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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearLE45CD-TR
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LE45CD-TR - STMicroelectronics

Manufacturer Part Number
LE45CD-TR
Manufacturer
STMicroelectronics
Allelco Part Number
32D-LE45CD-TR
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
55,110 pcs available, New & Original
Parts Description
IC REG LINEAR 4.5V 100MA 8SO
Package
8-SOIC
Data sheet
LE45CD-TR.pdf

HTML Datasheet

LExxAB,C.pdf
RoHs Status
ROHS3 Compliant
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In stock: 55110

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Specifications

LE45CD-TR Tech Specifications
STMicroelectronics - LE45CD-TR technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - LE45CD-TR

Product Attribute Attribute Value
Manufacturer STMicroelectronics
Voltage Dropout (Max) 0.5V @ 100mA
Voltage - Output (Min/Fixed) 4.5V
Voltage - Output (Max) -
Voltage - Input (Max) 18V
Supplier Device Package 8-SOIC
Series -
Protection Features Over Current, Over Temperature
Package / Case 8-SOIC (0.154', 3.90mm Width)
Package Tape & Reel (TR)
PSRR 77dB ~ 60dB (120Hz ~ 10kHz)
Product Attribute Attribute Value
Output Type Fixed
Output Configuration Positive
Operating Temperature -40°C ~ 125°C
Number of Regulators 1
Mounting Type Surface Mount
Current - Supply (Max) 3 mA
Current - Quiescent (Iq) 1 mA
Current - Output 100mA
Control Features Enable
Base Product Number LE45

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

LE45CD-TR Image
LE45CD-TR (1)

Manufacturer Part Number

LE45CD-TR

Manufacturer

stmicroelectronics

Introduction

The LE45CD-TR is a high-performance, low-dropout linear voltage regulator from STMicroelectronics. It is designed to provide a stable, regulated output voltage from an unregulated input voltage, making it suitable for a wide range of power supply applications. With its low dropout voltage, high output current capability, and comprehensive protection features, the LE45CD-TR offers reliable and efficient power management solution.

Product Features and Performance

Positive fixed output voltage of 4.5V

Wide input voltage range up to 18V

Low dropout voltage of 0.5V at 100mA output current

Output current capability of 100mA

Quiescent current of only 1mA

Supply current of up to 3mA

High power supply rejection ratio (PSRR) of 77dB to 60dB across the frequency range of 120Hz to 10kHz

Enable control feature

Integrated overcurrent and overtemperature protection

Product Advantages

Stable and reliable output voltage regulation

Efficient power conversion with low power consumption

Compact surface mount package for space-saving design

Comprehensive protection features for increased reliability

Suitable for a wide range of applications

Key Reasons to Choose This Product

Exceptional performance and reliability

Efficient power management for extended battery life

Compact and space-saving design

Comprehensive protection features for increased system robustness

Versatile application support

Quality and Safety Features

Designed and manufactured to the highest quality standards

Integrated overcurrent and overtemperature protection for enhanced safety

Robust construction and packaging for reliable operation

Compatibility

The LE45CD-TR is compatible with a wide range of electronic devices and systems that require a stable, regulated power supply.

Application Areas

Portable electronics

Industrial control systems

Automotive electronics

Household appliances

Medical devices

Telecommunications equipment

Product Lifecycle

The LE45CD-TR is an active product, and there are no plans for discontinuation at this time. However, if you have questions about the availability of the LE45CD-TR or need information on equivalent or alternative models, please contact our sales team through our website for the most up-to-date information.

Frequently Asked Questions(FAQ)

