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STMicroelectronics L7812ABD2T-TR
- Part No.:
- L7812ABD2T-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
L7812ABD2T-TR.pdf
- Description:
- IC REG LINEAR 12V 1.5A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:35,670
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Product details
Overview
L7812ABD2T-TR 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 –40 °C to +125 °C junction temperature range and is housed in a D²PAK surface-mount package, commonly used for local on-card regulation in industrial power supplies and embedded control systems.
For engineers reviewing the L7812ABD2T-TR datasheet, L7812ABD2T-TR pinout, L7812ABD2T-TR application, or L7812ABD2T-TR equivalent, key selection criteria include guaranteed ±2% output tolerance over temperature, 2 V dropout voltage at 1 A, 60 dB supply voltage rejection at 120 Hz, 18 mΩ output resistance, and compatibility with standard 0.33 µF input / 0.1 µF output capacitor configuration.
Technical Context
This IC implements a monolithic series-pass linear regulation architecture with internal current limiting, thermal shutdown, and SOA protection-enabling robust operation without external protection circuitry. Its design targets stable DC voltage generation from unregulated DC inputs, requiring minimal external components: only input and output capacitors.
The device supports fixed 12 V output with no adjustment capability, and its performance is specified under defined test conditions: VI = 19 V, IO = 1 A, TJ = –40 °C to +125 °C. Line regulation is characterized over VI = 14.5 V to 30 V, and load regulation covers IO = 5 mA to 1.5 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12 V ±2% (guaranteed over –40 °C to +125 °C; enables precise 12 V rail without trimming) |
| Max Output Current | 1.5 A (continuous; limited by thermal design and heatsinking capability) |
| Dropout Voltage | 2 V at 1 A and 25 °C (defines minimum input–output differential needed for regulation) |
| Supply Voltage Rejection | 60 dB at 120 Hz, 15–25 V input (attenuates ripple from upstream converters or rectifiers) |
| Output Resistance | 18 mΩ at 1 kHz (determines load-induced output voltage sag under dynamic current steps) |
| Quiescent Current | 4.4–6 mA (low standby consumption; stable across input voltage and load variations) |
| Thermal Shutdown Threshold | Internally set (protects against sustained overtemperature; auto-recovery on cooldown) |
Pinout & Package
Package: D²PAK (TO-263), surface-mount, single-row 3-pin thermally enhanced plastic package with exposed tab for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated DC input connection | Accepts 14.5–30 V DC; requires 0.33 µF ceramic capacitor placed near pin for stability |
| 2 (Ground) | Reference and return path | Common node for input capacitor ground, output capacitor ground, and load return; low-inductance layout critical |
| 3 (Output) | Regulated 12 V DC output | Delivers up to 1.5 A; requires 0.1 µF ceramic capacitor placed within 5 mm of pin for high-frequency decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Extended temperature operation | Rated for –40 °C to +125 °C junction temperature-suitable for automotive under-hood and industrial control environments |
| Output voltage tolerance | ±2% at 25 °C and full load-reduces need for post-regulation trimming in cost-sensitive designs |
| Integrated protection | Thermal shutdown, short-circuit current limiting, and SOA protection eliminate need for external fuses or foldback circuits |
| Low noise performance | 10 µV/√Hz output noise (10 Hz–100 kHz bandwidth)-minimizes interference in analog sensor or audio subsystems |
| Thermal resistance | RthJC = 3 °C/W (junction-to-case)-enables high-power dissipation when mounted to copper pour or heatsink |
Applications
| Industrial PLC Power Rails | Automotive Body Control Modules |
|---|---|
Use Scenario: Local 12 V supply for microcontroller, CAN transceiver, and I/O drivers in programmable logic controllers. IC Role / Device Role / Timing Role: Primary local regulator converting 24 V system bus to stable 12 V for logic and interface ICs. Use Value: ±2% output tolerance ensures reliable reset behavior and ADC reference stability across temperature extremes. |
Use Scenario: Powering door module ECUs, window lift controllers, and mirror actuators in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Secondary regulated rail generator downstream of main DC/DC converter, providing fault-tolerant 12 V. Use Value: Integrated thermal and short-circuit protection prevents latch-up during load dump or wiring faults. |
| Embedded Motor Drive Logic Supplies | Test & Measurement Instrumentation |
Use Scenario: Isolated 12 V logic supply for gate drivers and position feedback circuitry in brushless motor inverters. IC Role / Device Role / Timing Role: Local regulation stage decoupling high-noise power stages from sensitive control logic. Use Value: 60 dB ripple rejection suppresses switching noise from adjacent half-bridge stages, preserving PWM timing integrity. |
