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STMicroelectronics LE33CZ
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- Part No.:
- LE33CZ
- Manufacturer:
- STMicroelectronics
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LE33CZ.pdf
- Description:
- IC REG LINEAR 3.3V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,324
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Product details
Overview
LE33CZ from STMicroelectronics is a 3.3 V fixed-output, very low dropout (0.2 V typ. at 100 mA) linear voltage regulator in TO-92 package, delivering up to 100 mA output current with ±2 % output voltage accuracy at 25 °C, 50 µA quiescent current in OFF mode, and operation across –40 to 125 °C - ideal for battery-powered microcontroller I/O rail regulation.
For engineers reviewing the LE33CZ datasheet, LE33CZ pinout, LE33CZ application, or LE33CZ equivalent, key selection considerations include dropout voltage under load, shutdown logic compatibility (not applicable in TO-92), thermal performance in ambient-constrained PCB layouts, and stability with minimal 2.2 µF output capacitance.
Technical Context
The LE33CZ implements a standard NPN-based series pass architecture with internal current and thermal limiting, no enable/inhibit pin in TO-92 configuration (always ON), and fixed 3.3 V reference derived from bandgap circuitry. It operates without external feedback components.
Its 80 dB supply voltage rejection at 120 Hz and 50 µV RMS output noise (10 Hz–100 kHz) support noise-sensitive analog and mixed-signal circuits. The device requires only 2.2 µF ceramic output capacitor with ESR between 0.1 Ω and 10 Ω for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±2 % at 25 °C; maintains regulation down to 0.2 V input-to-output differential at full 100 mA load. |
| Dropout Voltage | 0.2 V typical at 100 mA; enables operation with input as low as 3.5 V while sustaining 3.3 V output. |
| Quiescent Current | 0.5 mA typical in ON mode (no load); 50 µA in OFF mode - critical for standby power budgeting in portable systems. |
| Output Current | 100 mA continuous; internally current-limited to ~150 mA - sufficient for MCU cores, sensors, and logic rails. |
| Supply Rejection | 80 dB at 120 Hz; attenuates ripple from upstream switching regulators or noisy DC sources before sensitive loads. |
| Operating Temperature | –40 to 125 °C junction range; supports automotive under-hood and industrial control environments. |
| Stability Capacitor | 2.2 µF ceramic (ESR 0.1–10 Ω); eliminates need for larger electrolytics, reducing board area and cost. |
Pinout & Package
LE33CZ is supplied in TO-92 package (JEDEC TO-226AA), with leads formed for through-hole mounting. Thermal resistance is 200 °C/W junction-to-ambient; copper pour on PCB is recommended for sustained 100 mA operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | VOUT | Regulated 3.3 V output; connects directly to load and bypass capacitor. |
| Pin 2 | GND | Power ground reference; must be low-impedance connection to minimize noise coupling. |
| Pin 3 | VIN | Unregulated input (up to 18 V); requires local 0.1 µF ceramic decoupling per datasheet test circuit. |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout | 0.2 V typical at 100 mA enables use with single-cell Li-ion (3.0–3.6 V) or 3.3 V backplane inputs. |
| Low quiescent current | 50 µA in OFF mode reduces battery drain during system sleep - essential for >1-year coin-cell lifetime. |
| Internal protection | Thermal shutdown and current limiting prevent damage during overload or ambient temperature rise. |
| Minimal external components | Only two capacitors required (0.1 µF input + 2.2 µF output); simplifies layout and BOM for space-constrained designs. |
| Wide temperature range | –40 to 125 °C operation supports deployment in automotive body control modules and industrial PLCs. |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Remote temperature/humidity sensor powered by CR2032 coin cell with 10-year target lifetime. IC Role / Device Role / Timing Role: Primary 3.3 V LDO supplying MCU, RF transceiver, and analog front-end. Use Value: 50 µA OFF-mode current extends battery life; 0.2 V dropout allows usable runtime down to 3.2 V cell voltage. |
Use Scenario: Door module with LIN interface, LED drivers, and position sensors in passenger compartment. IC Role / Device Role / Timing Role: Local 3.3 V regulator for microcontroller I/O and CAN transceiver bias rails. Use Value: –40 to 125 °C rating ensures reliability across cabin temperature extremes; 80 dB SVR suppresses alternator ripple. |
| Portable Medical Monitor | Smart Home Hub MCU Rail |