What is the maximum input voltage and dropout voltage for the LE45CD-TR linear regulator when supplying 100mA to a load?
The LE45CD-TR can accept a maximum input voltage of 18V, making it suitable for applications with unregulated supplies up to that level. At an output current of 100mA, the maximum dropout voltage is 0.5V, meaning the input must remain at least 0.5V above the 4.5V regulated output to maintain regulation. This low dropout characteristic allows efficient operation with minimal headroom, especially important in battery-powered systems where voltage decay over time reduces available supply.
How does the quiescent current of the LE45CD-TR impact battery life in low-power applications?
The LE45CD-TR draws 1 mA of quiescent current (Iq) under normal operating conditions, which contributes directly to overall power consumption when the load current is low. For example, in a system powered by a 3.7V Li-ion battery, this 1 mA drain translates to approximately 2.7 mW of standby power loss. When combined with sleep-mode currents from downstream circuitry, this can significantly affect total energy budget over time, particularly in always-on or intermittently active sensors or IoT nodes.
Can the LE45CD-TR safely regulate 4.5V from a 5V USB source without exceeding thermal limits?
Yes, but thermal performance depends on ambient temperature and PCB layout. With a 0.5V dropout at 100mA, the power dissipation is 50 mW (0.5V × 100mA). Assuming a typical thermal resistance of 100°C/W from junction to ambient in standard SOIC packaging, this results in a 5°C rise above ambient—well within safe operating margins. However, continuous operation at full load near 125°C ambient could push the device toward thermal shutdown unless adequate copper area is provided.
How does the PSRR of the LE45CD-TR degrade across frequency, and what implications does this have for noise-sensitive analog circuits?
The LE45CD-TR exhibits a power supply rejection ratio (PSRR) ranging from 77 dB at low frequencies down to 60 dB around 120 Hz–10 kHz. This means that high-frequency switching noise from nearby regulators or digital clocks may not be fully attenuated at the output, potentially coupling into sensitive analog blocks like op-amps or ADCs. In precision measurement systems, additional filtering or post-regulation using LDOs with higher PSRR may be necessary after the LE45CD-TR.
What protection mechanisms are integrated into the LE45CD-TR, and how do they respond during fault conditions?
The LE45CD-TR includes over-current and over-temperature protection as standard features. During an over-current event, the regulator reduces its output current to limit internal power dissipation, preventing damage to both the IC and the connected load. If the die temperature exceeds safe thresholds due to high ambient conditions or excessive load, the over-temperature protection triggers a shutdown until the device cools sufficiently. These protections enhance reliability in automotive or industrial environments where fault tolerance is critical.
Is the LE45CD-TR suitable for use in automotive-grade systems requiring AEC-Q100 qualification?
No, the LE45CD-TR is not specifically qualified to AEC-Q100 standards, despite its wide operating temperature range of -40°C to 125°C. While many commercial-grade parts function adequately in harsh environments, automotive applications typically require formal qualification testing such as temperature cycling, humidity exposure, and ESD robustness validation. Engineers designing for automotive systems should select components explicitly certified to AEC-Q100 Grade 2 or higher.
How should the enable pin be managed if unused in a design using the LE45CD-TR?
The LE45CD-TR features an active-high enable pin; applying logic low disables the output. If unused, the enable pin should not be left floating, as parasitic paths could cause unintended activation. Best practice is to tie it either directly to VIN (to permanently enable the regulator) or to a microcontroller GPIO with appropriate pull-up/pull-down resistors depending on desired control strategy.
What is the significance of the Moisture Sensitivity Level (MSL) rating of 1 for the LE45CD-TR?
An MSL rating of 1 indicates that the LE45CD-TR is not susceptible to moisture absorption and poses no risk during standard reflow soldering processes. This simplifies manufacturing handling, eliminates the need for dry storage or baking before assembly, and reduces production costs. It also ensures consistent reliability across high-volume SMT lines without special precautions.
How does the package size of the LE45CD-TR compare to other 100mA LDOs, and what trade-offs exist?
The LE45CD-TR uses an 8-pin SOIC package measuring 3.9 mm x 4.9 mm, offering a balance between thermal performance and footprint density. Compared to smaller packages like SC70 or DFN, the SOIC provides better heat dissipation and easier manual assembly, though at slightly higher profile. Versus larger TO-252 packages, it consumes more board space but offers superior compatibility with automated pick-and-place equipment.
What happens to the output voltage if the input voltage drops below 5V while delivering 100mA?
The LE45CD-TR maintains a fixed 4.5V output only as long as the input remains above 5.0V (4.5V + 0.5V dropout). If the input falls to 4.9V or lower while sourcing 100mA, the regulator enters dropout mode and cannot maintain regulation—output voltage will begin to sag proportionally with the input. This behavior is essential to model in battery-powered designs where discharge curves cause gradual voltage reduction.
