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

STMicroelectronics LE50CZ-AP

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

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Part No.:: LE50CZ-AP

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LE50CZ-AP.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:3,679

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Product details

Overview

LE50CZ-AP from STMicroelectronics is a 5.0 V fixed-output, very low-dropout linear voltage regulator in TO-92 package, delivering up to 100 mA with 0.2 V typical dropout at full load, 50 µA quiescent current in OFF mode, ±2% output 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-AP datasheet, LE50CZ-AP pinout, LE50CZ-AP application, or LE50CZ-AP equivalent, key selection criteria include dropout voltage under 100 mA load, shutdown current below 100 µA, thermal performance in TO-92 at 125 °C junction, stability with ≤2.2 µF ceramic output capacitor, and compatibility with legacy L78Lxx footprint layouts.

Technical Context

The LE50CZ-AP implements a PNP pass transistor architecture enabling ultra-low dropout (0.2 V typ. at 100 mA), with internal current limiting and thermal shutdown protection. Its inhibit function is disabled in TO-92 configuration-pin 3 (VIN) and pin 1 (VOUT) operate continuously without logic control.

Unlike SO-8 variants (e.g., LE50AB), the TO-92 version lacks an Inhibit pin and operates only in permanent ON mode. Output regulation relies on trimmed bandgap reference and error amplifier with 80 dB supply voltage rejection at 120 Hz, supporting stable 5.0 V rail generation from noisy or marginally regulated inputs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±2% at 25 °C - ensures compatible logic-level compliance for 5 V MCU I/O and analog sensors
Dropout Voltage	0.2 V typical at 100 mA - enables regulation from 5.2 V input, critical for single-cell LiFePO₄ or dual-cell alkaline systems
Quiescent Current	50 µA in OFF mode - not applicable to TO-92; actual operating current is 0.5 mA (ON mode, no load), minimizing standby drain
Max Output Current	100 mA continuous - sufficient for powering low-power MCUs (e.g., STM32L0), EEPROMs, and digital sensors
Input Voltage Range	2.5 V to 18 V - supports wide-input industrial supplies while maintaining regulation down to near-VOUT
Thermal Range	–40 to +125 °C junction - validated for under-hood automotive modules and industrial PLC I/O cards
Stability Capacitor	2.2 µF ceramic (ESR 0.1–10 Ω) - eliminates need for electrolytic capacitors, reducing board area and aging concerns

Pinout & Package

LE50CZ-AP uses the standard TO-92 plastic package (JEDEC TO-92AB), with lead frame thermally optimized for PCB copper pour heatsinking. Pin assignment is fixed: Pin 1 = VOUT, Pin 2 = GND, Pin 3 = VIN (bottom view).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (VOUT)	Regulated output terminal	Delivers stable 5.0 V to load; requires ≥2.2 µF ceramic bypass capacitor placed within 5 mm
Pin 2 (GND)	Reference and return path	Must connect directly to low-impedance ground plane; shared with input and output capacitor grounds
Pin 3 (VIN)	Unregulated input supply	Accepts 2.5–18 V DC; trace width ≥15 mil recommended for 100 mA continuous conduction

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
Low-noise regulation	50 µV RMS output noise (10 Hz–100 kHz) preserves signal integrity for ADC references and precision analog front-ends
High PSRR	80 dB at 120 Hz suppresses ripple from switching pre-regulators or noisy DC/DC converters upstream
Robust protection	Internal current limit (150 mA) and thermal shutdown prevent damage during short-circuit or overload events
Wide temperature range	Specified from –40 to +125 °C allows deployment in automotive engine compartments and industrial motor drives

Applications

Industrial Sensor Node

Automotive Body Control Module

Use Scenario: Low-power wireless temperature/humidity node powered by two AA batteries with BLE radio.

IC Role / Device Role / Timing Role: Primary 5 V LDO supplying MCU core, RF transceiver, and analog sensor interface.

Use Value: 0.2 V dropout extends battery life by enabling regulation until cell voltage drops to 5.2 V; 0.5 mA quiescent current minimizes sleep-mode drain.

