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LM1085IT-5.0/NOPB

TILM1085IT-5.0/NOPB

Texas Instruments
Linear Voltage Regulator IC Positive Fixed 1 Output 3A TO-220-3
Active2,705 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The LM1085IT-5.0/NOPB is a high-performance positive fixed voltage regulator capable of delivering up to 3A of output current. It provides a stable 5V output from an input voltage of up to 25V, making it suitable for high-current digital logic and industrial power rails. The device includes internal current limiting and thermal shutdown protection to ensure reliability under fault conditions.

Why Choose This Part

This regulator features a high 3A output rating in a standard TO-220 package, offering significantly more power than standard 1A or 1.5A linear regulators. It maintains excellent ripple rejection of 68dB at 120Hz and operates across a wide junction temperature range from -40C to 125C.

Applications

High Efficiency Linear Regulators
Used as a post-regulator for switching supplies to provide a clean 5V rail with high current capability.
Battery Chargers
Provides steady current and voltage for charging cycles in portable industrial equipment.
Microprocessor Supplies
Powers high-performance logic boards and embedded systems requiring a stable 5V source at up to 3A.
Constant Current Regulators
Can be configured in circuits to maintain a precision constant current for specialized loads.

Key Specifications

PSRR 68dB (120Hz)
Output Type Fixed
Mounting Type Through Hole
Package / Case TO-220-3
Current - Output 3A
Protection Features Over Current, Over Temperature
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 125degC (TJ)
Voltage - Input (Max) 25V
Voltage Dropout (Max) 1.5V @ 3A
Supplier Device Package TO-220-3
Current - Quiescent (Iq) 10 mA
Voltage - Output (Min/Fixed) 5V

Getting Started

When designing with the LM1085, ensure adequate heat sinking for the TO-220 package to handle power dissipation, calculated as (Vin - Vout) * Iout. Place a 10uF tantalum or electrolytic capacitor at the output to ensure stability, keeping ESR within the datasheet-specified range.

LM1085 Family

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

Part Number Package Stock
LM1085IT-5.0/NOPB (this part) 3-220 2,705
LM1085IS-5.0/NOPB 4-263 872

Also Consider

LD1085V50 STMicroelectronics - A direct 3A low-dropout alternative in a TO-220 package with similar 5V fixed output characteristics.
LT1085CT-5 Analog Devices - A high-performance 3A LDO version of the 1085 series with tight output voltage tolerances.