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

STMicroelectronics LE50CZ-TR

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

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Part No.:: LE50CZ-TR

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LE50CZ-TR.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,907

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Product details

Overview

LE50CZ-TR 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), 100 mA output current capability, ±2 % output voltage accuracy at 25 °C, and 0.2 V typical dropout at full load - designed for local regulation in battery-powered or low-noise embedded systems requiring standby power management.

For engineers reviewing the LE50CZ-TR datasheet, LE50CZ-TR pinout, LE50CZ-TR application, or LE50CZ-TR equivalent, this device is selected for ultra-low quiescent current (50 µA in OFF mode), minimal external capacitance (2.2 µF), wide input range (up to 18 V), thermal/overcurrent protection, and compatibility with legacy L78Lxx footprints in space-constrained PCB layouts.

Technical Context

The LE50CZ-TR integrates a precision bandgap reference, error amplifier, pass transistor, and internal current/thermal limiting circuitry. Its inhibit logic accepts TTL-level signals on pin 5 to enable/disable regulation without external components, reducing system standby power by cutting quiescent current to 50 µA when disabled.

It operates across –40 to +125 °C junction temperature and maintains stability with only 2.2 µF ceramic output capacitor (ESR 0.1–10 Ω), eliminating need for electrolytic or tantalum capacitors. The SO-8 package uses an internally modified frame with pins 2, 3, 6, and 7 tied 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/peripheral rail within industrial tolerance bands
Dropout Voltage	0.2 V typ. @ 100 mA - enables operation from 5.2 V input, critical for single-cell Li-ion or low-voltage battery systems
Quiescent Current	0.5 mA typ. ON / 50 µA typ. OFF - extends battery life in always-on sensor nodes with periodic wake-up
Output Current	100 mA continuous - sufficient for powering microcontrollers, sensors, and small logic circuits locally
Supply Rejection	80 dB typ. @ 120 Hz - suppresses ripple from noisy switching supplies feeding the LDO input
Operating Temp	–40 to +125 °C - supports under-hood automotive, industrial control, and outdoor IoT deployments
Stability Cap	2.2 µF ceramic - reduces BOM cost and board area vs. larger electrolytic alternatives

Pinout & Package

LE50CZ-TR is housed in an SO-8 package with exposed thermal pad (pins 2, 3, 6, 7 internally connected to die attach flag). 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_OUT.

Pin/Terminal	Circuit Role	Design Meaning
1, 8	V_OUT	Dual output pins reduce trace resistance and improve current sharing for 100 mA delivery
2, 4, 6, 7	GND	Four ground pins minimize ground bounce and enhance thermal conduction to PCB copper
3	V_IN	Input supply pin - accepts up to 18 V DC, enabling use after wide-input buck converters
5	INH	Inhibit control - logic low disables regulator, reducing I_Q to 50 µA; floating defaults to ON

Key Features

Feature	Design Value
Very low dropout	0.2 V typ. @ 100 mA - allows operation with minimal headroom, e.g., 5.2 V input for 5.0 V output
TTL-compatible inhibit	Pin 5 accepts 0–0.8 V (low) / 2–18 V (high) - interfaces directly with MCU GPIO without level-shifting
Thermal & current limit	Internally protected against >125 °C junction temp and >150 mA overload - eliminates need for external foldback circuitry
±2 % output accuracy	At 25 °C, 10 mA load - meets tight tolerance requirements for ADC references and analog sensor biasing
Low-noise output	50 µV RMS noise (10 Hz–100 kHz) - suitable for powering precision op-amps and RF front-ends

Applications

Industrial Sensor Node

Automotive Body Control Module

Use Scenario: Battery-powered wireless temperature/humidity node with BLE MCU and analog sensors.

IC Role / Device Role / Timing Role: Local 5.0 V regulator supplying MCU core, ADC, and transceiver; INH pin synchronized to sleep/wake cycles.

Use Value: 50 µA OFF-mode current extends 2xAA alkaline battery life beyond 5 years in deep-sleep duty cycle.

Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting.

