STMicroelectronics LE25ABD

Overview

LE25ABD from STMicroelectronics is a very low dropout (LDO) linear voltage regulator delivering 2.5 V ±1% output at up to 100 mA, with 0.2 V typical dropout at full load and 50 µA quiescent current in OFF mode. It features TTL-compatible inhibit control (pin 5 in SO-8), internal current/thermal limiting, and stable operation with only 2.2 µF output capacitance - optimized for battery-powered systems requiring ultra-low power and low-noise local regulation.

For engineers reviewing the LE25ABD datasheet, LE25ABD pinout, LE25ABD application, or LE25ABD equivalent, key selection criteria include its 0.2 V dropout at 100 mA, ±1% output accuracy over temperature, -40 to 125 °C operating range, SO-8 package with integrated heatsink flag, and precise ON/OFF logic control for system-level power sequencing.

Technical Context

The LE25ABD implements a PNP-based LDO architecture enabling ultra-low dropout while maintaining stability with minimal 2.2 µF ceramic output capacitance (ESR 0.1–10 Ω). Its inhibit input accepts TTL-level signals (V_IL ≤ 0.8 V, V_IH ≥ 2 V) to fully disable the regulator, reducing quiescent current to 50 µA.

It integrates thermal shutdown and foldback current limiting, supports input voltages up to 18 V, and achieves 82 dB supply voltage rejection at 120 Hz. The SO-8 package uses pins 2, 3, 6, and 7 internally connected to the die attach flag for enhanced thermal performance (R_thJA = 55 °C/W).

Key Specifications

Pinout & Package

LE25ABD is packaged in an SO-8 surface-mount package with pins 2, 3, 6, and 7 internally bonded to the exposed die attach flag for improved thermal dissipation (R_thJC = 20 °C/W). This modified SO-8 maintains standard footprint compatibility while enabling higher power handling on copper-heatsinked PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LDK220M25 and TLV70225, LE25ABD uniquely balances 100 mA capability, 0.2 V dropout, TTL-compatible inhibit, and SO-8 thermal performance - making it optimal for space-constrained, thermally demanding, and logic-sequenced embedded systems.

Availability

LE25ABD is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial IoT edge nodes, and low-power wireless transceivers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LE25ABD 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 designing and manufacturing microcontrollers, power management ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.

The LE series LDO regulators were developed specifically for ultra-low-power, high-accuracy local regulation in battery-critical and thermally constrained applications - emphasizing dropout minimization, logic controllability, and minimal external component count.

FAQ

What is the minimum input voltage required for LE25ABD to maintain regulation at 100 mA load?

The LE25ABD requires a minimum input voltage of 2.7 V to sustain 2.5 V output at 100 mA, based on its 0.2 V typical dropout voltage. At worst-case 0.5 V dropout (over temperature), input must be ≥3.0 V. Input voltage must not exceed 18 V per absolute maximum ratings.

Can LE25ABD be used without connecting the INHIBIT pin?

Yes - if the INHIBIT pin is left floating, the device defaults to ON mode. However, STMicroelectronics recommends grounding the pin when unused to prevent noise-induced toggling; this ensures stable operation without adding external pull-down resistors in most layouts.

Is the SO-8 package of LE25ABD compatible with standard SO-8 footprints?

Yes - the LE25ABD uses a modified SO-8 with identical external dimensions to JEDEC MS-012, but pins 2, 3, 6, and 7 are internally connected to the die attach flag. Standard SO-8 land patterns work, but optimal thermal performance requires connecting those pins to a large copper pour.

What output capacitor ESR range is supported for stable operation?

The LE25ABD is stable with output capacitors having ESR between 0.1 Ω and 10 Ω, as verified in the datasheet test conditions. A 2.2 µF X7R ceramic capacitor (typical ESR ~20 mΩ) meets this requirement and is recommended for minimal size, cost, and aging effects.