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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics LE50CD

Name: LE50CD
Brand: STMicroelectronics
SKU: LE50CD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LE50CD

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LE50CD.pdf

Description:: IC REG LINEAR 5V 100MA 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:2,716

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Product details

Overview

LE50CD from STMicroelectronics is a very low dropout linear voltage regulator delivering 5.0 V ±2% output at up to 100 mA, featuring 0.2 V typical dropout voltage, 50 µA quiescent current in OFF mode, and TTL-compatible inhibit control for power sequencing in battery-powered systems.

For engineers reviewing the LE50CD datasheet, LE50CD pinout, LE50CD application, or LE50CD equivalent, this device is selected for ultra-low-power local regulation where supply rejection (80 dB typ.), thermal stability (−40 to 125 °C), and minimal external capacitance (2.2 µF) are critical design constraints.

Technical Context

The LE50CD implements a PNP pass transistor architecture with internal current and thermal limiting, enabling stable operation across its full −40 to 125 °C junction temperature range. Its inhibit input (pin 5 in SO-8) accepts TTL-level logic to disable output, reducing quiescent current to 50 µA while maintaining fast wake-up response.

Designed as a pin-to-pin upgrade to L78L50, it retains compatibility with legacy designs while improving dropout performance by >60% and lowering no-load supply current by 80% versus standard 78Lxx regulators. The SO-8 package integrates pins 2, 3, 6, and 7 to the die attach flag for enhanced thermal dissipation (R_thJA = 55 °C/W).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±2% at 25 °C; ensures stable MCU core or sensor biasing without post-regulation trimming
Dropout Voltage	0.2 V typ. at 100 mA; enables regulation from 5.2 V input, extending battery runtime in single-cell Li-ion or dual-cell alkaline systems
Quiescent Current	50 µA in OFF mode; reduces standby power loss to <0.3 µW per regulator in deep-sleep system states
Supply Rejection	80 dB typ. at 120 Hz; suppresses ripple from switching DC/DC converters feeding the LDO input rail
Stability Capacitor	2.2 µF ceramic (ESR 0.1–10 Ω); eliminates need for large tantalum or electrolytic capacitors, saving PCB area and cost
Operating Temperature	−40 to 125 °C junction; supports under-hood automotive modules and industrial edge controllers without derating
Inhibit Logic Threshold	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V; interfaces directly with 3.3 V or 5 V microcontroller GPIO without level-shifting

Pinout & Package

LE50CD is available in SO-8 package with exposed thermal pad connected internally to pins 2, 3, 6, and 7. This modified SO-8 frame reduces thermal resistance (R_thJC = 20 °C/W) and improves power handling when mounted on ≥1 cm² copper pour.

Pin/Terminal	Circuit Role	Design Meaning
1	V_OUT	Regulated 5.0 V output; requires 2.2 µF ceramic capacitor to ground for stability
2	GND	Power ground; electrically tied to die attach flag and pins 3/6/7 for thermal conduction
3	V_IN	Input supply (up to 18 V); must exceed V_OUT + V_DROP for regulation
4	GND	Second ground terminal; shares internal connection with pin 2 for low-inductance return path
5	INHIBIT	TTL-compatible enable/disable control; pulled low to disable output and reduce I_Q to 50 µA
6	GND	Third ground terminal; enhances thermal and EMI performance via multi-point grounding
7	GND	Fourth ground terminal; completes thermal flag connection for optimal heatsinking
8	V_IN	Redundant input terminal; paralleled with pin 3 to lower trace resistance and improve current sharing

Key Features

Feature	Design Value
Ultra-low dropout	0.2 V typical at 100 mA enables operation with minimal headroom-critical for energy-constrained battery systems
TTL inhibit control	Direct interface with 3.3 V/5 V logic allows precise power sequencing and zero-crossing shutdown in multi-rail boards
±2% output accuracy	Guaranteed over temperature and line/load conditions eliminates need for external feedback trimming in cost-sensitive designs
Internal protection	Current limit and thermal shutdown prevent damage during fault conditions without requiring external circuitry
Low-noise operation	50 µV RMS noise (10 Hz–100 kHz) supports noise-sensitive analog sensors and precision ADC references

Applications

Portable Medical Sensors

Automotive Body Control Modules

Use Scenario: Continuous glucose monitor using coin-cell battery and low-power BLE SoC.

IC Role / Device Role / Timing Role: Local 5 V regulator for op-amp signal conditioning and ADC reference, enabled only during measurement bursts.

Use Value: 50 µA OFF-mode current extends battery life beyond 12 months; 0.2 V dropout allows use of depleted 3.6 V Li-SOCl₂ cells.

Use Scenario: Door module with window lift, mirror control, and LED status indicators.

