STMicroelectronics LD1086DT80TR

Overview

LD1086DT80TR from STMicroelectronics is a fixed-output 5 V, 1.5 A low-dropout linear voltage regulator in DPAK package, featuring ±1% output tolerance at 25 °C, 1.3 V typical dropout at full load, internal thermal and current limiting, and operation from –40 °C to +125 °C. It powers microcontroller core rails, industrial sensor interfaces, and embedded power supplies where stable low-noise DC is critical.

For engineers reviewing the LD1086DT80TR datasheet, LD1086DT80TR pinout, LD1086DT80TR application, or LD1086DT80TR equivalent, key selection factors include dropout voltage at 1.5 A, output tolerance across temperature, quiescent current behavior under varying load, and compatibility with minimal 10 µF output capacitance for stability.

Technical Context

The LD1086DT80TR implements an NPN-based LDO architecture with on-chip trimmed bandgap reference (1.25 V), enabling tight ±1% initial output accuracy and <0.5% temperature drift. Its adjust pin (for adjustable variants) is repurposed as ground in fixed versions like DT80TR, simplifying PCB layout and eliminating external resistor networks.

Unlike PNP-type regulators, it routes quiescent current into the load rather than sinking it externally-improving efficiency by up to 10% at light loads. Dropout remains stable below 1.5 V across –40 °C to +125 °C, supported by integrated thermal shutdown that activates at ~160 °C junction temperature.

Key Specifications

Pinout & Package

LD1086DT80TR uses the DPAK (TO-252) surface-mount package with exposed thermal pad. The tab is electrically connected to the OUTPUT pin, requiring appropriate thermal viaing and isolation from ground planes unless output-referenced heatsinking is intended.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV1117-50CDCYR and LD1117DT50TR, the LD1086DT80TR delivers 87.5% higher output current in identical DPAK footprint while maintaining comparable dropout and thermal resistance - making it optimal for next-generation industrial controllers requiring single-rail 5 V/1.5 A delivery.

Availability

LD1086DT80TR is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical diagnostics equipment requiring stable component supply with long-term manufacturability and AEC-Q100-aligned reliability.

Supply support for LD1086DT80TR 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 LD1086 series belongs to ST's high-current LDO portfolio, engineered specifically for robust, thermally efficient regulation in harsh-environment embedded systems where reliability and parametric consistency are non-negotiable.

FAQ

What is the minimum input voltage required for LD1086DT80TR to maintain 5 V output at 1.5 A?

The LD1086DT80TR requires a minimum input voltage of 6.3 V to sustain 5 V output at 1.5 A load, based on its guaranteed 1.5 V maximum dropout voltage across temperature and process variation. At room temperature, typical dropout is 1.3 V, allowing operation from 6.3 V - sufficient for 7.2 V nominal battery systems during discharge.

Can LD1086DT80TR be used with ceramic output capacitors?

Yes - the LD1086DT80TR is stable with ceramic output capacitors ≥10 µF and ESR ≥5 mΩ. Unlike older LDOs, it does not require high-ESR tantalum or aluminum electrolytics; X7R/X5R 1206 or 0805 ceramics are fully compatible and recommended for size and reliability.

Does LD1086DT80TR include reverse polarity protection?

No - the LD1086DT80TR lacks internal reverse-voltage protection. Applying reverse input voltage (e.g., –0.3 V on IN relative to GND) may cause latch-up or permanent damage. An external series Schottky diode (e.g., 1N5819) is required if reverse input conditions are possible in the system.

How does the thermal pad connection affect PCB layout for LD1086DT80TR?

The DPAK thermal pad is electrically tied to the OUTPUT pin. It must be connected directly to the 5 V output copper pour using ≥4 thermal vias (0.3 mm diameter) to inner ground or power planes. Isolating the pad or connecting it to GND creates a short circuit - verified in ST's AN4100 layout guidelines.