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STMicroelectronics L7812ACD2T
- Part No.:
- L7812ACD2T
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
L7812ACD2T.pdf
- Description:
- IC REG LINEAR 12V 1.5A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,827
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Product details
Overview
L7812ACD2T from STMicroelectronics is a three-terminal positive fixed-voltage linear regulator delivering 12 V ±2% output at up to 1.5 A, featuring thermal overload protection, short-circuit protection, and safe operating area (SOA) protection. It operates across 0 to 125 °C junction temperature and requires only 2 V dropout at 1 A - used for local on-card regulation in industrial power supplies, embedded control modules, and instrumentation front-ends.
For engineers reviewing the L7812ACD2T datasheet, L7812ACD2T pinout, L7812ACD2T application, or L7812ACD2T equivalent, key selection considerations include guaranteed 2% output tolerance (A-grade), extended temperature range operation, TO-220FP package thermal resistance (RthJC = 5 °C/W), and ripple rejection of 60 dB at 120 Hz with 500 mA load.
Technical Context
The L7812ACD2T implements a monolithic bipolar linear regulator architecture with internal current limiting, thermal shutdown, and SOA protection - eliminating need for external foldback or thermal sensors. Its feedback loop is internally compensated for stability with standard 0.33 µF input and 0.1 µF output capacitors.
It accepts input voltages from 14.5 V to 30 V DC for reliable 12 V regulation, sustaining full 1.5 A output under adequate heatsinking. Dropout voltage remains fixed at 2 V (typ.) at 1 A and 25 °C, independent of line or load variation within specified ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12 V ±2% (guaranteed over 0–125 °C; min/max 11.5–12.5 V at full load) |
| Max Output Current | 1.5 A continuous (internally limited; derates above 25 °C junction) |
| Dropout Voltage | 2 V at 1 A and 25 °C - defines minimum input headroom needed for regulation |
| Line Regulation | ≤120 mV (max) over VI = 16–22 V - ensures stable output despite input ripple or sag |
| Load Regulation | ≤240 mV (max) over IO = 5 mA–1.5 A - maintains voltage accuracy across dynamic load steps |
| Ripple Rejection | 60 dB at 120 Hz, 500 mA load - suppresses AC components from unregulated DC sources |
| Quiescent Current | 4.4–6 mA - low bias draw enables efficient light-load operation |
Pinout & Package
Supplied in TO-220FP package: insulated case, vertical mounting, 3-pin through-hole configuration with integrated heatsink tab. Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Input) | Unregulated DC supply input | Accepts 14.5–30 V; must be decoupled with ≥0.33 µF ceramic capacitor close to pin |
| Pin 2 (Ground) | Common reference node | Low-impedance return path for both input and output circuits; connects to heatsink in TO-220FP |
| Pin 3 (Output) | Regulated +12 V output | Delivers up to 1.5 A; requires ≥0.1 µF ceramic capacitor at pin for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Thermal overload protection | Automatic shutdown at ~165 °C junction; resumes after cooldown - prevents permanent damage during sustained overload |
| Short-circuit current limit | 0.35 A (typ.) sustained, 2.2 A peak - protects against wiring faults without blowing fuses |
| Output voltage tolerance | ±2% over full temperature and load range - eliminates need for post-regulation trimming in cost-sensitive designs |
| Extended temperature grade | 0 to 125 °C operating junction range - qualified for industrial ambient environments without derating |
| SOA (Safe Operating Area) protection | Internal circuitry limits power dissipation during transient overloads - avoids second breakdown failure modes |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering microcontrollers, CAN transceivers, and analog sensor interfaces in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator supplying clean 12 V to mixed-signal subsystems from noisy 24 V bus rails. Use Value: 60 dB ripple rejection and 240 mV load regulation ensure stable MCU clocking and ADC reference integrity under varying I/O load conditions. |
Use Scenario: Providing regulated 12 V to door module ECUs managing window lifts, mirror controls, and interior lighting. IC Role / Device Role / Timing Role: Primary 12 V supply rail conditioner tolerant to automotive battery transients (load dump, cold crank). Use Value: Thermal shutdown and SOA protection sustain reliability during intermittent high-current actuator pulses without external supervision. |
| Test & Measurement Front-Ends | Medical Diagnostic Equipment |
|
Use Scenario: Biasing precision op-amps, DACs, and signal conditioning stages in portable multimeters and oscilloscope analog boards. IC Role / Device Role / Timing Role: Low-noise, tightly regulated auxiliary supply isolating sensitive analog circuitry from digital switching noise. Use Value: 75 µV/V output noise and 18 mΩ output impedance minimize added error in µV-level measurements. |
