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Product Detailed Parameters
- Description：IC REG LINEAR 4.5V 100MA 8-SOIC
- Series：-
- Mfr：STMicroelectronics
- Package：Tube
- 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：Enable
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOIC
- Grade：-
- Qualification：-
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Overview
The LE45CD is a positive fixed linear voltage regulator from the STMicroelectronics LE45 series, housed in an 8-SOIC package. It provides a fixed output of 4.5V with a maximum load current of 100mA. The device supports input voltages up to 18V and features a typical dropout voltage of 0.5V at full load. Key electrical characteristics include a quiescent current of 1mA and power supply rejection ratios ranging from 77dB at 120Hz to 60dB at 10kHz. It operates within a temperature range of -40°C to +125°C and includes overcurrent and thermal shutdown protection.
Feature Summary
- Integrated enable control for power management
- Built-in overcurrent and thermal overload protection
- High power supply rejection ratio for noise reduction
Applications
- Battery-powered equipment requiring stable low-voltage regulation
- Portable devices needing efficient linear power conversion
- General-purpose analog circuit biasing
Procurement Notes
Verify component status as the LE45CD-TR variant is listed as obsolete in distributor records. Confirm availability of alternative packages or pin-compatible replacements if long-term supply is required. Ensure ordering suffixes match specific packaging requirements such as tape and reel or cut tape formats when sourcing from authorized channels.
Selection Notes
Select this component for applications requiring a precise 4.5V fixed output with moderate current demands up to 100mA. Consider the 8-SOIC package for surface-mount assembly constraints. Evaluate thermal performance based on the expected voltage drop and ambient operating conditions to ensure compliance with the specified junction temperature limits.
Part Context
The LE45CD belongs to the LE45 family of low-dropout linear regulators designed for general-purpose power management. These devices are characterized by their simplicity, low quiescent current, and robust protection features. The family offers various fixed output voltages to suit different digital and analog logic levels, making them suitable for a wide range of consumer and industrial electronic designs.
Replacement Considerations
Check for direct pin-to-pin replacements within the same manufacturer's portfolio that maintain the 4.5V output and 100mA capability. Verify that any substitute component matches the 8-SOIC footprint and meets the same electrical specifications for dropout voltage and operating temperature range.
