Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics LE33ABD-TR

Name: LE33ABD-TR
Brand: STMicroelectronics
SKU: LE33ABD-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LE33ABD-TR

Manufacturer:: STMicroelectronics

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

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LE33ABD-TR.pdf

Description:: IC REG LINEAR 3.3V 100MA 8SO

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,457

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LE33ABD-TR from STMicroelectronics is a 3.3 V fixed-output, very low dropout (0.2 V typ.) linear voltage regulator in SO-8 package with TTL-compatible inhibit control (pin 5), delivering up to 100 mA output current, ±1% output voltage accuracy at 25 °C, and operating across –40 to 125 °C for automotive and industrial power management.

For engineers reviewing the LE33ABD-TR datasheet, LE33ABD-TR pinout, LE33ABD-TR application, or LE33ABD-TR equivalent, this device is selected for low-noise, battery-sensitive systems requiring precise 3.3 V rail generation with active power gating and minimal external capacitance (2.2 µF).

Technical Context

The LE33ABD-TR integrates an internal current-limit and thermal shutdown circuit, enabling robust operation under overload or elevated temperature conditions without external protection components. Its inhibit logic accepts TTL-level signals on pin 5, allowing full ON/OFF control of the output with <100 µA OFF-mode quiescent current.

Designed as a pin-to-pin upgrade to the legacy L78L33, it maintains compatibility while improving dropout performance and stability margin-requiring only 2.2 µF output capacitor with ESR between 0.1 Ω and 10 Ω, eliminating need for large electrolytic or tantalum capacitors.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.3 V ±1% at 25 °C; ensures stable microcontroller I/O and logic rail within tight tolerance for 3.3 V systems.
Dropout Voltage	0.2 V typical at 100 mA; enables regulation from 3.5 V input, critical for single-cell Li-ion or 3.7 V supply designs.
Quiescent Current	0.5 mA typical in ON mode, 50 µA in OFF mode; minimizes standby power loss in always-on subsystems.
Supply Voltage Rejection	80 dB at 120 Hz; suppresses ripple from upstream switching converters feeding the LDO input.
Operating Temperature	–40 to 125 °C junction range; qualified for under-hood automotive and industrial control environments.
Output Capacitance	2.2 µF minimum ceramic; reduces PCB area and cost versus legacy 10–22 µF requirements.
Thermal Resistance	R_thJA = 55 °C/W (SO-8); supports 100 mA continuous load with moderate copper pour on PCB.

Pinout & Package

LE33ABD-TR is housed in an 8-pin SO-8 package with pins 2, 3, 6, and 7 internally connected to the die attach flag for enhanced thermal dissipation. The package footprint matches standard SO-8 but features modified internal frame for lower thermal resistance.

Pin/Terminal	Circuit Role	Design Meaning
1	V_OUT	Regulated 3.3 V output; connects directly to load and bypass capacitor.
2	GND	Power ground; electrically tied to die flag for low-impedance return path.
3	V_IN	Input supply (up to 18 V); requires local decoupling near pin.
4	GND	Second ground terminal; improves noise immunity and current sharing with pin 2.
5	INH (Inhibit)	TTL-compatible enable/disable control; low = OFF, high = ON; floating defaults to ON.
6	GND	Third ground terminal; enhances thermal conduction and reduces ground bounce.
7	GND	Fourth ground terminal; part of integrated thermal flag structure.
8	V_IN	Second input terminal; parallel path to pin 3 for lower trace resistance and improved PSRR.

Key Features

Feature	Design Value
Very low dropout voltage	0.2 V typical at 100 mA enables operation from marginal input rails (e.g., 3.5 V) without dropout.
TTL-compatible inhibit control	Pin 5 accepts 0.8 V/2.0 V logic thresholds, enabling direct interface with MCU GPIOs for dynamic power gating.
±1% output accuracy	Guaranteed over temperature and line/load, reducing need for post-regulation trimming in precision analog or ADC reference circuits.
Stable with 2.2 µF ceramic capacitor	Eliminates reliance on polarized capacitors, lowering BOM cost and improving reliability in wide-temp applications.
Integrated protection	Current limit and thermal shutdown prevent damage during short-circuit or overheating-no external components required.

Applications

Automotive Body Control Module

Industrial Sensor Node

Use Scenario: Powering CAN transceiver and microcontroller in door module with 12 V battery input subject to load dump and cold cranking.

IC Role / Device Role / Timing Role: Local 3.3 V regulator with inhibit control synchronized to vehicle sleep/wake cycle.

Use Value: 50 µA OFF-mode current extends battery life during vehicle off-state; 125 °C rating ensures operation near engine compartment heat sources.

Use Scenario: Supplying ultra-low-power environmental sensor (temperature/humidity) and BLE SoC in wireless field transmitter.

