STMicroelectronics L7815ABV

Overview

L7815ABV from STMicroelectronics is a three-terminal positive linear voltage regulator delivering a fixed +15 V output with up to 1.5 A continuous current, thermal overload protection, short-circuit protection, and output transition 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 supply rails, embedded control subsystems, and analog sensor biasing in harsh environments.

For engineers reviewing the L7815ABV datasheet, L7815ABV pinout, L7815ABV application, or L7815ABV equivalent, key selection considerations include dropout voltage (2 V at 1 A), load regulation (≤100 mV over 5 mA–1 A), supply voltage rejection (58 dB at 120 Hz), quiescent current (4.4–6 mA), and thermal resistance (R_thJC = 5 °C/W in TO-220 package).

Technical Context

The L7815ABV implements a monolithic bipolar linear regulator architecture with internal current limiting, thermal shutdown, and SOA protection-enabling robust operation without external protection circuitry. Its fixed +15 V output is stabilized via on-chip bandgap reference and error amplifier feedback loop.

Designed for local on-card regulation, it eliminates centralized supply distribution issues and supports both capacitive input (≥0.33 µF) and output (≥0.1 µF) filtering per ST's test circuits. Minimum load requirement is 5 mA for regulation stability.

Key Specifications

Pinout & Package

Supplied in TO-220 package (3-pin, vertical mounting, metal tab connected to ground), with pin 1 = Input, pin 2 = Ground, pin 3 = Output. The metal tab is electrically tied to Pin 2 (GND), enabling direct heatsink attachment without isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM7815CT, L7815ABV provides guaranteed operation down to –40 °C and tighter thermal resistance control in TO-220; versus MC7815BD2TR4, it offers lower quiescent current and through-hole mechanical robustness at the expense of slightly higher junction-to-ambient resistance.

Availability

L7815ABV is available at Aetrix Electronics and suitable for industrial power supply rails, automotive ECU subsystems, and analog sensor biasing requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for L7815ABV 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 belongs to ST's legacy positive voltage regulator product line, engineered for rugged, cost-effective local regulation in safety-critical and thermally demanding applications where simplicity and proven reliability are paramount.

FAQ

What is the minimum input voltage required for stable 15 V output at 1 A?

The L7815ABV requires a minimum input voltage of 17 V to maintain regulation at 1 A load, based on its 2 V dropout specification at 25 °C. At elevated temperatures or higher currents, derating is advised-designers should verify margin using R_thJA = 60 °C/W and ambient temperature constraints.

Can L7815ABV be used without an input bypass capacitor?

No. STMicroelectronics specifies a minimum 0.33 µF ceramic capacitor between input and ground, placed as close as possible to Pin 1. Omitting it risks instability, oscillation, or failure to reject high-frequency noise-especially when fed from long traces or switching supplies.

Does L7815ABV require a minimum load current to regulate properly?

Yes. A minimum load current of 5 mA is required to maintain regulation across all operating conditions. Applications with intermittent or zero-load states (e.g., sleep-mode microcontrollers) must include a bleeder resistor or active load to meet this requirement.

How does the thermal shutdown behavior affect system recovery?

When junction temperature exceeds ~165 °C, the L7815ABV disables output until temperature falls below ~145 °C (typical hysteresis). Recovery is automatic and does not require power cycling-enabling graceful fault handling in fanless enclosures or transient overload events.