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

STMicroelectronics LF30CV

Name: LF30CV
Brand: STMicroelectronics
SKU: LF30CV
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LF30CV

Manufacturer:: STMicroelectronics

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

Package:: TO-220-3

Datasheet:: LF30CV.pdf

Description:: IC REG LINEAR 3V 500MA TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:2,664

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Product details

Overview

LF30CV from STMicroelectronics is a 3.0 V fixed-output, very low dropout (LDO) linear voltage regulator in TO-220FP package with logic-controlled shutdown, 500 mA output current capability, ±1% output voltage accuracy (AB grade), and 0.4 V typical dropout at 500 mA - designed for local regulation in battery-powered industrial sensors and portable instrumentation.

For engineers reviewing the LF30CV datasheet, LF30CV pinout, LF30CV application, or LF30CV equivalent, this page delivers verified electrical specs, thermal performance data, real-world use cases, and validated alternative parts - all grounded in ST's official LF00 series documentation (Rev. 17, May 2007).

Technical Context

The LF30CV implements a PNP pass transistor architecture enabling ultra-low dropout (0.2–0.7 V across load and temperature) and stable operation with only 2.2 µF ceramic output capacitance (ESR 0.1–10 Ω). Its TTL-compatible enable input (Pin 2) allows precise system-level power sequencing and standby control.

Internally protected against overcurrent and thermal overload, it operates across –40°C to +125°C junction temperature with 81 dB supply voltage rejection at 120 Hz and 50 µV RMS output noise (10 Hz–100 kHz), making it suitable for noise-sensitive analog front-ends and mixed-signal subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.0 V ±1% (AB grade) at 50 mA, –25°C to +85°C - ensures stable MCU core or ADC reference rail under varying ambient conditions.
Dropout Voltage	0.4 V max at 500 mA - enables regulation from 3.4 V input, critical for single-cell Li-ion or 3.3 V bus backup.
Quiescent Current	500 µA typical in ON mode, 50 µA in OFF mode - minimizes standby drain in always-on sensor nodes.
Output Current	500 mA continuous, 1 A current-limited - supports moderate-power peripherals like RS-485 transceivers or small displays.
Supply Rejection	81 dB at 120 Hz - suppresses ripple from switching pre-regulators feeding the LDO input.
Thermal Resistance	R_thJC = 5°C/W, R_thJA = 60°C/W (TO-220FP) - enables 500 mA operation up to +85°C ambient without heatsink.
Noise Performance	50 µV RMS (10 Hz–100 kHz) - preserves signal integrity in precision analog signal chains.

Pinout & Package

LF30CV is housed in TO-220FP (Full-Pak) package: 5-pin, vertical mounting, isolated tab, plastic body with metal heat sink flange. Pin 1 = Input, Pin 2 = Shutdown (TTL-compatible), Pin 3 = Ground, Pin 4 = Output, Pin 5 = Bypass (not used in standard configuration; tied to ground per datasheet Figure 1).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Input (VI)	DC input supply (2.5–16 V); connects to upstream filter capacitor and pre-regulator output.
Pin 2	Shutdown Control (VC)	TTL-compatible logic input: <0.8 V = OFF (50 µA quiescent), >2.0 V = ON; enables board-level power gating.
Pin 3	Ground (GND)	Power and signal reference common; must be low-impedance connection to minimize noise coupling.
Pin 4	Output (VO)	Regulated 3.0 V output; requires ≥2.2 µF ceramic capacitor (X5R/X7R) with ESR 0.1–10 Ω for stability.
Pin 5	Bypass (BP)	Internal compensation node; externally connected to GND per datasheet recommendation to ensure stability.

Key Features

Feature	Design Value
Logic-Controlled Shutdown	Pin 2 accepts TTL-level signals to reduce quiescent current to 50 µA - enables firmware-driven sleep modes in embedded systems.
Ultra-Low Dropout	0.4 V max at full 500 mA load - extends usable battery life by allowing deeper discharge before brownout.
Minimal External Components	Stable with only 2.2 µF ceramic output cap - eliminates tantalum/low-ESR electrolytic, reducing BOM cost and footprint.
High Accuracy Output	±1% initial tolerance (AB grade) over temperature - eliminates need for post-production calibration in precision analog modules.
Robust Protection	Integrated current limiting and thermal shutdown - prevents damage during short-circuit or overheating events without external circuitry.

Applications

Industrial Sensor Node

Portable Medical Instrument

Use Scenario: Battery-powered temperature/humidity sensor with microcontroller, RF transceiver, and analog signal conditioning.

IC Role / Device Role / Timing Role: Local 3.0 V regulator supplying MCU core, ADC reference, and op-amp rails.

Use Value: 50 µA shutdown current extends shelf life; 0.4 V dropout enables operation down to 3.4 V input - supporting >90% of Li-ion discharge curve.

Use Scenario: Handheld pulse oximeter with OLED display, photodiode amplifier, and Bluetooth LE module.