IC Role / Device Role / Timing Role: Primary 3.3 V rail generator with dynamic ON/OFF toggling via host MCU to minimize average system current.

Use Value: 0.2 V dropout allows use of partially discharged Li-SOCl₂ primary cell (down to 3.5 V); 2.2 µF ceramic cap enables compact 2-layer PCB design.

Medical Wearable Monitor

POS Terminal Power Management

Use Scenario: Regulating power for ECG front-end amplifier and low-power ARM Cortex-M0+ processor in battery-operated patch monitor.

IC Role / Device Role / Timing Role: Precision 3.3 V analog supply with low noise (50 µV RMS) and tight initial accuracy for signal chain integrity.

Use Value: ±1% output tolerance and 80 dB SVR preserve ADC effective resolution; 0.5 mA ON-mode IQ extends runtime per charge.

Use Scenario: Providing clean 3.3 V rail to EMV contactless reader IC and secure element in retail payment terminal.

IC Role / Device Role / Timing Role: Secondary regulated supply isolated from noisy 5 V main rail, with fast enable/disable for transaction power sequencing.

Use Value: Pin 5 inhibit allows synchronous power-up/down with card detection event; SO-8 thermal flag supports sustained 100 mA during RF burst transmission.

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
LDL113PU33R	3.3 V, 150 mA, 0.35 V dropout, 30 µA IQ, DFN-6 package	No inhibit pin; smaller footprint but no power-gating capability	Select when board space is constrained and dynamic enable is not required.
TLV73333PDBVR	3.3 V, 300 mA, 0.22 V dropout, 35 µA IQ, SOT-23-5 package	Includes enable pin but lacks ±1% grade; wider output tolerance (±2%)	Select when higher output current is needed and tighter initial accuracy is not critical.

Compared with LDL113PU33R and TLV73333PDBVR, LE33ABD-TR uniquely combines ±1% accuracy, TTL-compatible inhibit, SO-8 thermal performance, and 100 mA capability-making it optimal for automotive and industrial designs demanding precision, controllability, and ruggedness.

Availability

LE33ABD-TR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, medical wearables, and POS terminal power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LE33ABD-TR 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 microcontrollers, power management ICs, sensors, and automotive-grade analog devices.

The LE series LDO regulators target low-power, high-reliability applications in automotive, industrial, and medical systems where precision, thermal robustness, and functional safety margins are essential.

FAQ

What is the minimum input voltage required for stable 3.3 V output at 100 mA?

The LE33ABD-TR requires a minimum input voltage of 3.5 V to maintain regulation at 100 mA load, based on its 0.2 V typical dropout voltage. At worst-case 0.5 V dropout (over temperature), 3.8 V input is recommended for guaranteed operation across –40 to 125 °C.

Can the INH pin be left unconnected, and what happens if it is?

Yes, the INH pin may be left floating, and the device will default to ON mode. However, STMicroelectronics recommends grounding the pin when inhibit functionality is unused to prevent noise-induced false turn-off, especially in electrically noisy automotive or industrial environments.

Does LE33ABD-TR require an input capacitor, and if so, what value and type?

Yes-an input capacitor of ≥0.1 µF ceramic is required per the datasheet test circuit. It should be placed as close as possible to pins 3 and 8 (V_IN) to suppress high-frequency noise and stabilize the regulator during transient load steps.

How does the SO-8 thermal design differ from standard SO-8 packages?

The LE33ABD-TR's SO-8 uses a modified leadframe where pins 2, 3, 6, and 7 are internally bonded to the die attach flag, reducing R_thJA to 55 °C/W. This allows higher continuous current (100 mA) with modest PCB copper area, unlike standard SO-8 packages limited to ~50 mA under same conditions.

LE33ABD-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

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:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

LE33ABD-TR FAQ

1.How can I place an order for LE33ABD-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for LE33ABD-TR 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 LE33ABD-TR reliable?

The price and inventory of LE33ABD-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LE33ABD-TR is usually 5 days.

3.What payment methods are accepted for LE33ABD-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LE33ABD-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LE33ABD-TR?

LE33ABD-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LE33ABD-TR 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 LE33ABD-TR?

For technical support, including LE33ABD-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LE33ABD-TR requirements.

6.How does Aetrix verify that LE33ABD-TR is sourced from the original manufacturer or authorized distributors?

All LE33ABD-TR 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 LE33ABD-TR meets industry standards.

7.What is the process for return or replacement of LE33ABD-TR?

All LE33ABD-TR units undergo pre-shipment inspection (PSI). If there is an issue with LE33ABD-TR, 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 LE33ABD-TR part is unused and in its original packaging.

Return procedure for LE33ABD-TR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…