STMicroelectronics L7805ABD2T

Overview

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

For engineers reviewing the L7805ABD2T datasheet, L7805ABD2T pinout, L7805ABD2T application, or L7805ABD2T equivalent, key selection criteria include guaranteed extended-temperature performance, dropout voltage of 2 V at 1 A, load regulation ≤100 mV (5 mA–1.5 A), supply voltage rejection of 68 dB at 120 Hz, and D²PAK package thermal resistance (R_thJC = 3 °C/W).

Technical Context

This IC implements a monolithic series-pass linear regulator architecture with internal current limiting, safe operating area (SOA) protection, and thermal shutdown circuitry-ensuring robustness under sustained overload or ambient temperature extremes. 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 accepts input voltages up to 35 V (for 5 V output) and maintains regulation with minimum 5 mA load current. Its low quiescent current (4.3–6 mA) and 10 µV/√Hz output noise support stable analog subsystems in mixed-signal environments.

Key Specifications

Pinout & Package

The L7805ABD2T is housed in a surface-mount D²PAK (TO-263) package with standard three-terminal configuration: Input (Pin 1), Ground (Pin 2), Output (Pin 3). This thermally enhanced package enables higher power dissipation than TO-220FP while maintaining PCB footprint efficiency.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM7805CD2T and MC7805BD2TR4, the L7805ABD2T uniquely combines extended-temperature guarantee, lowest thermal resistance (3 °C/W), and tightest production tolerance across full operating range-making it optimal for thermally constrained industrial and automotive applications demanding long-term regulation stability.

Availability

L7805ABD2T is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical diagnostic instruments, and point-of-sale terminals requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for L7805ABD2T 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The L78 series is ST's flagship family of three-terminal positive linear regulators-designed specifically for robust local regulation in harsh environments where reliability, thermal resilience, and protection integrity are non-negotiable.

FAQ

What is the minimum input voltage required for stable 5 V output at 1.5 A?

The L7805ABD2T requires a minimum input voltage of 7.5 V to maintain regulation at full 1.5 A load and 25 °C junction temperature. At higher temperatures or with reduced heatsinking, VI should be ≥8.5 V to ensure dropout margin-due to its 2 V dropout specification and thermal derating effects on current limit.

Can this regulator be used without input and output capacitors?

No. The datasheet mandates a 0.33 µF input capacitor (close to Pin 1) and a 0.1 µF output capacitor (close to Pin 3) for stability across all operating conditions. Omitting either risks oscillation, poor transient response, or failure to reject input ripple-especially critical at 120 Hz line-frequency harmonics.

How does thermal protection behave during sustained overload?

Under sustained overload, the L7805ABD2T activates thermal shutdown at ~165 °C junction temperature, disabling output until die cools by ~10–15 °C. It then auto-restarts-cycling on/off if fault persists. This hiccup-mode behavior prevents permanent damage but requires system-level monitoring to avoid repeated cycling in safety-critical applications.

Is the D²PAK package lead-free and RoHS-compliant?

Yes. The L7805ABD2T D²PAK package is manufactured per STMicroelectronics' standard RoHS-compliant process, with lead-free terminations and halogen-free molding compound. It meets JEDEC J-STD-020 moisture sensitivity level MSL3 and supports standard Pb-free reflow profiles (peak 260 °C).