STMicroelectronics L7824CD2T-TR

Overview

L7824CD2T-TR from STMicroelectronics is a three-terminal positive fixed-voltage linear regulator delivering 24 V at up to 1.5 A output current, featuring thermal overload protection, short-circuit protection, and safe operating area (SOA) protection. It operates with input voltages up to 40 V, maintains ±2 % output voltage tolerance over temperature, and is housed in a D²PAK surface-mount package for high-power industrial power supplies.

For engineers reviewing the L7824CD2T-TR datasheet, L7824CD2T-TR pinout, L7824CD2T-TR application, or L7824CD2T-TR equivalent, key selection criteria include dropout voltage (2 V @ 1 A), load regulation (≤100 mV), supply voltage rejection (54 dB @ 120 Hz), and extended temperature operation (−40 °C to 125 °C junction).

Technical Context

This device implements a monolithic series-pass linear regulation architecture with internal current limiting, thermal shutdown, and SOA protection-enabling robust local regulation without external protection circuitry. Its fixed 24 V output eliminates need for feedback resistor networks, simplifying design in point-of-load applications.

Designed for stable DC output under varying line and load conditions, it specifies load regulation ≤100 mV across 5 mA–1.5 A and line regulation ≤240 mV over VI = 27–38 V, with quiescent current of 4.6–6 mA and output resistance of 20 mΩ at 1 kHz.

Key Specifications

Pinout & Package

The L7824CD2T-TR is supplied in a D²PAK (TO-263) surface-mount package with exposed thermal pad for enhanced heat dissipation. Pin 1 is Input, Pin 2 is Ground, Pin 3 is Output.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM7824CD2T and MC7824CD2TG, the L7824CD2T-TR provides guaranteed −40 °C start-up, tighter 2 % output tolerance, integrated SOA protection, and superior 54 dB supply ripple rejection - making it the preferred choice for mission-critical 24 V regulation where thermal resilience and precision matter.

Availability

L7824CD2T-TR is available at Aetrix Electronics and suitable for industrial PLCs, 24 V fieldbus nodes, motor drive auxiliary supplies, and automated test equipment requiring stable component supply across long production lifecycles.

Supply support for L7824CD2T-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 analog products for industrial, automotive, and consumer markets.

The L78 series belongs to ST's legacy positive voltage regulator product line, engineered specifically for rugged, cost-effective local DC regulation in harsh environments where reliability and simplicity are prioritized over ultra-low quiescent current or switching efficiency.

FAQ

What is the minimum input voltage required for stable 24 V output at 1.5 A?

The L7824CD2T-TR requires a minimum input voltage of 26 V to maintain regulation at 1.5 A, based on its 2 V dropout specification. For reliable operation across temperature and line variations, ST recommends ≥27.3 V input under full load per datasheet Table 9. Lower inputs cause output collapse or thermal shutdown.

Can this regulator be used without a heatsink?

At ≤500 mA load with ambient ≤40 °C and adequate PCB copper (≥25 cm² 2 oz Cu thermal pad), the D²PAK package may operate without an external heatsink. Above that, thermal resistance (R_thJA = 62.5 °C/W) necessitates heatsinking to keep junction temperature below 125 °C - e.g., 10 °C/W heatsink required for 1.5 A at 60 °C ambient.

Does L7824CD2T-TR require input and output capacitors?

Yes: a minimum 0.33 µF ceramic capacitor is required at the input pin, and a minimum 0.1 µF ceramic capacitor at the output pin, placed as close as possible to the device. These stabilize internal feedback and prevent oscillation; omitting them risks instability or thermal runaway under dynamic load conditions.

How does the L7824CD2T-TR behave during short-circuit events?

Under short-circuit, the device limits output current to ~0.2 A (I_sc) and activates thermal shutdown if junction temperature exceeds ~160 °C. After fault removal, it auto-recovers once cooled below thermal trip threshold. Peak short-circuit current reaches 2.2 A briefly before limiting engages, per datasheet Iscp specification.