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

STMicroelectronics LD1086DT18TR

Name: LD1086DT18TR
Brand: STMicroelectronics
SKU: LD1086DT18TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD1086DT18TR

Manufacturer:: STMicroelectronics

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

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: LD1086DT18TR.pdf

Description:: IC REG LINEAR 1.8V 1.5A DPAK

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Product details

Overview

LD1086DT18TR from STMicroelectronics is a fixed-output 1.8 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, 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 LD1086DT18TR datasheet, LD1086DT18TR pinout, LD1086DT18TR application, or LD1086DT18TR equivalent, key selection criteria include dropout voltage at 1.5 A, output accuracy over -40 °C to 125 °C, quiescent current behavior under light load, and stability with 10 µF ceramic output capacitance.

Technical Context

The LD1086DT18TR uses a PNP-based pass transistor architecture with on-chip trimming for tight output voltage accuracy. Its reference voltage is internally set to 1.25 V, enabling fixed 1.8 V output via resistor-free configuration - eliminating external feedback networks and reducing BOM count.

Quiescent current flows entirely into the load rather than being wasted as bias current, improving efficiency at partial loads. Thermal shutdown activates at junction temperatures exceeding 160 °C, with automatic recovery after cooldown, supporting robust operation in enclosed industrial enclosures.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.8 V ±1% at 25 °C; maintains ±2% across -40 °C to 125 °C - ensures reliable logic-level compliance for 1.8 V I/O standards.
Max Output Current	1.5 A guaranteed - supports high-current digital loads such as ARM Cortex-M7 MCU cores or DDR3L termination supplies.
Dropout Voltage	1.3 V typical at 1.5 A - enables regulation from 3.1 V input (e.g., LiFePO₄ battery or buck-boost pre-regulator), minimizing power loss.
Quiescent Current	5–10 mA over VI ≤ 30 V - remains constant regardless of load, simplifying standby power budgeting in always-on systems.
Stability Capacitor	10 µF minimum ceramic output capacitor - eliminates need for tantalum or electrolytic, reducing footprint and improving reliability.
Operating Temp Range	-40 °C to +125 °C ambient - qualified for industrial motor drives, PLC modules, and automotive body control units (non-AEC-Q100).
Supply Rejection	60–82 dB at 120 Hz - suppresses ripple from upstream switching regulators, critical for noise-sensitive analog front-ends.

Pinout & Package

DPAK (TO-252) package: surface-mount, 3-pin, exposed thermal pad connected to output (pin 2). Requires minimum 25 mm² copper pour under pad for R_thJA = 33 °C/W performance.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (IN)	Input supply connection	Accepts 3.4 V to 30 V DC; must be decoupled with ≥1 µF ceramic near pin to prevent oscillation.
Pin 2 (OUT)	Regulated output & thermal pad	Delivers 1.8 V; thermal pad must be soldered to PCB ground plane or dedicated output copper for heat dissipation.
Pin 3 (GND)	Reference and return path	Low-impedance ground return for error amplifier; separate trace routing from power ground recommended.

Key Features

Feature	Design Value
Pin-to-pin compatibility	Replaces legacy adjustable LDOs (e.g., LM317) without layout change - reduces redesign effort in legacy upgrades.
Load-dependent quiescent current	Quiescent current flows into load - avoids wasted bias current, increasing efficiency by up to 5% at 100 mA load vs. PNP competitors.
Tight initial tolerance	±1% output at 25 °C - eliminates need for post-production calibration in precision measurement subsystems.
Short-circuit protection	Current-limited to 1.5–2.3 A depending on dropout - sustains fault condition without latch-up, enabling safe auto-recovery.
Thermal shutdown hysteresis	Triggers at ~160 °C, resets at ~140 °C - prevents thermal cycling damage during sustained overload in sealed enclosures.

Applications

Industrial PLC I/O Module

Automotive Body Control Unit

Use Scenario: Powering isolated CAN transceiver bias rails and digital isolator side supplies in DIN-rail mounted PLC backplanes.

IC Role / Device Role / Timing Role: Primary 1.8 V LDO for RS-485/CAN PHY interface ICs requiring clean, low-noise supply independent of main 5 V rail.

Use Value: 1.3 V dropout allows direct regulation from 3.3 V intermediate rail, avoiding cascaded inefficiency while maintaining ±2% output stability over temperature.

Use Scenario: Supplying 1.8 V logic for door module MCUs and LIN transceivers in non-safety-critical automotive zones.

IC Role / Device Role / Timing Role: Fixed-output LDO delivering regulated power to microcontroller I/O banks and EEPROM interfaces.

Use Value: -40 °C to +125 °C operation meets extended temperature requirements for under-hood and cabin modules without derating.

