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L7812ABV

L7812ABV

STMicroelectronics
Linear Voltage Regulator IC Positive Fixed 1 Output 1.5A TO-220
Active12,461 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The L7812ABV is a positive fixed linear voltage regulator that delivers a steady 12V output with a current capacity of up to 1.5A. It features internal current limiting, thermal shutdown, and safe area protection, making it a robust solution for local on-card regulation. This 'A' version offers improved performance with tighter output voltage tolerances and is rated for operation across a wide temperature range of -40 to 125 degrees Celsius.

Why Choose This Part

The L7812ABV is nearly indestructible in standard use cases thanks to its built-in thermal overload and short-circuit protection. It simplifies circuit design by requiring only two external capacitors for stability while offering a high ripple rejection of 60dB at 120Hz.

Applications

On-Card Regulation
Used to eliminate noise and distribution problems associated with single-point regulation in complex systems.
Fixed Voltage Power Supplies
Provides a reliable 12V rail for industrial control circuits and instrumentation from input sources up to 30V.
Automotive Electronics
Suitable for 12V vehicle sub-systems that require stable power despite input fluctuations, benefiting from the extended temperature range.
Laboratory Power Supplies
Serves as a fundamental regulation stage in DIY and educational benchtop power projects due to its simple three-pin TO-220 layout.

Key Specifications

PSRR 60dB (120Hz)
Output Type Fixed
Mounting Type Through Hole
Package / Case TO-220-3
Current - Output 1.5A
Protection Features Over Temperature, Short Circuit
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 125degC
Voltage - Input (Max) 35V
Voltage Dropout (Max) 2V @ 1A (Typ)
Supplier Device Package TO-220
Current - Quiescent (Iq) 6 mA
Voltage - Output (Min/Fixed) 12V

Getting Started

To implement the L7812ABV, connect a 0.33uF ceramic or tantalum capacitor to the input pin and a 0.1uF capacitor to the output pin to ensure stability and improve transient response. Ensure the input voltage remains between 14.8V and 30V, and apply a heatsink to the TO-220 package if the power dissipation exceeds a few watts.

L7812 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number PSRR Temp Range Current - Quiescent (Iq) Stock
L7812ABV (this part) 120Hz -40degC ~ 125degC 6 mA 12,461
L7812CV 120Hz 0degC ~ 125degC 8 mA 37,488

Also Consider

MC7812ACTG ONonsemi - Offers similar 1.5A performance in a TO-220 package with high thermal reliability.