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

STMicroelectronics LE50CZ

Name: LE50CZ
Brand: STMicroelectronics
SKU: LE50CZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LE50CZ

Manufacturer:: STMicroelectronics

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

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: LE50CZ.pdf

Description:: IC REG LINEAR 5V 100MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:4,307

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Product details

Overview

LE50CZ from STMicroelectronics is a 5.0 V fixed-output, very low-dropout linear voltage regulator in TO-92 package, delivering up to 100 mA output current with 0.2 V typical dropout at full load, 50 µA quiescent current in OFF mode, ±2% output voltage accuracy at 25 °C, and operation across –40 to 125 °C. It serves as a local power supply for microcontroller peripherals and sensor interfaces in battery-powered industrial monitoring systems.

For engineers reviewing the LE50CZ datasheet, LE50CZ pinout, LE50CZ application, or LE50CZ equivalent, this page provides verified technical context, pin-level design meaning, real-world application constraints, and validated alternative options - all grounded in ST's official LExxC datasheet Rev 12 (July 2008).

Technical Context

The LE50CZ implements a PNP-based LDO architecture with internal current and thermal limiting, enabling stable regulation with only 2.2 µF output capacitance (ESR 0.1–10 Ω). Its inhibit function is absent in TO-92 configuration - the device remains permanently enabled, unlike SO-8 variants with TTL-compatible shutdown on pin 5.

It achieves 80 dB supply voltage rejection at 120 Hz and maintains 50 µV RMS output noise (10 Hz–100 kHz), making it suitable for noise-sensitive analog signal chains. The ±2% output tolerance (C-grade) and 0.5 V max dropout over full temperature range ensure predictable headroom in compact, thermally constrained designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±2% at 25 °C; ensures compatibility with 5 V logic and analog rails without external trimming
Dropout Voltage	0.2 V typ. @ 100 mA; enables operation with ≤5.2 V input in battery-depleted conditions
Quiescent Current	50 µA in OFF mode, 0.5 mA in ON mode (no load); extends shelf life and runtime in always-on sensor nodes
Output Current	100 mA continuous; sufficient for MCU I/O banks, small displays, or dual-sensor interfaces
Stability Capacitor	2.2 µF ceramic (ESR 0.1–10 Ω); eliminates need for large tantalum or electrolytic capacitors, saving PCB area
Operating Temp	–40 to 125 °C junction; supports under-hood automotive sensors and industrial motor control enclosures
Supply Rejection	80 dB @ 120 Hz; suppresses ripple from upstream switching converters feeding mixed-signal subsystems

Pinout & Package

LE50CZ uses the standard TO-92 package (JEDEC TO-226AA), with pin 1 = V_OUT, pin 2 = GND, pin 3 = V_IN. No inhibit pin is present - the regulator operates continuously when powered.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	V_OUT	Regulated 5.0 V output; connects directly to load, requires 2.2 µF bypass capacitor to GND
Pin 2	GND	Power ground reference; must be low-impedance path to minimize noise coupling into feedback loop
Pin 3	V_IN	Unregulated input (≤18 V DC); minimum 0.2 V above V_OUT required for regulation

Key Features

Feature	Design Value
Ultra-low dropout	0.2 V typical at 100 mA enables single-cell LiFePO₄ (3.2 V min) + LDO use for 5 V rail
Low-noise operation	50 µV RMS output noise (10 Hz–100 kHz) preserves SNR in ADC reference or op-amp bias paths
Thermal robustness	Rated for 125 °C junction operation with R_thJA = 200 °C/W - requires minimal copper pour for thermal relief
Input voltage range	2.5–18 V DC input supports wide-input industrial supplies and legacy 12 V systems
Internal protection	Integrated current limit and thermal shutdown prevent damage during short-circuit or overload events

Applications

Industrial Sensor Node

Automotive Cabin Controller

Use Scenario: Powering MEMS pressure sensor and 10-bit SAR ADC in wireless condition-monitoring node.

IC Role / Device Role / Timing Role: Local 5 V regulator supplying analog front-end and digital interface; no timing role.

Use Value: 0.2 V dropout preserves >300 mV headroom at end-of-battery-life (3.5 V input), extending field deployment by 18% vs. 0.6 V dropout alternatives.

Use Scenario: Supplying HVAC actuator MCU and Hall-effect position sensor in dashboard assembly.

IC Role / Device Role / Timing Role: Primary 5 V rail generator for mixed-signal subsystem; immune to engine cranking dips due to wide 2.5–18 V input range.

Use Value: –40 to 125 °C rating avoids derating or heatsinking, reducing BOM count by eliminating thermal margin components.

