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

STMicroelectronics LE50ABZ

Name: LE50ABZ
Brand: STMicroelectronics
SKU: LE50ABZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LE50ABZ

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LE50ABZ.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:4,270

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Product details

Overview

LE50ABZ from STMicroelectronics is a 5.0 V fixed-output, very low dropout (LDO) linear voltage regulator in SO-8 package with TTL-compatible inhibit control (pin 5), delivering up to 100 mA output current, 0.2 V typical dropout at 100 mA, ±1% output voltage accuracy at 25 °C, and operating across –40 to 125 °C for automotive and industrial power rail regulation.

For engineers reviewing the LE50ABZ datasheet, LE50ABZ pinout, LE50ABZ application, or LE50ABZ equivalent, this device is selected for ultra-low-quiescent-current (50 µA in OFF mode) local regulation in battery-powered systems, noise-sensitive analog subsystems, and thermally constrained PCB layouts requiring minimal external capacitance (2.2 µF).

Technical Context

The LE50ABZ integrates an internal NPN pass transistor with thermal and current limiting, enabling stable operation under transient load steps and overtemperature conditions. Its inhibit logic accepts TTL-level signals to disable output and reduce quiescent current to 50 µA - critical for system-level power sequencing and standby mode management.

Designed as a pin-to-pin upgrade to the legacy L78Lxx series, it retains compatibility while adding active shutdown capability in the SO-8 variant. The SO-8 package features internally bonded pins 2, 3, 6, and 7 to the die attach flag, reducing thermal resistance (R_thJC = 20 °C/W) for improved power dissipation when mounted on copper heatsinking areas.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±1% at 25 °C - ensures precise biasing for 5 V microcontrollers and analog sensors without external trimming.
Dropout Voltage	0.2 V typ. at 100 mA - enables regulation from 5.2 V input, extending usable battery life in single-cell Li-ion or dual-cell alkaline systems.
Quiescent Current	0.5 mA typ. in ON mode, 50 µA in OFF mode - minimizes standby power loss during system sleep states.
Supply Voltage Rejection	80 dB typ. at 120 Hz - suppresses ripple from noisy DC-DC pre-regulators feeding sensitive ADCs or RF front-ends.
Stability Capacitance	2.2 µF ceramic output capacitor - eliminates need for large electrolytics, saving board space and improving reliability.
Operating Temperature	–40 to 125 °C junction - qualified for under-hood automotive modules and industrial motor drives.
Output Current Limit	150 mA short-circuit protected - prevents damage during accidental output shorts without external current-sense circuitry.

Pinout & Package

LE50ABZ is housed in an SO-8 package with exposed die attach flag (pins 2, 3, 6, 7 internally connected) for enhanced thermal performance. Pin 1 = V_OUT, Pin 2 = GND, Pin 3 = V_IN, Pin 4 = GND, Pin 5 = INH (TTL-compatible inhibit), Pin 6 = GND, Pin 7 = GND, Pin 8 = V_IN.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	V_OUT	Regulated 5.0 V output - connects directly to load IC V_CC rails; requires 2.2 µF ceramic capacitor to ground.
Pins 2, 4, 6, 7	GND	Four dedicated ground terminals - reduce ground impedance and improve PSRR by separating input/output return paths.
Pins 3 & 8	V_IN	Dual input pins - lower trace resistance and inductance for high-frequency input ripple rejection; accept 2.5–18 V supply.
Pin 5	INH	Inhibit control input - driven LOW (<0.8 V) to disable output and enter 50 µA standby; HIGH (>2 V) enables regulation.

Key Features

Feature	Design Value
Very low dropout	0.2 V at 100 mA enables operation with minimal headroom - critical for energy harvesting and coin-cell applications.
TTL-compatible inhibit	Pin 5 accepts standard logic levels to enable/disable output without external level-shifting or pull-up resistors.
±1% output accuracy	Guaranteed at 25 °C - eliminates need for post-production calibration in precision sensor signal chains.
Thermally enhanced SO-8	R_thJA = 55 °C/W with PCB copper heatsinking - supports 100 mA continuous output without forced air cooling.
Low-noise output	50 µV RMS noise (10 Hz–100 kHz) - suitable for powering PLLs, ADC references, and audio amplifiers.

Applications

Automotive Body Control Module

Industrial Sensor Node

Use Scenario: Powering CAN transceiver and microcontroller in door module with 12 V battery input subject to load dump and cold cranking.

IC Role / Device Role / Timing Role: Local 5 V LDO providing clean, sequenced supply with inhibit-controlled wake-up via LIN bus.

Use Value: 0.2 V dropout maintains regulation down to 5.2 V during cranking; 50 µA OFF current extends battery life during vehicle sleep.

