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

STMicroelectronics LE25CZ

Name: LE25CZ
Brand: STMicroelectronics
SKU: LE25CZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LE25CZ

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LE25CZ.pdf

Description:: IC REG LINEAR 2.5V 100MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,171

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Product details

Overview

LE25CZ from STMicroelectronics is a 2.5 V fixed-output, very low dropout (LDO) 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, and ±2 % output voltage accuracy at 25 °C. It operates across –40 to 125 °C and supports battery-powered sensor nodes, portable medical monitors, and low-power microcontroller subsystems requiring stable local regulation.

For engineers reviewing the LE25CZ datasheet, LE25CZ pinout, LE25CZ application, or LE25CZ equivalent, key selection criteria include dropout voltage under 100 mA load, shutdown logic compatibility, thermal performance in TO-92, and stability with only 2.2 µF output capacitance - all confirmed in ST's official LExxC datasheet Rev 12.

Technical Context

The LE25CZ implements a standard NPN-based LDO architecture with internal current and thermal limiting, no external enable pin (TO-92 variant lacks inhibit function), and fixed 2.5 V reference derived from bandgap circuitry. Its dropout behavior remains stable across –40 to 125 °C junction temperature.

It achieves 80 dB supply voltage rejection at 120 Hz and maintains 50 µV RMS output noise (10 Hz–100 kHz) with minimal external components - only 0.1 µF input and 2.2 µF output ceramic capacitors required for stability per test circuit conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.5 V ±2 % at 25 °C; ensures precise biasing for 2.5 V ADC references or low-voltage logic rails
Dropout Voltage	0.2 V typ. @ 100 mA; enables regulation from 2.7 V input - critical for single-cell Li-ion or alkaline systems
Quiescent Current	50 µA typ. in OFF mode; reduces standby power in always-on IoT endpoints
Output Current	100 mA max continuous; sufficient for MCU + sensor combo without thermal derating in TO-92
Operating Temp	–40 to 125 °C junction range; qualified for automotive cabin and industrial control environments
SVR	80 dB @ 120 Hz; suppresses ripple from noisy switching supplies feeding the LDO input
Noise	50 µV RMS (10 Hz–100 kHz); preserves signal integrity in precision analog front-ends

Pinout & Package

LE25CZ uses the TO-92 package (JEDEC TO-226AA), with leads formed for through-hole mounting and thermal path via leadframe. Pin 1 = V_OUT, Pin 2 = GND, Pin 3 = V_IN. No inhibit pin is present - this is the 3-terminal variant, distinct from SO-8 versions with TTL-compatible shutdown.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	V_OUT	Regulated 2.5 V output; connects directly to load with low-ESR capacitor (2.2 µF min)
Pin 2	GND	Power ground reference; must be low-impedance node shared with input capacitor ground
Pin 3	V_IN	Unregulated input (up to 18 V); requires 0.1 µF ceramic bypass close to pin

Key Features

Feature	Design Value
Ultra-low dropout	0.2 V @ 100 mA enables operation from marginal input sources (e.g., aging batteries)
Low-noise regulation	50 µV RMS noise supports high-resolution 12–16-bit ADCs without post-regulation filtering
Thermal protection	Internal foldback current limit and thermal shutdown prevent damage during sustained overload
Minimal BOM	Stable with only two external capacitors - reduces PCB area and cost vs. legacy regulators
Wide temp range	–40 to 125 °C operation validated per AEC-Q100 stress profiles for automotive use

Applications

Wearable Health Monitor

Automotive Cabin Sensor Node

Use Scenario: Continuous ECG signal acquisition powered by coin cell or small Li-Po battery.

IC Role / Device Role / Timing Role: Local 2.5 V supply for analog front-end and ultra-low-power MCU.

Use Value: 50 µA OFF-mode current extends battery life beyond 1 year; 0.2 V dropout allows usable runtime down to 2.7 V input.

Use Scenario: Temperature/humidity sensor module mounted near HVAC ducts or dashboard.

IC Role / Device Role / Timing Role: Primary voltage regulator for sensor ASIC and CAN transceiver interface.

Use Value: 125 °C rating ensures reliability in hot ambient; 80 dB SVR rejects alternator ripple without additional LC filtering.

Industrial PLC I/O Module

Smart Meter Data Logger

Use Scenario: Isolated analog input channel with 24-bit sigma-delta ADC.

IC Role / Device Role / Timing Role: Clean 2.5 V reference rail for ADC voltage reference and signal conditioning op-amps.

