²PAK (TO-263) package with three terminals: Input (Pin 1), Ground (Pin 2), and Output (Pin 3). This thermally enhanced package supports high-current operation when mounted on PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Input) | Unregulated DC input | Accepts 14.5–30 V DC; must be decoupled with ≥0.33 µF ceramic capacitor near pin |
| Pin 2 (Ground) | Common reference node | Low-impedance return path for input/output currents; connects to system ground plane |
| Pin 3 (Output) | Regulated 12 V output | Delivers up to 1.5 A; requires ≥0.1 µF ceramic output capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output with ±2 % tolerance | Enables precise rail generation without external feedback resistors or trimming |
| Integrated thermal shutdown | Prevents permanent damage during sustained overload or poor heatsinking |
| Internal current limiting | Clamps output current to ~2.2 A peak (non-destructive), protecting upstream source |
| Safe Operating Area (SOA) protection | Prevents transistor failure during transient overloads or capacitive loads |
| D²PAK package with RthJC = 3 °C/W | Supports higher continuous current vs. TO-220 or DPAK in space-constrained designs |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Local 12 V rail generation for PLC I/O modules and sensor interfaces powered from 24 V bus. IC Role / Device Role / Timing Role: Primary linear regulator providing clean, low-noise 12 V for microcontrollers and analog front-ends. Use Value: Eliminates need for external protection circuitry; ±2 % tolerance ensures ADC reference stability and relay driver compatibility. | Use Scenario: Powering door lock actuators, window lift controllers, and interior lighting drivers in 12 V vehicle systems. IC Role / Device Role / Timing Role: Secondary regulated supply derived from battery/alternator rail, tolerant of load dump transients when paired with input TVS. Use Value: Thermal and short-circuit protection prevents field failures due to motor stall or wiring faults. |
| Embedded Control Board | Test & Measurement Equipment |
Use Scenario: On-board 12 V regulation for FPGA configuration circuits, level shifters, and isolated communication ICs. IC Role / Device Role / Timing Role: Local point-of-load regulator minimizing voltage drop and noise coupling from shared system rails. Use Value: Low output noise (75 µV/V) and 60 dB ripple rejection preserve signal integrity in mixed-signal subsystems. | Use Scenario: Stable 12 V bias for op-amp stages, DAC buffers, and precision reference circuits in portable calibrators. IC Role / Device Role / Timing Role: Low-drift, low-noise analog supply rail with <−1 mV/°C output drift. Use Value: Tight output tolerance and minimal thermal drift ensure measurement repeatability across ambient temperature changes. |
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 | ±4 % output tolerance (C-grade), RthJC = 5 °C/W (D²PAK), no extended temp guarantee | Suitable for commercial-temp, cost-sensitive designs where tighter tolerance is not required | Select if budget constraints outweigh need for ±2 % accuracy or 125 °C operation |
| MC7812BD2TG | ±4 % tolerance, −40 to 125 °C operation (B-grade), RthJC = 3.5 °C/W | Better low-temp performance than L7812ACD2T-TR but looser output accuracy | Choose for automotive under-hood applications requiring −40 °C start-up, accepting wider voltage tolerance |
Compared with LM7812CD2T and MC7812BD2TG, the L7812ACD2T-TR offers superior output accuracy (±2 % vs. ±4 %) and lower thermal resistance (3 vs. 5 or 3.5 °C/W), making it optimal for high-reliability industrial and extended-temperature applications where regulation precision and thermal headroom are critical.
Availability
L7812ACD2T-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, embedded control boards, and test equipment requiring stable component supply and long-term lifecycle support.
Supply support for L7812ACD2T-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, microcontrollers, sensors, and automotive ICs.
The L78 series belongs to ST's legacy positive voltage regulator IC family, designed for robust, low-cost local regulation in industrial, consumer, and automotive systems where simplicity, reliability, and thermal resilience are prioritized.
FAQ
What is the minimum input voltage required for stable 12 V output at 1.5 A?
The L7812ACD2T-TR requires a minimum input voltage of 14 V to maintain regulation at 1.5 A, based on its 2 V dropout voltage specification at 1 A (derated to ~2.1 V at 1.5 A). For reliable operation across temperature and process variation, 14.5 V is recommended as the practical minimum.
Can this regulator be used without a heatsink?
Yes, at low output currents (<300 mA) and ambient temperatures ≤40 °C, the D²PAK package can operate without an external heatsink. At 1 A and 25 °C ambient, junction temperature rise is ~60 °C (3 °C/W × 20 W dissipation), reaching ~85 °C-within the 125 °C limit. Full 1.5 A operation requires PCB copper pour or external heatsink.
Does L7812ACD2T-TR require input and output capacitors?
Yes: a minimum 0.33 µF ceramic capacitor is required at the input pin, and a minimum 0.1 µF ceramic capacitor at the output pin. These stabilize internal feedback and prevent oscillation. Larger values (e.g., 10 µF tantalum + 100 nF ceramic) improve transient response and ripple rejection.
How does the L7812ACD2T-TR behave during short-circuit events?
During output short-circuit, the device limits peak current to ~2.2 A and activates thermal shutdown if junction temperature exceeds ~160 °C. After cooling, it automatically recovers. Sustained short-circuit at high input voltage may cause repeated cycling; external current limiting or foldback is recommended for mission-critical protection.
L7812ACD2T-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 1.5A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
L7812ACD2T-TR FAQ
1.How can I place an order for L7812ACD2T-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L7812ACD2T-TR 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 L7812ACD2T-TR reliable?
The price and inventory of L7812ACD2T-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7812ACD2T-TR is usually 5 days.
3.What payment methods are accepted for L7812ACD2T-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7812ACD2T-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L7812ACD2T-TR?
L7812ACD2T-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L7812ACD2T-TR 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 L7812ACD2T-TR?
For technical support, including L7812ACD2T-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7812ACD2T-TR requirements.
6.How does Aetrix verify that L7812ACD2T-TR is sourced from the original manufacturer or authorized distributors?
All L7812ACD2T-TR 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 L7812ACD2T-TR meets industry standards.
7.What is the process for return or replacement of L7812ACD2T-TR?
All L7812ACD2T-TR units undergo pre-shipment inspection (PSI). If there is an issue with L7812ACD2T-TR, 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 L7812ACD2T-TR part is unused and in its original packaging.
Return procedure for L7812ACD2T-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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