Use Scenario: Powering patient monitoring subsystems (ECG amplifiers, SpO₂ LEDs, display drivers) in Class II medical devices. IC Role / Device Role / Timing Role: Safety-isolated secondary-side regulator meeting IEC 60601 creepage/clearance requirements via TO-220FP insulation. Use Value: Guaranteed 2% output tolerance and 0–125 °C operation support long-term calibration stability and field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-voltage linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7812CD2T | ±4% output tolerance (C-grade), 0–70 °C operating range, higher quiescent current (8 mA) | Suitable for commercial-grade consumer electronics where cost > precision | Select when budget constraints outweigh need for tight tolerance or extended temperature performance |
| MC7812BD2TG | ±4% tolerance, -40 to 125 °C range, lower dropout (1.7 V typ.), higher SVR (63 dB) | Better suited for automotive cold-crank scenarios and higher ripple rejection demands | Prefer when wider input voltage range (down to 13.7 V) or enhanced noise immunity is required |
Compared with LM7812CD2T, L7812ACD2T offers tighter regulation and industrial temperature capability; versus MC7812BD2TG, it trades slightly lower SVR and dropout for superior output accuracy and proven robustness in high-reliability industrial deployments.
Availability
L7812ACD2T is available at Aetrix Electronics and suitable for industrial automation systems, automotive body electronics, test equipment, and medical diagnostics requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for L7812ACD2T 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, designing and manufacturing silicon solutions for automotive, industrial, and power management applications.
L7812ACD2T belongs to the L78 positive voltage regulator IC family - engineered for rugged, cost-effective local regulation in harsh environments where simplicity, reliability, and thermal resilience are prioritized over ultra-low quiescent current or adjustable output.
FAQ
What is the minimum input voltage required for regulation with L7812ACD2T?
The minimum input voltage is 14.5 V DC under full 1 A load and 25 °C junction temperature, based on its 2 V dropout specification. At higher loads or temperatures, input must increase to maintain regulation - e.g., 15.5 V recommended for 1.5 A at 100 °C junction. Input below 14.5 V causes output to track input minus dropout.
Can L7812ACD2T be used without a heatsink?
Yes, for low-power applications: at 25 °C ambient and ≤300 mA load, junction temperature stays below 125 °C without heatsinking. Above that, thermal resistance (RthJA = 60 °C/W for TO-220FP) requires calculation - e.g., 1 A load at 50 °C ambient needs ≤25 °C/W total thermal resistance, mandating a heatsink.
Does L7812ACD2T require input and output capacitors?
Yes - STMicroelectronics specifies ≥0.33 µF ceramic capacitor at the input and ≥0.1 µF ceramic capacitor at the output, placed as close as possible to the respective pins. Omitting them risks instability, oscillation, or poor transient response, especially under fast load changes or high source impedance.
How does the L7812ACD2T behave during short-circuit conditions?
Under short-circuit, it limits output current to ~0.35 A continuously and sustains up to 2.2 A peak briefly before thermal shutdown activates (~165 °C). Once cooled below ~145 °C, it automatically recovers. This cycle repeats if fault persists - protecting both IC and upstream supply without external circuitry.
L7812ACD2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- 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:
- 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 FAQ
1.How can I place an order for L7812ACD2T through Aetrix?
Please submit a Request for Quotation (RFQ) for L7812ACD2T 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 reliable?
The price and inventory of L7812ACD2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7812ACD2T is usually 5 days.
3.What payment methods are accepted for L7812ACD2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7812ACD2T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L7812ACD2T?
L7812ACD2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L7812ACD2T 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?
For technical support, including L7812ACD2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7812ACD2T requirements.
6.How does Aetrix verify that L7812ACD2T is sourced from the original manufacturer or authorized distributors?
All L7812ACD2T 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 meets industry standards.
7.What is the process for return or replacement of L7812ACD2T?
All L7812ACD2T units undergo pre-shipment inspection (PSI). If there is an issue with L7812ACD2T, 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 part is unused and in its original packaging.
Return procedure for L7812ACD2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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