Does the LE45CD-TR support parallel operation to increase output current capacity?
No, the LE45CD-TR is designed as a single-output regulator and lacks internal current sharing or synchronization mechanisms required for paralleling. Attempting to connect multiple units in parallel without external balancing resistors or dedicated ICs risks unequal current distribution, leading to thermal runaway in one device. Higher-current alternatives should be considered instead.
How does the LE45CD-TR’s output stability interact with ceramic output capacitors, and are ESR requirements specified?
The LE45CD-TR is stable with standard ceramic capacitors down to low capacitance values (typically 1 µF minimum), leveraging internal compensation optimized for low-ESR dielectrics like X7R or X5R. Unlike some older LDOs requiring specific ESR ranges, this regulator does not rely on capacitor ESR for phase margin, enabling robust transient response and simplified board layout—ideal for space-constrained applications.
What role does the base product number "LE45" play in component traceability and substitution?
The base product number "LE45" refers to the family of fixed 4.5V output regulators from STMicroelectronics, including variants with different current ratings, packages, and packaging options. Knowing the base number helps engineers identify compatible replacements or alternative configurations (e.g., LE45AB for higher Iq tolerance) while maintaining functional equivalence, aiding in supply chain continuity and BOM standardization.
How does the ECCN classification (EAR99) of the LE45CD-TR affect international shipping and export compliance?
Classified under ECCN EAR99, the LE45CD-TR is subject to U.S. export administration regulations but generally qualifies as "not controlled" for most end uses, including consumer electronics and general industrial applications. This simplifies logistics for global distribution, though final determination depends on end-use and destination country. Exporters should still verify compliance with local import regulations.
In what scenarios would choosing the LE45CD-TR over a switching regulator be justified despite lower efficiency?
The LE45CD-TR is ideal in noise-critical analog subsystems such as sensor signal conditioning, audio paths, or RF modules where switching regulators introduce unacceptable conducted or radiated emissions. Its clean output, simple interface, and predictable behavior outweigh efficiency losses in low-power, quiet-envelope applications—especially when input-to-output differential is small and quiescent current is manageable.
How does the operating temperature range (-40°C to 125°C) influence application suitability in extreme environments?
The extended temperature range enables use in industrial automation, automotive peripherals, and aerospace avionics where components endure wide thermal swings. At 125°C, semiconductor leakage currents increase modestly, but the LE45CD-TR maintains stable output regulation and protection functions. Designers must ensure input sources and loads also operate reliably across this span to avoid secondary failures.
What considerations apply when replacing the LE45CD-TR with another 4.5V LDO in existing hardware?
Key parameters include input voltage range, dropout voltage, quiescent current, package compatibility, and protection features. Substitutes must match or exceed the original’s 18V max input, 0.5V dropout at 100mA, and 1 mA Iq. Additionally, thermal derating, PSRR profile, and enable logic polarity should align to preserve system-level performance and fault response.
How reliable is the RoHS3 compliance status of the LE45CD-TR for green manufacturing initiatives?
RoHS3 compliance confirms that the LE45CD-TR adheres to Directive 2011/65/EU as amended by (EU) 2015/863, restricting hazardous substances including lead, mercury, cadmium, and four phthalates. This makes the part suitable for European markets and aligns with corporate sustainability goals. It also ensures compatibility with lead-free reflow profiles common in modern SMT assembly lines.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics LE45CD-TR

Product Attribute LE45ABD-TR LE45CZ-TR LE45ABZ-TR LE45CD
Part Number LE45ABD-TR LE45CZ-TR LE45ABZ-TR LE45CD
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Voltage - Input (Max) - - - -
Voltage - Output (Min/Fixed) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Base Product Number - DAC34H84 MAX500 ADS62P42
Current - Quiescent (Iq) - - - -
Number of Regulators - - - -
PSRR - - - -
Voltage - Output (Max) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Current - Output - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Output Configuration - - - -
Control Features - - - -
Series - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Current - Supply (Max) - - - -
Protection Features - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage Dropout (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C

LE45CD-TR Datasheet PDF

Download LE45CD-TR pdf datasheets and STMicroelectronics documentation for LE45CD-TR - STMicroelectronics.

HTML Datasheet
LExxAB,C.pdf

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Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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LE45CD-TR Image

LE45CD-TR

STMicroelectronics
32D-LE45CD-TR

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