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

STMicroelectronics LE35CZ

Name: LE35CZ
Brand: STMicroelectronics
SKU: LE35CZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LE35CZ

Manufacturer:: STMicroelectronics

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

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

Datasheet:: LE35CZ.pdf

Description:: IC REG LINEAR 3.5V 100MA TO92-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,981

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Product details

Overview

LE35CZ from STMicroelectronics is a 3.5 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 rail regulator in battery-powered sensor nodes and portable instrumentation where ultra-low standby power and thermal robustness are critical.

For engineers reviewing the LE35CZ datasheet, LE35CZ pinout, LE35CZ application, or LE35CZ equivalent, key selection criteria include its 0.2 V dropout at 100 mA, 50 µA shutdown current, TO-92 thermal resistance (200 °C/W), 2.2 µF minimum stability capacitor, and compatibility with legacy L78Lxx footprint layouts.

Technical Context

The LE35CZ implements a PNP-based LDO architecture with internal current and thermal limiting, enabling stable regulation even under transient load steps and high ambient temperatures. Its inhibit function is absent in TO-92 configuration-device remains permanently enabled-distinguishing it from SO-8 variants that feature TTL-compatible shutdown on pin 5.

It achieves 79 dB supply voltage rejection at 120 Hz and maintains 50 µV RMS output noise (10 Hz–100 kHz) without requiring external bypass capacitors beyond the mandatory 2.2 µF ceramic output capacitor, simplifying layout for space-constrained PCBs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.5 V ±2% at 25 °C - ensures precise biasing for 3.3 V logic interfaces with margin for temperature drift
Dropout Voltage	0.2 V typ. @ 100 mA - enables regulation from 3.7 V input (e.g., single Li-ion cell) down to end-of-discharge
Quiescent Current	50 µA in OFF mode - negligible battery drain during system sleep; 0.5 mA in ON mode supports low-power always-on operation
Max Output Current	100 mA continuous - sufficient for microcontroller cores, analog sensors, and RF transceivers in compact edge devices
Stability Capacitor	2.2 µF ceramic (ESR 0.1–10 Ω) - eliminates need for tantalum or large electrolytics, reducing BOM cost and board area
Operating Temp	–40 to 125 °C junction - validated for under-hood automotive modules and industrial control enclosures
Supply Rejection	79 dB @ 120 Hz - suppresses ripple from switching pre-regulators or noisy DC-DC converters upstream

Pinout & Package

LE35CZ is supplied in TO-92 package (JEDEC TO-226AA), with leads formed for through-hole mounting and thermal performance optimized via copper pour on PCB. Pin 1 = V_OUT, Pin 2 = GND, Pin 3 = V_IN. No inhibit pin is present-device operates continuously when powered.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	V_OUT	Regulated 3.5 V output; connects directly to load IC V_CC rail and 2.2 µF decoupling capacitor
Pin 2	GND	Power ground reference; must tie to low-impedance system ground plane to minimize noise coupling
Pin 3	V_IN	Unregulated input (up to 18 V); requires local 0.1 µF ceramic filter before regulator input

Key Features

Feature	Design Value
Very low dropout	0.2 V typical at 100 mA enables single-cell Li-ion (3.0–4.2 V) direct regulation without pre-boost
Ultra-low quiescent current	50 µA in OFF mode extends shelf life of battery-powered IoT endpoints beyond 10 years
Thermal protection	Internal foldback current limit and thermal shutdown prevent damage during sustained overload or poor heatsinking
Minimal external components	Only two capacitors required (0.1 µF input + 2.2 µF output) - reduces bill-of-materials and layout complexity
High accuracy grade	±2% output tolerance over temperature ensures reliable ADC reference and analog sensor biasing

Applications

Wireless Sensor Node

Industrial Temperature Transmitter

Use Scenario: Battery-powered Zigbee/Bluetooth LE node measuring ambient temperature and humidity every 5 minutes.

IC Role / Device Role / Timing Role: Local 3.5 V regulator powering MCU, sensor ICs, and RF transceiver during active burst transmission.

Use Value: 50 µA OFF-mode current extends CR2032 battery life to >5 years; 0.2 V dropout allows operation until battery reaches 3.7 V.

Use Scenario: 4–20 mA loop-powered transmitter in chemical plant monitoring reactor temperature.

IC Role / Device Role / Timing Role: Secondary regulator deriving clean 3.5 V rail for precision RTD-to-digital converter and signal conditioning op-amps.

Use Value: 79 dB SVR rejects ripple from loop-powered DC-DC converter; 125 °C rating supports operation inside sealed junction boxes.

