STMicroelectronics LF30ABPT

Overview

LF30ABPT from STMicroelectronics is a 3.0 V fixed-output, very low dropout (LDO) linear voltage regulator in TO-220FP package with logic-controlled shutdown, delivering up to 500 mA output current, 0.4 V typical dropout at 500 mA, ±1% output voltage accuracy at 25°C, and operation across –40°C to +125°C junction temperature.

For engineers reviewing the LF30ABPT datasheet, LF30ABPT pinout, LF30ABPT application, or LF30ABPT equivalent, this device is selected for battery-powered systems requiring ultra-low quiescent current (50 µA in OFF mode), stable local regulation with minimal external capacitance (2.2 µF), and precise 3.0 V rail generation under variable load and input conditions.

Technical Context

The LF30ABPT implements a PNP pass transistor architecture enabling sub-0.5 V dropout performance at full load, combined with internal current and thermal limiting for robust fault protection. Its TTL-compatible enable input (pin 2) allows system-level power sequencing and standby control without external circuitry.

It achieves 81 dB supply voltage rejection at 120 Hz and maintains low output noise (50 µV RMS, 10 Hz–100 kHz), making it suitable for noise-sensitive analog and mixed-signal circuits where input ripple or switching noise must be tightly suppressed.

Key Specifications

Pinout & Package

LF30ABPT is housed in a 5-pin TO-220FP package with exposed tab (heat sink). Pin 1: Input (VI), Pin 2: Shutdown Control (TTL-compatible active-high), Pin 3: Ground (GND), Pin 4: Output (VO), Pin 5: Bypass (BP) - used for noise filtering and stability enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LDL1130PU30R and TLV73330PDBVR, LF30ABPT offers higher output current (500 mA), integrated shutdown control, and a dedicated bypass pin for noise optimization-making it uniquely suitable for industrial and automotive applications demanding robustness, configurability, and thermal headroom.

Availability

LF30ABPT is available at Aetrix Electronics and suitable for portable medical devices, automotive body electronics, industrial PLC modules, and smart meter communication subsystems requiring stable component supply with long-term manufacturability and extended temperature support.

Supply support for LF30ABPT 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 silicon solutions for automotive, industrial, power, and embedded applications.

The LF00 series was developed specifically for ultra-low-dropout, low-quiescent-current regulation in battery-powered and thermally constrained systems - emphasizing reliability, minimal external components, and wide operating temperature compliance.

FAQ

What is the minimum input voltage required for regulation at full 500 mA load?

The minimum input voltage is calculated as VO + Vd = 3.0 V + 0.7 V = 3.7 V (max dropout at 500 mA per datasheet Table 11). For guaranteed regulation across temperature and process variation, design with ≥4.0 V input - matching the specified 4.0 V minimum operating input voltage in electrical characteristics.

Can LF30ABPT be used without connecting the Bypass (Pin 5) terminal?

Yes - Pin 5 (Bypass) is optional. Leaving it open or connecting it directly to VO maintains basic regulation and stability with the required 2.2 µF output capacitor. However, adding a 10 nF capacitor from Pin 5 to VO improves high-frequency PSRR and reduces output noise above 10 kHz, especially beneficial in RF or precision analog applications.

Does the shutdown function disconnect the output from ground or simply disable the pass element?

The shutdown function disables the internal pass transistor and places the output in high-impedance state - it does not actively discharge the output capacitor or short VO to GND. External bleed resistors may be needed to ensure rapid output discharge during shutdown if downstream circuitry requires fast rail collapse.

Is the TO-220FP package lead-free and RoHS-compliant?

Yes - LF30ABPT is manufactured in a RoHS-compliant, lead-free TO-220FP package per STMicroelectronics' standard product release. The device meets JEDEC J-STD-020 moisture sensitivity level MSL3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020D. Full compliance documentation is available in ST's official product change notifications.