Use Scenario: Battery-powered wireless temperature/humidity node using ultra-low-power MCU and RF transceiver.

IC Role / Device Role / Timing Role: Primary 5 V regulator with deep-sleep mode triggered by MCU GPIO to minimize system idle current.

Use Value: 2.2 µF stability capacitor reduces BOM count and footprint; ±1% accuracy ensures consistent ADC reference scaling.

Medical Patient Monitor Front-End

POS Terminal Power Management

Use Scenario: Supplying analog front-end (AFE) and precision ADC in portable ECG device powered by rechargeable Li-ion.

IC Role / Device Role / Timing Role: Low-noise 5 V rail generator isolating sensitive analog circuitry from digital switching noise.

Use Value: 50 µV RMS output noise avoids signal degradation; 80 dB SVR rejects ripple from shared DC-DC converter.

Use Scenario: Powering EMV contact smartcard reader and secure element in retail payment terminal with strict thermal limits.

IC Role / Device Role / Timing Role: Thermally robust local regulator with shutdown during card insertion detection.

Use Value: Exposed flag SO-8 package dissipates heat efficiently on limited PCB area; 150 mA short-circuit protection prevents field failures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LDL1117S50R	Fixed 5.0 V, SOT-223, 800 mA output, 1.2 V dropout, no inhibit pin	Higher current, higher dropout, no shutdown - suited for non-battery, high-current loads	Select when >100 mA is required and thermal margin allows larger dropout.
TPS7A2050PDBVR	Fixed 5.0 V, SOT-23-5, 300 mA, 170 mV dropout, enable pin (active-high)	Smaller footprint, lower dropout, active-high EN vs TTL INH - requires logic inversion for direct replacement	Choose for space-constrained designs needing sub-200 mV dropout and active-high control interface.

Compared with LDL1117S50R and TPS7A2050PDBVR, LE50ABZ uniquely balances 100 mA capability, 0.2 V dropout, integrated inhibit logic, and SO-8 thermal performance - making it optimal for automotive and industrial modules where pin compatibility, thermal resilience, and low-quiescent shutdown are jointly required.

Availability

LE50ABZ is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, medical monitoring devices, and POS terminal power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LE50ABZ 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 automotive-grade analog ICs with broad manufacturing and qualification capabilities.

The LE series LDO regulators were developed for cost-sensitive, thermally demanding applications in automotive and industrial markets - emphasizing pin compatibility, low dropout, and robust thermal design in standard packages.

FAQ

What is the maximum input voltage for LE50ABZ?

The absolute maximum DC input voltage is 20 V, but the recommended operating range is 2.5 V to 18 V. Operation above 18 V risks exceeding thermal limits under full load, especially without adequate PCB copper heatsinking. Derating is advised above 15 V at 100 mA output.

Can LE50ABZ be used without the inhibit function?

Yes - if the INH pin (Pin 5) is left unconnected, the device remains enabled by default. However, STMicroelectronics recommends grounding Pin 5 when inhibit is unused to prevent noise-induced false shutdown, as a floating input may pick up interference and cause erratic output behavior.

Is LE50ABZ compatible with ceramic output capacitors only?

Yes - the regulator is optimized for 2.2 µF ceramic capacitors with ESR between 0.1 Ω and 10 Ω. Aluminum or tantalum capacitors are not required and may destabilize the loop due to higher ESR and aging effects. X7R or X5R dielectrics are preferred for stable capacitance over temperature.

How does the SO-8 package thermal performance compare to TO-92?

The SO-8 package achieves R_thJA = 55 °C/W with proper PCB copper heatsinking, versus R_thJA = 200 °C/W for TO-92. This allows LE50ABZ in SO-8 to sustain 100 mA continuously at 125 °C ambient, while the TO-92 version is limited to ~30 mA under same conditions - making SO-8 essential for high-power-density designs.

LE50ABZ 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

LE50ABZ FAQ

1.How can I place an order for LE50ABZ through Aetrix?

Please submit a Request for Quotation (RFQ) for LE50ABZ 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 LE50ABZ reliable?

The price and inventory of LE50ABZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE50ABZ is usually 5 days.

3.What payment methods are accepted for LE50ABZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE50ABZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LE50ABZ?

LE50ABZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LE50ABZ 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 LE50ABZ?

For technical support, including LE50ABZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE50ABZ requirements.

6.How does Aetrix verify that LE50ABZ is sourced from the original manufacturer or authorized distributors?

All LE50ABZ 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 LE50ABZ meets industry standards.

7.What is the process for return or replacement of LE50ABZ?

All LE50ABZ units undergo pre-shipment inspection (PSI). If there is an issue with LE50ABZ, 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 LE50ABZ part is unused and in its original packaging.

Return procedure for LE50ABZ:

1.Submit a request within 90 days.

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

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