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Product Detailed Parameters
- Description：IC REG LINEAR 4.5V 100MA TO92-3
- Series：-
- Mfr：STMicroelectronics
- Package：Bulk
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：18V
- Voltage - Output (Min/Fixed)：4.5V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.5V @ 100mA
- Current - Output：100mA
- Current - Quiescent (Iq)：1 mA
- Current - Supply (Max)：3 mA
- PSRR：77dB ~ 60dB (120Hz ~ 10kHz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-226-3, TO-92-3 (TO-226AA)
- Supplier Device Package：TO-92-3
- Grade：-
- Qualification：-
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Overview
The LE45CZ is a fixed-output linear voltage regulator manufactured by STMicroelectronics. It provides a stable 4.5V output with a maximum current capacity of 100mA. The device supports an input voltage range up to 18V and features a typical dropout voltage of 0.5V at full load. It operates with a low quiescent current of approximately 1mA, ensuring efficient power management in battery-powered applications.
Feature Summary
- Fixed 4.5V output voltage configuration for precise supply requirements
- Low dropout characteristic enabling operation with minimal input-to-output differential
- High power supply rejection ratio (PSRR) for effective noise suppression
- Low quiescent current consumption to extend battery life
Applications
- Battery-powered portable electronic devices
- Precision analog circuit biasing
- Noise-sensitive sensor power supplies
- Embedded system voltage regulation
Procurement Notes
Verify the package type matches your design requirements, as this component is typically available in TO-92-3 through-hole packaging. Confirm that the fixed 4.5V output aligns with your system's voltage needs, as adjustable variants are not applicable here. Ensure thermal management considerations are addressed for the specific PCB layout to maintain reliability under continuous load conditions.
Selection Notes
Select this regulator when a fixed 4.5V rail is required with moderate current demands up to 100mA. It is suitable for applications prioritizing low noise and simple implementation over high efficiency. Consider the input voltage headroom relative to the dropout voltage to ensure stable regulation across the entire operating temperature range and load profile.
Part Context
This component belongs to the family of low-dropout linear regulators designed for general-purpose power management. Unlike high-voltage industrial LDOs, this part focuses on low-power consumer and industrial electronics where simplicity and cost-effectiveness are critical. It serves as a fundamental building block for creating clean DC voltages from higher unregulated sources.
Replacement Considerations
Check for pin-compatible alternatives such as other 4.5V fixed LDOs in TO-92 packages from different manufacturers. Verify that substitute parts meet or exceed the 100mA output current and 18V input voltage specifications. Ensure thermal performance and PSRR characteristics are comparable to avoid signal integrity issues in sensitive circuits.
