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STMicroelectronics LE33CZ-AP
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- Part No.:
- LE33CZ-AP
- Manufacturer:
- STMicroelectronics
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LE33CZ-AP.pdf
- Description:
- IC REG LINEAR 3.3V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,810
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Product details
Overview
LE33CZ-AP from STMicroelectronics is a 3.3 V, ±2% tolerance, very low-dropout linear voltage regulator in TO-92 Ammopack packaging with 100 mA output capability, 0.2 V typical dropout at full load, and 50 µA typical quiescent current in OFF mode - designed for battery-powered, low-noise local regulation where space and standby power are critical.
For engineers reviewing the LE33CZ-AP datasheet, LE33CZ-AP pinout, LE33CZ-AP application, or LE33CZ-AP equivalent, this device serves as a drop-in replacement for L78L33 in legacy designs while offering superior dropout, lower IQ, and enhanced thermal performance in compact through-hole form.
Technical Context
The LE33CZ-AP implements a PNP-based LDO architecture with internal current and thermal limiting, enabling stable operation across –40 °C to +125 °C junction temperature. Its inhibit function is disabled in TO-92 configuration (always ON), distinguishing it from the SO-8 variant which features TTL-compatible shutdown on pin 5.
Stability requires only a 2.2 µF output capacitor with ESR between 0.1 Ω and 10 Ω, eliminating need for large electrolytics. Supply voltage rejection reaches 80 dB at 120 Hz, supporting clean power delivery in noise-sensitive analog and RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±2% at 25 °C - ensures compatibility with 3.3 V logic families under nominal conditions |
| Dropout Voltage | 0.2 V typ. @ 100 mA - enables regulation from 3.5 V input, critical for single-cell Li-ion or 3.7 V supply rails |
| Quiescent Current | 50 µA typ. in OFF mode - supports ultra-low-power sleep states in portable devices |
| Output Current | 100 mA continuous - sufficient for microcontrollers, sensors, and interface ICs in compact systems |
| Supply Rejection | 80 dB @ 120 Hz - suppresses ripple from switching converters upstream of this LDO |
| Operating Temp | –40 °C to +125 °C - qualified for automotive under-hood and industrial control environments |
| Capacitor Requirement | 2.2 µF ceramic output cap - reduces board area and cost vs. traditional 10 µF tantalum solutions |
Pinout & Package
LE33CZ-AP is supplied in TO-92 Ammopack packaging - a through-hole, three-terminal plastic package with standardized lead spacing (0.47 mm diameter leads, 2.54 mm pitch). The package provides 200 °C/W junction-to-ambient thermal resistance and is RoHS-compliant per ECOPACK® specifications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Input) | VIN | DC input supply rail (up to 18 V); must be decoupled with ≥0.1 µF ceramic near package |
| Pin 2 (Ground) | GND | Reference node for regulation and thermal path; connects internally to die attach pad in TO-92 |
| Pin 3 (Output) | VOUT | Regulated 3.3 V output; requires 2.2 µF ceramic capacitor (ESR 0.1–10 Ω) for stability |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout | 0.2 V typical at 100 mA - extends usable battery life by enabling regulation down to 3.5 V input |
| Low quiescent current | 50 µA in OFF mode - minimizes leakage during system sleep without external enable control |
| Internal protection | Thermal shutdown and current limiting - prevents damage during overload or ambient overheating |
| Stable with small capacitor | 2.2 µF ceramic output cap - eliminates need for polarized capacitors and simplifies layout |
| Precision output tolerance | ±2% over temperature - meets tight margin requirements for 3.3 V I/O and core logic supplies |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
|
Use Scenario: Low-power wireless sensor node powered by coin cell or energy harvester. IC Role / Device Role / Timing Role: Local 3.3 V regulator for MCU, RF transceiver, and analog front-end. Use Value: 50 µA OFF-mode current and 0.2 V dropout extend operational lifetime beyond 5 years on CR2032. |
Use Scenario: Powering LIN transceivers and door-lock actuators in 12 V vehicle electrical system. IC Role / Device Role / Timing Role: Post-regulator supplying clean 3.3 V to microcontroller peripherals. Use Value: 125 °C operating range and 80 dB PSRR ensure reliable operation near engine compartment heat sources. |
| Portable Medical Monitor | Smart Home Hub Controller |
|