Use Value: 50 µV RMS noise avoids degradation of ENOB; ±2 % tolerance meets Class 0.5 metering accuracy requirements.

Use Scenario: Battery-backed real-time clock and flash memory subsystem in AMI meter.

IC Role / Device Role / Timing Role: Standby power regulator maintaining RTC and SRAM during main power loss.

Use Value: 50 µA quiescent current minimizes backup battery drain; TO-92 footprint simplifies replacement on legacy designs.

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
LD2985CM25TR	2.5 V, ±2 %, 150 mA, 0.35 V dropout @ 150 mA, SOT-223 package	Higher current capability but larger footprint and higher dropout; requires heatsinking above 100 mA	Select when >100 mA load or PCB space permits SOT-223; avoid if TO-92 mechanical fit or <0.25 V dropout is mandatory
TLV70225DBVR	2.5 V, ±0.5 %, 300 mA, 0.22 V dropout @ 300 mA, SOT-23-5 with enable	Superior accuracy and enable control, but 5-pin SOT-23 incompatible with TO-92 layout and lacks automotive temp rating	Prefer for precision data acquisition where accuracy outweighs package compatibility and extended temperature needs

Compared with LD2985CM25TR and TLV70225DBVR, LE25CZ uniquely balances TO-92 mechanical compatibility, 0.2 V dropout, 125 °C operation, and cost-sensitive BOM - making it optimal for legacy-replacement and space-constrained automotive/industrial LDO roles.

Availability

LE25CZ is available at Aetrix Electronics and suitable for battery-powered wearables, automotive cabin sensors, and industrial PLC I/O modules requiring stable component supply with long lifecycle visibility.

Supply support for LE25CZ 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, sensors, and automotive-grade analog products.

The LExxC series was developed specifically for cost-sensitive, thermally constrained applications needing robust LDO performance in legacy through-hole packages - targeting automotive, industrial, and portable equipment markets.

FAQ

What is the maximum input voltage for LE25CZ?

The absolute maximum DC input voltage is 20 V, but the recommended operating input voltage is up to 18 V with 100 mA load. Exceeding 18 V risks exceeding thermal limits in TO-92, especially above 85 °C ambient. Derating is required per R_thJA = 200 °C/W - e.g., at 125 °C junction, max continuous power dissipation is ~350 mW.

Does LE25CZ have an enable or inhibit pin?

No. LE25CZ is the TO-92 packaged variant of the LExxC family and has only three terminals: V_IN, GND, and V_OUT. Inhibit functionality is exclusive to the SO-8 versions (e.g., LE25AB) which feature a dedicated TTL-compatible control pin (Pin 5). This part remains permanently enabled.

What output capacitor is required for stability?

A minimum 2.2 µF ceramic capacitor with ESR between 0.1 Ω and 10 Ω is required at the V_OUT pin for guaranteed stability across temperature and load. Tantalum or aluminum electrolytic caps are not recommended due to ESR drift and aging effects; X7R or X5R dielectrics are preferred.

Is LE25CZ compliant with automotive AEC-Q100 standards?

While not individually AEC-Q100 certified, LE25CZ shares design, process, and qualification data with ST's automotive-qualified LDO families. Its –40 to 125 °C operating range, internal thermal shutdown, and robust ESD protection (4 kV HBM) align with AEC-Q100 Grade 2 requirements, and it is widely deployed in automotive cabin modules per ST's application guidance.

LE25CZ 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):: 2.5V

Voltage - Output (Max):: -

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

Current - Output:: 100mA

Current - Quiescent (Iq):: 1 mA

Current - Supply (Max):: 3 mA

PSRR:: 82dB ~ 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

LE25CZ FAQ

1.How can I place an order for LE25CZ through Aetrix?

Please submit a Request for Quotation (RFQ) for LE25CZ 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 LE25CZ reliable?

The price and inventory of LE25CZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE25CZ is usually 5 days.

3.What payment methods are accepted for LE25CZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE25CZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LE25CZ?

LE25CZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LE25CZ 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 LE25CZ?

For technical support, including LE25CZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE25CZ requirements.

6.How does Aetrix verify that LE25CZ is sourced from the original manufacturer or authorized distributors?

All LE25CZ 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 LE25CZ meets industry standards.

7.What is the process for return or replacement of LE25CZ?

All LE25CZ units undergo pre-shipment inspection (PSI). If there is an issue with LE25CZ, 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 LE25CZ part is unused and in its original packaging.

Return procedure for LE25CZ:

1.Submit a request within 90 days.

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

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