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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics LD1086D2T18TR

Name: LD1086D2T18TR
Brand: STMicroelectronics
SKU: LD1086D2T18TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD1086D2T18TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: LD1086D2T18TR.pdf

Description:: IC REG LINEAR 1.8V 1.5A D2PAK

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Inventory:1,279

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Product details

Overview

LD1086D2T18TR from STMicroelectronics is a fixed-output 1.8 V, 1.5 A low-dropout linear voltage regulator in D²PAK package, designed for high-current post-regulation in industrial power supplies and embedded systems. It delivers ±1% output tolerance at 25 °C, 1.3 V typical dropout at full load, and operates across –40 °C to +125 °C ambient temperature.

For engineers reviewing the LD1086D2T18TR datasheet, LD1086D2T18TR pinout, LD1086D2T18TR application, or LD1086D2T18TR equivalent, key selection criteria include dropout voltage under 1.5 A load, thermal performance in D²PAK, output stability with 10 µF output capacitance, and compatibility with legacy adjustable regulator footprints.

Technical Context

The LD1086D2T18TR integrates an internal bandgap reference (1.25 V), error amplifier, and NPN pass transistor - enabling fixed 1.8 V output without external resistors. Its quiescent current flows into the load rather than ground, improving efficiency versus PNP-based regulators.

Thermal protection activates at junction temperatures exceeding 150 °C, and internal current limiting ensures safe short-circuit operation. The device requires only a 10 µF minimum ceramic or tantalum output capacitor for stability and exhibits 60–82 dB supply voltage rejection at 120 Hz.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.8 V ±1% at 25 °C; ±2% over –40 °C to +125 °C - enables precise logic rail regulation for 1.8 V microcontrollers and FPGAs.
Max Output Current	1.5 A guaranteed - supports high-current digital loads such as SoCs and DDR memory termination without derating at 85 °C ambient.
Dropout Voltage	1.3 V typical at 1.5 A - allows operation from 3.1 V input to deliver stable 1.8 V, ideal for battery-backed or multi-rail systems.
Quiescent Current	5–10 mA - remains constant across load and input voltage, minimizing no-load power loss in always-on subsystems.
Operating Temp Range	–40 °C to +125 °C junction - qualified for industrial control, motor drives, and automotive under-hood auxiliary rails.
Stability Capacitor	10 µF minimum CO - compatible with low-ESR ceramic capacitors; no ESR requirements simplify BOM and layout.
Supply Rejection	60–82 dB at 120 Hz - suppresses ripple from upstream switching converters, reducing need for additional filtering stages.

Pinout & Package

D²PAK (TO-263-3) package: thermally enhanced surface-mount variant with exposed tab electrically connected to OUTPUT pin; suitable for high-power dissipation on PCB copper planes.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 3.4 V to 30 V DC; must be decoupled with ≥1 µF near pin to prevent instability during line transients.
2 (OUTPUT)	Regulated output and thermal pad connection	Delivers 1.8 V; tab is electrically tied to this pin - requires solid thermal via array to inner ground/power plane for <3 °C/W θ_JA.
3 (GND)	Reference and feedback ground	Low-impedance return path for error amplifier; must be routed separately from power ground to avoid noise coupling into regulation loop.

Key Features

Feature	Design Value
Pin-to-pin compatible with legacy adjustable regulators	Enables drop-in replacement of LM317/LD1085 in existing layouts without footprint or schematic changes.
Internal trimming for ±1% accuracy	Eliminates need for external calibration or resistor matching, reducing test time and field drift in long-life equipment.
Load-connected quiescent current	Improves system efficiency by >10% vs. PNP regulators at light loads - critical for battery-powered edge nodes.
Thermal and current limiting	Self-protecting operation prevents damage during overload or poor heatsinking; automatic recovery after fault removal.
Wide package options including DFN8	D²PAK variant balances thermal performance and manufacturability; DFN8 option supports ultra-compact designs with 4×4 mm footprint.

Applications

Industrial PLC I/O Modules

Automotive Body Control Units

Use Scenario: Powering isolated 1.8 V digital logic in DIN-rail mounted programmable logic controllers with wide input voltage range (12–24 V DC).

IC Role / Device Role / Timing Role: Primary post-regulator converting switched 3.3 V or 5 V intermediate rail to clean 1.8 V core supply for ARM Cortex-M7 microcontrollers.

Use Value: 1.3 V dropout enables regulation from 3.1 V input, preserving headroom when upstream DC/DC efficiency drops under partial load.

Use Scenario: Supplying 1.8 V to CAN transceiver interfaces and LIN bus controllers in vehicle door modules operating from 9–16 V battery.

IC Role / Device Role / Timing Role: Fixed-voltage LDO providing low-noise, ripple-free power to communication PHY layers sensitive to supply-induced jitter.

Use Value: 82 dB PSRR at 120 Hz rejects alternator ripple, preventing bit errors in CAN FD frames during engine cranking.

Medical Diagnostic Imaging Sensors

5G Small Cell Baseband Processors

Use Scenario: Biasing high-resolution ADC front-ends and low-noise amplifiers in portable ultrasound probe electronics.

