STMicroelectronics L7824ABD2T

Overview

L7824ABD2T from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 24 V output at up to 1.5 A, featuring thermal overload protection, short-circuit protection, and safe operating area (SOA) protection. It operates across –40 °C to +125 °C junction temperature range and maintains ±2 % output voltage tolerance, making it suitable for industrial power supplies and embedded control systems requiring stable local regulation.

For engineers reviewing the L7824ABD2T datasheet, L7824ABD2T pinout, L7824ABD2T application, or L7824ABD2T equivalent, key selection criteria include dropout voltage (2 V @ 1 A), load regulation (≤100 mV over 5 mA–1 A), supply voltage rejection (54 dB @ 120 Hz), quiescent current (4.6–6 mA), and thermal resistance (R_thJC = 5 °C/W in TO-220FP package).

Technical Context

This device implements a monolithic series-pass linear regulator architecture with internal current limiting, thermal shutdown, and SOA protection-enabling robust operation without external protection circuitry. Its fixed 24 V output is trimmed during manufacturing to meet ±2 % tolerance over temperature and load.

The L7824ABD2T requires minimum 5 mA load current for regulation stability and uses standard input (VI ≥ 27.3 V) and output (CO ≥ 0.1 µF) capacitors per test circuits in DS0422. Dropout voltage remains constant at 2 V under 1 A load at 25 °C, independent of input voltage within specified range.

Key Specifications

Pinout & Package

Supplied in TO-220FP package-a full-packaged, insulated variant of TO-220 with integrated mounting flange and creepage-enhanced body for industrial safety compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output linear regulator applications.

Compared with LM7824CT, the L7824ABD2T offers tighter tolerance and wider temperature range for mission-critical systems; versus MC7824BD2TR4, it trades slightly higher thermal resistance for lower profile and through-hole assembly compatibility in legacy designs.

Availability

L7824ABD2T is available at Aetrix Electronics and suitable for industrial PLC power rails, automotive body control modules, test & measurement equipment, and factory automation sensors requiring stable component supply and long-term lifecycle support.

Supply support for L7824ABD2T 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The L78 series was developed specifically for cost-sensitive, high-reliability linear regulation in industrial control, instrumentation, and embedded power applications-emphasizing ruggedness, ease of use, and wide operating temperature coverage.

FAQ

What is the minimum input voltage required for stable 24 V output at full load?

The L7824ABD2T requires a minimum input voltage of 27.3 V to maintain regulated 24 V output at 1 A load and 25 °C junction temperature, based on its 2 V dropout specification. At higher temperatures or loads approaching 1.5 A, VI should be increased to 28–30 V to ensure margin against thermal derating and line sag.

Can this regulator be used without a heatsink?

Yes-for intermittent or light-load operation (<250 mA average). At 1 A continuous load, the TO-220FP package's R_thJC = 5 °C/W and R_thJA = 60 °C/W require a heatsink to limit junction temperature rise below 125 °C. Without heatsinking, power dissipation >1.5 W (e.g., VI = 30 V, VO = 24 V, IO = 1 A → P_D = 6 W) will trigger thermal shutdown.

Does the L7824ABD2T require input and output capacitors?

Yes-STMicroelectronics specifies a minimum 0.33 µF ceramic capacitor at the input and 0.1 µF ceramic capacitor at the output, placed as close as possible to the respective pins. These capacitors stabilize internal feedback and suppress high-frequency oscillation; omitting them risks instability or excessive output ripple under dynamic load.

How does the L7824ABD2T handle short-circuit conditions?

The device limits short-circuit current to 200 mA typical (I_SC) under DC conditions and withstands peak currents up to 2.2 A (I_SCP) for brief durations. Combined with thermal shutdown and SOA protection, it survives indefinite output shorts at room temperature without damage-automatically recovering once fault is removed and junction temperature falls below trip threshold.