STMicroelectronics L7805ABD2T-TR

Overview

L7805ABD2T-TR from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed 5 V output with up to 1.5 A load current, ±2 % output voltage tolerance at 25 °C, thermal overload and short-circuit protection, and operation across –40 °C to +125 °C junction temperature - used for local regulation in industrial power supplies and embedded control modules.

For engineers reviewing the L7805ABD2T-TR datasheet, L7805ABD2T-TR pinout, L7805ABD2T-TR application, or L7805ABD2T-TR equivalent, key selection criteria include guaranteed extended-temperature operation (–40 to +125 °C), dropout voltage of 2 V at 1 A, 68 dB supply voltage rejection at 120 Hz, 10 µV/√Hz output noise, and D²PAK package thermal resistance (R_thJC = 3 °C/W).

Technical Context

This IC implements a monolithic series pass regulator architecture with internal current limiting, thermal shutdown, and safe operating area (SOA) protection. It requires no external components for basic operation but supports adjustable output via external resistors when configured as a floating regulator.

Designed for fixed-voltage local regulation, it maintains stable 5 V output under line variations (VI = 7.5–18 V) and load changes (IO = 5 mA–1.5 A), with load regulation ≤100 mV and line regulation ≤50 mV under specified conditions.

Key Specifications

Pinout & Package

Supplied in D²PAK (TO-263) surface-mount package with exposed thermal pad for enhanced heat dissipation; R_thJC = 3 °C/W enables >1 A operation with minimal PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM7805CD2T and MC7805BD2TG, the L7805ABD2T-TR provides superior thermal performance (R_thJC = 3 °C/W), tighter line/load regulation (≤50 mV), and higher supply rejection (68 dB), making it optimal for thermally constrained or noise-critical designs.

Availability

L7805ABD2T-TR is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical front-ends, and point-of-sale terminals requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for L7805ABD2T-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 silicon solutions for automotive, industrial, and consumer markets.

The L78 series belongs to ST's legacy positive voltage regulator IC product line, engineered for robust, low-cost, fixed-output local regulation in space- and reliability-constrained embedded systems.

FAQ

What is the minimum input voltage required for regulation with L7805ABD2T-TR?

The minimum input voltage is 7.5 V under nominal load (IO = 1 A) and 25 °C, based on its 2 V dropout specification. At higher temperatures or full 1.5 A load, design margin increases this to ≥8 V to ensure regulation across the full –40 °C to +125 °C range.

Can L7805ABD2T-TR be used in parallel for higher current?

No - the L7805ABD2T-TR lacks built-in current-sharing features. Parallel operation risks thermal runaway due to mismatched output voltages and thermal coefficients. For >1.5 A, use a single higher-current regulator or switch-mode solution instead.

Is an input bypass capacitor mandatory?

Yes - a minimum 0.33 µF ceramic capacitor placed within 1 cm of the IN pin is required to prevent oscillation and ensure stability, especially with long input traces or high-impedance sources. Larger values (e.g., 10 µF tantalum) improve transient response.

Does L7805ABD2T-TR require a heat sink in D²PAK package?

A heat sink is not mandatory below ~0.8 A at 25 °C ambient, but becomes essential above 1 A or in elevated ambient temperatures. With R_thJC = 3 °C/W and R_thCA ≈ 40 °C/W (standard 2-layer PCB), junction temperature exceeds 125 °C at 1.3 A without supplemental cooling.