STMicroelectronics LD1086D2T50

Overview

LD1086D2T50 from STMicroelectronics is a fixed-output 5.0 V, 1.5 A low-dropout linear voltage regulator in D²PAK package, featuring ±1% output tolerance at 25 °C, 1.3 V typical dropout at full load, and internal thermal/overcurrent protection. It delivers stable power to microcontroller cores, FPGA I/O banks, and industrial sensor signal chains where input-to-output differential is constrained.

For engineers reviewing the LD1086D2T50 datasheet, LD1086D2T50 pinout, LD1086D2T50 application, or LD1086D2T50 equivalent, key selection criteria include dropout voltage at 1.5 A, output tolerance over –40 °C to +125 °C, quiescent current behavior under varying load, stability with 10 µF output capacitance, and thermal resistance (R_thJC = 3 °C/W) for surface-mount thermal design.

Technical Context

The LD1086D2T50 uses a PNP-based pass transistor architecture with on-chip trimming for tight output regulation, enabling ±1% accuracy at 25 °C and ±2% across –40 °C to +125 °C. Its adjust pin (for adjustable variants) is internally tied to GND in fixed versions, eliminating external resistor networks.

Unlike traditional PNP regulators, its quiescent current flows into the load rather than being wasted-improving efficiency at light loads. The device requires only a 10 µF minimum ceramic or tantalum output capacitor for stability and supports input voltages up to 30 V DC.

Key Specifications

Pinout & Package

LD1086D2T50 is housed in a D²PAK (SMD 2L STD-ST) thermally enhanced surface-mount package with exposed tab electrically connected to OUTPUT. The package provides low R_thJC (3 °C/W) and supports high-current PCB layouts using thermal vias and copper flooding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LD1086D2T50, LD1086DTTR offers identical performance in automated production formats, while TLV1117-50CDR trades current capability and thermal robustness for smaller footprint-making it viable only in derated, space-constrained designs.

Availability

LD1086D2T50 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical sensor systems requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for LD1086D2T50 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 analog ICs.

The LD1086 series was designed for industrial and automotive power regulation applications demanding high current, low dropout, and wide temperature operation-targeting systems where reliability under thermal stress is critical.

FAQ

What is the minimum input voltage required for LD1086D2T50 to maintain 5.0 V output at 1.5 A?

The minimum input voltage is 6.3 V, calculated as V_OUT + V_DO(max) = 5.0 V + 1.5 V (guaranteed max dropout). At 1.3 V typical dropout, 6.3 V ensures margin for line and load regulation across temperature and process variation.

Can LD1086D2T50 be used with ceramic output capacitors?

Yes-STMicroelectronics specifies stability with ≥10 µF ceramic capacitors (X5R/X7R, 10 V rating). ESR is not required; low-ESR ceramics improve transient response and reduce board area versus tantalum solutions.

Is the exposed tab on the D²PAK package electrically isolated?

No-the tab is internally connected to the OUTPUT pin. It must be routed to the 5 V power plane or heatsink with appropriate insulation if mounting to a conductive chassis; shorting the tab to GND will destroy the device.

Does LD1086D2T50 require an input bypass capacitor?

Yes-a minimum 1 µF ceramic capacitor placed within 5 mm of the IN pin is required to suppress high-frequency noise and prevent oscillation during line transients, per ST's layout guidelines in Figure 3 and Section 4 of the datasheet.