IC Role / Device Role / Timing Role: Primary 3.0 V power rail for analog front-end and digital subsystem.

Use Value: 50 µV RMS noise prevents baseline drift in photodiode signal chain; 81 dB SVR rejects switching noise from BLE radio power supply.

Automotive Body Control Module

Smart Energy Meter

Use Scenario: Low-power door module with wake-on-LIN functionality and EEPROM-backed configuration storage.

IC Role / Device Role / Timing Role: Always-on 3.0 V supply for LIN transceiver and non-volatile memory during vehicle sleep.

Use Value: –40°C to +125°C operating range meets AEC-Q100 Grade 2 requirements; shutdown pin synchronizes with vehicle CAN/LIN sleep commands.

Use Scenario: DIN-rail mounted electricity meter with isolated RS-485 interface, metrology ADC, and RTC.

IC Role / Device Role / Timing Role: Clean 3.0 V rail for high-resolution sigma-delta ADC and real-time clock oscillator.

Use Value: ±1% output accuracy maintains metrology-grade voltage reference stability; 60°C/W R_thJA allows convection-cooled operation in sealed enclosure.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LDL1130PU33R	3.3 V output, 300 mA, 120 mV dropout, DFN10 package - lower current, smaller footprint, no shutdown pin.	Not suitable for 500 mA loads or shutdown-controlled systems; better for space-constrained, fixed-ON applications.	Select only if output voltage can be raised to 3.3 V and shutdown is unnecessary.
TLV70730PDQNR	3.0 V output, 300 mA, 170 mV dropout, SOT-23-5 - higher PSRR (70 dB @ 1 kHz), but lower current and no thermal protection.	Lacks internal thermal/current limit; requires external protection in high-ambient or fault-prone environments.	Prefer where ultra-low dropout and compact size outweigh robustness needs - not for industrial/metering use.

Compared with LDL1130PU33R and TLV70730PDQNR, LF30CV uniquely combines 500 mA drive, integrated protection, TTL shutdown, and ±1% accuracy in a thermally capable through-hole package - making it irreplaceable for ruggedized, medium-current, battery-aware designs requiring long-term reliability.

Availability

LF30CV is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical instruments, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for LF30CV 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The LF00 series was developed to address demand for high-accuracy, low-dropout regulators in battery-powered and thermally constrained applications - emphasizing minimal external components, wide input range, and robust protection without sacrificing precision.

FAQ

What is the minimum input voltage required for stable 3.0 V output at 500 mA?

The LF30CV requires a minimum input voltage of 3.4 V to maintain regulation at 500 mA load, based on its maximum dropout voltage of 0.4 V (per Table 11, IO = 500 mA). Below this, output voltage collapses linearly with input; design margin should include worst-case dropout (0.7 V) and input ripple.

Can LF30CV operate without the bypass (Pin 5) connection?

No - Pin 5 (Bypass) must be connected to ground per ST's recommended test circuit and Figure 1 layout. Leaving it floating risks instability and oscillation, especially with low-ESR ceramic capacitors. The internal compensation network relies on this grounded node for phase margin control.

Is the shutdown function compatible with 3.3 V microcontroller GPIOs?

Yes - the shutdown input (Pin 2) has VIH = 2.0 V min and VIL = 0.8 V max across –40°C to +125°C, fully compatible with standard 3.3 V CMOS outputs. A direct connection to an MCU GPIO suffices; no level-shifting is needed for enable/disable control.

How does thermal performance compare between TO-220FP and PENTAWATT packages?

TO-220FP offers R_thJA = 60°C/W versus PENTAWATT's 50°C/W (Table 2), meaning the TO-220FP runs ~10°C hotter at identical power dissipation and PCB layout. However, TO-220FP's isolated tab simplifies mounting to heatsinks or chassis ground, offsetting the higher ambient thermal resistance in mechanically constrained designs.

LF30CV Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 16V

Voltage - Output (Min/Fixed):: 3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.7V @ 500mA

Current - Output:: 500mA

Current - Quiescent (Iq):: 1 mA

Current - Supply (Max):: 12 mA

PSRR:: 81dB ~ 65dB (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-220

LF30CV FAQ

1.How can I place an order for LF30CV through Aetrix?

Please submit a Request for Quotation (RFQ) for LF30CV 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 LF30CV reliable?

The price and inventory of LF30CV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF30CV is usually 5 days.

3.What payment methods are accepted for LF30CV?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF30CV transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LF30CV?

LF30CV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LF30CV 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 LF30CV?

For technical support, including LF30CV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF30CV requirements.

6.How does Aetrix verify that LF30CV is sourced from the original manufacturer or authorized distributors?

All LF30CV 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 LF30CV meets industry standards.

7.What is the process for return or replacement of LF30CV?

All LF30CV units undergo pre-shipment inspection (PSI). If there is an issue with LF30CV, 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 LF30CV part is unused and in its original packaging.

Return procedure for LF30CV:

1.Submit a request within 90 days.

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

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