IC Role / Device Role / Timing Role: Inhibit-controlled 5 V rail for microcontroller peripherals, synchronized with CAN bus sleep/wake commands.

Use Value: TTL-compatible INH pin enables direct connection to CAN transceiver's STB pin, eliminating discrete logic and reducing BOM count.

Industrial IoT Edge Node

Smart Energy Metering

Use Scenario: Battery-backed LoRaWAN node monitoring temperature, humidity, and vibration.

IC Role / Device Role / Timing Role: Primary 5 V supply for MCU, radio, and analog front-end, disabled between scheduled transmissions.

Use Value: 2.2 µF stability capacitor reduces footprint by 60% vs. legacy 10 µF tantalum solutions; −40 to 125 °C rating ensures outdoor deployment reliability.

Use Scenario: DIN-rail meter with isolated RS-485, real-time clock, and metrology ADC.

IC Role / Device Role / Timing Role: Precision 5 V reference for 24-bit sigma-delta ADC, powered from auxiliary winding of isolation transformer.

Use Value: 80 dB PSRR at 120 Hz rejects transformer-coupled ripple; ±2% tolerance meets IEC 62053-21 Class 0.2 accuracy requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout voltage regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LDL1117S50R	Fixed 5.0 V output, 1.2 A rating, 1.2 V dropout, no inhibit pin	Higher current capability but unsuitable for ultra-low-I_Q or sequenced shutdown	Select when load exceeds 100 mA and sequencing is not required
TPS76350DBVR	5.0 V output, 150 mA, 0.22 V dropout, 1 µA shutdown current, SOT-23-5	Lower shutdown current but smaller package limits thermal performance above 85 °C	Select for space-constrained designs where <1 µA off-state leakage is mandatory

Compared with LDL1117S50R and TPS76350DBVR, LE50CD uniquely balances ultra-low dropout (0.2 V), industry-grade temperature range (−40 to 125 °C), and integrated inhibit logic in a thermally robust SO-8 package-making it optimal for automotive and industrial power management where reliability and controllability coexist.

Availability

LE50CD is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial IoT edge nodes, and smart energy metering requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for LE50CD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive-grade components.

The LE series is ST's dedicated family of very low-dropout linear regulators targeting battery-powered and thermally constrained applications where efficiency, precision, and integration of enable/inhibit control are essential.

FAQ

What is the minimum input voltage required for LE50CD to maintain regulation at 100 mA load?

The LE50CD requires input voltage ≥5.2 V to sustain 5.0 V output at 100 mA, based on its 0.2 V typical dropout voltage. At worst-case 0.5 V dropout (over temperature), minimum input rises to 5.5 V. Input must remain below 18 V absolute maximum rating.

Can LE50CD be used without the inhibit function?

Yes-LE50CD operates continuously in ON mode if the INHIBIT pin (pin 5) is grounded or tied to V_IN. However, ST recommends grounding the pin when unused to prevent noise-induced false shutdown; floating is not advised due to susceptibility to EMI.

Is an input capacitor required for LE50CD stability?

An input capacitor is not mandatory for stability but strongly recommended: 0.1 µF ceramic placed near pins 3 and 8 suppresses high-frequency noise and improves transient response. The 2.2 µF output capacitor is mandatory and must meet ESR specifications (0.1–10 Ω).

How does LE50CD's thermal performance compare between SO-8 and TO-92 packages?

LE50CD is only offered in SO-8 (not TO-92) for the 'D' suffix variant. The SO-8 package achieves R_thJA = 55 °C/W with 1 cm² copper, versus ~200 °C/W for TO-92-enabling 100 mA continuous operation up to 85 °C ambient without derating, unlike TO-92 variants limited to ~30 mA.

LE50CD Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.5V @ 100mA

Current - Output:: 100mA

Current - Quiescent (Iq):: 1 mA

Current - Supply (Max):: 3 mA

PSRR:: 76dB ~ 60dB (120Hz ~ 10kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

LE50CD FAQ

1.How can I place an order for LE50CD through Aetrix?

Please submit a Request for Quotation (RFQ) for LE50CD on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LE50CD reliable?

The price and inventory of LE50CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE50CD is usually 5 days.

3.What payment methods are accepted for LE50CD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE50CD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LE50CD?

LE50CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LE50CD order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LE50CD?

For technical support, including LE50CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE50CD requirements.

6.How does Aetrix verify that LE50CD is sourced from the original manufacturer or authorized distributors?

All LE50CD products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LE50CD meets industry standards.

7.What is the process for return or replacement of LE50CD?

All LE50CD units undergo pre-shipment inspection (PSI). If there is an issue with LE50CD, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LE50CD part is unused and in its original packaging.

Return procedure for LE50CD:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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