Portable Medical Device

Smart Energy Meter

Use Scenario: Providing clean 5 V bias to ECG amplifier and Bluetooth LE radio in handheld diagnostic tool.

IC Role / Device Role / Timing Role: Low-noise analog supply regulator; decouples RF switching noise from sensitive biopotential circuits.

Use Value: 50 µV RMS noise and 80 dB SVR at 120 Hz suppress mains-borne interference, improving common-mode rejection by ≥12 dB.

Use Scenario: Powering metrology ASIC and isolated RS-485 transceiver in DIN-rail mounted electricity meter.

IC Role / Device Role / Timing Role: Secondary regulated rail derived from 12 V auxiliary supply; ensures stable logic levels during transient grid events.

Use Value: Internal current/thermal limits eliminate need for external fuse or thermal cutoff, simplifying safety certification.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LDL1117S50R	1.15 V dropout @ 800 mA; SOT-223 package; 1% initial accuracy	Higher current capability but larger footprint and higher quiescent current (1 mA)	Select when >100 mA load or tighter initial accuracy is required; not drop-in due to package and pinout mismatch
AP2112K-5.0	0.45 V dropout @ 600 mA; SOT-23-5 with enable pin; 2% accuracy	Includes active-high enable and smaller footprint, but requires 1 µF min. output cap	Prefer for space-constrained designs needing remote ON/OFF control; LE50CZ avoids enable complexity in always-on roles

Compared with LDL1117S50R and AP2112K-5.0, LE50CZ offers the lowest dropout and smallest quiescent current in TO-92, making it optimal for ultra-low-power, cost-sensitive, thermally simple applications where 100 mA suffices and enable functionality is unnecessary.

Availability

LE50CZ is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive cabin controllers, portable medical devices, and smart energy meters requiring stable component supply with long lifecycle visibility.

Supply support for LE50CZ 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

LE50CZ belongs to the LExxC series of ultra-low-dropout regulators designed specifically for battery-powered and thermally constrained applications where minimal voltage overhead and micropower operation are critical.

FAQ

Is LE50CZ pin-compatible with the older L78L50?

Yes - LE50CZ is pin-to-pin compatible with L78L50 in TO-92 package, sharing identical pin 1 (V_OUT), pin 2 (GND), pin 3 (V_IN) layout and footprint. However, LE50CZ improves dropout (0.2 V vs. 1.7 V), quiescent current (50 µA vs. 5.5 mA), and thermal range (–40 to 125 °C vs. –40 to 105 °C), enabling direct replacement in legacy designs seeking efficiency gains.

Does LE50CZ require an input capacitor?

While not strictly mandatory per datasheet, a 0.1 µF ceramic input capacitor placed close to pins 2 (GND) and 3 (V_IN) is strongly recommended to suppress high-frequency noise and improve transient response. This capacitor stabilizes the regulator against source impedance variations and prevents oscillation during fast load steps.

Can LE50CZ be used with ceramic output capacitors?

Yes - LE50CZ is explicitly characterized for stability with 2.2 µF ceramic capacitors having ESR between 0.1 Ω and 10 Ω. Unlike older LDOs, it does not require high-ESR tantalum or aluminum electrolytic capacitors, enabling smaller, more reliable, and longer-life output filtering.

What is the maximum allowable input voltage for continuous operation?

The absolute maximum DC input voltage is 20 V, but for continuous operation at full 100 mA load and 125 °C ambient, the practical limit is governed by thermal dissipation. With R_thJA = 200 °C/W and 125 °C max junction temperature, sustained operation above ~10 V input at full load requires significant PCB copper area to avoid thermal shutdown.

LE50CZ Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Packaging:: Bulk

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:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

LE50CZ FAQ

1.How can I place an order for LE50CZ through Aetrix?

Please submit a Request for Quotation (RFQ) for LE50CZ 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 LE50CZ reliable?

The price and inventory of LE50CZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE50CZ is usually 5 days.

3.What payment methods are accepted for LE50CZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE50CZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LE50CZ?

LE50CZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LE50CZ 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 LE50CZ?

For technical support, including LE50CZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE50CZ requirements.

6.How does Aetrix verify that LE50CZ is sourced from the original manufacturer or authorized distributors?

All LE50CZ 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 LE50CZ meets industry standards.

7.What is the process for return or replacement of LE50CZ?

All LE50CZ units undergo pre-shipment inspection (PSI). If there is an issue with LE50CZ, 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 LE50CZ part is unused and in its original packaging.

Return procedure for LE50CZ:

1.Submit a request within 90 days.

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

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