LM109K STEEL

$57.08

Description：IC REG LINEAR 5.05V 1A TO3-2
Series：-
Mfr：Texas Instruments
Package：Tray

SKU:df8684c005a5 Category: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Brand: Texas Instruments

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Product introduction

Product Detailed Parameters

Description：IC REG LINEAR 5.05V 1A TO3-2
Series：-
Mfr：Texas Instruments
Package：Tray
Output Configuration：Positive
Output Type：Fixed
Number of Regulators：1
Voltage - Input (Max)：25V
Voltage - Output (Min/Fixed)：5.05V
Voltage - Output (Max)：-
Voltage Dropout (Max)：-
Current - Output：1A
Current - Quiescent (Iq)：5.2 mA
Current - Supply (Max)：10 mA
PSRR：-
Control Features：-
Protection Features：Over Current, Over Temperature
Operating Temperature：-55°C ~ 150°C
Mounting Type：Through Hole
Package / Case：TO-204AA, TO-3
Supplier Device Package：TO-3-2
Grade：-
Qualification：-

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LM109K STEEL

Overview

The LM109K is a monolithic 5-volt linear voltage regulator fabricated on a single silicon chip by Texas Instruments. Designed for local regulation on digital logic cards, it eliminates distribution problems associated with single-point regulation. The device provides an output current in excess of 1 ampere and includes internal thermal overload protection and current limiting to ensure robust operation under fault conditions. It requires no external components for basic functionality, although input bypassing is recommended if located far from the supply filter capacitor.

Feature Summary

Integrated thermal shutdown and current limiting for enhanced reliability
Fixed 5-volt output designed for TTL and DTL compatibility
No external components required for standard operation

Applications

Local regulation on digital logic cards
Power supplies for TTL and DTL circuits
Precision regulators using the circuit as a control element

Procurement Notes

Verify the specific package variant (TO-39 or TO-5) against the application requirements, as the 'K' suffix typically denotes a metal can package. Confirm that the thermal management strategy aligns with the device's capability to deliver over 1A only with adequate heat sinking. Ensure input bypassing is implemented if the regulator is positioned remotely from the power supply filter capacitor to maintain stability.

Selection Notes

Select this component when a fixed 5-volt output with high current capability is needed for digital logic applications. It is suitable for designs requiring blowout-proof characteristics and simplified bill of materials due to the lack of external component requirements. Consider the thermal constraints carefully, as the full current capability depends on proper heat dissipation through the metal case.

Part Context

The LM109 series consists of complete 5-volt regulators available in standard transistor packages. While the LM109K is a specific variant, the series generally offers flexibility to set output voltages above 5V or serve as control elements in precision regulators. The design prioritizes ease of use and minimization of external parts while providing good rejection of load or line transients common in TTL logic systems.