IC Role / Device Role / Timing Role: Ultra-stable analog rail generator where ±1% output tolerance and 0.003% RMS noise ensure <1 LSB INL error at 16-bit resolution.

Use Value: Internal bandgap reference and trimmed error amplifier eliminate need for external precision references, reducing component count and board area.

Use Scenario: Delivering 1.8 V core voltage to FPGA-based baseband processors in outdoor small cell radios with ambient temperature up to 85 °C.

IC Role / Device Role / Timing Role: High-current, thermally robust LDO supporting dynamic load steps up to 1.5 A with <100 mV transient deviation.

Use Value: D²PAK thermal resistance (R_thJC = 3 °C/W) enables 1.5 A continuous operation without external heatsink in sealed enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LD1086V18TR	Same silicon die, TO-220 package with insulated tab; R_thJA = 50 °C/W vs. 62.5 °C/W for D²PAK	Better suited for through-hole prototyping or low-volume assemblies with manual soldering	Select when mechanical mounting constraints favor vertical heatsink attachment or legacy board compatibility is required.
TSM1086-1.8	1.5 A rating, but ±2% output tolerance at 25 °C and higher 1.5 V typical dropout at 1.5 A	Lower accuracy and higher dropout limit use in cost-sensitive consumer applications, not precision industrial systems	Choose only if budget constraints outweigh need for tight regulation and thermal margin in high-ambient environments.

Compared with LD1086D2T18TR, LD1086V18TR trades surface-mount scalability for easier thermal management in low-volume builds, while TSM1086-1.8 sacrifices 1% tolerance and 0.2 V dropout margin to reduce unit cost - making the D²PAK variant optimal for production-grade industrial and automotive power rails.

Availability

LD1086D2T18TR is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical imaging sensors, and 5G small cell baseband processors requiring stable component supply with full lifecycle support.

Supply support for LD1086D2T18TR 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, specializing in power management, microcontrollers, and automotive ICs with ISO/TS 16949-certified manufacturing.

The LD1086 series was developed to replace aging PNP-based LDOs with higher efficiency, tighter tolerance, and broader thermal capability - targeting industrial automation, transportation, and medical equipment where reliability and long-term supply stability are critical.

FAQ

Is LD1086D2T18TR pin-compatible with LM317-based circuits?

Yes - LD1086D2T18TR uses the same IN-GND-OUT pinout as LM317 in D²PAK, but functions as a fixed 1.8 V regulator. No external resistors are needed, and the GND pin serves only as reference, not adjustment. Layout reuse is possible, though input/output capacitor values may differ due to lower ESR requirements.

What is the minimum output capacitance required for stability?

The LD1086D2T18TR requires a minimum 10 µF output capacitor with ≤100 mΩ ESR. Ceramic, tantalum, or polymer capacitors meet this requirement. Unlike older LDOs, it has no minimum ESR specification, enabling use of low-ESR MLCCs that reduce board space and cost without risking oscillation.

Can LD1086D2T18TR be used in automotive applications?

The standard LD1086D2T18TR is rated for industrial temperature range (–40 °C to +125 °C), but is not AEC-Q100 qualified. For automotive use, ST offers the automotive-grade LD1086DTTRY variant - identical electrical specs with extended qualification for body electronics, including vibration, humidity, and lifetime testing per AEC standards.

How does thermal performance compare between D²PAK and DFN8 packages?

D²PAK offers R_thJC = 3 °C/W and R_thJA ≈ 62.5 °C/W with 2 oz copper and 4 thermal vias; DFN8 achieves R_thJC = 1.5 °C/W but R_thJA ≈ 100 °C/W in standard layouts. D²PAK delivers superior power handling in compact spaces, while DFN8 suits ultra-thin designs where board-level thermal spreading is limited.

LD1086D2T18TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 30V

Voltage - Output (Min/Fixed):: 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.5V @ 1.5A

Current - Output:: 1.5A

Current - Quiescent (Iq):: 10 mA

Current - Supply (Max):: -

PSRR:: 82dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

LD1086D2T18TR FAQ

1.How can I place an order for LD1086D2T18TR through Aetrix?

Please submit a Request for Quotation (RFQ) for LD1086D2T18TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LD1086D2T18TR reliable?

The price and inventory of LD1086D2T18TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086D2T18TR is usually 5 days.

3.What payment methods are accepted for LD1086D2T18TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086D2T18TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD1086D2T18TR?

LD1086D2T18TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD1086D2T18TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LD1086D2T18TR?

For technical support, including LD1086D2T18TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086D2T18TR requirements.

6.How does Aetrix verify that LD1086D2T18TR is sourced from the original manufacturer or authorized distributors?

All LD1086D2T18TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LD1086D2T18TR meets industry standards.

7.What is the process for return or replacement of LD1086D2T18TR?

All LD1086D2T18TR units undergo pre-shipment inspection (PSI). If there is an issue with LD1086D2T18TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LD1086D2T18TR part is unused and in its original packaging.

Return procedure for LD1086D2T18TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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