Medical Sensor Signal Chain

Edge AI Accelerator Board

Use Scenario: Biasing precision ADC drivers and low-noise op-amps in portable ECG/EEG front-end modules.

IC Role / Device Role / Timing Role: Low-noise 1.8 V supply for analog signal conditioning stages preceding digitization.

Use Value: 0.003% RMS output noise and 82 dB PSRR suppress switching noise from adjacent DC-DC converters, preserving SNR > 90 dB.

Use Scenario: Providing core voltage to low-power NPU accelerators (e.g., GAP8, Kendryte K210) in battery-powered edge inference nodes.

IC Role / Device Role / Timing Role: Secondary LDO generating 1.8 V I/O supply synchronized with main 3.3 V rail sequencing.

Use Value: 10 µF ceramic stability enables compact layout with no electrolytic components - critical for space-constrained wearable form factors.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV1117-18CDCYR	1.8 V fixed, 800 mA max, 1.2 V dropout at 800 mA, SOT-223 package	Limited to lower current; lacks thermal pad for high-power dissipation	Select when board space is constrained and load < 800 mA; avoid for continuous 1.5 A operation.
MCP1703T-1802E/MB	1.8 V fixed, 250 mA max, 600 mV dropout at 250 mA, SOT-89 package	Lower current rating and smaller thermal mass; not suitable for >300 mA sustained loads	Use only for ultra-low-power peripherals (e.g., RTC, sensors); insufficient for MCU core logic rails.

Compared with TLV1117-18CDCYR and MCP1703T-1802E/MB, the LD1086DT18TR uniquely supports 1.5 A continuous output with DPAK thermal performance and ±1% accuracy - making it the only viable choice for high-current 1.8 V rails where dropout and precision are simultaneously critical.

Availability

LD1086DT18TR is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and edge AI hardware requiring stable component supply, long-term manufacturability, and consistent parametric performance across production batches.

Supply support for LD1086DT18TR 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 analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The LD1086 series belongs to ST's high-current LDO portfolio, engineered specifically for industrial power management where reliability, thermal robustness, and tight output tolerance are mandatory in harsh environments.

FAQ

What is the minimum input voltage required for stable 1.8 V output at 1.5 A?

The LD1086DT18TR requires a minimum input voltage of 3.1 V to maintain regulation at 1.5 A, based on its 1.3 V typical dropout voltage. At higher temperatures or lower currents, dropout decreases - allowing operation down to 3.0 V in some conditions. Input must remain ≥3.4 V per absolute maximum ratings to ensure long-term reliability.

Can the LD1086DT18TR be used with ceramic output capacitors only?

Yes - the device is stable with ≥10 µF X7R/X5R ceramic capacitors and does not require ESR damping. This eliminates electrolytic or tantalum components, reducing size, cost, and failure risk. A 1 µF ceramic input capacitor placed within 5 mm of the IN pin is also recommended for transient immunity.

Does the DPAK thermal pad need to be electrically connected?

Yes - the exposed thermal pad on the LD1086DT18TR DPAK package is internally connected to the output (pin 2). It must be soldered to a PCB copper area tied to the 1.8 V output net to achieve specified thermal resistance (R_thJA = 33 °C/W). Floating or grounding the pad causes thermal runaway and device failure.

How does quiescent current behave under no-load conditions?

Quiescent current remains constant at 5–10 mA regardless of output load, including no-load. Unlike many LDOs, this current flows into the output rather than being sunk to ground - meaning it contributes directly to system load current, improving light-load efficiency and simplifying standby power analysis.

LD1086DT18TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

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:: DPAK

LD1086DT18TR FAQ

1.How can I place an order for LD1086DT18TR through Aetrix?

Please submit a Request for Quotation (RFQ) for LD1086DT18TR 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 LD1086DT18TR reliable?

The price and inventory of LD1086DT18TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086DT18TR is usually 5 days.

3.What payment methods are accepted for LD1086DT18TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086DT18TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD1086DT18TR?

LD1086DT18TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD1086DT18TR 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 LD1086DT18TR?

For technical support, including LD1086DT18TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086DT18TR requirements.

6.How does Aetrix verify that LD1086DT18TR is sourced from the original manufacturer or authorized distributors?

All LD1086DT18TR 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 LD1086DT18TR meets industry standards.

7.What is the process for return or replacement of LD1086DT18TR?

All LD1086DT18TR units undergo pre-shipment inspection (PSI). If there is an issue with LD1086DT18TR, 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 LD1086DT18TR part is unused and in its original packaging.

Return procedure for LD1086DT18TR:

1.Submit a request within 90 days.

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

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