Portable Medical Pulse Oximeter

Automotive Cabin Air Quality Module

Use Scenario: Handheld oximeter using red/IR LEDs and photodiode amplifier, powered by two AAA alkaline cells.

IC Role / Device Role / Timing Role: Stable 3.5 V supply for analog front-end and low-power ARM Cortex-M0+ MCU during LED pulsing cycles.

Use Value: 2.2 µF ceramic capacitor minimizes board area; ±2% accuracy ensures consistent LED drive current calibration across production units.

Use Scenario: In-cabin CO₂/VOC sensor module mounted near HVAC duct, exposed to under-dash temperature extremes.

IC Role / Device Role / Timing Role: Primary LDO supplying 3.5 V to NDIR gas sensor, microcontroller, and CAN transceiver interface.

Use Value: –40 to 125 °C operating range meets AEC-Q100 Grade 2 requirements; internal thermal limit prevents latch-up during hot-soak conditions.

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
LE35ABZ	±1% output accuracy (vs. ±2% for LE35CZ), same TO-92 package and electrical specs	Required where tighter initial voltage tolerance is needed for high-precision ADC references	Select LE35ABZ when absolute output accuracy dominates cost sensitivity; otherwise LE35CZ offers optimal balance
LDL1135S	3.5 V output, 150 mA rated, SOT-23-5 package, 60 µA quiescent current, no thermal shutdown	Suitable for higher-current, surface-mount designs but lacks internal thermal protection and has higher shutdown current	Choose LDL1135S only if board space is constrained and thermal derating can be managed externally

Compared with LE35ABZ, LE35CZ trades 1% accuracy for lower cost and broader qualification; versus LDL1135S, it provides superior thermal safety and lower OFF-mode leakage at the expense of through-hole assembly and 100 mA limit.

Availability

LE35CZ is available at Aetrix Electronics and suitable for wireless sensor nodes, industrial transmitters, portable medical devices, and automotive cabin modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LE35CZ 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LE series LDO regulators were developed specifically for ultra-low-power, high-reliability embedded systems where battery longevity, thermal resilience, and minimal external components are design imperatives.

FAQ

What is the maximum input voltage for LE35CZ?

The absolute maximum DC input voltage is 20 V, but the recommended operating input range is 4.2 V to 18 V. Operation below 4.2 V risks dropout-output voltage collapses when (V_IN – V_OUT) falls below 0.5 V at 100 mA per datasheet Table 14. Input must exceed 4.0 V to guarantee regulation across temperature and load.

Does LE35CZ have an enable or shutdown pin?

No. The TO-92 variant (LE35CZ) has no inhibit function-it is permanently enabled. Only SO-8 versions (e.g., LE35C) include pin 5 for TTL-compatible shutdown. For ON/OFF control in TO-92 designs, an external PMOS high-side switch must be added upstream of V_IN.

Can LE35CZ replace older L78L33 or L78L35 regulators?

Yes-LE35CZ is pin-to-pin compatible with L78L35 in TO-92 and offers superior performance: 0.2 V dropout (vs. 1.7 V), 50 µA OFF current (vs. ~5.5 mA), and ±2% accuracy (vs. ±5%). However, verify input voltage headroom and thermal dissipation-LE35CZ's lower dropout reduces heat generation significantly.

What output capacitor ESR range is supported?

LE35CZ requires an output capacitor with ESR between 0.1 Ω and 10 Ω, and minimum capacitance of 2.2 µF. Ceramic X7R or C0G types meeting this ESR range are preferred. Tantalum capacitors may be used if ESR is verified within spec, but aluminum electrolytics are not recommended due to high ESR and aging effects.

LE35CZ 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):: 3.5V

Voltage - Output (Max):: -

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

Current - Output:: 100mA

Current - Quiescent (Iq):: 1 mA

Current - Supply (Max):: 3 mA

PSRR:: 80dB ~ 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

LE35CZ FAQ

1.How can I place an order for LE35CZ through Aetrix?

Please submit a Request for Quotation (RFQ) for LE35CZ 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 LE35CZ reliable?

The price and inventory of LE35CZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE35CZ is usually 5 days.

3.What payment methods are accepted for LE35CZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE35CZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LE35CZ?

LE35CZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LE35CZ 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 LE35CZ?

For technical support, including LE35CZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE35CZ requirements.

6.How does Aetrix verify that LE35CZ is sourced from the original manufacturer or authorized distributors?

All LE35CZ 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 LE35CZ meets industry standards.

7.What is the process for return or replacement of LE35CZ?

All LE35CZ units undergo pre-shipment inspection (PSI). If there is an issue with LE35CZ, 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 LE35CZ part is unused and in its original packaging.

Return procedure for LE35CZ:

1.Submit a request within 90 days.

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

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