Use Scenario: Stable 12 V bias for op-amps, precision references, and data acquisition front-ends in benchtop analyzers. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source for analog signal conditioning paths. Use Value: 10 µV/√Hz noise density and –1 mV/°C drift ensure sub-mV measurement accuracy over ambient temperature swings. |
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, 0 to +125 °C operating range, TO-263 package, higher quiescent current (6–8 mA) | Suitable for commercial-grade equipment where extended temperature range is not required | Select when cost sensitivity outweighs precision and automotive/industrial temp requirements |
| MC7812BD2TG | ±2% tolerance, –40 to +125 °C, D²PAK, but lower SVR (55 dB @ 120 Hz) and higher output resistance (22 mΩ) | Acceptable for less noise-sensitive digital loads, but marginal for analog signal chains | Choose only if STMicroelectronics supply continuity is constrained and thermal specs remain acceptable |
Compared with LM7812CD2T and MC7812BD2TG, the L7812ABD2T-TR offers tighter output tolerance, superior ripple rejection, and lower output impedance-making it preferred for precision analog, automotive, and wide-temperature industrial applications where regulation stability is critical.
Availability
L7812ABD2T-TR is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, embedded motor drive logic supplies, and test & measurement instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for L7812ABD2T-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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
The L78 series belongs to ST's legacy positive voltage regulator ICs product line, engineered for simplicity, ruggedness, and broad applicability in local DC-DC conversion-prioritizing reliability and ease of use over programmability or ultra-low quiescent current.
FAQ
What is the minimum input voltage required for regulation with L7812ABD2T-TR?
The minimum input voltage is 14.5 V under full-load (1 A) and room-temperature conditions, based on its 2 V dropout specification. At higher junction temperatures or peak load currents approaching 1.5 A, the effective dropout may increase slightly; derating to ≥15 V input is recommended for margin in production designs.
Can L7812ABD2T-TR be used without an input capacitor?
No-STMicroelectronics specifies a minimum 0.33 µF ceramic capacitor between input and ground, placed as close as possible to the input pin. Omitting it risks instability, oscillation, or failure to regulate under transient load conditions due to parasitic inductance in PCB traces.
Does L7812ABD2T-TR require a heatsink in typical applications?
A heatsink is required when power dissipation exceeds ~1.5 W (e.g., 24 V input at 1 A yields ~12 W dissipation). With its RthJC = 3 °C/W and RthJA = 62.5 °C/W, adequate copper pour (≥4 cm² 2-oz inner layer) is essential; for >0.5 A continuous load at >20 V input, a dedicated heatsink or thermal via array is strongly advised.
How does the L7812ABD2T-TR behave during short-circuit events?
It enters current-limit mode at ~0.2 A (typical short-circuit current), then activates thermal shutdown if junction temperature exceeds ~165 °C. After fault removal and cooldown, it automatically recovers-no latch or manual reset required. Peak short-circuit current reaches 2.2 A briefly before limiting engages.
L7812ABD2T-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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
L7812ABD2T-TR FAQ
1.How can I place an order for L7812ABD2T-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for L7812ABD2T-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 L7812ABD2T-TR reliable?
The price and inventory of L7812ABD2T-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L7812ABD2T-TR is usually 5 days.
3.What payment methods are accepted for L7812ABD2T-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L7812ABD2T-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L7812ABD2T-TR?
L7812ABD2T-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L7812ABD2T-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 L7812ABD2T-TR?
For technical support, including L7812ABD2T-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L7812ABD2T-TR requirements.
6.How does Aetrix verify that L7812ABD2T-TR is sourced from the original manufacturer or authorized distributors?
All L7812ABD2T-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 L7812ABD2T-TR meets industry standards.
7.What is the process for return or replacement of L7812ABD2T-TR?
All L7812ABD2T-TR units undergo pre-shipment inspection (PSI). If there is an issue with L7812ABD2T-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 L7812ABD2T-TR part is unused and in its original packaging.
Return procedure for L7812ABD2T-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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