STMicroelectronics L7805ABV-DG

Overview

L7805ABV-DG from STMicroelectronics is a three-terminal positive fixed-voltage linear regulator delivering 5 V ±2 % output with up to 1.5 A continuous current, thermal overload and short-circuit protection, and operation across –40 °C to +125 °C junction temperature. It serves as a local on-card power supply in industrial control modules, automotive body electronics, and embedded microcontroller power rails where stable low-noise 5 V is required.

For engineers reviewing the L7805ABV-DG datasheet, L7805ABV-DG pinout, L7805ABV-DG application, or L7805ABV-DG equivalent, key selection criteria include guaranteed extended-temperature performance (–40 °C to +125 °C), 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 TO-220FP package thermal resistance (R_thJC = 5 °C/W).

Technical Context

The L7805ABV-DG implements a monolithic series-pass linear regulator architecture with internal current limiting, thermal shutdown, and safe operating area (SOA) protection. Its feedback loop maintains regulated 5 V output independent of input variations from 7.5 V to 18 V under 1 A load, with line regulation specified down to 2 mV over narrow input ranges.

Designed for fixed-output use without external components, it supports optional adjustment via external resistors but requires minimum 5 mA load current for regulation stability. The device uses silicon-based bipolar process technology optimized for robustness in harsh environments, not for high-efficiency or ultra-low-quiescent applications.

Key Specifications

Pinout & Package

Supplied in TO-220FP package (3-pin, vertical mounting, isolated tab), featuring integrated thermal pad for direct heatsink attachment. Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM7805CDT/NOPB, L7805ABV-DG provides guaranteed –40 °C functionality and tighter tolerance across temperature; versus MC7805BDTRKG, it delivers superior thermal performance via isolated TO-220FP package - critical for sustained 1.5 A operation in enclosed enclosures.

Availability

L7805ABV-DG is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded microcontroller power supply applications requiring stable component supply, long-term lifecycle support, and extended-temperature qualification.

Supply support for L7805ABV-DG 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 automotive-grade ICs with ISO/TS 16949-certified manufacturing.

L7805ABV-DG belongs to the L78 positive voltage regulator family, engineered for ruggedized fixed-output local regulation in industrial, automotive, and consumer systems where reliability under thermal and electrical stress is mandatory.

FAQ

What is the minimum input voltage required for regulation?

The L7805ABV-DG requires a minimum input voltage of 7.5 V to maintain 5 V output at 1 A load, based on its 2 V dropout specification. At lighter loads (<100 mA), regulation holds down to ~7 V, but design margin should retain ≥7.5 V across temperature and line variation per datasheet Table 3.

Can this regulator be used without a heatsink?

Yes - at ≤500 mA output current and ambient temperatures ≤40 °C with free-air convection, the TO-220FP package can operate without an external heatsink. Above that, thermal calculations using R_thJA = 60 °C/W show junction temperature exceeds 125 °C; a heatsink is mandatory for 1 A continuous operation.

Does it require input and output capacitors?

Yes - STMicroelectronics specifies a minimum 0.33 µF ceramic capacitor on the input and 0.1 µF ceramic capacitor on the output, placed as close as possible to the pins. These prevent oscillation and improve transient response; omitting them risks instability or excessive output ripple under dynamic load changes.

Is the ground pin internally connected to the metal tab?

No - the TO-220FP package features electrically isolated tab (pin 2 is ground, but tab is insulated). This allows direct mounting to a common heatsink without shorting the ground node, unlike standard TO-220. Insulation must be verified before mechanical assembly to ensure no unintended tab-to-chassis contact.