Use Scenario: Battery-operated pulse oximeter requiring low-noise analog supply. IC Role / Device Role / Timing Role: Dedicated LDO for ADC reference and op-amp bias rails. Use Value: 50 µV RMS output noise (10 Hz–100 kHz) preserves signal integrity in sub-µV biomedical measurements. |
Use Scenario: Always-on Wi-Fi/BLE hub with deep-sleep firmware and wake-on-event capability. IC Role / Device Role / Timing Role: Standby power regulator for real-time clock and interrupt controller. Use Value: Stable 3.3 V output with ±2% tolerance ensures accurate timing and reliable wake-up detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LE33CD-TR | Same 3.3 V/±2% spec, but in SO-8 tape-and-reel; includes active-low INHIBIT pin (pin 5) | Enables software-controlled power gating in PCBs with space for surface-mount layout | Select when board design supports SMT and requires programmable shutdown capability |
| L78L33ACZ | Fixed 3.3 V, ±3% tolerance; no inhibit; higher 1.7 V dropout; 5.5 mA quiescent current | Limited to non-battery, non-noise-critical applications due to higher dropout and IQ | Select only for cost-sensitive, non-portable legacy designs where footprint compatibility is mandatory |
Compared with LE33CD-TR, LE33CZ-AP trades programmable shutdown for TO-92 through-hole reliability and lower standby current; versus L78L33ACZ, it delivers 34× lower quiescent current and 8.5× lower dropout - directly extending battery runtime and enabling tighter input voltage margins.
Availability
LE33CZ-AP is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, portable medical monitors, and smart home hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LE33CZ-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, Switzerland, designing and manufacturing products for automotive, industrial, and consumer markets with emphasis on energy efficiency and reliability.
The LEXX series was developed to replace legacy 78L regulators with modern LDO performance - targeting battery-powered, space-constrained, and thermally demanding applications where dropout, quiescent current, and stability matter most.
FAQ
Is LE33CZ-AP pin-compatible with L78L33?
Yes - LE33CZ-AP uses the same TO-92 pinout (Input-Ground-Output) as L78L33 and is a direct functional replacement. It maintains identical mechanical footprint and soldering profile, enabling drop-in upgrades without PCB redesign.
Does LE33CZ-AP require an input bypass capacitor?
Yes - a minimum 0.1 µF ceramic capacitor must be placed between VIN and GND, within 5 mm of the package, to prevent oscillation and ensure transient response stability during load steps.
What is the maximum input voltage for LE33CZ-AP?
The absolute maximum DC input voltage is 20 V, but the recommended operating range is up to 18 V at 100 mA output. Exceeding 18 V increases thermal stress and reduces reliability, especially above 85 °C ambient.
Can LE33CZ-AP be used without the output capacitor?
No - the device requires a minimum 2.2 µF ceramic output capacitor with ESR between 0.1 Ω and 10 Ω for closed-loop stability. Omitting it causes sustained oscillation and potential damage to downstream circuitry.
LE33CZ-AP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- 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-AP FAQ
1.How can I place an order for LE33CZ-AP through Aetrix?
Please submit a Request for Quotation (RFQ) for LE33CZ-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 LE33CZ-AP reliable?
The price and inventory of LE33CZ-AP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE33CZ-AP is usually 5 days.
3.What payment methods are accepted for LE33CZ-AP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE33CZ-AP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LE33CZ-AP?
LE33CZ-AP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LE33CZ-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 LE33CZ-AP?
For technical support, including LE33CZ-AP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE33CZ-AP requirements.
6.How does Aetrix verify that LE33CZ-AP is sourced from the original manufacturer or authorized distributors?
All LE33CZ-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 LE33CZ-AP meets industry standards.
7.What is the process for return or replacement of LE33CZ-AP?
All LE33CZ-AP units undergo pre-shipment inspection (PSI). If there is an issue with LE33CZ-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 LE33CZ-AP part is unused and in its original packaging.
Return procedure for LE33CZ-AP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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