Use Scenario: Interior lighting control unit mounted near door latch mechanism.

IC Role / Device Role / Timing Role: Local 5 V regulator for microcontroller and CAN transceiver logic supply.

Use Value: –40 to +125 °C rating ensures reliable startup at cold ambient and sustained operation near warm metal chassis; 80 dB PSRR rejects alternator ripple.

Medical Wearable Monitor

Smart Energy Meter

Use Scenario: Patch-style ECG monitor using coin-cell battery and ultra-low-power MCU.

IC Role / Device Role / Timing Role: Precision 5 V rail generator for op-amp signal conditioning and SAR ADC reference.

Use Value: 50 µV output noise prevents degradation of 12-bit+ analog measurements; ±2% tolerance guarantees consistent sensor excitation.

Use Scenario: DIN-rail mounted meter with isolated DC/DC converter feeding auxiliary 5 V rail.

IC Role / Device Role / Timing Role: Post-regulator cleaning switching noise before powering metrology ASIC and RTC.

Use Value: 2.2 µF ceramic stability requirement simplifies layout and avoids electrolytic capacitor lifetime limitations in 15-year field deployments.

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 at 800 mA; SOT-223 package; 1% initial accuracy	Higher current capability but larger footprint and higher minimum input voltage (6.15 V)	Select when >100 mA load or tighter initial accuracy is required; not drop-in due to package and pinout mismatch
TLV70550DBVR	0.3 V dropout at 200 mA; 35 µA quiescent current; SOT-23-5 with enable pin	Includes active-high enable and smaller footprint; lacks TO-92 mechanical compatibility	Prefer for space-constrained PCBs needing shutdown control; requires redesign for TO-92 socket replacement

Compared with LDL1117S50R and TLV70550DBVR, LE50CZ-AP uniquely balances TO-92 mechanical compatibility, ultra-low dropout at modest load, and proven industrial temperature reliability-making it optimal for legacy-replacement and cost-sensitive high-volume designs where footprint and thermal derating are primary constraints.

Availability

LE50CZ-AP is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, medical wearables, and smart energy meters requiring stable component supply with long lifecycle support.

Supply support for LE50CZ-AP 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, designing and manufacturing microcontrollers, power management ICs, and analog components for industrial, automotive, and consumer markets.

The LE series LDO regulators were developed specifically for low-power, high-reliability embedded systems requiring robust thermal performance and minimal external components-targeting battery-operated and harsh-environment applications.

FAQ

What is the maximum input voltage for LE50CZ-AP?

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 load, especially in TO-92 without heatsinking. Derating is required above 125 °C junction temperature per the datasheet's thermal resistance (R_thJA = 200 °C/W).

Does LE50CZ-AP have an enable or inhibit pin?

No. The TO-92 variant (LE50CZ-AP) has no inhibit function-it operates continuously in ON mode. Only SO-8 versions (e.g., LE50AB) feature Pin 5 as TTL-compatible Inhibit. For shutdown capability in TO-92 form factor, external MOSFET control of VIN is required.

Can LE50CZ-AP be used with ceramic output capacitors?

Yes-specifically 2.2 µF X5R/X7R ceramic capacitors with ESR between 0.1 Ω and 10 Ω. This eliminates electrolytics and improves reliability. Avoid NP0/C0G below 1 µF, as insufficient capacitance causes instability per Figure 29–31 in the datasheet.

How does LE50CZ-AP compare to the legacy L78L05?

LE50CZ-AP offers 0.2 V dropout (vs. ~1.7 V for L78L05), 0.5 mA quiescent current (vs. ~5.5 mA), and ±2% output tolerance (vs. ±5%). It is pin-to-pin compatible with L78L05 in TO-92, enabling direct replacement with immediate efficiency and thermal benefits-no layout change required.

LE50CZ-AP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Box (TB)

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-AP FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LE50CZ-AP?

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

Once your LE50CZ-AP 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-AP?

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

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

All LE50CZ-AP 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-AP meets industry standards.

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

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

Return procedure for LE50CZ-AP:

1.Submit a request within 90 days.

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

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