Use Scenario: Battery-backed pulse oximeter with OLED display and Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Clean 3.3 V supply for ADC reference, op-amps, and BLE SoC digital core. Use Value: 50 µV RMS output noise prevents signal degradation in analog measurement path; 2.2 µF stability enables ultra-thin PCB stackup. |
Use Scenario: Wi-Fi/BLE hub using dual-core MCU with integrated peripherals and USB interface. IC Role / Device Role / Timing Role: Secondary 3.3 V rail for USB PHY, GPIO expander, and external flash memory. Use Value: Pin-to-pin compatibility with legacy L78L33 simplifies redesign; ±2 % tolerance meets USB 2.0 VBUS tolerance requirements. |
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 |
|---|---|---|---|
| LD33CV | Same 3.3 V output, TO-92, ±2 % accuracy, but higher 1.2 V dropout at 100 mA and 4 mA quiescent current in ON mode. | Lacks low-dropout capability; unsuitable for <3.6 V input sources like Li-ion or energy-harvesting systems. | Select LD33CV only when input voltage ≥4.5 V and ultra-low IQ is not required. |
| TLV73333PDBVR | 3.3 V, SOT-23-5, 170 mA output, 0.22 V dropout at 300 mA, 40 µA IQ - but requires external enable and has different pinout. | Enables active sequencing and remote ON/OFF control; incompatible with TO-92 footprint or legacy L78Lxx layouts. | Choose TLV73333PDBVR for new designs needing enable control and higher current, not drop-in replacement. |
Compared with LD33CV, LE33CZ delivers significantly lower dropout and quiescent current for battery longevity; versus TLV73333PDBVR, it offers direct TO-92 compatibility and zero external control complexity at the cost of programmability and higher current headroom.
Availability
LE33CZ is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, portable medical monitors, and smart home hub designs requiring stable component supply with long lifecycle visibility.
Supply support for LE33CZ 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The LE series targets ultra-low-power, high-reliability linear regulation in cost-sensitive, space-constrained applications - emphasizing dropout minimization, thermal robustness, and simplified bill-of-materials.
FAQ
Is LE33CZ pin-compatible with the L78L33?
Yes, LE33CZ is pin-to-pin compatible with the legacy L78L33 in TO-92 package. Both share identical pin 1 (VOUT), pin 2 (GND), pin 3 (VIN) assignment and mechanical outline, enabling direct replacement without PCB modification.
Does LE33CZ support shutdown or inhibit functionality?
No - LE33CZ in TO-92 configuration has no inhibit pin and remains permanently enabled. Inhibit logic (TTL-compatible) is only available on SO-8 variants (e.g., LE33AB) via pin 5; TO-92 devices operate continuously when powered.
What is the minimum input voltage required for 3.3 V regulation at 100 mA?
The minimum input voltage is 3.5 V, based on the typical 0.2 V dropout voltage at 100 mA load. At worst-case 0.5 V dropout (over temperature), input must be ≥3.8 V to maintain regulation under full load and extreme ambient conditions.
Can LE33CZ be used with ceramic output capacitors?
Yes - LE33CZ is explicitly characterized for stability with 2.2 µF ceramic capacitors having ESR between 0.1 Ω and 10 Ω. This eliminates electrolytic capacitors, improving reliability and reducing footprint in compact designs.
LE33CZ 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):
- 3.3V
- 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
LE33CZ FAQ
1.How can I place an order for LE33CZ through Aetrix?
Please submit a Request for Quotation (RFQ) for LE33CZ 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 LE33CZ reliable?
The price and inventory of LE33CZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE33CZ is usually 5 days.
3.What payment methods are accepted for LE33CZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE33CZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LE33CZ?
LE33CZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LE33CZ 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 LE33CZ?
For technical support, including LE33CZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE33CZ requirements.
6.How does Aetrix verify that LE33CZ is sourced from the original manufacturer or authorized distributors?
All LE33CZ 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 LE33CZ meets industry standards.
7.What is the process for return or replacement of LE33CZ?
All LE33CZ units undergo pre-shipment inspection (PSI). If there is an issue with LE33CZ, 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 LE33CZ part is unused and in its original packaging.
Return procedure for LE33CZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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