IC Role / Device Role / Timing Role: Secondary 5.0 V rail for microcontroller and CAN transceiver, enabled only during ignition or key-fob wake events.

Use Value: Inhibit function cuts standby current below 100 µA, meeting OEM <100 µA "parked vehicle" leakage limits.

Medical Wearable Monitor

POS Terminal Power Sequencing

Use Scenario: ECG patch with ultra-low-power MCU, analog front-end, and Bluetooth LE radio.

IC Role / Device Role / Timing Role: Primary 5.0 V supply for signal chain and radio; regulated from single Li-Po cell via boost+LDO architecture.

Use Value: 0.2 V dropout enables >92 % efficiency at light loads, minimizing heat generation on skin-contact surface.

Use Scenario: Retail terminal with multiple voltage rails (3.3 V, 5.0 V, 12 V) and controlled power-up sequence.

IC Role / Device Role / Timing Role: 5.0 V LDO with INH pin driven by sequencer IC to delay activation until main 12 V rail stabilizes.

Use Value: Eliminates need for discrete MOSFET + resistor timing network, reducing component count and layout complexity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LDL112P50R	Lower IQ (1.2 µA OFF), same 5 V/100 mA, but no inhibit pin; SOT-23-5 package	Best for ultra-low-power always-on sensing where shutdown control is unnecessary	Select when minimal footprint and lowest possible standby current outweigh need for active inhibit control
LDK220M50	Higher accuracy (±1 %), 200 mA output, but requires 4.7 µF min. ceramic cap and lacks INH pin	Suitable for higher-current digital loads where tighter regulation justifies larger capacitor	Choose when output precision and current headroom are prioritized over inhibit functionality and capacitor size

Compared with LDL112P50R and LDK220M50, LE50CZ-TR uniquely balances TTL-compatible inhibit control, SO-8 thermal performance, and 2.2 µF stability in a ±2 % 5 V LDO - making it optimal for space-constrained, battery-aware designs requiring programmable power gating.

Availability

LE50CZ-TR is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, medical wearables, and POS terminals requiring stable component supply with long lifecycle visibility.

Supply support for LE50CZ-TR 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, delivering silicon solutions for smart driving, power management, and embedded processing.

The LE series LDOs were developed to replace legacy 78Lxx regulators with improved dropout, quiescent current, and integration - targeting battery-operated, thermally constrained, and safety-critical embedded systems.

FAQ

What is the minimum input voltage required for stable 5.0 V output at 100 mA?

The LE50CZ-TR maintains regulation down to VIN = VOUT + VDROPOUT = 5.0 V + 0.4 V (max, over temperature) = 5.4 V. At room temperature, 5.2 V input suffices due to 0.2 V typical dropout. Input must remain ≥5.4 V across full load and temperature range to avoid dropout.

Can the INH pin be left unconnected, and what happens if it is?

Yes, the INH pin may be left floating, and the device defaults to ON mode per internal pull-up. However, STMicroelectronics recommends grounding INH when not used to prevent noise-induced false disable events - especially in electrically noisy environments like automotive or industrial settings.

Is an input capacitor required, and what value is recommended?

An input capacitor is strongly recommended to suppress high-frequency noise and stabilize the source impedance. STMicroelectronics specifies 0.1 µF ceramic (CI) in all electrical characteristic tables. For systems with long traces or switching supply sources, adding a 1–10 µF bulk capacitor in parallel improves transient response and reduces input ripple.

How does thermal performance compare between SO-8 and TO-92 packages for this device?

The SO-8 package (used by LE50CZ-TR) achieves R_thJA = 55 °C/W with proper PCB copper pour, versus 200 °C/W for TO-92. This allows ~3× higher continuous power dissipation - critical for 100 mA loads at high ambient temperatures or elevated input-to-output differentials.

LE50CZ-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

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-TR FAQ

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

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

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

3.What payment methods are accepted for LE50CZ-TR?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LE50CZ-TR?

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

Once your LE50CZ-TR 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-TR?

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

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

All LE50CZ-TR 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-TR meets industry standards.

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

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

Return procedure for LE50CZ-TR:

1.Submit a request within 90 days.

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

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