STMicroelectronics L7806ABD2T-TR

Overview

L7806ABD2T-TR from STMicroelectronics is a three-terminal positive fixed-voltage linear regulator delivering 6 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-used for local regulation in industrial power supplies, embedded control modules, and automotive body electronics.

For engineers reviewing the L7806ABD2T-TR datasheet, L7806ABD2T-TR pinout, L7806ABD2T-TR application, or L7806ABD2T-TR equivalent, key selection criteria include guaranteed extended-temperature performance (–40 °C to +125 °C), 2 V dropout at 1 A, 65 dB supply voltage rejection at 120 Hz, 17 mΩ output resistance, and D²PAK package thermal resistance (R_thJC = 3 °C/W).

Technical Context

The L7806ABD2T-TR implements a monolithic PNP pass transistor architecture with internal current limiting, thermal shutdown, and safe operating area (SOA) protection-ensuring fault resilience without external components. Its feedback loop maintains regulation under load steps from 5 mA to 1.5 A and input variations from 8.6 V to 21 V.

Designed for fixed-output use, it requires only input (CI ≥ 0.33 µF) and output (CO ≥ 0.1 µF) capacitors for stability. The device's 2 V dropout enables operation with modest input headroom, while its –0.8 mV/°C output drift supports stable biasing in temperature-varying environments.

Key Specifications

Pinout & Package

Supplied in D²PAK (TO-263) surface-mount package with exposed thermal pad for enhanced heat dissipation. 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 LM7806CD2T and MC7806BD2TR4, the L7806ABD2T-TR uniquely combines ±2 % output accuracy, 65 dB PSRR, and –40 °C to +125 °C operation in a thermally optimized D²PAK-making it the only choice for precision, high-reliability 6 V regulation in harsh environments.

Availability

L7806ABD2T-TR is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, programmable logic controllers, and medical diagnostic sensor modules requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for L7806ABD2T-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 power management applications.

The L78 series is ST's flagship family of three-terminal positive linear regulators-engineered for robustness, ease of use, and broad applicability in local on-card regulation across automotive, industrial, and consumer systems.

FAQ

What is the minimum required input voltage for stable 6 V output at 1.5 A?

The L7806ABD2T-TR requires a minimum input voltage of 8.6 V to maintain regulation at 1.5 A load and 25 °C junction temperature, per Table 4 of DS0422. At higher temperatures or with reduced heatsinking, input should be ≥9.5 V to accommodate increased dropout and thermal derating.

Can this regulator be used without an input bypass capacitor?

No. A minimum 0.33 µF ceramic capacitor is mandatory between IN and GND, placed within 5 mm of the pins. Omission causes instability, oscillation, or failure to regulate-confirmed by Figure 4 application circuits and test conditions in DS0422 Rev 38.

How does thermal performance differ between D²PAK and TO-220 packages?

D²PAK (R_thJC = 3 °C/W) provides 60 % lower junction-to-case thermal resistance than TO-220 (R_thJC = 5 °C/W), enabling ~30 % higher continuous current in PCB-constrained layouts. This is critical for sustained 1.5 A operation without oversized heatsinks.

Is output voltage adjustable using external resistors?

No. The L7806ABD2T-TR is a fixed 6 V output device. While the base L78 architecture can be adapted for adjustable use via external feedback (per datasheet Section 7), this specific variant lacks the ADJ pin and internal resistor divider necessary for such configuration.